SEXITHIOPHENE-C-60 BLENDS AS MODEL SYSTEMS FOR PHOTOVOLTAIC DEVICES

Large photovoltaic responses have been recently observed in devices ba sed on donor-acceptor blends. Their enhanced performance, which relies on the formation of a bicontinuous network of internal heterojunction s, is very sensitive to the morphology of the blend. In this paper, we propose sexithiophene-C-60 blends, prepared by coevaporation, as a mo del system for the study of these devices. Preliminary results suggest a microphase-separated morphology with a domain size comparable to th e exciton diffusion range. Photovoltaic cells based on the blends are demonstrated.