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In this article the Wells-Dawson polyoxometalate K6[P2W18O62] is grown as aninterfacial layer between indium tin oxide and bulk heterojunction ofpoly(3-hexylthiophene) (P3HT) and [6,6]-phenyl-C61-butyric acid methyl ester(PCBM). The structure of the POM layers depends on the thickness and shows ahighly anisotropic surface organization. The films have been characterized byatomic force microscopy and X-ray photoelectron spectroscopy (XPS) to gaininsight into their macroscopic organization and better understand theirelectronic properties. Then, they were put at the anodic interface of aP3HT:PCBM organic solar cell and characterized on an optical bench. Thephotovoltaic efficiency is discussed in terms of the benefit of thepolyoxometalate at the anodic interface of an organic photovoltaic cell.

Enhancement of photovoltaic efficiency by insertion of a polyoxometalate layer at the anode of an organic solar cell