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Stable tin perovskite solar cells developed via additive engineering

通过添加剂工程获得稳定的锡基钙钛矿太阳能电池

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Abstract

Tin perovskite solar cells (TPSCs) are promising for lead-free perovskite solar cells (PSCs) and have led to extensive research; however, the poor crystallinity and chemical stability of tin perovskites are two issues that prevent stable TPSCs. In this study, we outline a new process that addresses these issues by using tin(II) acetate (Sn(Ac)2) in place of the conventional SnF2 precursor additive. Compared with SnF2, Sn(Ac)2 improves the crystallinity and stability of tin perovskite with fewer defects and better charge extraction. Using this process, we developed a device that has a higher external quantum efficiency for charge extraction compared with the control devices and a power conversion efficiency of 9.93%, which maintained more than 90% of its initial efficiency after 1000 h operation at the maximum power point under standard AM 1.5G solar illumination.

摘要

锡基钙钛矿太阳能电池(TPSCs)是最具有应用前景的无铅钙钛矿太阳能电池(PSC)之一. 然而, 锡基钙钛矿结晶性差和化学不稳定性制约了其进一步应用. 在这里, 我们提出了一种新策略, 通过使用乙酸锡(II)来替代传统的SnF2作为前驱体添加剂来解决上述两个问题. 与SnF2相比, 乙酸锡(II)添加剂所制备的锡基钙钛矿薄膜具有更好的结晶性、 更高的稳定性、 更低的缺陷浓度, 同时能够在光伏器件中实现更有效的电荷提取. 基于乙酸锡(II)添加剂制备的锡基钙钛矿太阳能电池实现了9.93%的光电转换效率(PCE), 在标准AM 1.5G太阳光照射下以最大功率点运行1000 h后, 仍能保持初始效率的90%以上.

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Acknowledgements

This work was supported by the National Natural Science Foundation of China (11834011 and 11911530142). We thank the discussion about the XPS data reduction with Ms. Limin Sun and Ms. Xue Ding (the Instrumental Analysis Center of Shanghai Jiao Tong University). We are grateful for the guidance and verification in device preparations and characterizations by Xiao Liu.

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Authors and Affiliations

Authors

Contributions

Author contributions Yang X conducted the research project. Dai Z and Yang X conceived the idea. Dai Z, Lv T and Barbaud J carried out the fabrications and characterizations of materials and devices. Barbaud J and Dai Z carried out the DFT calculations and analyses. Tang W, Wang T, Qiao L, Zheng R and Chen H were involved in the data analyses. Dai Z, Lv T, Barbaud J and Yang X wrote the manuscript. Yang X, Zheng R and Han L revised the manuscript. All authors discussed and reviewed the final manuscript.

Corresponding author

Correspondence to Xudong Yang  (杨旭东).

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Conflict of interest The authors declare that they have no conflict of interest.

Additional information

Zhensheng Dai is currently a PhD candidate at the School of Materials Science and Engineering, Shanghai Jiao Tong University. He received his BS degree from the School of Materials Science and Engineering, Wuhan University of Technology, in 2016. His research focuses on highly efficient and stable perovskite solar cells.

Taoyuze Lv is a PhD student at the School of Physics, the University of Sydney, Australia. He received his bachelor’s degree in 2020 from Shenzhen University. His current research interest is the micro-scale simulation and characterization of the physical properties of perovskite materials.

Julien Barbaud is a PhD student at the School of Materials Science and Engineering, Shanghai Jiao Tong University. He obtained his master’s degree in 2017 at l’Ecole des Mines d’Albi, France. His current research interest revolves around numerical simulation of materials applied to perovskite-based photovoltaic devices.

Xudong Yang received his PhD degree from the Chinese Academy of Sciences. He did postdoctoral research at the University of Cambridge, UK and the International Center for Young Scientists of the National Institute for Materials Science, Japan. He joined Shanghai Jiao Tong University as a distinguished researcher in 2014. His current research is focused on understanding the mechanisms of the photoelectron conversion, charge transport, and the fabrication of next-generation optoelectronic devices for applications in energy conversion.

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Dai, Z., Lv, T., Barbaud, J. et al. Stable tin perovskite solar cells developed via additive engineering. Sci. China Mater. 64, 2645–2654 (2021). https://doi.org/10.1007/s40843-021-1670-0

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