Synergistic Solvent and Composition Engineering of Perovskites for Tandems on Industrial Silicon
Abstract
AbstractWide‐bandgap perovskites based on mixed formamidinium−cesium cation and iodide−bromide halide are promising materials in the top cells that are well‐matched with crystalline silicon bottom cells to construct efficient tandem photovoltaics. Nevertheless, mixed cation−halide perovskite films with submicron film thickness suffer from poor crystallinity with inhomogeneous and undesirable phases, owing to the presence of multiple pathways of crystal nucleation and phase transition. Herein, we propose a synergistic solvent and composition engineering (SSCE) strategy to regulate the solvated phases and manipulate the transition pathways simultaneously. The resultant mixed cation−halide perovskite film shows optimizing crystallization and desired phase structure with suppressed nonradiative recombination and improved phase stability under aging stresses. Consequently, the SSCE strategy enables the tandem cells based on industrially ultrathin silicon wafers (120 µm) to achieve a certified stabilized power conversion efficiency of 31.0%. Those encapsulated devices maintain 90% of their initial performance after 1200 h continuous operation.
Article Details
Authors (17)
Zhiliang Liu
Yang Tian
Shanghai Key Laboratory of Green Chemistry and Chemical Processes, School of Chemistry and Molecular Engineering, East China Normal University, Dongchuan Road 500, Shanghai 200241, China
Jun Chen
Mengsha Cao
Suzhou Maxwell Technologies Co., Ltd. Suzhou 215200 P.R. China
Zhibang Shen
Institute of High Energy Physics Chinese Academy of Science P.R. China
Shaofei Yang
Ke Fan
Interdisciplinary Institute of NMR and Molecular Sciences, Hubei Province for Coal Conversion and New Carbon Materials, School of Chemistry and Chemical Engineering
Xi Chen
Jia Yao
Zhejiang University , , 866 Yuhangtang Rd , ,
Zhijun Xiong
Suzhou Maxwell Technologies Co., Ltd. Suzhou 215200 P.R. China
Yu Chen
Jun Fang
Longbin Qiu
Zhong'an Li
Key Laboratory for Material Chemistry of Energy Conversion and Storage (Ministry of Education) Hubei Key Laboratory of Material Chemistry and Service Failure School of Chemistry and Chemical Engineering Huazhong University of Science and Technology (HUST) Wuhan 430074 China
Hong Zhang
Alex K.‐Y. Jen
Department of Materials Science and Engineering City University of Hong Kong Kowloon Hong Kong SAR
Kai Yao
School of Materials Science and Engineering