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Device modeling and simulation of a mechanically stacked CuGaSe/sub 2//Cu(In/sub 1-x/,Ga/sub x/)Se/sub 2/ (CGS/CIGS) tandem solar cell have been carried out in this study. The physical model consists of a ClGS bottom cell with a double graded band-gap profile in the space charge region (SCR) and the backside of the absorber layer and a uniform band-gap CGS top cell. By varying the absorber layer thickness...
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