In this study design and optimization of a-S:H /c-Si heterojunction solar cell was done with AFORS-HET simulation program. Detailed simulation studies of I-V characterization of solar cells have been carried out with TCO/ (n) a-Si:H/ (i) a-Si:H/ (p) c-Si/BSF/Ag structure. Back surface field (BSF) layer created with (p+) a-Si:H layers. Various efforts such as changes in thicknesses, and doping concentrations of all layers, the quality of amorphous layer have been done to achieve higher

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... . The results of these simulation studies have been obtained to be in a good agreement with the reported studies in the literature, and it is possible to propose some design parameters for HIT cell fabrication.