Improvements in Efficiency and Stability of Perovskite Solar Cells Using a Cesium Chloride Additive

Xiaodan Tang; Mengmeng Chen; Lulu Jiang; Miao Li; Guanqi Tang; Hairui Liu

doi:10.1021/acsami.2c07425

Improvements in Efficiency and Stability of Perovskite Solar Cells Using a Cesium Chloride Additive

ACS Appl Mater Interfaces. 2022 Jun 6. doi: 10.1021/acsami.2c07425. Online ahead of print.

Authors

Xiaodan Tang¹, Mengmeng Chen¹, Lulu Jiang¹, Miao Li¹, Guanqi Tang², Hairui Liu¹

Affiliations

¹ School of Materials Science and Engineering, Henan Normal University, Xinxiang, Henan 453007, P. R. China.
² Department of Applied Physics, The Hong Kong Polytechnic University, Kowloon 999077, Hong Kong.

PMID: 35658419
DOI: 10.1021/acsami.2c07425

Abstract

Perovskite films with few defects play a key role in preparing high-performance perovskite solar cells (PSCs). Here, cesium chloride (CsCl) was introduced as a modulator into a perovskite precursor for manipulating the crystallization of perovskite films. By introducing CsCl, dense homogeneous perovskite films with high crystallinity, preferential orientation, and a pure black perovskite phase were prepared. In addition, the carrier lifetime of perovskite films was significantly increased because of the suppressed nonradiative recombination. Correspondingly, the power conversion efficiency (PCE) of small-area devices using CsCl regulation was increased from 20.56 to 22.86%. The 1 cm² PSCs present a PCE of 21.53%, demonstrating their reliability for mass production. Furthermore, the device showed excellent stability maintaining 93.8% of its initial PCE after 500 h of continuous irradiation. Also, 95.3% of its PCE was kept after storage in ambient air for 2100 h. This study demonstrates that CsCl doping is a reliable way to prepare PSCs for practical applications.

Keywords: CsCl additive; crystallinity; high efficiency; perovskite solar cells; stability.