High efficiency of 19% for stable perovskite solar cells fabrication under ambient environment using “conductive polymer adhesive”

Abstract

Abstract Fabrication of highly efficient perovskite solar cells (PSCs) under ambient environment is critical to its large-scale preparation and commercialization. However, the perovskite undergoes rapid degradation in moist environment, resulting in a significant decline of device performance. Herein, a novel sodium citrate modified poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate) (abbreviate as SC-PEDOT:PSS) “conductive adhesive”, is introduced into the perovskite to passivate defects, improve crystallization and boost the charge carrier transport properties of perovskite. Therefore, the high-quality perovskite film with large grain sizes and minor blemishes is obtained. As a result, the photovoltaic performance of PSC is greatly improved. The optimized device can achieve an impressive 19.1% power conversion efficiency (PCE) and negligible hysteresis of the photocurrent. Moreover, when the devices are placed under 85% relative humidity (RH) for 14 days in the dark, the normalized PCE of device with SC-PEDOT:PSS can still maintain 82.7%, which is much better than that of the PSC without SC-PEDOT:PSS (8.6%). The present strategy can facilitate development of high efficiency and well stability PSCs under ambient environment for practical applications.