Fast oxygen diffusion and iodide defects mediate oxygen-induced degradation of perovskite solar cells.

ABSTRACT: Methylammonium lead halide perovskites are attracting intense interest as promising materials for next-generation solar cells, but serious issues related to long-term stability need to be addressed. Perovskite films based on CH₃NH₃PbI₃ undergo rapid degradation when exposed to oxygen and light. Here, we report mechanistic insights into this oxygen-induced photodegradation from a range of experimental and computational techniques. We find fast oxygen diffusion into CH₃NH₃PbI₃ films is accompanied by photo-induced formation of highly reactive superoxide species. Perovskite films composed of small crystallites show higher yields of superoxide and lower stability. Ab initio simulations indicate that iodide vacancies are the pref

SUBMITTER: Aristidou N 

PROVIDER: S-EPMC5437277 | biostudies-literature | 2017 May

REPOSITORIES: biostudies-literature