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Interface Engineering for All-Inorganic CsPbIBr2 Perovskite Solar Cells with Enhanced Power Conversion Efficiency over 11%
Energy Technology ( IF 3.8 ) Pub Date : 2021-09-18 , DOI: 10.1002/ente.202100562
Jing Wang 1 , Xin Wu 1 , Yizhe Liu 1 , Qifan Xue 2 , Hin-Lap Yip 2, 3, 4 , Alex K. Y. Jen 1, 3 , Zonglong Zhu 1
Affiliation  

Perovskite solar cells (PVSCs) receive great attention due to their excellent photovoltaic performance. Recently, all-inorganic PVSCs have been extensively studied owing to their superior thermal and photo stability. Among them, CsPbIBr2 perovskite stands out due to its superb phase stability in ambient environment. However, the severe energy loss caused by non-radiative recombination limits its development. Herein, a facile interface engineering method is employed to modify the electron transporting interface and reduce the energy loss. The insertion of a thin polyethylenimine ethoxylated (PEIE) film between SnO2 and the perovskite can simultaneously tune the work function of SnO2 and passivate the defects of the perovskite by the amino group in PEIE. Meanwhile, the PEIE interface serves as a modifier to enhance the crystallinity of the perovskite film, leading to enlarged grain size and reduced grain boundaries. As a result, the power conversion efficiency was enhanced from 8.7% for the SnO2-based device to 11.2% for the SnO2/PEIE-based device, with an open-circuit voltage of 1.29 V, a short-circuit current of 11.0 mA/cm2, and a fill factor of 78.6%. Moreover, the photostability of devices were improved, which retained over 80% of its initial efficiency under continuous one sun illumination for 500 h. This work proves the effectiveness of interface engineering to boost the efficiency and stability of all-inorganic PVSCs.

中文翻译:

全无机 CsPbIBr2 钙钛矿太阳能电池的界面工程,功率转换效率超过 11%

钙钛矿太阳能电池(PVSCs)因其优异的光伏性能而备受关注。最近,全无机 PVSC 因其优异的热稳定性和光稳定性而得到广泛研究。其中,CsPbIBr 2钙钛矿因其在周围环境中出色的相稳定性而脱颖而出。然而,非辐射复合造成的严重能量损失限制了其发展。在此,采用简便的界面工程方法来修饰电子传输界面并减少能量损失。在 SnO 2和钙钛矿之间插入聚乙烯亚胺乙氧基化 (PEIE) 薄膜可以同时调节 SnO 2的功函数并通过PEIE中的氨基钝化钙钛矿的缺陷。同时,PEIE界面作为改性剂来提高钙钛矿薄膜的结晶度,导致晶粒尺寸增大和晶界减小。结果,功率转换效率从基于SnO 2的器件的8.7% 提高到基于 SnO 2 /PEIE的器件的 11.2%,开路电压为 1.29 V,短路电流为 11.0 mA/cm 2,以及78.6%的填充因子。此外,器件的光稳定性得到改善,在连续单次阳光照射 500 小时下仍保持其初始效率的 80% 以上。这项工作证明了界面工程在提高全无机 PVSC 的效率和稳定性方面的有效性。
更新日期:2021-11-04
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