Effect of Crystal Symmetry of Lead Halide Perovskites on the Optical Orientation of Excitons.

ABSTRACT: The great variety of lead halide perovskite semiconductors represents an outstanding platform for studying crystal symmetry effects on the spin-dependent properties. Access to them is granted through the optical orientation of exciton and carrier spins by circularly polarized photons. Here, the exciton spin polarization is investigated at 1.6 K cryogenic temperature in four lead halide perovskite crystals with different symmetries: (almost) cubic in FA_0.9Cs_0.1PbI_2.8Br_0.2 and FAPbBr₃, and orthorhombic in MAPbI₃ and CsPbBr₃. Giant optical orientation of 85% is found for the excitons in FA_0.9Cs_0.1PbI_2.8Br_0.2, MAPbI₃, and CsPbBr₃, while it amounts to 20

SUBMITTER: Kopteva NE 

PROVIDER: S-EPMC12005751 | biostudies-literature | 2025 Apr

REPOSITORIES: biostudies-literature