A review: strategies for reducing the open-circuit voltage loss of wide-bandgap perovskite solar cells

Perovskite-based tandem solar cells (PTSCs) have made remarkable achievements in recent years, and the highest certified power conversion efficiency (PCE) of 33.9% has been achieved in perovskite/silicon tandem solar cells (PSTSCs), indicating their great commercialization potential. Nevertheless, the performance of PTSCs continues to be hindered by the compromised performance of wide-bandgap perovskite solar cells (WPSCs), particularly the high V_OC deficit of WPSCs. Therefore, numerous strategies have been developed to minimize the V_OC loss of WPSCs. Herein, we sort to comprehensively review about the reported studies on reducing the V_OC deficit of WPSCs, focusing on interface modification, charge transport material (CTM) exploration, and additive engineering, with the aim of providing guidelines for increasing the V_OC of WPSCs. Finally, we will provide a conclusive outlook on WPSCs, sharing our perspectives to inspire further advancements in both WPSCs and PTSCs.