Computational design of high efficiency a-Si:H/CIGS monolithic tandem solar cell

In this work, we investigate numerical simulations of single junction hydrogenated amorphous silicon solar cells (a-Si:H), Cu (In, Ga) Se2 (CIGS) solar cells, and tandem solar cells with a-Si:H as the top cell and (CIGS) as the bottom cell using an advanced semiconductor analysis program. The optical bandgaps and thicknesses of the tandem solar cell were studied to optimize current matching. The tunnel-recombinaton (TJ) junctions were studied with different structures. The optimal structure was investigated using the optimal TJ junction, which consists of p-type microcrystalline silicon, n-type nanocrystalline silicon and AZO. The characteristics of the optimal a-Si:H/CIGS solar cell were a short circuit current density of 17.57 mA/cm2, and an open circuit voltage of 1.67 V. These results can be used as a basis for effectively developing low-cost and high-efficiency solar cells.