文献类型：期刊文献

英文题名：Constructing a Surface Multi-cationic Heterojunction for CsPbI1.5Br1.5 Perovskite Solar Cells with Efficiency beyond 14%

作者：Ye, Qiufeng[1,3]; Hu, Wenzheng[1]; Wei, Yunxiao[1]; Zhu, Junchi[1]; Yao, Bo[1]; Ren, Kuankuan[1]; Li, Chunhe[1]; Shi, Biyun[1]; Li, Tie[3]; Ye, Feng[2]; Fang, Zebo[1]

机构：[1] School of Mathmatical Information, Shaoxing University, Zhejiang, Shaoxing, 312000, China; [2] Shangyu College, Shaoxing University, Zhejiang, Shaoxing, 312300, China; [3] Science and Technology on Microsystem Laboratory, Shanghai Institute of Microsystem and Information Technology, Chinese Academy of Sciences, Shanghai, 200050, China

年份：2023

卷号：14

期号：5

起止页码：1140

外文期刊名：Journal of Physical Chemistry Letters

收录：EI(收录号：20230513536080)、Scopus(收录号：2-s2.0-85147171029)

语种：英文

外文关键词：Bromine compounds - Conversion efficiency - Lead compounds - Perovskite - Perovskite solar cells - Surface defects

外文摘要：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. ? 2023 American Chemical Society.