1D Choline‐PbI3‐Based Heterostructure Boosts Efficiency and Stability of CsPbI3 Perovskite Solar Cells

• Published in: Angewandte Chemie International Edition Vol. 62; no. 25; pp. e202303486 - n/a
• Main Authors: Zhang, Jianxin, Zhang, Guizhi, Su, Pei‐Yang, Huang, Rong, Lin, Jiage, Wang, Wenran, Pan, Zhenxiao, Rao, Huashang, Zhong, Xinhua
• Format: Journal Article
• Language: English
• Published: Weinheim Wiley Subscription Services, Inc 19-06-2023
• Edition: International ed. in English
• Subjects: 1D/3D Heterostructure; Carbon Electrode; Choline; Crystal defects; Heterostructures; Perovskite; Perovskites; Photoluminescence; Photons; Photovoltaic cells; Photovoltaics; Point defects; Solar Cells; Stability
• ISSN: 1433-7851; 1521-3773
• DOI: 10.1002/anie.202303486

Defects in perovskite are key factors in limiting the photovoltaic performance and stability of perovskite solar cells (PSCs). Generally, choline halide (ChX) can effectively passivate defects by binding with charged point defects of perovskite. However, we verified that ChI can react with CsPbI3 to form a novel crystal phase of one‐dimensional (1D) ChPbI3, which constructs 1D/3D heterostructure with 3D CsPbI3, passivating the defects of CsPbI3 more effectively and then resulting in significantly improved photoluminescence lifetime from 20.2 ns to 49.4 ns. Moreover, the outstanding chemical inertness of 1D ChPbI3 and the repair of undesired δ‐CsPbI3 deficiency during its formation process can significantly enhance the stability of CsPbI3 film. Benefiting from 1D/3D heterostructure, CsPbI3 carbon‐based PSCs (C‐PSCs) delivered a champion efficiency of 18.05 % and a new certified record of 17.8 % in hole transport material (HTM)‐free inorganic C‐PSCs.
ChPbI3 was obtained by ChI treatment of the CsPbI3 surface to construct a 1D/3D heterostructure, which significantly improves the defect‐assisted recombination and stability of CsPbI3. Benefiting from 1D/3D heterostructure, the assembled carbon‐based perovskite solar cells (C‐PSCs) delivered a champion/certified efficiency of 18.05 %/17.8 %.