Abstract
The lateral photovoltaic effect has been observed in CdS-Cu2S thin-film solar cells. The effect is more pronounced on the CdS side than on the Cu2S side of the cells. On the CdS side, where the contacts were formed by soldering Cu wire by indium and then applying Ag paint, the photovoltage developed were found to increase as the point of illumination was moved towards the contact. The spectral response of photovoltage for coevaporated cells shows a peak atλ=0.5μm (2.45 eV). But for topotaxial cells two peaks, one atλ=0.5μm and the other atλ=0.65μm (1.89eV) were observed. A band model has been proposed for the heat-treated optimized cells.
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