Light Intensity-dependent Variation in Defect Contributions to Charge Transport and Recombination in a Planar MAPbI₃ Perovskite Solar Cell.

ABSTRACT: We investigated operation of a planar MAPbI₃ solar cell with respect to intensity variation ranging from 0.01 to 1 sun. Measured J-V curves consisted of space-charge-limited currents (SCLC) in a drift-dominant range and diode-like currents in a diffusion-dominant range. The variation of power-law exponent of SCLC showed that charge trapping by defects diminished as intensity increased, and that drift currents became eventually almost ohmic. Diode-like currents were analysed using a modified Shockley-equation model, the validity of which was confirmed by comparing measured and estimated open-circuit voltages. Intensity dependence of ideality factor led us to the conclusion that there were two other types of defects that contributed mostly as recombination centers. At low intensit

SUBMITTER: Ryu S 

PROVIDER: S-EPMC6934867 | biostudies-literature | 2019 Dec

REPOSITORIES: biostudies-literature