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结合的聚合物-小分子合金导致高效的三级有机太阳能电池

Jianqi Zhang¹, Yajie Zhang¹, Jin Fang¹

¹†Key Laboratory of Nanosystem and Hierarchical Fabrication, National Center for Nanoscience and Technology, Beijing 100190, P. R. China.

Journal of the American Chemical Society

|June 9, 2015

概括

三级有机太阳能电池通过形成两个捐赠体的合金,实现了10.5%的功率转换效率 (PCE). 这一策略增强了电荷传输,减少了重组,为更高效的有机太阳能电池 (OSC) 铺平了道路.

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:

三级有机太阳能电池 (OSC) 提供了提高散装异质连接性能的潜力.
三元系统中的相隔复杂性挑战了功率转换效率 (PCE) 的提升.

研究的目的:

用两个捐赠者和一个接受者制造和研究一个三元的OSC.
探索两个捐赠者之间的"合金"形成及其对设备性能的影响.
通过三元混合战略增强有机太阳能电池的PCE.

主要方法:

一个三元有机太阳能电池 (OSC) 的制造,包括PTB7-Th (聚合物供体),p-DTS(FBTTH2) 2 (小分子供体) 和PC71BM (受体).
对三元混合物的分析,建议在两个捐赠体之间形成合金.
设备性能的表征,包括PCE,填充系数 (FF),短路电流密度 (Jsc) 和开路电压 (Voc).

主要成果:

在三元OSC中平均获得10.5%的PCE.
观察到FF和Jsc的改进,Voc没有固定到二元混合物的较低值.
合金结构的形成导致了聚合物分子高度有序的面对面方向.

结论:

由两个可混合的捐赠体形成的合金结构促进了增强的电荷分离,运输和减少重组.
通过这种合金形成策略,可以实现高晶度和面对聚合物导向.
使用可混合捐赠者的三元混合策略提供了一条可行的途径,以显著提高OSC PCE.

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