Heterojunction Energy Band Lineups in Cd1-x ZnxS/Cu2S Solar Cells
We present a study of the heterojunction energy band lineups in Cd1-xZnxS/Cu2S Photovoltaic cells. The values of the Cd1-xZxZnxs gap Eg(x) are calculated using the Van Vechten-Phillips model with the virtual crystal approximation. Good agreement has been obtained between experimental values and this calculation. The effect of disorder has been estimated and seems to contribute little to Eg(x). The heterojunction energy band lineups have been calculated using the LCAO model of Harrison-Chadi. The zinc concentration at which ΔEC=0 is about 40% neglecting changes in the dipole contribution to ΔEc, and 20% when the dipole contribution is included; the experimental value is about 30%.
KeywordsZinc Recombination CdZn ECSC
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