Cesium acetate-assisted crystallization for high-performance inverted CsPbI3perovskite solar cells

Tiantian Li; Yue Wu; Zhou Liu; Yuanbo Yang; Haowen Luo; Ludong Li; Peng Chen; Xueping Gao; Hairen Tan

doi:10.1088/1361-6528/ac76d5

Cesium acetate-assisted crystallization for high-performance inverted CsPbI₃perovskite solar cells

Nanotechnology. 2022 Jun 24;33(37). doi: 10.1088/1361-6528/ac76d5.

Authors

Tiantian Li^{1

2}, Yue Wu¹, Zhou Liu², Yuanbo Yang¹, Haowen Luo², Ludong Li², Peng Chen¹, Xueping Gao¹, Hairen Tan²

Affiliations

¹ School of Materials Science and Engineering, Nankai University, Tianjin 300350, People's Republic of China.
² National Laboratory of Solid State Microstructures, Jiangsu Key Laboratory of Artificial Functional Materials, College of Engineering and Applied Sciences, Frontiers Science Center for Critical Earth Material Cycling, Nanjing University, Nanjing 210023, People's Republic of China.

PMID: 35675793
DOI: 10.1088/1361-6528/ac76d5

Abstract

Efficient inverted (p-i-n) type CsPbI₃perovskite solar cells (PSCs) have revealed promising applications due to their excellent thermal and photostability. Regulating the nucleation and crystallization of perovskite film is an important route to improving the performance of CsPbI₃PSCs. Herein, we explored cesium acetate (CsAc) as additive to manipulate the crystallization process of CsPbI₃perovskite films. By involving in the intermediate phase DMA_1-xCs_xPbI_3-yAc_yof perovskite, the pseudo-halide acetate (Ac^-) can retard the ion exchange reaction between DMA⁺and Cs⁺, leading to a perovskite with dense morphology, low defect density, and a long carrier lifetime. As a result, the optimal CsPbI₃PSCs yielded a high power conversion efficiency of 18.3%. Moreover, the encapsulated devices showed excellent operational stability and the devices retained their initial performance following 500 h of operation at the maximum power point under one-sun illumination in ambient conditions.

Keywords: CsPbI3; additives; all-inorganic perovskte solar cells; crystal quality.