The Effect of Change the Thickness on CdS/CdTe Tandem Multi-Junction Solar Cells Efficiency

Researchers in the field of simulation have been mainly interested in the question of how to increase the efficiency of solar cells. Therefore this study aimed to investigate CdS/CdTe solar cells by applying AMPS-1D software. The impact of semiconductor layers thickness on the output parameters of the CdS/CdTe solar cell is being analyzed and studied carefully, for example, fill factor, efficiency, the density of short-circuit current and open circuit voltage. To acquire the most efficiency estimation, a new tandem multi-junction structure is intended by using two solar cells connected back to back with each other and designed based on the results gained from the singlejunction solar cells. Numerical simulations demonstrated that the highest CdS/CdTe efficiency is 31.8% which can be achieved whenever the p-CdS layer thickness is equal to 50 nm, and the n-CdS layer thickness is equal to 200 nm, while the thicknesses of the n-CdTe layer and p-CdTe layer are kept fixed equal to 3000 nm and 1000 nm, respectively.