有机太阳能电池
材料科学
结晶度
小分子
有机分子
分子
纳米技术
化学工程
聚合物
复合材料
有机化学
化学
生物化学
工程类
作者
Huan Li,Yifan Zhao,Jin Fang,Xiangwei Zhu,Benzheng Xia,Kun Lü,Weimin Zhen,Jianqi Zhang,Xuefeng Guo,Zhixiang Wei
标识
DOI:10.1002/aenm.201702377
摘要
Abstract Significant development has been achieved in nonfullerene organic solar cells. However, most of the high‐efficiency nonfullerene systems are composed of polymer donors and fused‐ring acceptors, and only a few small molecule donors can work well. Herein, a new A–D–A small molecule donor named NDTSR with naphtho[1,2‐b:5,6‐b′]dithiophene (NDT) as building blocks is synthesized. Two energy levels well‐matched fused‐ring acceptors ITIC and IDIC are chosen to construct all‐small‐molecule solar cells with NDTSR, respectively. When mixed with IDIC, a high power conversion efficiency (PCE) of 8.05% is achieved, which is the highest efficiency for NDT‐based small molecule donor. However, the NDTSR:ITIC system only exhibits a low PCE of 1.77%. The big difference in the performance of these two systems should be attributed to the different morphology and phase separation resulting from the crystallinity and aggregation ability of the acceptors. The results demonstrate that NDT‐based small molecule is a promising candidate donor for all‐small‐molecule systems, while the crystallinity of fused‐ring acceptors is a critical factor for optimizing the phase separation in the active layer.
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