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高性能全聚合物太阳能电池通过微调晶体和溶剂火的协同效应

Zhaojun Li¹, Xiaofeng Xu¹, Wei Zhang²

¹Department of Chemistry and Chemical Engineering, Chalmers University of Technology , SE-412 96 Göteborg, Sweden.

Journal of the American Chemical Society

|August 2, 2016

概括

研究人员开发了高效全聚合物太阳能电池 (全PSC) 的新聚合物受体. 修改聚合物结构改善了混合物形态和电荷传输,实现所有PSC的记录填充系数 (FF) 为0.71.

科学领域:

材料科学
有机电子
太阳能发电

背景情况:

聚合物受体正在成为高性能全聚合物太阳能电池 (全PSC) 中富勒衍生物的替代品.
低填充因子 (FF),通常低于0.65,是所有PSC效率的显著限制,与聚合物:聚合物混合物的电荷移动性和薄膜形态有关.

研究的目的:

开发一种简单的方法来调节基于二甲 (NDI) 的聚合物受体的结晶性.
通过优化聚合物混合物形态和电荷传输特性来提高全聚合物太阳能电池 (全PSC) 的性能.

主要方法:

合成了一系列随机聚合物 (PNDI-Tx) 通过在N2200骨干中用单一的 thiophene (T) 单位取代.
研究了PNDI-T10与供体聚合物PTB7-Th的混合性和纳米结构.
采用溶剂回火 (SA) 来改善薄膜形态,电荷移动性和减少重组.

主要成果:

PNDI-T10接受器与PTB7-Th具有良好的混合性,导致纳米结构混合物,促进激素解离和电荷传输.
溶剂回火显著增加了孔和电子的移动性,并抑制了双分子重组.
PTB7-Th:PNDI-T10太阳能电池的功率转换效率 (PCE) 为7.6%,填充系数 (FF) 为0.71,比PTB7-Th:N2200电池显著提高.

结论:

具有微调结晶性的聚合物受体的合理设计对于高性能全PSC至关重要.
半晶聚合物的优化结构和形态工程:聚合物混合物显示了推进全PSC技术的巨大潜力.
达到0.71的记录填充率 (FF) 凸显了该战略的有效性.

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