Huan Guo, Tianpei Shen, Fen Wu
Feb 10, 2016
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Journal
Journal of Applied Polymer Science
Abstract
Three new random conjugated terpolymers based on thiophene-2,5-bis((2- ethylhexyl)oxy)benzene-thiophene or thiophene-2,5-bis((2-octyl)oxy)benzene- thiophene as electron-donating units, diketopyrrolopyrrole (DPP) and 4,7-dithien-5-yl-2,1,3-benzothiadiazole (DTBT) side group as electron-withdrawing units have been designed and synthesized by Stille-coupling reaction. All the terpolymers exhibit good thermal stability, broad absorption in the range of 300 to 800 nm. By tuning the alkyl side chains of the terpolymers, the absorption spectra, HOMO energy levels and photovoltaic properties of the terpolymers changed dramatically. A bulk heterojunction polymer solar cell fabricated from terpolymer GP2 and PC61BM exhibited a promising power conversion efficiency of 3.31% without any processing additives. © 2015 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2016, 133, 42982.