异质结
钙钛矿(结构)
材料科学
钝化
能量转换效率
钙钛矿太阳能电池
光电子学
太阳能电池
串联
光电效应
光伏系统
图层(电子)
纳米技术
化学
结晶学
生态学
复合材料
生物
作者
Qiufeng Ye,Wenzheng Hu,Yunxiao Wei,Junchi Zhu,Bo Yao,Kuankuan Ren,Chunhe Li,Bi-Yun Shi,Tie Li,Feng Ye,Zebo Fang
标识
DOI:10.1021/acs.jpclett.2c03876
摘要
All-inorganic CsPbI1.5Br1.5 perovskite solar cells are considered as top cell candidates for tandem cells as a result of their excellent thermal stability and photoelectric performance. However, their power conversion efficiencies (PCEs) are still low and far below the theoretical limit mainly as a result of the severe non-radiative recombination and optical loss. Herein, we introduce an versatile method to construct a surface multi-cationic heterojunction to achieve an efficient and stable CsPbI1.5Br1.5 perovskite solar cell. By precisely controlling the content of FA+ and MA+ on PbBr2-rich perovskite films, a high-quality heterojunction layer is formed to help effectively passivate the surface defects and reduce the optical loss of the CsPbI1.5Br1.5 perovskite. In addition, the incorporation of a heterojunction layer can also improve energy-level alignment and reduce interfacial charge recombination loss. As a result, the champion device with the incorporation of SMH exhibits a PCE of 14.11%, which presents the highest reported efficiency for inorganic CsPbI1.5Br1.5 solar cells thus far while retaining 85% of the initial efficiency after 1000 h of storage without encapsulation.
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