Controlled Growth of Porous InBr₃: PbBr₂ Film for Preparation of CsPbBr₃ in Carbon-Based Planar Perovskite Solar Cells

• Main Authors: Kailin Chi, Hansi Xu, Bingtao Feng, Xianwei Meng, Daoyu Yu, Qian Li
• Format: Article
• Language: English
• Published: MDPI AG 2021-09-01
• Series: Nanomaterials
• Subjects: CsPbBr₃; planar perovskite solar cells; InBr₃; porous PbBr₂ film
• Online Access: https://www.mdpi.com/2079-4991/11/9/2408

Due to the low solubility of CsBr in organic solvents, the CsPbBr₃ film prepared by the multi-step method has holes and insufficient thickness, and the light absorption capacity and current density of the perovskite film hinder the further improvement in the power conversion efficiency (PCE) of CsPbBr₃ solar cells. In this study, we introduced InBr₃ into the PbBr₂ precursor solution and adjusted the concentration of PbBr₂, successfully prepared PbBr₂ with a porous structure on the compact TiO₂ (c-TiO₂) substrate to ensure that it fully reacted with CsBr, and obtained the planar carbon-based CsPbBr₃ solar cells with high-quality perovskite film. The results reveal that the porous PbBr₂ structure and the increasing PbBr₂ concentration are beneficial to increase the thickness of the CsPbBr₃ films, optimize the surface morphology, and significantly enhance the light absorption capacity. Finally, the PCE of the CsPbBr₃ solar cells obtained after conditions optimization was 5.76%.