In Situ Ellipsometry Measurements on the Halide Phase Segregation of Mixed Halide Lead Perovskites.

ABSTRACT: Methylammonium lead iodide bromides MAPb(Br_x I_1-x )₃ are a class of mixed halide lead perovskites, materials that offer high-power conversion efficiencies and bandgap tunability. For these reasons, they are a promising absorber material for future solar cells, although their use is still limited due to several factors. The reversible phase segregation under even low light intensities is one of them, lowering the effective bandgap due to local segregation into iodide-rich and bromide-rich phases. While several studies have been done to illuminate the mechanism and suppression of phase segregation, challenges remain to understand its kinetics. We obtained dynamic ellipsometric measurements from x=0.5 mixed halide lead perovskite thin films protected by a poly

SUBMITTER: Bernhardt A 

PROVIDER: S-EPMC9401859 | biostudies-literature | 2022 Aug

REPOSITORIES: biostudies-literature