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Hole transport layer (HTL)‐free carbon‐based perovskite solar cells (C‐PSCs) show promising commercial application potential due to their attractive advantages of low cost and high stability. However, the power conversion efficiency of C‐PSCs is relatively low, mainly due to the poor crystalline quality of the C‐PSC applicable perovskite films and the energy level mismatch between the perovskite and...
Large energy loss (Eloss) caused by defect‐assisted recombination makes the photovoltaic performance of carbon‐based perovskite solar cells (C‐PSCs) inferior to that of metal‐electrode ones. Herein, the influence of environmental factors (moisture and oxygen) on defect management during re‐annealing process of CsPbI2Br crystalline films is systematically studied. Density functional theory and experimental...