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Yujuan Nie, Bin Zhao, Peng Tang, Peng Jiang, Zongfang Tian, Ping Shen and Songting Tan Synthesis and photovoltaic properties of copolymers based on benzo[1,2-b:4,5-b′]dithiophene and thiophene with electron-withdrawing side chains Journal of Polymer Science Part A: Polymer Chemistry 49

Version of Record online: 14 JUN 2011 | DOI: 10.1002/pola.24799

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Six alternating conjugated copolymers, comprised of benzo[1,2-b: 4,5-b0] dithiophene (BDT) and thiophene derivatives with/without electron-withdrawing side chains, were designed and synthesized. The introduction of conjugated electron-withdrawing oxadiazole or butyl formate side chain benefits to decrease the bandgaps of the polymers and improve the photovoltaic performance. Under the illumination of AM 1.5, 100 mW/cm2, the photovoltaic cells based on the polymers of PL3 and PL5 exhibit the power conversion efficiencies of 1.98 and 2.06%, respectively.

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