Functional organic cation induced 3D-to-0D phase transformation and surface reconstruction of CsPbI3 inorganic perovskite

Yuetian Chen; Xingtao Wang; Yao Wang; Xiaomin Liu; Yanfeng Miao; Yixin Zhao

doi:10.1016/j.scib.2023.03.029

Functional organic cation induced 3D-to-0D phase transformation and surface reconstruction of CsPbI₃ inorganic perovskite

Sci Bull (Beijing). 2023 Apr 15;68(7):706-712. doi: 10.1016/j.scib.2023.03.029. Epub 2023 Mar 17.

Authors

Yuetian Chen¹, Xingtao Wang¹, Yao Wang¹, Xiaomin Liu¹, Yanfeng Miao¹, Yixin Zhao²

Affiliations

¹ School of Environmental Science and Engineering, Frontiers Science Center for Transformative Molecules, Shanghai Jiao Tong University, Shanghai 200240, China.
² School of Environmental Science and Engineering, Frontiers Science Center for Transformative Molecules, Shanghai Jiao Tong University, Shanghai 200240, China; Shanghai Non-carbon Energy Conversion and Utilization Institute, Shanghai 200240, China; State Key Laboratory of Metal Matrix Composites, Shanghai Jiao Tong University, Shanghai 200240, China. Electronic address: yixin.zhao@sjtu.edu.cn.

PMID: 36966116
DOI: 10.1016/j.scib.2023.03.029

Abstract

Efficiency and stability are the main research focuses for perovskite solar cells. Inorganic perovskites like CsPbI₃ possess higher chemical stability than those with organic A-site cations, while they also exhibit higher defect density. Nonetheless, it is highly challenging to induce orderly secondary arrangement or reconstruction of inorganic perovskites with reduced defects because of their unique chemical properties. In this work, in-situ three-dimension-to-zero-dimension (3D-to-0D) phase transformation and surface reconstruction on CsPbI₃ film is achieved as induced by a functional organic cation, benzyldodecyldimethylammonium (BDA), a process of which that is similar to phase-transfer catalysis. With the help of BDABr salt treatment, 0D Cs₄PbI₆ perovskites are secondarily formed along CsPbI₃ grain boundaries with Cs-related cationic defects passivated, yielding structures of higher stability. The BDA-CsPbI₃ films exhibit reduced non-radiative recombination and promoted charge transfer, leading to inorganic perovskite solar cells with a high power conversion efficiency of 20.63% and good operational stability.

Keywords: CsPbI(3) inorganic perovskite; In-situ phase transformation; Inorganic perovskite solar cell; Secondary growth; Zero-dimension perovskite.