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  • Chuanxiao Xiao; Chun-Sheng Jiang; Weijun Ke; Changlei Wang; Gorman, Brian; Yanfa Yan; Al-Jassim, Mowafak

    2016 IEEE 43rd Photovoltaic Specialists Conference (PVSC), 2016-June
    Conference Proceeding

    We used Kelvin probe force microscopy to study the potential distribution on cross-section of perovskite solar cells with different types of electron-transporting layers (ETLs). Our results explain the low open-circuit voltage and fill factor in ETL-free cells, and support the fact that intrinsic SnO 2 as an alternative ETL material can make high-performance devices. Furthermore, the potential-profiling results indicate a reduction in junction-interface recombination by the optimized SnO 2 layer and adding a fullerene layer, which is consistent with the improved device performance and current-voltage hysteresis.