Diketopyrrolopyrrole-Based 蟺-Conjugated Copolymer Containing 尾-Unsubstituted Quintetthiophene Unit: A Promising Material Exhibiting High Hole-Mobility for Organic Thin-Film Transistors

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• 作者：Zhengran Yi ; Xiangnan Sun ; Yan Zhao ; Yunlong Guo ; Xingguo Chen ; Jingui Qin ; Gui Yu ; Yunqi Liu
• 刊名：Chemistry of Materials
• 出版年：2012
• 出版时间：November 27, 2012
• 年：2012
• 卷：24
• 期：22
• 页码：4350-4356
• 全文大小：369K
• 年卷期：v.24,no.22(November 27, 2012)
• ISSN：1520-5002

文摘

A new diketopyrrolopyrrole-based 蟺-conjugated copolymer (PDPP5T) with high molecular weight has been synthesized by Stille coupling polymerization of 3,6-bis(5-bromothiophen-2-yl)-2,5-bis(2-octyldodecyl)pyrrolo-[3,4-c]pyrrole-1,4(2H,5H)-dione with 伪,伪鈥?bis(trimethylstannyl)-terthiophene. Its hole mobility without thermal annealing reaches 1.08 cm² V^鈥? s^鈥?, and a higher hole mobility of 3.46 cm² V^鈥? s^鈥? is obtained annealed at 200 掳C directly in an air atmosphere. This indicates that introducing a longer 尾-unsubstituted quinquethiophene (5T) unit into the main-chain of DPP-oligothiophene copolymer produces much pronounced p-type behavior and also reduces the steric hindrance of the bulk side-chain groups, which is favorable to enhance the molecular ordering capability at low temperatures and improve the organic thin-film transistors (OTFT) performances. This work demonstrates that PDPP5T is a promising material that can be applied to the cost-effective and large-scale production of OTFTs.

Keywords:

donor鈭抋cceptor copolymer; organic thin-film transistors; hole mobility