Journal
JOURNAL OF PHYSICAL CHEMISTRY C
Volume 114, Issue 39, Pages 16843-16848Publisher
AMER CHEMICAL SOC
DOI: 10.1021/jp106319x
Keywords
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Funding
- Ministry of Science and Technology of China [2006CB932100, 2006AA03Z220]
- National Natural Science Foundation of China [20774104, 51011130028, 50633050, 20721061]
- Chinese Academy of Sciences
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Two conjugated alternating copolymers of thiazolothiazole with benzodithiophene (P1) or bithiazole (P2) were synthesized by a palladium(0)-catalyzed Stille coupling reaction. The thermal, electrochemical, optical, charge transport, and photovoltaic properties of these copolymers were examined. Compared with P1, P2 exhibits red shifted absorption, a lower band gap, and a lower HOMO level. The field-effect hole mobility of P1 is as high as 2.8 x 10(-3) cm(2) V-1 s(-1), which is I order of magnitude higher than that of P2. Polymer solar cells were fabricated based on the blend of the polymers and methanofullerene[6,6]-phenyl C61-butyric acid methyl ester (PC61BM). The PSC based on P1:PC61BM (1:2, w/w) exhibits a power conversion efficiency of 2.72% under AM 1.5, 100 mW cm(-2), higher than that reported for the thiazolothiazole-based polymers in the literature.
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