Zhu Xiangwei, Lu Kun, Xia Benzheng, Fang Jin, Zhao Yifan, Zhao Tianyi, Wei Zhixiang, Jiang Lei
National Center for Nanoscience and Technology, Beijing 100190, China.
Key Laboratory of Bio-Inspired Smart Interfacial Science and Technology of Ministry of Education, School of Chemistry and Environment, Beihang University, Beijing 100191, China.
Polymers (Basel). 2015 Dec 29;8(1):4. doi: 10.3390/polym8010004.
A novel random copolymer based on donor⁻acceptor type polymers containing benzodithiophene and dithienosilole as donors and benzothiazole and diketopyrrolopyrrole as acceptors was designed and synthesized by Stille copolymerization, and their optical, electrochemical, charge transport, and photovoltaic properties were investigated. This copolymer with high molecular weight exhibited broad and strong absorption covering the spectra range from 500 to 800 nm with absorption maxima at around 750 nm, which would be very conducive to obtaining large short-circuits current densities. Unlike the general approach using single solvent to prepare the active layer film, mixed solvents were introduced to change the film feature and improve the morphology of the active layer, which lead to a significant improvement of the power conversion efficiency. These results indicate that constructing random copolymer with multiple donor and acceptor monomers and choosing proper mixed solvents to change the characteristics of the film is a very promising way for manufacturing organic solar cells with large current density and high power conversion efficiency.
设计并通过Stille共聚反应合成了一种新型的基于供体-受体型聚合物的无规共聚物，该聚合物以苯并二噻吩和二噻吩并硅杂环戊二烯作为供体，苯并噻唑和二酮吡咯并吡咯作为受体，并对其光学、电化学、电荷传输和光伏性能进行了研究。这种高分子量的共聚物表现出宽泛且强烈的吸收，覆盖了500至800 nm的光谱范围，吸收最大值在750 nm左右，这将非常有利于获得大的短路电流密度。与使用单一溶剂制备活性层薄膜的常规方法不同，引入混合溶剂以改变薄膜特性并改善活性层的形态，这导致功率转换效率有显著提高。这些结果表明，构建具有多个供体和受体单体的无规共聚物并选择合适的混合溶剂来改变薄膜特性，是制造具有大电流密度和高功率转换效率的有机太阳能电池的一种非常有前景的方法。
