堆积
侧链
共轭体系
活动层
有机太阳能电池
材料科学
戒指(化学)
小分子
分子工程
聚合物太阳能电池
相(物质)
图层(电子)
芳香性
富勒烯
纳米技术
能量转换效率
接受者
有机半导体
化学
光电子学
分子
聚合物
有机化学
生物化学
薄膜晶体管
复合材料
作者
Chaohao Hu,Jingjing Xu,Songming Cai,Peihao Huang,Jiyeon Oh,Changduk Yang,Shanshan Chen,Kuan Sun,Ke Yang,Shirong Lu
出处
期刊:Solar RRL
[Wiley]
日期:2021-10-19
卷期号:5 (12)
被引量:6
标识
DOI:10.1002/solr.202100705
摘要
Side‐chain engineering influences the organic solar cell (OSC) devices active layer morphology fundamentally and it is an efficient strategy to improve device performances. A novel small molecular donor with conjugated fused‐aromatic‐ring side chain on a benzo[1,2‐ b :4,5‐ b′ ]dithiophene core is developed. To the best of our knowledge, this is the first example where fused‐aromatic‐ring units are being utilized as conjugated side chains to extend the conjugation system of small molecular donor materials. The material property, OSC device performance, active layer morphology, and photovoltaic mechanism are investigated. This molecular design strategy has proven to be effective in fine‐tuning and enhancing the molecular stacking/orientation and phase separation, which led to the enhanced charge separation and transportation, suppressed charge recombination, and as a result, devices with an improved short‐circuit current density of 24.9 mA cm −2 , fill factor of 69.9%, and power conversion efficiency of 13.6% are achieved. The results reveal that a fused‐aromatic‐ring utilized as conjugated side chain strategy can potentially be an effective way for molecular rational design, aiming to improve the OSC performances.
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