Interfacial Voids Trigger Carbon-Based, All-Inorganic CsPbIBr2Perovskite Solar Cells with Photovoltage Exceeding 1.33 V

A novel interface design of producing interfacial voids is proposed for CsPbIBr2perovskite solar cells (PSCs), which is free of any extra modification layer.Interfacial voids improve absorption of CsPbIBr2film, reduce saturation current density, and enlarge built-in potential of the PSCs.The PSC yields a superior efficiency of 10.20% with a record-high photovoltage of 1.338 V.