Defect‐Passivation Using Organic Dyes for Enhanced Efficiency and Stability of Perovskite Solar Cells. Issue 5 (29th January 2020) - Xiong, Shaobing
Abstract : Perovskite solar cells are a highly competitive candidate for next‐generation photovoltaic technology. Defects in the perovskite grain boundaries and on the film surfaces however have significant impacts on both the device efficiency and environmental stability. Herein, a strategy using organic dyes as additives to passivate the defect states and produce more n‐type perovskite films, thereby improving charge transport and decreasing charge recombination, is reported. Based on this strategy, the power conversion efficiency of the perovskite solar cell is significantly increased from 18.13% to 20.18% with a negligible hysteresis. Furthermore, the rich hydrogen bonds and carbonyl structures in the organic dye can significantly enhance device stability both in terms of humidity and thermal stress. The results present a promising pathway using abundant and colorful organic dyes as additives to achieve high‐performance perovskite solar cells. Abstract : A new strategy using an abundant and colorful organic dye as the additive to passivate defect states and to produce more n‐type perovskite film is proposed, which remarkably enhances both efficiency and humidity/thermal stability of the perovskite solar cells.