Alkyl side chain impact on the charge transport and photovoltaic properties of benzodithiophene and diketopyrrolopyrrole-based copolymers

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DOIResolve DOI: http://doi.org/10.1021/jp202996p
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TypeArticle
Journal titleThe journal of physical chemistry. C
Volume115
Issue36
Pages1800218009; # of pages: 8
AbstractTo investigate the side chain effect on the photovoltaic performance of conjugated copolymers with alternating electron push-pull structures , three alternating copolymers (O-HD, BO-BO, and PU-O) of benzodithiophene and dithienyldiketopyrrolopyrrole were designed and synthesized. They were nomenclated based on the side chains on the benzodithiophene (BDT) and the diketopyrrolopyrrole (DPP) units, with are octyl (O) and 2-hexyldecyl (HD); 3-butyloctyl (BO), and 20cutyloctyl (BO): and 3-pentylundecyl (PU) and octyl (O) groups, respectively. The total C number of the side chains in each repeat unit was kept at 48 to control the dilute effect. The solubility, optical, and electrochemical properties, and crystalline structure of the polymers were depended on the combination of these linear or branched alkyl chains. Thin film transistor (TFT) characterization showed that PU-O had the best hole mobility up to 1.6 x 10(to the power of)-3 cm(squared)V(to the power of)-1 s(to the power of)-1. The best photovoltaic performance was observed from O-HD with power conversion efficiency (PCE) up to 4.1%. However, it only showed a modest hole mobility of 3.8 x 10(to the power of)-4 cm(squared) V(to the power of)-1 s(to the power of)-1, about 4-fold lower than PU-O. This dramatically different performance of these polymers for TFT and photovoltaic devices was explained by the interaction at the interface of the polymer electron donor and the PCBM acceptor domains.
Publication date
PublisherAmerican Chemical Society
LanguageEnglish
AffiliationNRC Institute for Chemical Process and Environmental Technology; NRC Institute for Microstructural Sciences; National Research Council Canada
Peer reviewedYes
NRC number52867
NPARC number19335196
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Record identifier2181756e-d68b-47a0-9fe1-f2aca515cab1
Record created2012-01-27
Record modified2016-05-09
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