在有机-有机半导体接口上的光电子和电荷传输特性:基于多化的聚合物混合物和共聚物之间的比较
Ji-Seon Kim1, Linus Lu, Paiboon Sreearunothai
1Cavendish Laboratory, University of Cambridge, J. J. Thomson Avenue, Cambridge CB3 0HE, UK. jkim1@imperial.ac.uk
Journal of the American Chemical Society
|September 5, 2008
概括
我们研究了合聚合物的有机半导体接口,发现联聚合物可以改善电荷传输和设备稳定性. 这项研究有助于设计更好的分子电子.
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:
- 有机-有机半导体接口对于设备性能至关重要.
- 结合聚合物,如多9,9-di-n-octylfluorene-alt-N-(4-butylphenyl) diphenylamine) (TFB) 和多9,9-di-n-octylfluorene-alt-benzothiadiazole) (F8BT) 是关键材料. 这两种聚合物在聚合物中具有非常重要的作用.
研究的目的:
- 研究链间和链内接口的光电子和电荷传输特性.
- 为了比较混合与共聚合TFB和F8BT的性能.
- 为分子电子学中改进的合聚合物制定设计规则.
主要方法:
- 使用TFB (电子捐赠体) 和F8BT (电子接受体) 聚合物制造有机-有机半导体接口.
- 混合和共聚合技术,以创建不同的接口类型.
- 对光电子特性 (吸收,排放) 和电荷传输的详细研究.
主要成果:
- 将TFB纳入F8BT的骨干蓝移吸收,但可以实现高效的链内激电子形成与红移排放.
- 在共聚合物与混合物 (数十个ps) 中,极快的能量转移 (<1ps).
- 聚合物表现出较低的光效率,这是由于刺激子迁移到非发射状态.
- 聚合物中的分子级接口增强了电荷载体平衡和在高电压下设备的稳定性.
结论:
- 将TFB和F8BT (共聚物) 共同连接,可以产生高效的链内能量传输和改善电荷载体平衡.
- 与混合物相比,共聚合物接口导致更稳定的有机发光二极管.
- 了解这些接口特性对于设计下一代分子电子的合聚合物至关重要.
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