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## Long short-term memory

"LSTM" redirects here. It is not to be confused with Log-structured merge-tree.

Artificial recurrent neural network architecture used in deep learning

The Long Short-Term Memory (LSTM) cell can process data sequentially and keep its hidden state through time.

Long short-term memory (LSTM) is an artificial recurrent neural network (RNN) architecture[1] used in the field of deep learning. Unlike standard feedforward neural networks, LSTM has feedback connections. It can process not only single data points (such as images), but also entire sequences of data (such as speech or video). For example, LSTM is applicable to tasks such as unsegmented, connected handwriting recognition,[2]speech recognition[3][4] and anomaly detection in network traffic or IDSs (intrusion detection systems).

A common LSTM unit is composed of a cell, an input gate, an output gate and a forget gate. The cell remembers values over arbitrary time intervals and the three gates regulate the flow of information into and out of the cell.

LSTM networks are well-suited to classifying, processing and making predictions based on time series data, since there can be lags of unknown duration between important events in a time series. LSTMs were developed to deal with the vanishing gradient problem that can be encountered when training traditional RNNs. Relative insensitivity to gap length is an advantage of LSTM over RNNs, hidden Markov models and other sequence learning methods in numerous applications.[citation needed]

### Idea

In theory, classic (or "vanilla") RNNs can keep track of arbitrary long-term dependencies in the input sequences. The problem with vanilla RNNs is computational (or practical) in nature: when training a vanilla RNN using back-propagation, the long-term gradients which are back-propagated can "vanish" (that is, they can tend to zero) or "explode" (that is, they can tend to infinity), because of the computations involved in the process, which use finite-precision numbers. RNNs using LSTM units partially solve the vanishing gradient problem, because LSTM units allow gradients to also flow unchanged. However, LSTM networks can still suffer from the exploding gradient problem.[5]

### Variants

In the equations below, the lowercase variables represent vectors. Matrices and contain, respectively, the weights of the input and recurrent connections, where the subscript can either be the input gate , output gate , the forget gate or the memory cell , depending on the activation being calculated. In this section, we are thus using a "vector notation". So, for example, is not just one unit of one LSTM cell, but contains LSTM cell's units.

### LSTM with a forget gate

The compact forms of the equations for the forward pass of an LSTM cell with a forget gate are:[1][6]

where the initial values are and and the operator denotes the Hadamard product (element-wise product). The subscript indexes the time step.

#### Variables

• : input vector to the LSTM unit
• : forget gate's activation vector
• : input/update gate's activation vector
• : output gate's activation vector
• : hidden state vector also known as output vector of the LSTM unit
• : cell input activation vector
• : cell state vector
• , and : weight matrices and bias vector parameters which need to be learned during training

where the superscripts and refer to the number of input features and number of hidden units, respectively.

### Peephole LSTM

A peephole LSTMunit with input (i.e. ), output (i.e. ), and forget (i.e. ) gates.

The figure on the right is a graphical representation of an LSTM unit with peephole connections (i.e. a peephole LSTM).[7][8] Peephole connections allow the gates to access the constant error carousel (CEC), whose activation is the cell state.[9] is not used, is used instead in most places.

Each of the gates can be thought as a "standard" neuron in a feed-forward (or multi-layer) neural network: that is, they compute an activation (using an activation function) of a weighted sum. and represent the activations of respectively the input, output and forget gates, at time step .

The 3 exit arrows from the memory cell to the 3 gates and represent the peephole connections. These peephole connections actually denote the contributions of the activation of the memory cell at time step , i.e. the contribution of (and not , as the picture may suggest). In other words, the gates and calculate their activations at time step (i.e., respectively, and ) also considering the activation of the memory cell at time step , i.e. .

The single left-to-right arrow exiting the memory cell is not a peephole connection and denotes .

The little circles containing a symbol represent an element-wise multiplication between its inputs. The big circles containing an S-like curve represent the application of a differentiable function (like the sigmoid function) to a weighted sum.

### Peephole convolutional LSTM

Peephole convolutional LSTM.[10] The denotes the convolution operator.

### Training

An RNN using LSTM units can be trained in a supervised fashion, on a set of training sequences, using an optimization algorithm, like gradient descent, combined with backpropagation through time to compute the gradients needed during the optimization process, in order to change each weight of the LSTM network in proportion to the derivative of the error (at the output layer of the LSTM network) with respect to corresponding weight.

A problem with using gradient descent for standard RNNs is that error gradients vanish exponentially quickly with the size of the time lag between important events. This is due to if the spectral radius of is smaller than 1.[11][12]

However, with LSTM units, when error values are back-propagated from the output layer, the error remains in the LSTM unit's cell. This "error carousel" continuously feeds error back to each of the LSTM unit's gates, until they learn to cut off the value.

### CTC score function

Many applications use stacks of LSTM RNNs[13] and train them by connectionist temporal classification (CTC)[14] to find an RNN weight matrix that maximizes the probability of the label sequences in a training set, given the corresponding input sequences. CTC achieves both alignment and recognition.

### Alternatives

Sometimes, it can be advantageous to train (parts of) an LSTM by neuroevolution[15] or by policy gradient methods, especially when there is no "teacher" (that is, training labels).

#### Success

There have been several successful stories of training, in a non-supervised fashion, RNNs with LSTM units.

In 2018, Bill Gates called it a “huge milestone in advancing artificial intelligence” when bots developed by OpenAI were able to beat humans in the game of Dota 2.[16] OpenAI Five consists of five independent but coordinated neural networks. Each network is trained by a policy gradient method without supervising teacher and contains a single-layer, 1024-unit Long-Short-Term-Memory that sees the current game state and emits actions through several possible action heads.[16]

In 2018, OpenAI also trained a similar LSTM by policy gradients to control a human-like robot hand that manipulates physical objects with unprecedented dexterity.[17]

In 2019, DeepMind's program AlphaStar used a deep LSTM core to excel at the complex video game Starcraft II.[18] This was viewed as significant progress towards Artificial General Intelligence.[18]

### Applications

Applications of LSTM include:

### Timeline of development

1995-1997: LSTM was proposed by Sepp Hochreiter and Jürgen Schmidhuber.[42][43][1] By introducing Constant Error Carousel (CEC) units, LSTM deals with the vanishing gradient problem. The initial version of LSTM block included cells, input and output gates.[44]

1999:Felix Gers and his advisor Jürgen Schmidhuber and Fred Cummins introduced the forget gate (also called “keep gate”) into LSTM architecture,[45] enabling the LSTM to reset its own state.[44]

2000: Gers & Schmidhuber & Cummins added peephole connections (connections from the cell to the gates) into the architecture.[6] Additionally, the output activation function was omitted.[44]

2009: An LSTM based model won the ICDAR connected handwriting recognition competition. Three such models were submitted by a team led by Alex Graves.[46] One was the most accurate model in the competition and another was the fastest.[47]

2013: LSTM networks were a major component of a network that achieved a record 17.7% phoneme error rate on the classic TIMIT natural speech dataset.[48]

2014: Kyunghyun Cho et al. put forward a simplified variant called Gated recurrent unit (GRU).[49]

2015: Google started using an LSTM for speech recognition on Google Voice.[50][51] According to the official blog post, the new model cut transcription errors by 49%. [52]

2016: Google started using an LSTM to suggest messages in the Allo conversation app.[53] In the same year, Google released the Google Neural Machine Translation system for Google Translate which used LSTMs to reduce translation errors by 60%.[54][55][56]

Apple announced in its Worldwide Developers Conference that it would start using the LSTM for quicktype[57][58][59] in the iPhone and for Siri.[60][61]

Amazon released Polly, which generates the voices behind Alexa, using a bidirectional LSTM for the text-to-speech technology.[62]

2017: Facebook performed some 4.5 billion automatic translations every day using long short-term memory networks.[63]

Researchers from Michigan State University, IBM Research, and Cornell University published a study in the Knowledge Discovery and Data Mining (KDD) conference.[64][65][66] Their study describes a novel neural network that performs better on certain data sets than the widely used long short-term memory neural network.

