Abstract
Two-dimensional (2D) lead halide perovskite materials are emerging as one of promising light-absorbing materials in perovskite solar cells (PSCs), which show outstanding stability and defect passivation. Unfortunately, the power conversion efficiency (PCE) of those stable 2D PSCs is still far behind that of 3D PSCs. Herein, we reported a simple in-situ growth technique for the ethylenediamine lead iodide (EDAPbI4) layer on the top of formamidinium lead iodide (FAPbI3) layer. The rationally designed layered architecture of 2D-3D perovskite film could improve the PCE of the PSCs. In addition, benefiting from the high moisture resistance and inhibited ion migration of EDAPbI4 layer, the 2D-3D-based devices showed obviously enhanced long-term stability, keeping the initial PCE value for 200 h and 90% of its initial PCE even after 500 h.
摘要
二维(2D)卤化铅钙钛矿材料是钙钛矿太阳能电池(PSC)中最有前途的吸光材料之一, 具有优异的稳定性和缺陷钝化作用. 然而, 这些稳定的二维PSC的转换效率仍远远落后于三维钙钛矿电池. 在本文中我们通过原位生长的方法将2D EDAPbI4 层成功制备在3D FAPbI3层表面。这种合理设计的2D-3D钙钛矿薄膜分层结构可以明显提高电池的效率. 另外, 由于EDAPbI4 层的高抗湿性和抑制迁移, 2D-3D电池器件显示出明显增强的长期稳定性, 在200 h内一直保持初始转换效率, 甚至在500 h后仍能保持其初始转化效率的90%.
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Acknowledgements
This work was supported by the National Key Research and Development Program of China (2016YFA0202400), the 111 Project (B16016), the National Natural Science Foundation of China (51572080, 51702096 and U1705256), the Fundamental Research Funds for the Central Universities (2018ZD07, 2017MS021 and 2019MS027), and the Double Top Construction Program of North China Electric Power University (XM1805314).
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Wu YH prepared the perovskite films, fabricated the solar cell devices and wrote this manuscript. Pan X and Ding Y directly guided this research including the designing, modifying and optimizing work related to this manuscript. Dai SY supervised the projects and carefully reviewed and modified this manuscript. Liu XY, Ding XH and Liu XP performed the characterization. All authors contributed to the general discussion about this work.
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The authors declare that they have no conflict of interest.
Ya-Han Wu received her BSc degree from Inner Mongolia Normal University in 2011 and MSc degree from Inner Mongolia University in 2014, respectively. She is now a PhD candidate of the North China Electric Power University under the supervision of Profs. Xu Pan and Song-Yuan Dai. Her research interests mainly focus on perovskite solar cells.
Yong Ding received his PhD from Hefei Institutes of Physical Science, Chinese Academy of Sciences (CAS) in 2016, and became a lecturer in North China Electric Power University (NCEPU). His research interests are focused on the 2D perovskite-based photoelectric devices, including perovskite solar cells and light-emitting diodes.
Xu Pan received his PhD degree from the Chinese Academy of Sciences in 2007. He joined Hefei Institutes of Physical Science, CAS and was promoted to full professor in 2013. Now his research interest focuses on the new generation solar cells, including dye-sensitized solar cells and perovskite solar cells, etc.
Song-Yuan Dai is a professor of the School of Renewable Energy, North China Electric Power University. He obtained his BSc degree in physics from Anhui Normal University in 1987, and MSc and PhD degrees in plasma physics from the Institute of Plasma Physics, CAS in 1991 and 2001, respectively. His research interest mainly focuses on next-generation solar cells including dye-sensitized solar cells, quantum dot solar cells, perovskite solar cells, etc.
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Wu, YH., Ding, Y., Liu, XY. et al. Ambient stable FAPbI3-based perovskite solar cells with a 2D-EDAPbI4 thin capping layer. Sci. China Mater. 63, 47–54 (2020). https://doi.org/10.1007/s40843-019-1174-3
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DOI: https://doi.org/10.1007/s40843-019-1174-3