Two-Stage Ultraviolet Degradation of Perovskite Solar Cells Induced by the Oxygen Vacancy-Ti⁴⁺ States.

ABSTRACT: The failure of perovskite solar cells (PSCs) under ultraviolet (UV) irradiation is a serious barrier of commercial utilization. Here, a two-stage degradation process of TiO₂-based PSCs is discovered under continuous UV irradiation in an inert atmosphere. In the first decay stage, oxygen vacancy-Ti³⁺ (Ti³⁺-V_O) transform into active Ti⁴⁺-V_O trap states under UV excitation and cause photocarrier loss. Furthermore, Ti⁴⁺-V_O states can convert back into Ti³⁺-V_O states through oxidizing I^-, which result in the accumulation of I₃^-. Sequentially, the rapid decomposition of perovskite accelerated by increasing I₃^- replaces the photocarri

SUBMITTER: Ji J 

PROVIDER: S-EPMC7160572 | biostudies-literature | 2020 Apr

REPOSITORIES: biostudies-literature