Impact of Orientational Glass Formation and Local Strain on Photo-Induced Halide Segregation in Hybrid Metal-Halide Perovskites.

ABSTRACT: Band gap tuning of hybrid metal-halide perovskites by halide substitution holds promise for tailored light absorption in tandem solar cells and emission in light-emitting diodes. However, the impact of halide substitution on the crystal structure and the fundamental mechanism of photo-induced halide segregation remain open questions. Here, using a combination of temperature-dependent X-ray diffraction and calorimetry measurements, we report the emergence of a disorder- and frustration-driven orientational glass for a wide range of compositions in CH₃NH₃Pb(Cl _x Br_1-x )₃. Using temperature-dependent photoluminescence measurements, we find a correlation between halide segregation under illumination and local strains from the

SUBMITTER: van de Goor TWJ 

PROVIDER: S-EPMC8287560 | biostudies-literature | 2021 Jul

REPOSITORIES: biostudies-literature