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https://pure.psu.edu/en/publications/enhanced-efficiency-of-graded-bandgap-thin-film-solar-cells-due-t/
AB - A systematic study was performed with a coupled optoelectronic model to examine the effect of the concentration of sunlight on the efficiencies of CIGS, CZTSSe and AlGaAs thin-film solar cells with a graded-bandgap absorber layer