Effect of the Longer β-Unsubstituted Oliogothiophene Unit (6T and 7T) on the Organic Thin-Film Transistor Performances of Diketopyrrolopyrrole-Oliogothiophene Copolymers
作者:Zhengran Yi、Lanchao Ma、Bing Chen、Dugang Chen、Xingguo Chen、Jingui Qin、Xiaowei Zhan、Yunqi Liu、Wen Jie Ong、Jun Li
DOI:10.1021/cm402381w
日期:2013.11.12
oliogothiophene unit in DPP-based copolymers has a great influence on the molecular weight and solubility of the DPP-oligothiophene copolymers that finally affects the organic thin-film transistor (OTFT) performances, indicating that a suitable number of thiophene group in β-unsubstituted oligothiophene exists for such a kind of copolymer to exhibit the best OTFT performances. This work also reveals the
通过3,6-双(5'-溴-[2,2'-联噻吩] -5-基)-2,5的Stille偶联聚合反应合成了两种基于二酮吡咯并吡咯的π共轭共聚物(PDPP6T和PDPP7T)。 -双(2-辛基十二烷基)吡咯并[[3,4-c]吡咯-1,4(2H,5H)-二酮与α,α'-双(三甲基锡烷基)-联噻吩和α,α'-双(三甲基锡烷基) -对噻吩。具有六噻吩并噻吩(6T)的聚合物令人印象深刻的高迁移率是3.94 cm 2 V –1 s –1和2.82 cm 2 V –1 s –1获得具有七硫代噻吩(7T)的聚合物。发现在DPP基共聚物中引入更长的β-未取代的低聚噻吩单元对DPP-低聚噻吩共聚物的分子量和溶解度有很大影响,最终影响有机薄膜晶体管(OTFT)的性能,这表明对于这种显示最佳OTFT性能的共聚物,在β-未取代的低聚噻吩中存在合适数目的噻吩基团。这项工作还通过调节分子间链的π–π堆积与分子量以及刚性主链的溶