Multi-environment phase stabilization by lattice reinforcement for efficient perovskite solar cells

• Published in: Science China materials Vol. 66; no. 7; pp. 2573 - 2581
• Main Authors: Xing, Zhi, Meng, Xiangchuan, Li, Dengxue, Li, Zongcai, Gong, Chenxiang, Hu, Xiaotian, Hu, Ting, Chen, Yiwang
• Format: Journal Article
• Language: English
• Published: Beijing Science China Press 01.07.2023; Springer Nature B.V
• Subjects: Absorption spectra; Chemistry and Materials Science; Chemistry/Food Science; Crystal lattices; Materials Science; Perovskites; Phase transitions; Photoelectricity; Photovoltaic cells; Residual stress; Solar cells; Substrates; Thermal stability; lattice distortion; residual stress; upscaling fabrication; phase transition; perovskite solar cells
• ISSN: 2095-8226; 2199-4501
• DOI: 10.1007/s40843-022-2400-9

Formamidine (FA)-rich perovskite solar cells (PSCs) display high competitiveness for commercial applications due to their excellent thermal stability and wide spectral absorption. However, an undesired phase transition is induced in FA-rich PSCs through an excessively distorted crystal lattice, which is considerably controlled by residual stress. In this work, by constructing a series of lattice-reinforced structures, the differential interaction between the organic spacer cations and inorganic octahedra is verified. Furthermore, by exploring the transition processes of α-phase to -β-phase and δ-phase, the importance of the relationship between the residual stress release and lattice reinforcement is revealed. Finally, the phenmethylammonium-treated device exhibits an outstanding photoelectric conversion efficiency (PCE) of 22.90% with a suppressed multipath phase transition, and can maintain 90% of its initial performance after being placed in the air for 1000 h. Additionally, a PCE of 17.10% is achieved on a mini-module with a 25-cm 2 substrate, verifying its feasible upscaling fabrication.