Abstract
Choosing FA+/MA+ mixed-ion perovskite material as the active layer of the perovskite solar cells hold out the prospect of high efficiency and high stability. In this paper, the FA+/MA + ratio is modified to optimize the performance of FAxMA1-xPbI3-based perovskite solar cells utilizing SCAPS-1D. The results indicate that the PCE of the devices reached a minimum of 21 % when x is greater than or equal to 0.6 in FAxMA1-xPbI3(FTO/NiOx/FAxMA1-xPbI3/C60/BCP/Al). When x = 0.6, the impact of the bottom interface defects on the solar cell performance is dominant and the thickness of the active layer should be controlled within a range of 0.4 μm–0.8 μm, while the defect density of the layer is expected to be between 1013 1/cm3 and 1014 1/cm3. By optimizing the perovskite layer thickness, defect density and changing the type of back electrode material, the efficiency is reaching 25.74 % based on the device(FTO/NiOx/FA6MA4PbI3/C60/BCP/Au). This study provides theoretical guidance for experimental research on interface modification, defect passivation and manufacturing of high-efficiency FAxMA1-xPbI3-based perovskite solar cells.
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