Coexistence of light-induced photoluminescence enhancement and quenching in CH₃NH₃PbBr₃ perovskite films.

ABSTRACT: Lead halide perovskites are promising semiconductors for various optoelectronic devices working in a wide photo-excitation density regime. However, photo-induced instability, attributed to illumination-activated mobile ions, has been an obstacle to their application. Herein, we use the time evolution of photoluminescence (PL) to investigate the light illumination effects of CH₃NH₃PbBr₃ perovskite films under relatively high excitation (up to 4.5 W cm^-2). We demonstrate that continuous illumination can lead to both PL enhancement and PL quenching simultaneously, with their weight ratios depending on the excitation density. The experimental data can be well described and interpreted by considering the coexistence of and competition between the phot

SUBMITTER: Lou H 

PROVIDER: S-EPMC9050461 | biostudies-literature | 2020 Mar

REPOSITORIES: biostudies-literature