A new diketopyrrolopyrrole-based π-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 α,α′-bis(trimethylstannyl)-terthiophene. Its hole mobility without thermal annealing reaches 1.08 cm² V^–1 s^–1, and a higher hole mobility of 3.46 cm² V^–1 s^–1 is obtained annealed at 200 °C directly in an air atmosphere. This indicates that introducing a longer β-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.

中文翻译：

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含β-未取代的喹硫噻吩单元的基于二酮吡咯并吡咯的π共轭共聚物：有机薄膜晶体管具有高空穴迁移率的有前途的材料

通过3,6-双（5-溴噻吩-2-基）-2,5-双（2-辛基十二烷基）吡咯的Stille偶联聚合反应合成了一种新的高分子量二酮吡咯并吡咯基π-共轭共聚物（PDPP5T）。 -[3，4-c]吡咯-1，4（2H，5H）-二酮与α，α′-双（三甲基锡烷基）-对噻吩。未经热退火的空穴迁移率达到1.08 cm ² V ^–1 s ^–1，更高的空穴迁移率达到3.46 cm ² V ^–1 s ^–1直接在空气气氛中于200°C退火得到。这表明在DPP-低聚噻吩共聚物的主链中引入更长的β-未取代的喹噻吩（5T）单元会产生明显的p型行为，并减少本体侧链基团的空间位阻，有利于增强低温下的分子有序能力，并改善了有机薄膜晶体管（OTFT）的性能。这项工作表明，PDPP5T是一种很有前途的材料，可用于经济高效地大规模生产OTFT。