Microsoft reported reaching 94.9% recognition accuracy on the Switchboard corpus, incorporating a vocabulary of 165,000 words. The approach used "dialog session-based long-short-term memory".[67]

2019: Researchers from the University of Waterloo proposed a related RNN architecture which represents continuous windows of time. It was derived using the Legendre polynomials and outperforms the LSTM on some memory-related benchmarks.[68]

An LSTM model climbed to third place on the in Large Text Compression Benchmark.[69][70]

### References

1. ^ abcSepp Hochreiter; Jürgen Schmidhuber (1997). "Long short-term memory". Neural Computation. 9 (8): 1735–1780. doi:10.1162/neco.1997.9.8.1735. PMID 9377276. S2CID 1915014.
2. ^Graves, A.; Liwicki, M.; Fernandez, S.; Bertolami, R.; Bunke, H.; Schmidhuber, J. (2009). "A Novel Connectionist System for Improved Unconstrained Handwriting Recognition"(PDF). IEEE Transactions on Pattern Analysis and Machine Intelligence. 31 (5): 855–868. CiteSeerX 10.1.1.139.4502. doi:10.1109/tpami.2008.137. PMID 19299860. S2CID 14635907.
3. ^Sak, Hasim; Senior, Andrew; Beaufays, Francoise (2014). "Long Short-Term Memory recurrent neural network architectures for large scale acoustic modeling"(PDF). Archived from the original(PDF) on 2018-04-24.
4. ^Li, Xiangang; Wu, Xihong (2014-10-15). "Constructing Long Short-Term Memory based Deep Recurrent Neural Networks for Large Vocabulary Speech Recognition". arXiv:1410.4281 [cs.CL].
5. ^Calin, Ovidiu (14 February 2020). Deep Learning Architectures. Cham, Switzerland: Springer Nature. p. 555. ISBN .
6. ^ abFelix A. Gers; Jürgen Schmidhuber; Fred Cummins (2000). "Learning to Forget: Continual Prediction with LSTM". Neural Computation. 12 (10): 2451–2471. CiteSeerX 10.1.1.55.5709. doi:10.1162/089976600300015015. PMID 11032042. S2CID 11598600.
7. ^ abc
8. ^ abc
9. ^
10. ^Xingjian Shi; Zhourong Chen; Hao Wang; Dit-Yan Yeung; Wai-kin Wong; Wang-chun Woo (2015). "Convolutional LSTM Network: A Machine Learning Approach for Precipitation Nowcasting". Proceedings of the 28th International Conference on Neural Information Processing Systems: 802–810. arXiv:1506.04214. Bibcode:2015arXiv150604214S.
11. ^S. Hochreiter. Untersuchungen zu dynamischen neuronalen Netzen. Diploma thesis, Institut f. Informatik, Technische Univ. Munich, 1991.
12. ^Hochreiter, S.; Bengio, Y.; Frasconi, P.; Schmidhuber, J. (2001). "Gradient Flow in Recurrent Nets: the Difficulty of Learning Long-Term Dependencies (PDF Download Available)". In Kremer and, S. C.; Kolen, J. F. (eds.). A Field Guide to Dynamical Recurrent Neural Networks. IEEE Press.
13. ^Fernández, Santiago; Graves, Alex; Schmidhuber, Jürgen (2007). "Sequence labelling in structured domains with hierarchical recurrent neural networks". Proc. 20th Int. Joint Conf. On Artificial Intelligence, Ijcai 2007: 774–779. CiteSeerX 10.1.1.79.1887.
14. ^Graves, Alex; Fernández, Santiago; Gomez, Faustino (2006). "Connectionist temporal classification: Labelling unsegmented sequence data with recurrent neural networks". In Proceedings of the International Conference on Machine Learning, ICML 2006: 369–376. CiteSeerX 10.1.1.75.6306.
15. ^ abWierstra, Daan; Schmidhuber, J.; Gomez, F. J. (2005). "Evolino: Hybrid Neuroevolution/Optimal Linear Search for Sequence Learning". Proceedings of the 19th International Joint Conference on Artificial Intelligence (IJCAI), Edinburgh: 853–858.
16. ^ abRodriguez, Jesus (July 2, 2018). "The Science Behind OpenAI Five that just Produced One of the Greatest Breakthrough in the History of AI". Towards Data Science. Retrieved 2019-01-15.
17. ^"Learning Dexterity". OpenAI Blog. July 30, 2018. Retrieved 2019-01-15.
18. ^ abStanford, Stacy (January 25, 2019). "DeepMind's AI, AlphaStar Showcases Significant Progress Towards AGI". Medium ML Memoirs. Retrieved 2019-01-15.
19. ^Mayer, H.; Gomez, F.; Wierstra, D.; Nagy, I.; Knoll, A.; Schmidhuber, J. (October 2006). A System for Robotic Heart Surgery that Learns to Tie Knots Using Recurrent Neural Networks. 2006 IEEE/RSJ International Conference on Intelligent Robots and Systems. pp. 543–548. CiteSeerX 10.1.1.218.3399. doi:10.1109/IROS.2006.282190. ISBN . S2CID 12284900.
20. ^Graves, A.; Schmidhuber, J. (2005). "Framewise phoneme classification with bidirectional LSTM and other neural network architectures". Neural Networks. 18 (5–6): 602–610. CiteSeerX 10.1.1.331.5800. doi:10.1016/j.neunet.2005.06.042. PMID 16112549.
21. ^Fernández, Santiago; Graves, Alex; Schmidhuber, Jürgen (2007). An Application of Recurrent Neural Networks to Discriminative Keyword Spotting. Proceedings of the 17th International Conference on Artificial Neural Networks. ICANN'07. Berlin, Heidelberg: Springer-Verlag. pp. 220–229. ISBN .
22. ^Graves, Alex; Mohamed, Abdel-rahman; Hinton, Geoffrey (2013). "Speech Recognition with Deep Recurrent Neural Networks". Acoustics, Speech and Signal Processing (ICASSP), 2013 IEEE International Conference on: 6645–6649. arXiv:1303.5778. doi:10.1109/ICASSP.2013.6638947. ISBN . S2CID 206741496.
23. ^Eck, Douglas; Schmidhuber, Jürgen (2002-08-28). Learning the Long-Term Structure of the Blues. Artificial Neural Networks — ICANN 2002. Lecture Notes in Computer Science. 2415. Springer, Berlin, Heidelberg. pp. 284–289. CiteSeerX 10.1.1.116.3620. doi:10.1007/3-540-46084-5_47. ISBN .
24. ^Schmidhuber, J.; Gers, F.; Eck, D.; Schmidhuber, J.; Gers, F. (2002). "Learning nonregular languages: A comparison of simple recurrent networks and LSTM". Neural Computation. 14 (9): 2039–2041. CiteSeerX 10.1.1.11.7369. doi:10.1162/089976602320263980. PMID 12184841. S2CID 30459046.
25. ^Perez-Ortiz, J. A.; Gers, F. A.; Eck, D.; Schmidhuber, J. (2003). "Kalman filters improve LSTM network performance in problems unsolvable by traditional recurrent nets". Neural Networks. 16 (2): 241–250. CiteSeerX 10.1.1.381.1992. doi:10.1016/s0893-6080(02)00219-8. PMID 12628609.
26. ^A. Graves, J. Schmidhuber. Offline Handwriting Recognition with Multidimensional Recurrent Neural Networks. Advances in Neural Information Processing Systems 22, NIPS'22, pp 545–552, Vancouver, MIT Press, 2009.
27. ^Graves, Alex; Fernández, Santiago; Liwicki, Marcus; Bunke, Horst; Schmidhuber, Jürgen (2007). Unconstrained Online Handwriting Recognition with Recurrent Neural Networks. Proceedings of the 20th International Conference on Neural Information Processing Systems. NIPS'07. USA: Curran Associates Inc. pp. 577–584. ISBN .
28. ^Baccouche, M.; Mamalet, F.; Wolf, C.; Garcia, C.; Baskurt, A. (2011). "Sequential Deep Learning for Human Action Recognition". In Salah, A. A.; Lepri, B. (eds.). 2nd International Workshop on Human Behavior Understanding (HBU). Lecture Notes in Computer Science. 7065. Amsterdam, Netherlands: Springer. pp. 29–39. doi:10.1007/978-3-642-25446-8_4. ISBN .
29. ^Huang, Jie; Zhou, Wengang; Zhang, Qilin; Li, Houqiang; Li, Weiping (2018-01-30). "Video-based Sign Language Recognition without Temporal Segmentation". arXiv:1801.10111 [cs.CV].
30. ^Hochreiter, S.; Heusel, M.; Obermayer, K. (2007). "Fast model-based protein homology detection without alignment". Bioinformatics. 23 (14): 1728–1736. doi:10.1093/bioinformatics/btm247. PMID 17488755.
31. ^Thireou, T.; Reczko, M. (2007). "Bidirectional Long Short-Term Memory Networks for predicting the subcellular localization of eukaryotic proteins". IEEE/ACM Transactions on Computational Biology and Bioinformatics. 4 (3): 441–446. doi:10.1109/tcbb.2007.1015. PMID 17666763. S2CID 11787259.
32. ^Malhotra, Pankaj; Vig, Lovekesh; Shroff, Gautam; Agarwal, Puneet (April 2015). "Long Short Term Memory Networks for Anomaly Detection in Time Series"(PDF). European Symposium on Artificial Neural Networks, Computational Intelligence and Machine Learning — ESANN 2015.
33. ^Tax, N.; Verenich, I.; La Rosa, M.; Dumas, M. (2017). Predictive Business Process Monitoring with LSTM neural networks. Proceedings of the International Conference on Advanced Information Systems Engineering (CAiSE). Lecture Notes in Computer Science. 10253. pp. 477–492. arXiv:1612.02130. doi:10.1007/978-3-319-59536-8_30. ISBN . S2CID 2192354.
34. ^Choi, E.; Bahadori, M.T.; Schuetz, E.; Stewart, W.; Sun, J. (2016). "Doctor AI: Predicting Clinical Events via Recurrent Neural Networks". Proceedings of the 1st Machine Learning for Healthcare Conference. 56: 301–318. arXiv:1511.05942. Bibcode:2015arXiv151105942C. PMC 5341604. PMID 28286600.
35. ^Jia, Robin; Liang, Percy (2016). "Data Recombination for Neural Semantic Parsing". arXiv:1606.03622 [cs.CL].
36. ^Wang, Le; Duan, Xuhuan; Zhang, Qilin; Niu, Zhenxing; Hua, Gang; Zheng, Nanning (2018-05-22). "Segment-Tube: Spatio-Temporal Action Localization in Untrimmed Videos with Per-Frame Segmentation"(PDF). Sensors. 18 (5): 1657. doi:10.3390/s18051657. ISSN 1424-8220. PMC 5982167. PMID 29789447.
37. ^Duan, Xuhuan; Wang, Le; Zhai, Changbo; Zheng, Nanning; Zhang, Qilin; Niu, Zhenxing; Hua, Gang (2018). Joint Spatio-Temporal Action Localization in Untrimmed Videos with Per-Frame Segmentation. 25th IEEE International Conference on Image Processing (ICIP). doi:10.1109/icip.2018.8451692. ISBN .
38. ^Orsini, F.; Gastaldi, M.; Mantecchini, L.; Rossi, R. (2019). Neural networks trained with WiFi traces to predict airport passenger behavior. 6th International Conference on Models and Technologies for Intelligent Transportation Systems. Krakow: IEEE. arXiv:1910.14026. doi:10.1109/MTITS.2019.8883365. 8883365.
39. ^Zhao, Z.; Chen, W.; Wu, X.; Chen, P.C.Y.; Liu, J. (2017). "LSTM network: A deep learning approach for Short-term traffic forecast". IET Intelligent Transport Systems. 11 (2): 68–75. doi:10.1049/iet-its.2016.0208.
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Источник: https://en.wikipedia.org/wiki/Long_short-term_memory

