Synthesis of Copolymers Based on Thiazolothiazole and Their Applications in Polymer Solar Cells

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• 作者：Qinqin Shi ; Haijun Fan ; Yao Liu ; Wenping Hu ; Yongfang Li ; Xiaowei Zhan
• 刊名：Journal of Physical Chemistry C
• 出版年：2010
• 出版时间：October 7, 2010
• 年：2010
• 卷：114
• 期：39
• 页码：16843-16848
• 全文大小：263K
• 年卷期：v.114,no.39(October 7, 2010)
• ISSN：1932-7455

文摘

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 × 10⁻³ cm² V⁻¹ s⁻¹, which is 1 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.