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Kangli Cao, Zhongwei Wu, Shugang Li, Baoquan Sun, Guobing Zhang and Qing Zhang A low bandgap polymer based on isoindigo and bis(dialkylthienyl)benzodithiophene for organic photovoltaic applications Journal of Polymer Science Part A: Polymer Chemistry 51

Version of Record online: 14 AUG 2012 | DOI: 10.1002/pola.26275

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A new low bandgap polymer PBDTT-ID based on isoindigo and bis(2,3-dialkylthienyl) substituted benzo[1,2-b:4,5-b′]dithiophene has been synthesized. A power conversion efficiency of 4.02%, an Voc of 0.94 V, a FF of 50%, and a Jsc of 8.55 mA cm-2 have been achieved in polymer solar cell devices with the polymer as donor and PC61BM as acceptor under the illumination of air mass (AM) 1.5G, 100 mW cm−2.

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