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The comprehensive features of this product will definitely surprise you. ### required system Windows 10 32/64 bit Windows 2008 Windows 8 32/64 bit Windows 7 32/64 bit Windows Vista 32/64 bit Windows XP ### Pictures ### Installation guide In the Readme file in the Crack folder. ### download link Download Rank Tracker Enterprise v8.40.10 x64 Multilingual Download Rank Tracker Enterprise v8.40.10 x86 Multilingual Download Rank Tracker Enterprise 8.27.1 Multilingual file password link Follow On Facebook Follow On Linkedin Follow On Reddit Источник: https://tech-story.net/rank-tracker-enterprise-v8-40-10-x86-x64/ ## Discovery of temperature-induced stability reversal in perovskites using high-throughput robotic learning ### Abstract Stability of perovskite-based photovoltaics remains a topic requiring further attention. Cation engineering influences perovskite stability, with the present-day understanding of the impact of cations based on accelerated ageing tests at higher-than-operating temperatures (e.g. 140°C). By coupling high-throughput experimentation with machine learning, we discover a weak correlation between high/low-temperature stability with a stability-reversal behavior. At high ageing temperatures, increasing organic cation (e.g. methylammonium) or decreasing inorganic cation (e.g. cesium) in multi-cation perovskites has detrimental impact on photo/thermal-stability; but below 100°C, the impact is reversed. The underlying mechanism is revealed by calculating the kinetic activation energy in perovskite decomposition. We further identify that incorporating at least 10 mol.% MA and up to 5 mol.% Cs/Rb to maximize the device stability at device-operating temperature (<100°C). We close by demonstrating the methylammonium-containing perovskite solar cells showing negligible efficiency loss compared to its initial efficiency after 1800 hours of working under illumination at 30°C. ### Introduction Perovskite materials have opened up new avenues for fabricating high-performance optoelectronic devices1,2,3,4,5,6,7,8,9, among which formamidinium-lead-triiodide (FAPbI3) based multi-cation perovskites are of intense interest due to their superior optoelectronic properties1,5,7,8,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24. Current understanding of the impact of A-site cations – that incorporation of inorganic cations improve perovskite stability while organic cations (e.g. methylammonium (MA)) destabilize materials and devices – is mainly derived from accelerated ageing tests at high temperatures that are far beyond the standard device-operating temperatures (60–85 °C)6,7,8,11,12,13,14,15,16,17,18,19 (Table S1). In this work, we use high-throughput engineering combined with machine learning to analyze the stability of multi-cation perovskites. We find that the impact of the ratio of organic: inorganic cations is reversed when the aging temperature is reduced to below 100 °C. Specifically, organic cation (e.g. MA) is in fact, a stability-enhancer while inorganic cation (e.g. Cs/Rb) is a stability-killer below 100 °C. We define this phenomenon as stability reversal in perovskites, which is further translated to device stability. ### Results ### Workflow of the high-throughput robot system First, we utilize a high-throughput robot (HTRobot) system coupled with machine learning to assess the photothermal stability of mixed-cation perovskites under different ageing conditions. The crystal structure of the ABX3 perovskite is shown in Fig. 1a, where A denotes a monovalent cation, B denotes lead, and X denotes a halide. In this study, FAPbI3 is the host material with methylammonium (MA), cesium (Cs), rubidium (Rb), and potassium (K) as combinatorial cations. As shown in Fig. 1b, the HTRobot system starts with a small number of mother solutions, followed by automatic mixing to form the desired precursors (e.g., FAPbI3). The as-prepared precursors were sequentially distributed to a custom 72-well plate and later used to deposit perovskite layer on glass substrates via drop-casting and spin-coating. For stability testing, the sample plates were transferred back-and-forth between the analytical platform and the climate chambers preset at varying temperature-humidity conditions (Supplementary Fig. 1). The detailed workflow is shown in Fig. 1c. The HTRobot automatically synthesizes, characterizes, and analyzes the materials of interest. The photographs in Fig. 1d, combined with Supplementary Movie 1, shows the platform component and its automatic process. In total, over 1000 samples were fabricated ### Stability analysis of mixed-cation perovskites The figure-of-merit for stability assessment is denoted T80 = 0.2/$$k_{{\mathrm{dec}}}$$ and is obtained by the linear fitting of Eq. (1): $$A = A_0 - k_{{\mathrm{dec}}} \times t$$ (1) where A is the absorbance (normalized to 1), t is the aging time, and $$k_{\mathrm{dec}}$$ is the decomposition rate (s−1). T80 indicates the time required to decay 20% from its initial value15. During the decomposition process, the absorbance at 700–760 nm decreases. Instead of continuous decrease, the photoluminescence (PL) intensity shows an increasing trend at the early stage. This increase might be due to the improved crystal quality or PbI2 passivation21,23 (Supplementary Figs. 2 and 3). Since the relative absorbance value is only determined by perovskite degradation, we use the absorption spectra to extract T80 in the following discussion. This zero-order decomposition kinetics is also consistent with XRD measurement, showing a linear increase of PbI2 over time. Sixty-four kinds of perovskite including over stoichiometric samples with excess halide salts were fabricated through drop-cast and spin-coat methods3, as shown in Table S1. The selection for the 64 compositions is mainly based on the phase diagram of mixed-cation perovskites25. The selection for the 64 compositions is mainly based on the phase diagram of mixed-cation perovskites25. Above 300 K, the miscibility gap is at ~25 mol.% for Cs/MA cations in FAPbI3-based perovskites while it is at ~5 mol.% for K/Rb cations. To examine the de-mixing effect on photo/thermal stability of perovskites, we also prepared some perovskites with excess 5 or 10 mol.% MA/K/Rb/Cs above the miscibility gap. The XRD spectra show that most pristine samples mainly consist of α-phase perovskite (Supplementary Fig. 4), except for the control FAPbI3. Figure 2a presents the T80 color map for the 64 unsealed drop-cast films aged at 85 °C/140 °C with 10% RH and under illumination with N2 flow. Low humidity is used because many samples show δ phase under high humidity (over 30% RH; Supplementary Fig. 5). Considering all the ageing conditions for these 64 compositions, we fabricated over 1400 samples in this study (Supplementary Fig. 6), and the raw data and analysis codes are provided in the Supplementary Data 1–2 and Supplementary Software 1, respectively. We first determined the features governing stability at different aging temperatures using gradient boosting decision tree (GBT) interpreted by SHapley Additive exPlanations (SHAP), as shown in Fig. 2b. The observation and prediction results of the randomly-split train-test set indicate high accuracy of GBT regression (Supplementary Fig. 7). A positive SHAP value indicates the beneficial impact of one feature on model output (predicted T80). The features ranked using a global database show that the stoichiometry and deposition method has large impacts on stability. The over-stoichiometric condition (Row. 1/2/5/6) leads to worse stability (Row. 3/4/7/8; Fig. 2a), which may be related to their higher defect density implied by the lower PL intensity (Supplementary Fig. 8). The influence of the deposition method is due to variations in the grain size (Supplementary Fig. 9), defect density, or internal strain26,27. Remarkably, we discover that the impact of each feature on the stability is temperature-dependent, especially for the impact of cation. The incorporation of Cs shows beneficial impact on stabilizing perovskites at high temperatures (>100 °C) while it becomes detrimental at low temperatures. Differing from Cs, doping of MA is overall neutral to stabilizing perovskites and becomes more positive at low temperatures (<100 °C; Fig. 2b and Supplementary