Abstract
Chloride (from PbCl2 or CH3NH3Cl) has been reported to improve the morphology of perovskite thin film and power conversion efficiency (PCE) of corresponding perovskite solar cells (PSCs). However, the mechanism why chloride functions well in perovskite is unclear. In this work, we investigate the effects of chloric additive (from CH3NH3Cl) on the morphology, diffusion length, and trap state of perovskite thin film, as well as the PCE of PSC. We find that the chloric additive can significantly increase the hole and electron diffusion length and also reduce the bulk trap-state density in perovskite thin film, which is considered to be the main reason for improving the performance of PSC. These results contribute to better understanding of the function of chloride in perovskite and suggest room to further improve the PCE of PSC via decreasing the trap state in perovskite film.
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