在纳米尺度上可视化的光伏充电生成:一个原则证明
Andrea Liscio1, Giovanna De Luca, Fabian Nolde
1ISOF-CNR, via Gobetti 101, 40129 Bologna, Italy.
Journal of the American Chemical Society
|December 25, 2007
概括
研究人员在有机太阳能电池中展示了纳米级光伏活动. 他们发现,电子受体-捐赠体混合物只有在直接接触时才能显示电荷转移,这对于塑料光伏来说至关重要.
科学领域:
- 材料科学 材料科学 材料科学
- 有机电子 有机电子
- 太阳能光伏发电是如何实现的
背景情况:
- 有机太阳能电池依赖于相分离的电子接受器-捐赠器混合物.
- 了解纳米级相互作用至关重要,因为它与刺激子扩散长度有关.
- 以前的研究缺乏纳米分辨率来可视化这些混合物中的光伏活动.
研究的目的:
- 在相分离电子接受器-捐赠器混合架构中展示纳米级光伏活动.
- 调查在电荷转移过程中供体和接受体之间的身体接触的作用.
- 为塑料光伏提供一种适用于各种双组件材料的方法.
主要方法:
- 使用凯尔文探针力显微镜 (KPFM) 进行纳米级表面电位测量.
- 采用一个模拟系统,以区域常规的多3-基thiophene (P3HT) 作为电子捐赠体和N,N'-bis1-乙烯) -3,4:9,10-烯 bis (PDI) 作为电子接受体.
- 分析了与P3HT接触的PDI星团与孤立的PDI星团在白光照明下的表面电位变化.
主要成果:
- 观察到PDI星团在照明时的明显表面电位变化,这取决于它们与P3HT的接触.
- 证明只有与P3HT物理接触的PDI集群表现出显著的电荷转移.
- 确认孤立的PDI集群,尽管吸收光和产生激子,但没有显示明显的电荷转移.
结论:
- 在有机太阳能电池混合物中建立了光伏活动的纳米尺度原理证明.
- 毫不含糊地证明了电子供体 (P3HT) 和受体 (PDI) 阶段之间的直接物理接触对于电荷转移至关重要.
- KPFM技术提供了一种新且广泛适用的方法,用于分析双组件有机电子材料中的电荷传递机制.
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