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이기백,김윤희,김란,차효정,박찬언,김진학 한국고분자학회 2014 Macromolecular Research Vol.22 No.5
A new copolymer (PONTET), composed of dialkoxy napthalene as donor and a carbonylated thieno[3,4-b]thiophene group as an acceptor, was obtained by Suzuki coupling polymerization. The number averagemolecular weight (Mn) of PONTET is 6.4 kg mol-1 with a polydispersity index of 1.20, determined by gel permeationchromatography using chloroform. PONTET showed broad absorption with a maximum at 534 nm in solutionand 618 nm in a thin film, respectively. The hole mobility of PONTET was 1.5×10-3 cm2/Vs and the Ion/Ioff ratiowas 7.7×104. The maximum power conversion efficiency of a PONTET:PC70BM (1:4)-based solar cell reached 1.3%with an open circuit voltage (Voc) of 0.56 V, a short circuit current density (Jsc) of 5.6 mA/cm2, and a fill factor (FF) of41.3%.