Fig. 7). The experimental reproducibility of our high-throughput system is validified by a close-to-one self-correlation coefficient by correlating T80 lifetime between two samples with identical compositions, processings and ageing conditions (Fig. 2c/d and Supplementary Fig. 10). By plotting T80 at 85 °C against T80 at 100 °C/140 °C for each identical composition, we further demonstrate a weak correlation between high/low-temperature stability manifested by low Pearson correlation coefficients of 0.37/0.31 (Fig. 2c). The above results indicate that low-temperature stability does not have a simple linear relationship with high-temperature stability. For photo-stability at 60 °C with N2 flow, the correlation between photo-stability and thermal-stability shows even lower Pearson coefficients of 0.07/0.17 when the aging temperature is over 100 °C (Fig. 2d). A low r-value of 0.35 is also observed in the spin-coating samples for 85 °C/140 °C correlation (Supplementary Fig. 12). GBT regression of separated drop-cast/spin-coat subset further demonstrates the generic character of stability reversal in perovskites: higher ratio of MA to Cs, MA to Rb, or FA to Cs normally produces better stability below 100 °C while it produces worse stability above 100 °C (Supplementary Fig. 7). Meanwhile, by comparing the T80 of Cs/MA-containing samples, we find that 140 °C-T80 shows an increasing trend from No. 22 (Cs0.05FA0.95PbI3) to No. 26 (Cs0.30FA0.70PbI3), while this trend is almost reversed for 85 °C-T80 (Fig. 2a). No. 53 → 55, No. 57 → 59, No. 61 → 63, and No. 8 → 11 show similar reversal behaviors. The Arrhenius plot further shows that kdec = 0.2/T80 of MA-rich perovskites grows faster than that of MA-poor perovskites (MA concentration <5%) as the ageing temperature rises, leading to a crossover at approximately 110 °C (Fig. 2e). This phenomenon is also observed in No. 28 vs. No. 22/23 with a crossover at ~85 °C (Supplementary Fig. 13). MAPbI3 (No. 32) also shows stability reversal with FAPbI3 free rank tracker - Free Activators. 1), indicated by the Arrhenius plot (Fig. 2f). An extrapolated crossover at ~15 °C is expected. The slope is correlated with the equivalent activation energy Eq. (2): $$k_{{\mathrm{dec}}} = {{k}}_0 \times e^{ - \frac{{E_{\mathrm{a}}}}{{k_{\mathrm{B}}T}}}$$ (2) where k0 is the rate constant (s−1), Ea is the activation energy (eV) representing the height of the reaction barrier, and kBT is the product of the Boltzmann constant and the temperature. That is, the decomposition of MAPbI3 has a larger $$E_a$$ than that of FAPbI3 perovskite (1.16 eV vs. 0.92 eV). The instability of MAPbI3 mainly originates from its huge rate constant ($$k_0$$) compared with FAPbI3 (109.4 s−1 vs. 105.3 s−1). This result is consistent with a previous report that MAPbI3 has higher activation energy than that of FAPbI3 for decomposition28. Likewise, MA-rich perovskites have statistically higher $$E_a$$ (0.84–1.06 eV) and k0 (104.5 s−1–107.1 s−1) than do Cs/Rb-rich perovskites ($$E_a$$: 0.71–0.92 eV; $$k_0$$: 102.3 s−1–105.6 s−1), as shown in Supplementary Fig. 13. The T80 of a series of CsxMAyFA1-x-yPbI3 (x + y = const.) further illustrates the stability-reversal behavior (Fig. 2g, h). At 140 °C, T80 increases with more Cs into the perovskite lattice; yet this trend is altered or even reversed as temperature drops below 100 °C. The stability-reversal behavior was also confirmed by tracking PbI2 using X-ray diffraction (Supplementary Fig. 14). The spin-coated samples present the same behavior as drop-cast samples (Supplementary Fig. 12). For the photo-stability at 60 °C, increasing Cs (>5 mol.%) impairs the stability while increasing MA improves the stability in multi-cation perovskites (Fig. 2g). The beneficial effects of MA over Cs/Rb on photo-stability were also found in spin-coated perovskites (Supplementary Fig. 15). Without any encapsulation, MA-containing perovskites show ultralong T80 values of 3500 hours and 6300 hours for spin-coated films and drop-cast films, respectively (Supplementary Fig. 16). Although increasing the Cs concentration in some cases gradually improves T80 in over-stoichiometric samples, this does not reflect an intrinsic property because the excess halide salts are found to serve as feedstock to reconstruct perovskite under light soaking, causing spectral shift (Supplementary Fig. 17). Meanwhile, most samples without excess organic salts show negilible PL shift during the degradation process, except for Cs-rich perovskites (Cs > 15 mol.%) fabricated throguh spin-coating process showing siginificant blueshift at 140 °C (Supplementary Fig. 18). This blueshift might be caused by Cs accumulation in the degraded films after MA/FA is volatilized. ### Theoretical explanation for the stability-reversal behavior To elucidate the possible origin of the stability-reversal behavior, we performed first-principles calculations for multi-cation perovskites. Since the decomposition rate can be transformed from thermodynamic control to kinetic control as the ageing temperature falls29,30,31 (Supplementary Note 1), we theoretically studied this system from both of the thermodynamic (dissociation energy) and kinetic (activation energy) perspectives. First, the energy costs of perovskite decomposition from APbI3 to AI and PbI2, with A = MA/FA/Cs, are presented in Supplementary Fig. 19, and the values reflect the thermodynamic stability at high temperatures. We find that MAPbI3 is least favorable thermodynamically. The incorporation of MA also leads to the lower thermodynamic stability of FAPbI3 compared with the beneficial effect of Cs doping. This result explains the detrimental impact of increasing the ratio of MA to Cs and of FA to Cs on the high-temperature stability. To evaluate the stability at low temperatures, we examined the kinetic rate-limiting step by comparing the activation energies of several possible decomposition-pathways (Fig. 3a–d). Previous works suggested that MA splitting is the main reason for the poor stability of MA-containing perovskites8,16,18,19. However, the cleavage of MA has a large energy barrier of 5 eV, although it is smaller than that of FA cleavage (5.4 eV; Fig. 3b). We further examined the most accessible decomposition paths shown in Fig. 3a and the corresponding potential energy profiles (Fig. 3c–f). DFT results show that the protonation of surface I atoms plays a key role in promoting surface decomposition. With adsorbed protons, the activation energy for I-Pb bond-breaking and the subsequent HI desorption is reduced from ~2.7 eV to 0.2 eV for both MAPbI3 and FAPbI3. The protons can originate either from water molecules or from MA+/FA+ cations32. Subsequently, I vacancies at the Pb-I surface provide more feasible channels to desorb MA/FA molecules compared with the intact surface (Supplementary Fig. 19). The MA desorption barrier of 2.0 eV at the MAPbI3 surface is higher than that of FA (1.7 eV) at the FAPbI3 surface (Fig. 3e), which is consistent with the experimental results. Theoretical simulations for doping systems also validate that the incorporation of MA/Cs could also affects the desorption energy of its surrounding FA organics at both nearest neighbor (Fig. 3f) and second nearest neighbor (Supplementary Fig. 20). Specifically, Cs decreases the desorption energy of its surrounding FA while MA shows the contrary impact. Combined with the thermodynamic results, we conclude that the incorporation of MA in FAPbI3 decreases its formation energy and simultaneously increases the gas desorption barrier, yet Cs exerts the opposite effects. The larger $${{k}}_0$$ of MA-containing perovskites and MAPbI3 may also relate to the easier protonation of MA (Supplementary Note 2)32. To further validate our model, we identified the elements at perovskite surface using X-ray photoelectron spectroscopy with and without ion-beam etching (Supplementary Fig. 20). The results show that perovskites lose MA/FA cations after slight etching while Pb/I remains. Most interestingly, MA-containing perovskites tend to keep a higher organic cation concentration (MA/FA) at the film surface than FAPbI3 and Cs0.15FA0.85PbI3 under the same etching condition. Overall, DFT modeling and experimental results are in fairly good agreement and provide a plausible explanation of the temperature-induced stability reversal. However, we want to highlight that further DFT calculations are necessary and welcomed to further examine our model. ### Device stability of mixed-cation perovskites Combining phase stability with photo/thermal stability, the incorporation of appropriate MA with Cs/Rb/K (<5 mol.