Indium-tin-oxide (ITO)/selenium heterojunction solar cells with AM 1 conversion efficiencies as high as 3.3% have been fabricated by vacuum deposition. These cells have extremely high spectral response at short wavelengths, resulting in an efficiency of 6.5% under fluorescent light. The photovoltaic performance strongly depends upon the layer thickness of selenium (0.5∼10 µm) and of tellurium (0∼55Å) which is interposed to provide a sufficient mechanical bond between the oxide and selenium layers.
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Nakada et al. (1984) studied this question.
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