Controlling the Phase Segregation in Mixed Halide Perovskites through Nanocrystal Size.

ABSTRACT: Mixed halide perovskites are one of the promising candidates in developing solar cells and light-emitting diodes (LEDs), among other applications, because of their tunable optical properties. Nonetheless, photoinduced phase segregation, by formation of segregated Br-rich and I-rich domains, limits the overall applicability. We tracked the phase segregation with increasing crystalline size of CsPbBr_3-x I _x and their photoluminescence under continuous-wave laser irradiation (405 nm, 10 mW cm^-2) and observed the occurrence of the phase segregation from the threshold size of 46 ± 7 nm. These results have an outstanding agreement with the diffusion length (45.8 nm) calculated also experimentally from the emission lifetime and segregation rates. Fur

SUBMITTER: Gualdron-Reyes AF 

PROVIDER: S-EPMC6333216 | biostudies-literature | 2019 Jan

REPOSITORIES: biostudies-literature