在溶液剪切的有机半导体中使用格子应变传输调电荷
Gaurav Giri1, Eric Verploegen, Stefan C B Mannsfeld
1Department of Chemical Engineering, Stanford University, Stanford, California 94305, USA.
Nature
|December 24, 2011
概括
研究人员开发了一种溶液处理技术,通过引入格子应变来提高有机半导体性能. 这种方法提高了电荷载体的移动性,这对于灵活和低成本的电子设备至关重要.
科学领域:
- 材料科学 材料科学 材料科学
- 有机电子 有机电子
- 固态物理 固态物理
背景情况:
- 有机半导体是灵活,透明和低成本电子产品的关键.
- 提高溶液加工有机半导体中的电荷载体移动性对于设备性能至关重要.
- 无机半导体中的格子应变增强了电荷载体的移动性.
研究的目的:
- 开发一种用于有机半导体的溶液处理技术,利用格子应变来增加电荷载体的移动性.
- 研究格子应变对有机半导体中的分子包装和电子轨道重叠的影响.
- 为了在有机半导体设备中实现更高的电荷载体移动性.
主要方法:
- 采用了一种新的溶液加工技术,在有机半导体中引入受控的晶格应变.
- 6,13-bis(triisopropylsilylethynyl) pentacene (TIPS-pentacene) 的 π-π 堆叠距离通过施加应变系统地减少.
- 有机场效应晶体管 (OFETs) 使用应力和未应力TIPS-pentacene薄膜来制造,以测量电荷载体的移动性.
主要成果:
- 在TIPS-pentacene中,π-π堆叠距离从3.33 Å减少到3.08 Å,这是有机半导体晶格中报告的最短距离.
- 由于缩小 π-π 堆叠距离,联脊柱之间的电子轨道重叠显著增加.
- 在TIPS-pentacene晶体管中,正电荷载体 (孔) 的移动性从0.8cm2V-1s-1 (不应力) 增加到4.6cm2V-1s-1 (应力).
结论:
- 溶液处理与格子应变相结合,是提高有机半导体中电荷载体移动性的有效策略.
- 这种技术为开发高性能,低成本的有机电子设备提供了途径.
- 通过格子应变控制分子包装对于优化有机半导体性能至关重要.
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