Quantum Dot Passivation of Halide Perovskite Films with Reduced Defects, Suppressed Phase Segregation, and Enhanced Stability.

ABSTRACT: Structural defects are ubiquitous for polycrystalline perovskite films, compromising device performance and stability. Herein, a universal method is developed to overcome this issue by incorporating halide perovskite quantum dots (QDs) into perovskite polycrystalline films. CsPbBr₃ QDs are deposited on four types of halide perovskite films (CsPbBr₃ , CsPbIBr₂ , CsPbBrI₂ , and MAPbI₃ ) and the interactions are triggered by annealing. The ions in the CsPbBr₃ QDs are released into the thin films to passivate defects, and concurrently the hydrophobic ligands of QDs self-assemble on the film surfaces and grain boundaries to reduce the defect density and enhance the film stability. For all QD-treated films, PL emission intensity a

SUBMITTER: Hu L 

PROVIDER: S-EPMC8805552 | biostudies-literature | 2022 Jan

REPOSITORIES: biostudies-literature