Hexamethylphosphoramide-Assisted Structure and Morphology Regulation of a PbI2 Film for Air-Processed Efficient Perovskite Solar Cells via a Two-Step Deposition Method

• DOI: 10.1021/acssuschemeng.2c07526
• Publication Date: 2023-05-12T06:10:53Z
• Authors: Gangyi Zeng; Guangyao Liu; Xin Li
• Keywords: Glovebox; Hexamethylphosphoramide; One-Step; Spin Coating

The two-step deposited method with the advantages of high reproducibility and controllability is widely used in fabricating highly efficient perovskite solar cells (PSCs). However, it still a challenge to fabricate air-processed PSCs through this due existing techniques glove box circumstance that are not well extended ambient air-condition fabrication process. Here, hexamethylphosphoramide (HMPA) as solvent additive incorporated into first-step PbI2 precursor solution, which can effectively modify morphology crystallinity layer, thereby creating more opportunities for infiltration second-step organic salt. This coating leads full conversion from crystal large grains, reduced defects, enhanced uniformity final film. Consequently, champion efficiency 20.84% HMPA-based device fabricated using procedure achieved. shows long-term stability remaining 85.7% initial after 1000 h storage an air environment. demonstrates great potential toward PSCs.