%) would maximize the device stability of FAPbI3-based perovskite solar cells (PSCs). We fabricated PSCs with mixed-cation perovskites (MAxCs0.15-xFA0.85PbI3) with an n-i-p structure of ITO/(SnO2:PEIE)/(PCBM:PMMA)/MnSO4/perovskite/PDCBT/Ta-WOx/Au (Fig. 4a). The averaging power conversion efficiency (PCE) of MA-free perovskites was improved from 17.5% to 19.1% and 18.3% by incorporating 5% and 10% MA respectively, due to increased defect tolerance and carrier diffusivity27,33 (Fig. 4b, c). The performance parameters are summarized in Table S3. The hysteresis in current–voltage scan is negligible in this device structure (Supplementary Fig. 22). The characterization of device stability follows the ISOS-D-2/3 protocol and ISOS-L-1 protocol15. Although MA-rich PSCs degrade faster than Cs-rich PSCs at 140 °C (Fig. 4d and Supplementary Fig. 23), the stability tests at standard device operating conditions did not follow this trend. Under 85 °C/85%RH, the top-sealed devices with Cs0.15FA0.85PbI3 suffer ~25% PCE loss after 1400 h of ageing, while the devices with 5–10% MA degrade less than 5% (Fig. 4e). None of the devices showed PCE losses after 2000 h of ageing at 60 °C in the dark (Supplementary Fig. 24). Note that the α−δ phase transition is inhibited by PDCBT layer and PEIE in SnO2. We further tracked both the forward-scan and reverse-scan PCE of the devices biased at short-circuit conditions under 100 mW cm−2 white LED illumination, following the ISOS-L-1 protocol15. As shown in Fig. 4f, all the devices show complex degradation behavior, due to evolving interface and ions’ redistribution34,35,36. We found that the long-term degradation in the devices can be roughly divided into two regimes before and after ~250 h. In the initial ~250 h (regime I), the device degradation is non-linear, which might be attributed to the impact of contact layer and interfacial change. After ~250 h (regime II), it gradually follows a linear degradation law. In regime II, the degradation rate decreases with higher MA concentration for both the forward and reverse scans. The global evolution of absolute efficiency is presented in Supplementary Fig. 24. We further used maximum power point (MPP) tracking for one MA0.1Cs0.05FA0.85PbI3-based device. The device maintained 90% of the peak PCE value after 1800 h of continuous operation. The positive effect of MA on device operational stability at low temperatures is consistent with the high-throughput assessment of the photothermal stability of perovskite films. We also point out that the impact of perovskite composition on device stability can only be examined with robust contact layers in the device, otherwise the inactivation of contact or interface will dominate the overall device degradation (Supplementary Fig. 25). ### Discussions Previous studies on the long-term stability of perovskites are mainly based on accelerated ageing experiments by comparing few samples’ thermal stability at high temperatures (Table S1). Cation engineering is an important strategy on this front: incorporation of inorganic cations into the perovskite lattice improves device stability, while organic cations VMWare Workstation Pro 16.1.2 Crack With Keygen [Win + Mac] 2021. methylammonium (MA)) are viewed as destabilizing materials and devices. However, the study on device stability of perovskite solar cells with and without methylammonium shows contradictory results (Table S4). Based on automated high-throughput experiments under multiple ageing conditions, the importance of the specific temperature regime – in which the device will operate – is demonstrated. The effect of one cation on stability can be switched between detrimental and beneficial when the ageing condition is switched between low temperature and high temperature. The mechanism underlying the stability reversal is the change of both activation energy and rate constant in the decomposition by incorporating multiple cations into the perovskite lattice. This work sheds light on the complexity behind perovskite free rank tracker - Free Activators from the kinetic (activation energy) perspective, although we only provide one possible mechansim to explain the stability reversal. The stability reversal is only an icerberg of complex phenomena behind perovskite decomposition, for which further experimental and theoretical investigation on perovskite instability are still required. We note that the decomposition rate is non-linear with ageing temperature in the kinetic equation. Moreover, the activation energy and rate constant can be changed by manipulating the composition. With ageing temperature increases over a critical point, the relationship of stability between different perovskites could be very different, which is manifested by the low Pearson correlation coefficient. That is, a simple mapping relation between high- and low-temperature stability for perovskite films is unreliable, at least for all-iodine perovskites. A broader high-throughput study on cation engineering in I/Br-mixed perovskites is expected to reveal more helpful strategies to improve perovskite stability in the future. Based on our results, new strategies – incorporation of at least 10 mol.% organic MA and up to 5 mol.% inorganic cations (Cs/Rb) in perovskite lattice – should be adopted to improve the stability of device applications at temperatures below 100 °C. Considering the T80 lifetime for some screened perovskite is far beyond 4000 h under 120 mW cm−2 illumination at 60 °C, the stability of contact layers in devices is lagging behind the film stability for most reported devices. In addition to seeking ultra-stable perovskite layers, we should pay more attention to develop stable contacts to achieve longevity of perovskite photovoltaics. ### Methods ### Materials and solution preparation Unless stated otherwise, all materials were purchased from Sigma Aldrich or Merck and used as received. MAI and FAI were purchased from Xi’an P-OLED. PbI2 was purchased from Lumtec. The Ta-WOx colloidal solution was purchased from Avantama Ltd. The SnO2-PEIE solution was prepared by mixing 15 wt% SnO2 aqueous solution keyshot 5 license file free download with 1.8 mL of isopropanol and H2O (1/1, v/v) and 20 μL of PEIE. The PMMA:PCBM (1:5) precursor solution was prepared by mixing 1 mg/mL PMMA and 5 mg/mL PCBM chlorobenzene solution (1/1, v/v). For high-throughput film fabrication, a 1-M PbI2/FAI solution was prepared first in DMF and DMSO (4:1 v/v). A 1-M MAI/CsI/RbI/KI solution was prepared in DMSO. Sixty-four mixed-cation perovskite precursors were obtained by mixing the above mother solutions at the specific ratios described free rank tracker - Free Activators Supplementary Table 1. Here, the molar ratio is based on the volume ratio of the mother solutions. For film fabrication in devices, 1.2 M PbI2/FAI solution was prepared first in DMF and DMSO (4:1 v/v), and 1.2 M MAI/CsI solution was prepared in DMSO. The MAxCsyFA(1-x-y)PbI3 precursors were prepared by mixing the mother solutions in the target ratio. The PDCBT was dissolved in chlorobenzene at 15 mg/mL and stirred at 80 °C for 10 min before use. The PCBM was dissolved in chlorobenzene and 1,2-dichlorobenzene (9:1 v/v) at 10 mg/mL and stirred at 80 °C for 10 min before use. The MnAc2 and (NH4)2SO4 solutions (1.5 mg/mL) were prepared in a mixed solvent (H2O/IPA = 1/1, free rank tracker - Free Activators fabrication The high-resolution video for the high-throughput fabrication using drop-casting and spin-coating can be found in https://data.mendeley.com/datasets/6rbpx2fxf7/draft?a=a8ecd292-6a04-4467-9e38-85f30d937f5c and https://data.mendeley.com/datasets/9y74p4pyjz/draft?a=ce49c6e3-e3be-4e2b-9dda-41a4cdb5249e. For drop-casting, the precursors were diluted to 0.3 M using DMF to control the film thickness to a few hundred nanometers. The hotplate was kept at 130 °C, and a 4-μL aliquot was dropped on the plasma-treated glass substrate on the hotplate via the high-throughput robot system. After the program was finished, the samples were transferred to a N2-filled