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In view of increasing global energy demand and finite resources of fossil fuels, photovoltaic devices are receiving a great deal of attention. Solution-processable organic semiconductors represent a promising class of new organic photovoltaic (OPV) materials with potential for low manufacturing costs and applications ranging from flexible and mobile devices to large-area installations.[1] In the best devices constructed to date based on solution-processed organic materials, interpenetrating networks of soluble n-type semiconducting fullerenes such as [6, 6]-phenyl-C61-butyric acid methyl ester (PCBM) as electron acceptor and p-type semiconducting polymers such as poly (3-hexylthiophene)(P3HT) as electron donor moiety form the active interfaces. Such bulk heterojunction (BHJ) OPV cells have reached power conversion efficiencies (PCEs) of up to 6%.[2] Despite their still lower PCE of around 4%, solution …