We have prepared heterojunction devices based on ZnO and both pentacene single crystals and thin films. Their photovoltaic properties have been studied. Bromine doping is found to improve significantly the performance of such devices and solar-energy conversion efficiencies up to 4.5% are achieved for single-crystal devices. In addition, efficiencies exceeding 2% are realized in thin-film devices on flexible plastic substrates. These results demonstrate that efficient photovoltaic energy conversion is possible with organic semiconductors.

Topics
Heterostructures, Organic semiconductors, Semiconductor devices, Energy conversion, Photovoltaics, Thin film devices
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