Five-Ring Fused Tetracyanothienoquinoids as High-Performance and Solution-Processable n-Channel Organic Semiconductors: Effect of the Branching Position of Alkyl Chains

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• 作者：Jie Li ; Xiaolan Qiao ; Yu Xiong ; Hongxiang Li ; Daoben Zhu
• 刊名：Chemistry of Materials
• 出版年：2014
• 出版时间：October 14, 2014
• 年：2014
• 卷：26
• 期：19
• 页码：5782-5788
• 全文大小：374K
• ISSN：1520-5002

文摘

Dicyanomethylene-substituted quinoidal dithieno[2,3-d;2鈥?3鈥?d鈥瞉benzo[1,2-b;4,5-b鈥瞉dithiophene compounds (QDTBDTs) with alkyl chains branched at different positions were synthesized. Thin-film transistor characteristics showed that the type of charge carriers in QDTBDTs could be tuned by changing the branching position of the alkyl chains. QDTBDT-2C exhibited n-channel behavior, and the observed electron mobility was 0.57 cm² V^鈥? s^鈥? without post-treatment, one of the highest values reported for spin-coated thin-film transistors with no annealing under ambient conditions. QDTBDT-4C-based transistors displayed electron-dominated ambipolar transport behavior, with electron mobilities reaching 0.2 cm² V^鈥? s^鈥? and hole mobilities in the range of 10^鈥?鈥?0^鈥? cm² V^鈥? s^鈥?. QDTBDT-3C showed solution-concentration-dependent carrier transport characteristics, exhibiting n-type behavior at low solution concentrations and ambipolar performance at high solution concentrations with an electron mobility of 0.22 cm² V^鈥? s^鈥? and a hole mobility of 0.034 cm² V^鈥? s^鈥?. CMOS-like inverters fabricated from QDTBDT-2C displayed high gain and high noise margins.