Extending the defect tolerance of halide perovskite nanocrystals to hot carrier cooling dynamics.

ABSTRACT: Defect tolerance is a critical enabling factor for efficient lead-halide perovskite materials, but the current understanding is primarily on band-edge (cold) carriers, with significant debate over whether hot carriers can also exhibit defect tolerance. Here, this important gap in the field is addressed by investigating how intentionally-introduced traps affect hot carrier relaxation in CsPbX₃ nanocrystals (X = Br, I, or mixture). Using femtosecond interband and intraband spectroscopy, along with energy-dependent photoluminescence measurements and kinetic modelling, it is found that hot carriers are not universally defect tolerant in CsPbX₃, but are strongly correlated to the defect tolerance of cold carriers, requiring shallow traps to be present (as in CsPbI₃

SUBMITTER: Ye J 

PROVIDER: S-EPMC11405528 | biostudies-literature | 2024 Sep

REPOSITORIES: biostudies-literature