ENHANCEMENT OF THE PHOTOVOLTAIC CONVERSION EFFICIENCY OF COPPER PHTHALOCYANINE THIN-FILM DEVICES BY INCORPORATION OF METAL-CLUSTERS

ITO-copperphthalocyanine-indium sandwich structures have been prepared by thermal evaporation in high vacuum. Different types of metal nanoc lusters have been incorporated at the ITO-copperphthalocyanine interfa ce. Significant differences in the photovoltaic conversion efficiency of the sandwich samples have been established as a function of the exc itation wavelength. Copper clusters have been found to increase the co nversion efficiency by a factor of nearly three for solar illumination . The observed effects are discussed assuming resonant light absorptio n in the metal clusters as the responsible physical mechanism for enha ncement.