glovebox for post-treatment at 150 °C for 5 min before measurement. For each batch of sample, it takes around 3 min to finish the depostion process. For spin-coating, the plasma-treated glass substrates were coated with 80 μL of perovskite solution (1.2 M) at 200 rpm for 2 s, 2000 rpm for 2 s and 5000 rpm for 40 s. During the last step, 180 μL of chlorobenzene was dropped on the film at 20 seconds, followed by annealing at 110 °C for 10 min and 150 °C for 5 min. Since our home-made spin-coating robot has not been enclosed by N2-filled glovebox, the processing in ambient air with prolonged time might pose free rank tracker - Free Activators issue for the perovskite precursors and anti-solvent. Therefore, the spin-coat samples for high-throughput characterization are based on manual fabrication in N2-filled glovebox using the robot-prepared precursors. ### Analysis of the high-throughput data The data classification was processed by home-made VBA codes, while the data fitting is realized by VBA codes and MATLAB codes. The related information can be found in the auxiliary materials and Supplementary Movie 1. The raw dataset is uploaded to 10.17632/j3c7wnwxbc.1 The analysis codes are uploaded to 10.17632/2rbp5x8hf7.1 10.17632/42zcttrbr9.1 ### Device characterization The JV curves of the solar cells were obtained using a Keithley source under 100 mW cm−2 AM1.5 G illumination (Newport SollA solar simulator). The light intensity was calibrated with a certified crystalline Si-cell. The area of aperture mask is 0.113 cm2. The JV characteristics were measured from −0.1 to 1.2 V (forward scan) and 1.2 to −0.1 V (reverse scan) at a scan rate of 20 mV/s. The tests were tested in air at room temperature (around 25 °C). The external quantum efficiency (EQE) spectra were taken using an Enli Technology system. For the stability test, illumination was provided by a white LED (XLamp CXA2011 1300 K CCT) with 100 mW cm−2 intensity. The testing chamber was sealed by glass cover and filled with fresh N2 gas. The temperature is controlled at ~27 °C during the testing period. For maximum power point (MPP) tracking, the MPP tracking point is based on the reverse JV scan from 1.2 to −0.1 V every 2–3 h. The stabilized efficiency was obtained by fixing the bias at the MPP point for 2 min. The device temperature is controlled at ~30 °C by a cooling stage under the chamber. For the thermal stability test at 60 °C, the devices were placed on a hotplate kept at 60 °C without any encapsulation in ambient air. The humidity ranged from 35% to 45% RH. For the thermal stability test at 85 °C, the devices were top-sealed with glass cover and stored in a sample box in a climate chamber in the dark. For the Franzis CutOut Free Activate stability test at 140 °C, half devices without a hole transporting layer were placed on a hotplate in ambient air without any encapsulation. After the ageing process, the half devices were transferred to a glovebox for subsequent deposition of the hole transporting layer and Au. ### SHAP analysis based on Gradient-Boosted Trees The SHAP (SHapley Additive explanation) analysis follows the protocol from our previous work37. First, the dataset is grouped into three categories (<100 °C, 100 °C, and >100 °C) and is further split into 80%: 20% train: test set before being trained on gradient boosting with decision trees regression on scikit-learn python package38. The hyperparameters are optimized in the aforementioned algorithm to have the minimum 5-fold cross-validated root mean square error (RMSE). There are nine features included in the dataset: the compositions of A-site cations (K, Rb, Cs, MA, and FA), the deposition method (spin-coating or drop-casting), the stoichiometry (high value for over stoichiometry, and low value for standard stoichiometry), alpha-delta transition (high value indicates the presence of δ-phase in the pre-degraded films, and vice versa), and aging temperature (60, 85, 100, or 140 °C).To interpret the results and see how each dataset’s features contribute to the T80 output, the Shapley values from the trained models are analyzed using SHAP (SHapley Additive explanation) package37. Each point in the SHAP plot represents the measured data point. High SHAP value means that the data point has a high T80 value and vice versa. The SHAP plot is ranked by its importance, with the top one represents the most important feature that contributes to the output. The color bar represents how high and low the feature values are. Based on this information, we can see how each feature value contributes to a higher or lower T80 value based on the trained model39. ### Computational methods DFT calculations: The theoretical simulations were performed within the density functional theory (DFT) method as implemented in the Vienna ab initio simulation package (VASP) code. We used the Perdew, Burke and Ernzerhof generalized gradient approximation (PBE-GGA) for the exchange correlation functional. The atomic structures were fully relaxed until the maximum force acting on each ion was <0.01 eV Å−1. The 2 × 2 × 2 supercells were adopted with Monkhorst–Pack (MP) k-point meshes of 3 × 3 × 3 for bulk calculations. For all the considered perovskites, we used the cubic phases (a = b = c) in our simulations. The lattice constants are listed in Supplementary Table 3. For the perovskite surface, we employed the model with the bottom layer atoms fixed to their bulk positions and a vacuum space of 15 Å was imposed to avoid interactions between adjacent units. The energy profiles for decomposition of the 001 surface of MAPbI3 and FAPbI3 were calculated with the climbing image nudged elastic band (CI-NEB) method. ### Reporting summary Further information on research design is available in the Nature Research Reporting Summary linked to this article. ### Data availability The high-throughput data for the thermal-/photo-stability are available in separate Supplementary Data files in the Supplementary Information section. All other relevant data are available from the corresponding authors upon reasonable request. ### Code availability All the codes used in this manuscript can be found in: 10.17632/2rbp5x8hf7.1 10.17632/42zcttrbr9.1 https://github.com/PV-Lab/capping-layer ### References 1. 1. Stranks, S. D. & Snaith, H. J. Metal-halide perovskites for photovoltaic and light-emitting devices. Nat. Nanotechnol.10, 391–402 (2015). ADSCASArticle Google Scholar 2. 2. Correa-Baena, J. P. et al. Promises and challenges of perovskite solar cells. Science358, 739–744 (2017). ADSCASArticle Google Scholar 3. 3. Correa-Baena, J. P. et al. Homogenized halides and alkali cation segregation in alloyed organic-inorganic perovskites. Science363, 627–631 (2019). ADSCASArticle Google Scholar 4. 4. Eperon, G. E. et al. Perovskite-perovskite tandem photovoltaics with optimized band gaps. Science354, 861–865 (2016). ADSCASArticle Google Scholar 5. 5. Hou, Y. et al. Efficient tandem solar cells with solution-processed perovskite on textured crystalline silicon. Science367, 1135–1140 (2020). ADSCASArticle Google Scholar 6. 6. McMeekin, D. P. et al. A mixed-cation lead mixed-halide perovskite absorber for tandem solar cells. Science351, 151–155 (2016). ADSCASArticle Google Scholar 7. 7. Saliba, M. et al. Incorporation of rubidium cations into perovskite solar cells improves photovoltaic performance. Science354, 206–209 (2016). ADSCASArticle Google Scholar 8. 8. Turren-Cruz, S. H., Hagfeldt, A. & Saliba, M. Methylammonium-free, high-performance, and stable perovskite solar cells on a planar architecture. Science362, 449–453 (2018). ADSCASArticle Google Scholar 9. 9. National Renewable Energy Laboratory. Best Research-Cell Efficiency Chart (NREL, 2020). 10. 10. Abdi-Jalebi, M. et al. Maximizing and stabilizing luminescence from halide perovskites with potassium passivation. Nature555, 497–501 (2018). ADSCASArticle Google Scholar 11. 11. Niu, G., Li, W., Li, J., Liang, X. & Wang, L. Enhancement of thermal stability for perovskite solar cells through cesium doping. RSC Advances7, 17473–17479 (2017). ADSCASArticle Google Scholar 12. 12. Zhao, Y. et al. Perovskite seeding growth of formamidinium-lead-iodide-based perovskites for efficient and stable solar cells. Nat. Commun.9, 1607 (2018). ADSArticle Google Scholar 13. 