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Several different II-VI heterojunctions show possible promise for photovoltaic conversion of solar energy. Two of these are p-CdTe/n-CdS and p-CdTe/n-Zn0.35Cd0.65S, which have a maximum solar efficiency of 17 and 23%, respectively. We report here specifically on the properties of p-CdTe/n-CdS cells prepared (a) by close-spaced vapor transport of CdTe onto single-crystal CdS, and (b) by two-source vacuum evaporation of CdS onto single-crystal CdTe. Cells with efficiency of 4.0% have been produced without detailed attention to optimization of cell design; these cells have quantum efficiencies as high as 0.85.
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Fahrenbruch et al. (1974) studied this question.
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