Light-Induced Halide Segregation in 2D and Quasi-2D Mixed-Halide Perovskites.

ABSTRACT: Photoinduced halide segregation hinders widespread application of three-dimensional (3D) mixed-halide perovskites. Much less is known about this phenomenon in lower-dimensional systems. Here, we study photoinduced halide segregation in lower-dimensional mixed iodide-bromide perovskites (PEA₂MA _n-1Pb _n (Br _x I_1-x )_3n+1, with PEA⁺: phenethylammonium and MA⁺: methylammonium) through time-dependent photoluminescence (PL) spectroscopy. We show that layered two-dimensional (2D) structures render additional stability against the demixing of halide phases under illumination. We ascribe this behavior to reduced halide mobility due to the intrinsic heterogeneity of 2D mixed-hali

SUBMITTER: Datta K 

PROVIDER: S-EPMC10111410 | biostudies-literature | 2023 Apr

REPOSITORIES: biostudies-literature