13. Saliba, M. et al. Cesium-containing triple cation perovskite solar cells: improved stability, reproducibility and high efficiency. Energy Environ. Sci.9, 1989–1994 (2016). CASArticle Google Scholar 14. 14. Kulbak, M. et al. Cesium enhances long-term stability of lead bromide perovskite-based solar cells. J. Phys. Chem. Lett.7, 167–172 (2016). CASArticle Google Scholar 15. 15. Khenkin, M. V. et al. Consensus statement for stability assessment and reporting for perovskite photovoltaics based on ISOS procedures. Nat. Energy5, 35–49 (2020). ADSArticle Google Scholar 16. 16. Leijtens, T. et al. Towards enabling stable lead halide perovskite solar cells; interplay between structural, environmental, and thermal stability. J. Mater. Chem. A5, 11483–11500 (2017). CASArticle Google Scholar 17. 17. Tan, W., Bowring, A. R., Meng, A. C., McGehee, M. D. & McIntyre, P. C. Thermal stability of mixed cation metal halide perovskites in air. ACS Appl. Mater. Interfaces10, 5485–5491 (2018). CASArticle Google Scholar 18. 18. Juarez-Perez, E. J., Hawash, Z., Raga, S. R., Ono, L. K. & Qi, Y. Thermal degradation of CH3NH3PbI3 perovskite into NH3 and CH3I gases observed by coupled thermogravimetry–mass spectrometry analysis. Energy Environ. Sci.9, 3406–3410 (2016). CASArticle Google Scholar 19. 19. Juarez-Perez, E. J. et al. Photodecomposition and thermal decomposition in methylammonium halide lead perovskites and inferred design principles to increase photovoltaic device stability. J. Mater. Chem. A6, 9604–9612 (2018). CASArticle Google Scholar 20. 20. Jiang, Q. et al. Surface passivation of perovskite film for efficient solar cells. Nat. Photon.13, 460–466 (2019). ADSCASArticle Google Scholar 21. 21. Zhao, Y. et al. Double-side-passivated perovskite solar cells with ultra-low potential loss. Solar RRL3, 1800296 (2019). Article Google Scholar 22. 22. Yang, W. S. et al. Iodide management in formamidinium-lead-halide-based perovskite layers for efficient solar cells. Science356, 1376–1379 (2017). ADSCASArticle Google Scholar 23. 23. Jiang, Q. et al. Planar-structure perovskite solar cells with efficiency beyond 21. Adv. Mater.29, 1703852 (2017). Article Google Scholar 24. 24. Kim, M. et al. Methylammonium chloride induces intermediate phase stabilization for efficient perovskite solar cells. Joule3, 2179–2192 (2019). CASArticle Google Scholar 25. 25. Xu, Z. et al. Phase diagram and stability of mixed-cation lead iodide perovskites: a theory and experiment combined study. Phys. Rev. Mater.4, 095401 (2020). CASArticle Google Scholar 26. 26. Zhao, J. et al. Strained hybrid perovskite thin films and their impact on the intrinsic stability of perovskite solar cells. Sci. Adv.3, eaao5616 (2017). Article Google Scholar 27. 27. Saidaminov, M. I. et al. Multi-cation perovskites prevent carrier reflection from grain surfaces. Nat. Mater.19, 412–418 (2020). ADSCASArticle Google Scholar 28. 28. Smecca, E. et al. Stability of solution-processed MAPbI3 and FAPbI3 layers. Phys. Chem. Chem. Phys.18, 13413–13422 (2016). CASArticle Google Scholar 29. 29. Kondepudi, D. Introduction to Modern Thermodynamics (John Wiley & Sons, Ltd, 2008). 30. 30. Hänggi, P., Talkner, P. & Borkovec, M. Reaction-rate theory: fifty years after Kramers. Rev. Mod. Phys.62, 251–341 (1990). ADSMathSciNetArticle Google Scholar 31. 31. Hunt, I. Kinetic and Thermodynamic Control (University of Calgary, 2006). 32. 32. Schutt, K. et al. Overcoming zinc oxide interface instability with a methylammonium‐free perovskite for high‐performance solar cells. Adv. Funct. Mater.29, 1900466 (2019). CASArticle Google Scholar 33. 33. Tan, H. et al. Dipolar cations confer defect tolerance in wide-bandgap metal halide perovskites. Nat. Commun.9, 3100 (2018). ADSArticle Google Scholar 34. 34. Zhao, Y. et al. Quantification of light-enhanced ionic transport in lead iodide perovskite thin films and its solar cell applications. Light Sci. Appl.6, e16243 (2016). Article Google Scholar 35. 35. Saliba, M. Perovskite solar cells must come of age. Science359, 388–389 (2018). ADSCASArticle Google Scholar 36. 36. Juan-Pablo, C.-B. et al. Promises and challenges of perovskite solar cells. Science358, 739–744 (2017). ADSArticle Google Scholar 37. 37. Hartono, N. T. P. et al. How machine learning can help select capping layers to suppress perovskite degradation. Nat. Commun.11, 4172 (2020). ADSCASArticle Google Scholar 38. 38. Pedregosa, F. et al. Scikit-learn: machine learning in Python. J. Mach. Learn. Res.12, 2825–2830 (2011). MathSciNetMATH Google Scholar 39. 39. Lundberg, S. M., Lee, S.-I. A Unified Approach to Interpreting Model Predictions. pp. 4765–4774 (NIPS, 2017). Download references ### Acknowledgements Y.Z. acknowledges the Alexander von Humboldt Foundation for supporting his scientific research during the postdoctoral period (Grant number 1199604). Y.Z. thanks Yao Lu and Haifeng Yuan for the great support provided in editing the whole manuscript. The authors gratefully acknowledge the grants “ELF-PV - Design and Development of Solution-Processed Functional Materials for the Next Generations of PV Technologies” (no. 44-6521a/20/4) and “Solar Factory of the Future” (FKZ 20.2-3410.5-4-5) by the Bavarian State Government. C.J.B. gratefully acknowledges the financial support through the “Aufbruch Bayern” initiative of the state of Bavaria (EnCN and “Solar Factory of the Future”), the Bavarian Initiative “Solar Technologies go Hybrid” (SolTech), ITRG 2495 (DFG) and the SFB 953 (DFG). The authors acknowledge the financial support from the German Research Foundation with grant DFG INST 90/917-1 FUGG; Y.F. acknowledges the National Basic Research Programs of China (Grant No. 2016YFA0300900), and the NSFC with Grant No. 11974105, DFG INST 90/917-1 FUGG. J.Z., W.M., and K.Z. gratefully acknowledge support from the China Scholarship Council. ### Funding Open Access funding enabled and organized by Projekt DEAL. ### Author information Author notes 1. These authors contributed equally: Yicheng Zhao, Jiyun Zhang, Zhengwei Xu. ### Affiliations 1. Helmholtz-Institute Erlangen-Nürnberg (HI-ERN), Erlangen, Germany Yicheng Zhao, Jiyun Zhang, Stefan Langner, Thomas Heumueller, Ning Li, Xiaoyan Du, Tobias Stubhan, Jens Hauch & Christoph J. Brabec 2. Department of Materials Science and Engineering, Institute of Materials for Electronics and Energy Technology (i‐MEET), Friedrich‐Alexander‐Universität Erlangen‐Nürnberg, Erlangen, Germany Yicheng Zhao, Jiyun Zhang, Stefan Langner, Thomas Heumueller, Jack Elia, Ning Li, Gebhard J. Matt, Wei Meng, Andres Osvet, Kaicheng Zhang & Christoph J. Brabec 3. Hunan Provincial Key Laboratory of Low-Dimensional Structural Physics and Devices, School of Physics and Electronics, Hunan University, Changsha, China Zhengwei Xu & Yexin Feng 4. Photovaltaic Research Laboratory, Massachusetts Institute of Technology, Cambridge, MA, USA Shijing Sun, Noor Titan Putri Hartono & Tonio Buonassisi 5. Department of Electrical and Computer Engineering, University of Toronto, Toronto, ON, Canada Yi Hou & Edward H. Sargent ### Contributions Y.Z. conceived the idea and designed the experiments. Y.Z., Y.F., and C.J.B. supervised the project. Y.Z. and J. Z. performed the high-throughput experiments and analyzed the data. Z. X.and Y.F. performed the theoretical simulations. Y.Z. wrote the codes and fabricated the devices. T.H. characterized device stability. J. E.and Y.Z. carried out the SEM analysis. S.S., N.T.P.H., S.S., and T.B. performed the SHAP analysis. Y.Z. wrote the manuscript, and S.L., Y.H., T.H., N.L., G.J.M., A.O., K.Z., X.D., W.M., T.S., J.H., E.H.S, and C.J.B contributed to the editing of this manuscript. All authors contributed to the discussion of the work. ### Corresponding authors Correspondence to Yicheng Free rank tracker - Free Activators, Yexin Feng or Christoph J. Brabec. ### Ethics declarations ### Competing interests The authors declare no competing interests. ### Additional information Peer review informationNature Communications thanks Hannah-Noa Barad, Vladan Stevanović, Oleksandr Voznyy and the other, anonymous, reviewer(s) for their contribution to the peer review of this work. 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When to use it: use surveys to track customer satisfaction (CSAT surveys), customer effort (CES surveys), and how likely they are to recommend your products or brand (NPS surveys) over time.

