文献类型：期刊文献

英文题名：Constructing a Surface Multi-cationic Heterojunction for CsPbI_1.5Br_1.5 Perovskite Solar Cells with Efficiency beyond 14%

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

机构：[1]Shaoxing Univ, Sch Math Informat, Shaoxing 312000, Zhejiang, Peoples R China;[2]Chinese Acad Sci, Shanghai Inst Microsyst & Informat Technol, Sci & Technol Microsyst Lab, Shanghai 200050, Peoples R China;[3]Shaoxing Univ, Shangyu Coll, Shaoxing 312300, Zhejiang, Peoples R 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：SCI-EXPANDED(收录号：WOS:000929939800001)、、WOS

基金：? ACKNOWLEDGMENTS This work was financially supported by the Natural Science Foundation of Zhejiang Province, China (Grant LQ22F040001) , the China Postdoctoral Science Foundation (Grant 2022M723281) , the Zhejiang Province Public Welfare Technology Application Research Project (Grants LGG20E030003 and LGG21F050001) , the Natural Science Foundation of Zhejiang Province, China (Grant LQ21B030005) , and the National Natural Science Foundation of China (Grants 12204313 and 51872186) .

语种：英文

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.