大面积的液晶单域场效应晶体管
Albert J J M van Breemen1, Peter T Herwig, Ceciel H T Chlon
1TNO Science and Industry, De Rondom 1, P. O. Box 6235, 5600 HE Eindhoven, The Netherlands. albert.vanbreemen@tno.nl
Journal of the American Chemical Society
|February 16, 2006
概括
研究人员合成了液晶有机半导体,并将其加工成自组装膜. 单域形成显著增强了电场效应晶体管中的电荷载体流动性,实现了十倍的增长.
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.
- 半导体物理 半导体物理
背景情况:
- 液晶有机半导体为电子应用提供可调节的特性.
- 控制薄膜中的分子排序对于优化电荷传输至关重要.
- 自组装和回火技术是开发有序半导体结构的关键.
研究的目的:
- 合成和描述具有不同链长度的新型液晶有机半导体.
- 研究自组装单域膜的结构,光学和电气特性.
- 评估这些材料在有机场效应晶体管 (OFET) 中的性能.
主要方法:
- 合成5,5''-bis(5-基-2-乙烯乙烯) -2,2':5',2''-三烯的丁,六和二衍生物.
- 优化了热,用于创建自组装的单域膜.
- 用X射线衍光度,紫外线/紫外线吸收光谱和原子力显微镜 (AFM) 进行结构和光学分析.
- 飞行时间 (TOF) 测量和制造顶端门电场效应晶体管用于电气表征.
主要成果:
- 六和十衍生物形成了大面积 (高达150毫米) 的自组装单域膜.
- X射线衍射证实了单晶单临床形态,分子倾斜在50度左右.
- 紫外线/紫外线光谱显示H聚合具有高二合比 (19),而AFM显示自我亲和.
- 观察到双极电荷传输,孔移动率高达0.02cm2/Vs,电子移动率约为0.002cm2/Vs.
- 单域OFET表现出高达0.02cm2/Vs的异型孔流动性,比多域设备改进10倍.
结论:
- 优化的回火使得高排序的单晶有机半导体薄膜能够形成.
- 单域膜中的分子包装和定位显著提高了电荷载体的移动性.
- 这些液晶材料对高性能,大面积的有机电子设备充满希望.
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