Abstract
ITO-copperphthalocyanine-indium sandwich structures have been prepared by thermal evaporation in high vacuum. Different types of metal nanoclusters have been incorporated at the ITO-copperphthalocyanine interface. Significant differences in the photovoltaic conversion efficiency of the sandwich samples have been established as a function of the excitation wavelength. Copper clusters have been found to increase the conversion efficiency by a factor of nearly three for solar illumination. The observed effects are discussed assuming resonant light absorption in the metal clusters as the responsible physical mechanism for enhancement.
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