Abstract
Abstract In perovskite solar cells, the interface plays a critically important role in photovoltaic performance as the exciton dissociation and recombination occur here. In this report, In2O3 is developed as an efficient interlayer between TiO2 electron-transporting layer and perovskite light-absorption layer in planar perovskite solar cells. The modification of In2O3 interlayer results in a superb enhancement in average power conversion efficiency (from 16.71% to 18.93%). Meanwhile, the hysteresis phenomenon gets prominently improved. Based on this background, some other characterizations are performed. The results reveal that the improved photovoltaic performance through depositing In2O3 interlayer can be ascribed to better film morphology, decreased recombination center, improved conductivity, reduced trap-state density and enhanced electron extraction capacity. This study demonstrates that In2O3 can be an efficient interfacial material for TiO2-based perovskite solar cells.
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