Efficient Perovskite Solar Cells with Reduced Photocurrent Hysteresis through Tuned Crystallinity of Hybrid Perovskite Thin Films

Hybrid perovskite materials used for realization of efficient perovskite solar cells have drawn great attention in both academic and industrial sectors. It was reported that the crystallinity of hybrid thin-film perovskite materials plays an important role in device performance. In this study, we report a novel and simple method to tune the crystallinity of CH 3 NH 3 PbI 3 thin film for device performance of perovskite solar cells. By employing tetraphenylphosphonium chloride on the top of PbI 2 thin layer in the two-step perovskite deposition processes, the crystallinity of the resultant CH 3 NH 3 PbI 3 thin film was tuned. As a result, perovskite solar cells by the CH 3 NH 3 PbI 3 thin film with tuned crystallinity exhibit an enlarged open-circuit voltage and enhanced short-circuit current, thus boosted efficiency as well as reduced photocurrent hysteresis compared to pristine CH 3 NH 3 PbI 3 thin film. These results indicate that our study provides a new simple way to boost device performance of perovskite solar cells through tuning the crystallinity of CH 3 NH 3 PbI 3 thin film.