SIMULTANEOUS EFFECT OF SDL AND MOSE2 LAYERS ON CIGS SOLAR CELL PERFORMANCE AND STRATEGY FOR IMPROVING ULTRA-THIN CIGS SOLAR CELL PERFORMANCE

In this paper, based on numerical simulation, the SCAPS-1D software was used to simultaneously study the influence of the surface defect  layer (SDL) and the molybdenum diselenide layer (MoSe₂) on the performance of the CIGS solar cell. These two defects layers are respectively formed at the front interface (CdS/CIGS) and the back interface (CIGS/ Mo) by atomic inter-diffusion. Simultaneous analysis of SDL and MoSe₂ layers thickness revealed that optimum performance is achieved for 10 nm thickness of SDL layer and 35 nm thickness of MoSe₂. A study of the gap energy revealed that optimum performance is obtained for 1.25 eV energy gap SDL layer and 1.35 eV energy gap of MoSe₂ layer. Next, a performance study of the ultra-thin CIGS solar cell with optimized SDL and MoSe₂ layers was carried out. It was found that the presence of the SDL and MoSe₂ layers optimized improves the electrical performance of the ultra-thin CIGS solar cell.