Inhibited Crack Development by Compressive Strain in Perovskite Solar Cells with Improved Mechanical Stability

• DOI: 10.1002/adma.202211257
• Publication Date: 2023-02-08T22:04:10Z
• Authors: Guizhou Yuan; Wenqiang Xie; Qizhen Song; Sai Ma; Yue Ma; Congbo Shi; Mengqi Xiao; Fengtao Pei; Xiuxiu Niu; Ying Zhang; Jie Dou; Cheng Zhu; Yang Bai; Yiliang Wu; Hao Wang; Qunbo Fan; Qi Chen
• Keywords: Delamination; Temperature cycling; Thermal Stability; Strain (injury)

Metal halide perovskites are promising as next-generation photovoltaic materials, but stability issues still a huge obstacle to their commercialization. Here, the formation and evolution of cracks in perovskite films during thermal cycling, which affect mechanical stability, investigated. Compressive strain is employed suppress delamination by situ formed polymers with low elastic modulus crystal growth. The resultant devices pass thermal-cycling qualification (IEC61215:2016), retaining 95% initial power conversion efficiency (PCE) compressive after 230 cycles. Meanwhile, p-i-n deliver PCEs 23.91% (0.0805 cm2 ) 23.27% (1 ). findings shed light on engineering respect evolution, enables mechanically stable solar cells.