Correlating the structures and photovoltaic properties in phase-separated blends of conjugated donor polymers and acceptors
Correlating the structures and photovoltaic properties in phase-separated blends of conjugated donor polymers and acceptors
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DOI：
10.1038/s41428-022-00718-9
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发表时间：
2022-10
期刊：
影响因子：
2.8
通讯作者：
Jihun Jeon;Kiyotaka Doi;H. Kim;H. Ogawa;M. Takenaka;Hideo Ohkita
中科院分区：
文献类型：
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作者：
Jihun Jeon;Kiyotaka Doi;H. Kim;H. Ogawa;M. Takenaka;Hideo Ohkita
聚合物太阳能电池的能量转换效率很大程度上取决于聚合物给体和受体材料之间互穿网络结构的微观形貌。因此，有必要了解光伏性能和共混活性层中的相分离结构之间的关系。在这里，我们讨论了电荷产生和收集和相分离的结构之间的关系，这是分析了基于噻吩的共轭聚合物供体和以下不同的受体的共混物的聚合物太阳能电池的三元相图：富勒烯衍生物，非富勒烯受体，和共轭聚合物受体。通过考虑基于Flory-Huggins相互作用参数的三元相图，讨论了每种材料组合中混合相中的双结点点和受主体积分数。此外，我们提出了根据受体材料的分子量来提高聚合物太阳能电池效率的策略。这些发现将为开发高效聚合物太阳能电池提供指导。
The power conversion efficiency of polymer solar cells strongly depends on the microscale morphology of the interpenetrating network structures between the polymer donor and acceptor materials. Therefore, it is essential to understand the relationship between photovoltaic properties and phase-separated structures in the blend active layer. Here, we discuss the relationship between charge generation and collection and phase-separated structures, which was analyzed by a ternary phase diagram for polymer solar cells based on blends of a thiophene-based conjugated polymer donors and the following different acceptors: a fullerene derivative, a nonfullerene acceptor, and a conjugated polymer acceptor. By considering the ternary phase diagram based on the Flory–Huggins interaction parameters, we discuss the binodal point and acceptor volume fraction in the mixed phase in each material combination. Furthermore, we suggest strategies for improving the efficiency of polymer solar cells according to the molecular weight of acceptor materials. These findings will provide a guideline for developing highly efficient polymer solar cells.