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In this paper we conduct numerical simulation of CdS/CIGS solar cells by useof the AMPS-1D software aiming to formulate the optimal design of the newmulti-junction tandem solar cell providing its most efficient operation. Westart with the numerical simulation of single-junction CdS/CIGS solar cells,which shows that its highest efficiency of 17.3% could be achieved by thethickness of CIGS p-layer of 200 nm. This result is in a good agreement withexperimental data where the highest efficiency was 17.1% with the solar cellthickness of 1 micron. By use of the results of the numerical simulation of thesingle-junction solar cells we developed the design and conducted optimizationof the new multi-junction tandem CdS/CIGS solar cell structure. Numericalsimulation shows that the maximum efficiency of this solar cell is equal to48.3%, which could be obtained with the thickness of the CIGS p-layer of 600 nmat a standard illumination of AM 1.5.

Simulation of the Efficiency of CdS/CIGS Tandem Multi-Junction Solar Cells Using AMPS-1D