Stretchable alkenamides terminated Ti3C2Tx MXenes to release strain for lattice‐stable mixed‐halide perovskite solar cells with suppressed halide segregation
Xuemei Yao,
Jialong Duan,
Yuanyuan Zhao,
Junshuai Zhang,
Qiyao Guo,
Qiaoyu Zhang,
Xiya Yang,
Yanyan Duan,
Peizhi Yang,
Qunwei Tang
Affiliations
Xuemei Yao
Institute of Carbon Neutrality, College of Chemical and Biological Engineering Shandong University of Science and Technology Qingdao Shandong China
Jialong Duan
Institute of Carbon Neutrality, College of Chemical and Biological Engineering Shandong University of Science and Technology Qingdao Shandong China
Yuanyuan Zhao
College of Mechanical and Electronic Engineering Shandong University of Science and Technology Qingdao Shandong China
Junshuai Zhang
College of Information Science and Technology Jinan University Guangzhou Guangdong China
Qiyao Guo
College of Information Science and Technology Jinan University Guangzhou Guangdong China
Qiaoyu Zhang
College of Information Science and Technology Jinan University Guangzhou Guangdong China
Xiya Yang
College of Information Science and Technology Jinan University Guangzhou Guangdong China
Yanyan Duan
School of Materials Science and Engineering, State Centre for International Cooperation on Designer Low‐Carbon and Environmental Material (SCICDLCEM) Zhengzhou University Zhengzhou Henan China
Peizhi Yang
Key Laboratory of Advanced Technique and Preparation for Renewable Energy Materials, Ministry of Education Yunnan Normal University Kunming Yunnan China
Qunwei Tang
Institute of Carbon Neutrality, College of Chemical and Biological Engineering Shandong University of Science and Technology Qingdao Shandong China
Abstract Bandgap‐tunable mixed‐halide perovskite materials have attracted considerable interest because of their indispensability as top counterparts in tandem solar cells. However, the soft and disordered lattice always suffers from severe phase segregation under illumination, which is particularly susceptible to residual lattice strain. Herein, we report a strain regulation strategy by using alkenamides terminated Ti3C2Tx MXenes as an additive into perovskite precursor. Apart from the role of a template for grain growth to obtain high‐quality films, the stretchable alkyl chain promotes lattice shrinkage or expansion to form an elastic grain boundary to eliminate the spatially distributed stain and shut down ion migration channels. As a result, the all‐inorganic perovskite solar cells based on CsPbIBr2 and CsPbI2Br halides achieve prolonged device stability under harsh conditions and the best power conversion efficiencies up to 11.06% and 14.30%, respectively.