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26. Now allows you to train with limitless websites, pages, and key phrases
27. And much more.

### What’s New In Rank Tracker 2021?

• Reveals your search engine rankings with a click of a button
• Monitors your competitors’ rankings and compares them to yours
• Shows if your site moved up or down in search results
• Lets you see how your ranking change over time
• Supports 597 different search engines
• Tracks rankings on auto-pilot if you choose
• Checks rankings as if from different countries of the world
• Tracks your universal search rankings
• Tracks multiple results for keyword
• Checks if only the right landing pages rank for your keywords
• Creates eye-candy graphs that show your progress visually

### Minimum Systems Requirements!

• Processor: Intel/AMD single-core
•  CPU clock speed: 1 GHz
• Computer memory (RAM): 1024 MB
•  Hard disk space:100 MB
•  Video adapter and monitor: Super VGA (1024 x 768)

### How to Crack?

2. Install many.
3. Don’t launch many after install.
4. Now open the crack folder.
5. Copy and replace each cracked bin folder from the Cracked directory into the default folder.
6. Confirm altering each bin folder including Rank Tracker 2021
7. That’s finished.

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### Related Videos

**😍 Super Accurate and Free Rank Tracker 😍** How to Track Keywords Ranking using Google Sheets 2021

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## 3 Replies to “Free rank tracker - Free Activators”

1. Mehdi Mehdi says:

But I am convinced there is an easy way to live with very little, and with a better exercise routine, one can keep quite healthy with very little, but it's just to hard to keep up with such a monotone boring diet. Like meditation, it just seems such another level of life that really truly feels out of place in our 'modern' way of living, for all kinds of good and bad reasons that we consider we can excuse with.

2. NickIsBlind says:

GoT theme рџЌ excellent video! Subbed

3. maheshwari Kudmethe says:

lol me