Tuning Frontier Orbital Energetics of Azaisoindigo-Based Polymeric Semiconductors to Enhance the Charge-Transport Properties
Tuning Frontier Orbital Energetics of Azaisoindigo-Based Polymeric Semiconductors to Enhance the Charge-Transport Properties
复制标题
调整偶氮靛基聚合物半导体的前沿轨道能量以增强电荷传输性能
DOI：
10.1002/aelm.201700078
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发表时间：
2017-11-01
影响因子：
6.2
通讯作者：
Yu, Gui
中科院分区：
文献类型：
--
作者：
Huang, Jianyao;Chen, Zhihui;Yu, Gui
建立聚合物主链结构与场效应晶体管性能之间的构效关系是有机电子学研究的一个新课题。有机半导体的可调谐性和多样性为控制其电学性质提供了可能性。本文介绍了含噻吩并噻吩、二硫代苯乙烯、双硒代苯乙烯和二硒代苯乙烯的氮杂异靛共聚物的表征。理论计算和实验结果表明，主链电子结构和线性度、侧链密度、聚集态和薄膜微结构等因素与聚合物的光电性能有关。随着共轭长度的增加，聚合物半导体的n型行为受到抑制，导致从几乎平衡的双极行为到占主导地位的p型特性的变化。杂原子取代的效果也进行了研究。值得注意的是，从近似理想的I-V曲线中提取的1.14和1.54 cm（2）V-1 s（-1）的高空穴和电子迁移率通过顶栅/底接触配置晶体管实现，证明了基于7，7-二氮杂异靛蓝的半导体聚合物在有机电子学中的应用潜力。
To establish a structure-property relationship between polymer backbone structures and field-effect transistor performance has emerged as a new topic in organic electronics. The tunability and diversity of organic semiconductors provide the feasibility of controlling the electrical properties. Herein the characterization of thienothiophene-, dithiophenylethene-, biselenophene-, and diselenophenylethene-containing azaisoindigo copolymers is presented. As suggested by both theoretical calculations and experimental results, backbone electronic structure and linearity, density of side chains, aggregation, and thin film microstructure are involved in the differences in optical and electrical properties of these polymers. As the conjugation lengthens, n-type behaviors of the polymer semiconductors are suppressed, leading to a variation from nearly balanced ambipolar behaviors to predominant p-type characteristics. The effect of heteroatom substitution is also investigated. Notably, high hole and electron mobilities of 1.14 and 1.54 cm(2) V-1 s(-1) extracted from approximately ideal I-V curves are achieved with the top-gate/bottom-contact configuration transistors, demonstrating the potential of 7,7-diazaisoindigo-based semiconducting polymers for applications in organic electronics.