异构体结构对纳夫托迪烯半导体聚合物的晶体管性能的影响
Itaru Osaka1, Toru Abe, Shoji Shinamura
1Department of Chemistry, Graduate School of Engineering, Hiroshima University, 1-4-1 Kagamiyama, Higashi-Hiroshima, Hiroshima 739-8527, Japan. iosaka@hiroshima-u.ac.jp
Journal of the American Chemical Society
|April 12, 2011
概括
聚烯骨架中的角性纳夫托迪烯 (NDT) 显著提高有机半导体中的电荷载体移动性. 具有角形NDT3的聚合物由于增强的分子排序和电子移位而表现出卓越的性能.
科学领域:
- 有机电子学有机电子学
- 材料科学是一种材料科学.
- 聚合物化学 聚合物化学
背景情况:
- 聚乙烯半导体对于有机电子非常重要.
- 纳夫托迪烯 (NDT) 被探索为改善半导体性能的构建模块.
- 了解结构属性关系是设计高性能材料的关键.
研究的目的:
- 为了研究线性和角性纳夫托迪烯 (NDT) 同体对聚烯半导体性能的影响.
- 在基于NDT的聚合物中,将分子结构与电荷载体流动性相关联.
- 为高性能有机场效应晶体管确定有前途的NDT结构.
主要方法:
- 合成四个基于NDT的异构聚烯半导体.
- 场效应晶体管性能的表征,包括电荷载体的移动性.
- 进行X射线衍射分析以确定聚合物结构排序和π堆叠.
- 分子轨道 (MO) 计算和电离电位测量以分析电子结构.
主要成果:
- 具有角 NDT3 的聚合物表现出最高的流动性 (∼0.8 cm2 V-1 s-1),是半导体聚合物中报告最好的.
- 与预期相反,角形的NDT聚合物显示出比线性NDT聚合物更高的移动性.
- 在角形NDT聚合物中,X射线衍射揭示了高度有序的结构,与线性NDT聚合物不同,在角形NDT聚合物中具有密切的π堆叠 (3.6 Å).
- MO计算表明,在角NDT聚合物中,在脊柱沿线移位的HOMO,促进了高效的电荷传输.
结论:
- 角型NDT,特别是NDT3,是高性能半导体聚合物的有希望的核心.
- 分子形状和电子结构是设计高效的高分子电荷载体传输的关键因素.
- 角形NDT提供的伪直线骨干可促进高度有序的包装和改进的移动性.
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