Premium
Effects of thiophene units on substituted benzothiadiazole and benzodithiophene copolymers for photovoltaic applications
Author(s) -
Ding Ping,
Zou Yingping,
Chu ChengChe,
Xiao Dequan,
Hsu ChainShu
Publication year - 2012
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.36541
Subject(s) - copolymer , materials science , thiophene , polymer chemistry , polymer solar cell , stille reaction , polymerization , conjugated system , styrene , solubility , thermal stability , polythiophene , ethylene oxide , polymer , energy conversion efficiency , conductive polymer , chemistry , organic chemistry , optoelectronics , composite material
Two conjugated copolymers, poly{4,7‐[5,6‐bis(octyloxy)]benzo(c)(1,2,5)thiadiazole‐ alt ‐4,8‐di(2‐ethylhexyloxyl)benzo[1,2‐ b: 3,4‐ b ]dithiophene} ( P1 ) and poly(2‐{5‐[5,6‐bis(octyloxy)‐4‐(thiophen‐2‐yl)benzo(c)(1,2,5)thiadiazol‐7‐yl] thiophen‐2‐yl}‐4,8‐di(2‐ethylhexyloxyl)benzo(1,2‐ b: 3,4‐ b )dithiophene) ( P2 ), composed of benzodithiophene and 5,6‐dioctyloxybenzothiadiazole derivatives with or without thiophene units were synthesized via a Stille cross‐coupling polymerization reaction. These copolymers are promising for applications in bulk heterojunction solar cells because of their good solubility, proper thermal stability, moderate hole mobility, and low band gap. The photovoltaic properties of these copolymers were investigated on the basis of blends of the different polymer/(6,6)‐phenyl‐C 71 ‐butyric acid methyl ester (PC 71 BM) weight ratios under AM1.5G illumination at 100 mW/cm 2 . The device with indium tin oxide/poly(3,4‐ethylene dioxythiophene):poly(styrene sulfonate)/ P2: PC 71 BM (1 : 2 w/w)/Ca/Al gave a relatively better photovoltaic performance with a power conversion efficiency of 1.55%. © 2012 Wiley Periodicals, Inc. J Appl Polym Sci, 2012