Achieving High Performance Stretchable Conjugated Polymers via Donor Structure Engineering
Achieving High Performance Stretchable Conjugated Polymers via Donor Structure Engineering
复制标题
通过供体结构工程实现高性能可拉伸共轭聚合物
DOI：
10.1002/marc.202300169
复制
发表时间：
2023
影响因子：
4.6
通讯作者：
Qiu, Longzhen
中科院分区：
文献类型：
--
作者：
Wu, Ning;Huang, Gang;Huang, Hua;Wang, Yunfei;Gu, Xiaodan;Wang, Xiaohong;Qiu, Longzhen
开发了一种骨干工程策略来调整共轭聚合物半导体的机械和电气性能。使用硒吩 (Se)、噻吩并噻吩 (TT)、联噻吩 (BT) 和噻吩亚乙烯基噻吩 (TVT) 作为供体，硅氧烷侧链改性的二酮吡咯并吡咯 (DPP) 作为受体合成了四种供体 - 受体 (D–A) 聚合物，命名为 PTDPPSe、PTDPPTT、PTDPPBT 和 PTDPPTVT。研究了供体结构对聚合物能级、薄膜形态、分子堆积、载流子传输性能和拉伸性能的影响。 PTDPPSe 薄膜表现出最好的拉伸性，裂纹起始应变大于 100%，但电性能最差，迁移率仅为 0.54 cm2V−1s−1。用更大的共轭供体（即 TT、BT 和 TVT）替代 Se 供体，可显着提高共轭聚合物的迁移率，但也会导致拉伸性降低。值得注意的是，PTDPPBT 具有适度的拉伸性，裂纹起始应变约为 50%，并且具有优异的电性能。在 50% 应变下，其平行于拉伸方向的迁移率为 2.37 cm2V−1s−1，高于大多数可拉伸共轭聚合物在此拉伸状态下的迁移率。
A backbone engineering strategy is developed to tune the mechanical and electrical properties of conjugated polymer semiconductors. Four Donor–Acceptor (D–A) polymers, named PTDPPSe, PTDPPTT, PTDPPBT, and PTDPPTVT, are synthesized using selenophene (Se), thienothiophene (TT), bithiophene (BT), and thienylenevinylenethiophene (TVT) as the donors and siloxane side chain modified diketopyrrolopyrrole (DPP) as acceptor. The influences of the donor structure on the polymer energy level, film morphology, molecular stacking, carrier transport properties, and tensile properties are all examined. The films of PTDPPSe show the best stretchability with crack‐onset‐strain greater than 100%, but the worst electrical properties with a mobility of only 0.54 cm2V−1s−1. The replacement of the Se donor with larger conjugated donors, that is, TT, BT, and TVT, significantly improves the mobility of conjugated polymers but also leads to reduced stretchability. Remarkably, PTDPPBT exhibits moderate stretchability with crack‐onset‐strain ≈50% and excellent electrical properties. At 50% strain, it has a mobility of 2.37 cm2V−1s−1parallel to the stretched direction, which is higher than the mobility of most stretchable conjugated polymers in this stretching state.