Remarkable effect of pi-skeleton conformation in finitely conjugated polymer semiconductors
Remarkable effect of pi-skeleton conformation in finitely conjugated polymer semiconductors
复制标题
π骨架构象在有限共轭聚合物半导体中的显着效应
DOI：
10.1039/d0tc01303j
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发表时间：
2020
影响因子：
6.4
通讯作者：
Yu Gui
中科院分区：
文献类型：
--
作者：
Chen Zhihui;Zhang Weifeng;Zhou Yankai;Wei Xuyang;Li Chenyu;Wang Liping;Yu Gui
共轭聚合物半导体的结构-性能关系至今尚未得到充分的研究。本文报道了三种新型的含噻吩（T）、2，2 ′-联噻吩（BiT）和2，2 ′：5′，2 ′′-三噻吩（TriT）的双乙烯共轭聚合物PNBDO-T、PNBDO-BiT和PNBDO-TriT。所有三种聚合物在环境条件下显示双极电荷传输特性。具有中心对称BiT单元的PNBDO-BiT表现出4.15 cm 2 V−1 s−1的最大电子迁移率，远高于具有轴对称T或TriT单元的PNBDO-T和PNBDO-TriT的迁移率1.01 × 10−2和0.052 cm 2 V−1 s−1。同时，PNBDO-BiT形成了比其他两种聚合物更有序和结晶的分子聚集体。我们将这些差异归因于这些聚合物中的中心对称或轴对称给电子单元引起的π-骨架构象。结果表明，线性π-骨架的构建对高性能共轭聚合物半导体的发展具有重要意义。
The structure–property relationship of finitely conjugated polymer semiconductors is underdeveloped to date. Herein, we report three novel tetrafluoroethylene-containing finitely conjugated polymers, PNBDO-T, PNBDO-BiT and PNBDO-TriT, containing electron-donating units of thiophene (T), 2,2′-bithiophene (BiT), or 2,2′:5′,2′′-terthiophene (TriT), respectively. All three polymers showed ambipolar charge transport characteristics under ambient conditions. PNBDO-BiT with a centrosymmetric BiT unit exhibited a maximum electron mobility of 4.15 cm2 V−1 s−1, much higher than the mobilities of 1.01 × 10−2 and 0.052 cm2 V−1 s−1 of PNBDO-T and PNBDO-TriT, respectively, with axisymmetric T or TriT units. Meanwhile, PNBDO-BiT formed more ordered and crystalline molecular aggregation than the other two polymers. We attributed the differences to their π-skeleton conformations induced by the centrosymmetric or axisymmetric electron-donating units in these polymers. The results show that the construction of linear π-skeletons is of great importance in the development of high-performance finitely conjugated polymer semiconductors.