Synthesis and Characterization of Angular-Shaped Naphtho[1,2-<i>b</i>;5,6-<i>b</i>′]difuran–Diketopyrrolopyrrole-Containing Copolymers for High-Performance Organic Field-Effect Transistors
作者:Shaowei Shi、Xiaodong Xie、Chen Gao、Keli Shi、Song Chen、Gui Yu、Longhai Guo、Xiaoyu Li、Haiqiao Wang
DOI:10.1021/ma402107n
日期:2014.1.28
We reported the synthesis, characterization, and field-effect transistor properties of two diketopyrrolopyrrole (DPP)-based π-conjugated copolymers PNDF3-T-DPP and PNDF3-BT-DPP by introducing naphtho[1,2-b;5,6-b′]difuran (NDF3) or NDF3 bridged with alkylthienyl as the donor unit. Compared with PNDF3-T-DPP, the incorporation of a short π-conjugated thiophene spacer into PNDF3-BT-DPP resulted in a “wave”
我们通过引入萘[1,2- b ; 5,6- b ']二呋喃(NDF3)或以烷基噻吩基作为供体单元桥接的NDF3。与PNDF3-T-DPP相比,在PNDF3-BT-DPP中掺入短的π-共轭噻吩间隔基会形成“波状”分子主链,从而导致较差的有序结构和较低的电荷载流子迁移率。薄膜,尽管改善了溶解度和可加工性。另一方面,通过用硫类似物取代NDF3,萘[1,2- b ; 5,6- b']二噻吩(NDT3),所得的基于NDT3的聚合物具有较差的溶解度和扭曲的空间结构,从而导致较低的空穴迁移率。相反,当在有机场效应晶体管(OFET)器件中用作有源层时,PNDF3-T-DPP和PNDF3-BT-DPP表现出出色的空穴迁移率。即使不进行热退火,PNDF3-T-DPP和PNDF3-BT-DPP的最高空穴迁移率也分别达到0.24和0.11 cm 2 V –1 s –1。更高的空穴迁移率,最高可达0.56和0.35