Trifluoroacetate induced small-grained CsPbBr3 perovskite films result in efficient and stable light-emitting devices.

ABSTRACT: Quantum efficiencies of organic-inorganic hybrid lead halide perovskite light-emitting devices (LEDs) have increased significantly, but poor device operational stability still impedes their further development and application. All-inorganic perovskites show better stability than the hybrid counterparts, but the performance of their respective films used in LEDs is limited by the large perovskite grain sizes, which lowers the radiative recombination probability and results in grain boundary related trap states. We realize smooth and pinhole-free, small-grained inorganic perovskite films with improved photoluminescence quantum yield by introducing trifluoroacetate anions to effectively passivate surface defects and control the crystal growth. As a result, efficient green LEDs based on inorga

SUBMITTER: Wang H 

PROVIDER: S-EPMC6368619 | biostudies-literature | 2019 Feb

REPOSITORIES: biostudies-literature