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Tuning the photovoltaic performances of the terpolymers based on thiophene‐benzene‐thiophene via the modification of alkyl side chains
Author(s) -
Guo Huan,
Shen Tianpei,
Wu Fen,
Hou Rongyan,
Liu Xuxu,
Zhao Bin,
Tan Songting
Publication year - 2016
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.42982
Subject(s) - thiophene , side chain , alkyl , materials science , conjugated system , polymer solar cell , thermal stability , polymer chemistry , benzene , stille reaction , copolymer , polymer , energy conversion efficiency , photochemistry , chemical engineering , organic chemistry , chemistry , optoelectronics , composite material , engineering
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 PC 61 BM exhibited a promising power conversion efficiency of 3.31% without any processing additives. © 2015 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2016 , 133 , 42982.