Proceedings of 6th International Conference on Hybrid and Organic Photovoltaics (HOPV14)
Publication date: 1st March 2014
Two conjugated donor-acceptor copolymers based on benzodithiophene donor unit and a fluorinated quinoxaline acceptor unit, spaced with either thiophene or thieno[3,2-b]thiophene p-bridges, were synthesized and characterized. The effect of different p-bridges and of the processing conditions on optical, electrical, morphological and photovoltaic properties of the polymer:fullerene blend films are reported. This allows to compare the properties of the two polymers on the basis of the different p-spacer nature. The polymer containing the thieno[3,2-b]thiophene p-bridge (PBDTFQ-TT) showed a red-shifted absorption and an enhanced charge carrier mobility, as compared to its analogue with the thiophene p-bridge (PBDTFQ-T). Solution-processed BHJ solar cells, using PBDTFQ-TT and PBDTFQ-T polymers as donor materials and PCBM as electron acceptor counterpart, were fabricated in air by blade-coating technique. Similar power converion efficiencies (PCEs), greater than 5%, were achieved for both polymers by tuning the processing conditions.
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