<i>p</i>‐Type Charge Transfer Doping of Graphene Oxide with (NiCo)<sub>1−<i>y</i></sub>Fe<sub><i>y</i></sub>O<sub><i>x</i></sub> for Air‐Stable, All‐Inorganic CsPbIBr<sub>2</sub> Perovskite Solar Cells
Jian Du, Jialong Duan, Xiya Yang, Yanyan Duan, Quanzhu Zhou, Qunwei Tang
Abstract
Abstract The precise regulation of interfacial charge distribution highly determines the power conversion efficiency of perovskite solar cells (PSCs). Herein, inorganic (NiCo) 1− y Fe y O x nanoparticle decorated graphene oxide (GO) is successfully demonstrated as a hole booster for all‐inorganic CsPbIBr 2 PSC free of precious metal electrode. Arising from the spontaneous electron transfer induced p ‐type doping of GO from edged oxygen‐containing functional groups to (NiCo) 1− y Fe y O x , the best all‐inorganic CsPbIBr 2 PSC achieves an efficiency of 10.95 % under one standard sun owing to the eliminated paradox between charge extraction and charge localization in GO surface. Furthermore, the champion device exhibits an excellent long‐term stability at 10 % relative humidity without encapsulation over 70 days because of the suppressed ions migration.