Mapping the photocurrent and photovoltage of hybrid perovskite thin films under concentrated sunlight

In this work, we study spatially resolved generation of photocurrent and photovoltage of mesoporous PbI₂ scaffolds CH₃NH₃PbI₃ perovskite film with and without polyaniline (PANI) to reveal the microscopic effects of material degradation under concentrated sunlight. The degradation in absorption of CH₃NH₃PbI₃ film after exposure to concentrated sunlight is mainly due to the decomposition of perovskite, and no degradation was observed for PANI-CH₃NH₃PbI₃ film. Direct measurement of photocurrent and photovoltage have been investigated for PbI₂ scaffold perovskite films at the nanoscale. These results reveal substantial variation in the photocurrent and photovoltage that correlated with the microstructural features of the perovskite film with degradation under concentrated sunlight.

Schematic diagram of the CAFM and KPFM measurements and corresponding current and CPD maps.