材料科学
三元运算
聚合物太阳能电池
有机太阳能电池
聚合物
混溶性
激子
化学工程
能量转换效率
发光
活动层
聚合物混合物
纳米技术
光电子学
共聚物
复合材料
图层(电子)
工程类
程序设计语言
物理
薄膜晶体管
量子力学
计算机科学
作者
Xiaoyang Du,Hui Lin,Xinwei Chen,Silu Tao,Caijun Zheng,Shun Zhang
出处
期刊:Nanoscale
[The Royal Society of Chemistry]
日期:2018-01-01
卷期号:10 (35): 16455-16467
被引量:15
摘要
Incorporation of a ternary organic component is an effective strategy to enhance the performance of bulk heterojunction (BHJ) organic solar cells (OSCs). In this study, a small molecule luminescent dye, C545T, was first doped into blends of PTB7-Th/PC71BM and PTB7/PC71BM as a third component to fabricate ternary OSCs. It is demonstrated that C545T can disrupt the severe vertical distribution in the binary blend and effectively modulate the novel surface chemical configuration by improving the self-assembly process of the polymer donor, as a result of the good miscibility among the active layer materials and the π-π interactions between PC71BM and C545T. The obtained homogeneously bicontinuous BHJ with numerous interpenetrating nanofibers optimizes the domain size of exciton diffusion and the length of charge transfer. The energy transfer between C545T and polymers changes the transmission path of photo-generated excitons, which together improve the exciton dissociation process and reduce the recombination loss. Champion power conversion efficiencies (PCEs) of 10.69% and 9.42% were achieved by the ternary blends of PTB7-Th/C545T/PC71BM and PTB7/C545T/PC71BM, respectively, which correspond to a nearly 20% enhancement over their binary counterparts.
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