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Stable tin perovskite solar cells enabled by widening the time window for crystallization

拓宽溶液到结晶的时间窗口以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 the most promising candidates for lead-free perovskite solar cells (PSCs). However, the poor crystallization and chemical stability of Sn perovskites are the two challenging issues for further application of TPSCs. Here, we present a strategy to stabilize CH(NH2)2SnI3 (FASnI3) perovskite enabled by an amine complex, CH3NH3I·3CH3NH2, which can hinder the major degradation issue caused by the oxidation of Sn2+ to Sn4+. The resulting Sn perovskite films exhibit enhanced crystallinity and stability in comparison with those made with conventional inorganic SnF2 additives. Finally, the device achieved a higher external quantum efficiency for charge extraction and a power conversion efficiency (PCE) of 9.53%, which maintained more than 90% of the initial efficiency after 1000 h of light soaking under the standard AM 1.5 G solar illumination.

摘要

锡基钙钛矿太阳能电池(TPSC)是最具有应用前景的一类无铅钙钛矿太阳能电池(PSC). 然而, 锡基钙钛矿结晶性差和化学不稳定性是制约其进一步应用的两个挑战性问题. 本文中, 我们提出了一种策略, 通过胺络合物CH3NH3I·3CH3NH2 有效抑制了由Sn2+被氧化为Sn4+引起的钙钛矿降解问题, 来获得更稳定的CH(NH2)2SnI3(FASnI3)钙钛矿薄膜. 与仅使用常规的SnF2添加剂制备的锡基钙钛矿薄膜相比, 添加CH3NH3I·3CH3NH2后制备的薄膜的结晶性和稳定性得到增强. 最终, 所制备的器件获得了更高的外量子效率和9.53%的光电转换效率, 在标准的AM 1.5G模拟太阳光下老化1000 h后, 其效率仍然保持了初始效率的90%以上.

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Acknowledgements

This work was supported by the National Natural Science Foundation of China (11674219, 11834011 and 11911530142), the KAKEHI Grant of Japan (18H02078). We are grateful for the discussion about the XPS data reduction with Ms. Limin Sun and Ms. Xue Ding in the Instrumental Analysis Center of Shanghai Jiao Tong University. We thank Xiao Liu for his guidance and verification in device preparation.

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Authors and Affiliations

  1. State Key Laboratory of Metal Matrix Composites, School of Material Science and Engineering, Shanghai Jiao Tong University, Shanghai, 200240, China

    Zhensheng Dai  (戴臻盛), Wentao Tang  (唐文涛), Tao Wang  (王涛), Taoyuze Lv  (吕陶玉赜), Xinhui Luo  (罗新惠), Danyu Cui  (崔丹钰), Ruitian Sun  (孙瑞田), Liang Qiao  (乔亮), Han Chen  (陈汉), Xudong Yang  (杨旭东) & Liyuan Han  (韩礼元)

  2. Joint Research Center for Clean Energy Materials, Shanghai Jiao Tong University, Shanghai, 200240, China

    Zhensheng Dai  (戴臻盛), Wentao Tang  (唐文涛), Tao Wang  (王涛), Taoyuze Lv  (吕陶玉赜), Xinhui Luo  (罗新惠), Danyu Cui  (崔丹钰), Ruitian Sun  (孙瑞田), Liang Qiao  (乔亮), Han Chen  (陈汉), Xudong Yang  (杨旭东) & Liyuan Han  (韩礼元)

  3. School of Physics, Australian Centre for Microscopy & Microanalysis, Sydney Nano Institute, The University of Sydney, Sydney, NSW, 2006, Australia

    Taoyuze Lv  (吕陶玉赜) & Rongkun Zheng  (郑荣坤)

Authors
  1. Zhensheng Dai  (戴臻盛)
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  2. Wentao Tang  (唐文涛)
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  3. Tao Wang  (王涛)
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  4. Taoyuze Lv  (吕陶玉赜)
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  5. Xinhui Luo  (罗新惠)
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  6. Danyu Cui  (崔丹钰)
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  7. Ruitian Sun  (孙瑞田)
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  8. Liang Qiao  (乔亮)
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  9. Han Chen  (陈汉)
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  11. Xudong Yang  (杨旭东)
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  12. Liyuan Han  (韩礼元)
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Contributions

Author contributions Dai Z and Yang X conceived the idea; Dai Z carried out material and device fabrication and characterization; Tang W, Wang T, Lv T, Luo X, Cui D, Sun R, Qiao L, Zheng R and Chen H were involved in the data analysis; Dai Z and Yang X wrote the manuscript; Yang X and Han L supervised the whole project. 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 BSc 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.

Xudong Yang received his PhD degree from the Institute of Semiconductors, 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 mainly focuses on understanding the mechanisms of the photo-electron conversion, charge transporting and the fabrication of next generation optoelectronic devices for the applications in energy conversion.

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Dai, Z., Tang, W., Wang, T. et al. Stable tin perovskite solar cells enabled by widening the time window for crystallization. Sci. China Mater. 64, 1849–1857 (2021). https://doi.org/10.1007/s40843-020-1581-4

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