在有机薄膜晶体管的小分子聚合物混合半导体中,区域精炼效应
Yeon Sook Chung1, Nayool Shin, Jihoon Kang
1Department of Chemistry, Seoul National University, Seoul 151-747, Korea.
Journal of the American Chemical Society
|December 16, 2010
概括
有机半导体和聚合物的混合膜通过有效地去除阻碍性能的杂质来提高设备性能. 这种"区域精制效应"对于高性能有机薄膜晶体管 (OTFT) 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
- 聚合物科学 聚合物科学
背景情况:
- 与绝缘聚合物混合的小分子半导体在有机薄膜晶体管 (OTFT) 中提供了增强的解决方案可加工性和性能.
- 小分子半导体中的杂质,如紫外线暴露的三乙乙乙烯四二甲 (TESADT),大大降低了场效应的移动性,并破坏了晶体相.
研究的目的:
- 阐明混合膜在OTFT中性能提高背后的机制.
- 研究杂质的作用及其在混合半导体系统中的去除.
主要方法:
- 使用纯净和聚合物混合的TESADT制造和表征OTFT,包括不纯净和暴露于UV的样本.
- 分析相位过渡特性和现场效应移动性的分析.
- 中子反射性研究,以了解薄膜形态和相位分离.
主要成果:
- 清洁不纯的TESADT表现出明显减少的移动性 (<10(-5) cm(2) / V s)) 并失去其高温晶体相.
- 紫外线暴露的TESADT与聚甲基烯 (PαMS) 的混合膜显示出恢复的移动性 (0.040 cm) 和部分恢复相变特征.
- 在老化的TIPS-pentacene混合膜中观察到类似的效应,支持该现象的一般适用性.
结论:
- 混合膜中的垂直相位分离产生了富含聚合物的层,将有害的杂质物种隔离起来.
- 这种"区域精炼效应"有效地从电荷传输接口中清除杂质,提高OTFT的性能.
- 混合半导体提供了一种可行的策略,以克服有机电子设备中杂质造成的性能限制.
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