This article will concentrate mostly on a similarity of the effectiveness of multi-layer GaAs solar cells (2,3,5 layer). The effectiveness of multi-layer solar cell is dependent on a variety of design factors, including the kind of material used, the thickness of the layers, the concentration of doping, the type of texturing employed, as well as the thicknesses of the anti-reflective coatings. The performance of one-dimensional solar cells was analyzed using PC1D (personal computer in one dimension), a piece of software that mimics one-dimensional solar cells. PC1D's Batch mode permits the execution of parameter-specific optimization studies. Computer modeling in PC1D reveals the accessible voltage, short-circuit current, voltage-level threshold, and conversion efficiency of power for a single sun, AM1.5G solar radiation, and a constant intensity of 0.1w/cm2.