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The electronic and materials properties of two series of wide-bandgap solar cells with Cupoor CuGaSe 2 (CGS) absorbers have been studied, to better understand limitations on the device performance. One series of samples displayed distinct lateral non-uniformities in Cu/Ga ratio, Na content, and thickness. The C-V data on these samples suggested the presence of a distinct band of near-interface defect states. Although the second series of samples appeared uniform and C-V results did not indicate the presence of near-interface defect states, J-V-T results show V oc (0T)

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