Modulating Molecular Orientation Enables Efficient Nonfullerene Small-Molecule Organic Solar Cells
Modulating Molecular Orientation Enables Efficient Nonfullerene Small-Molecule Organic Solar Cells
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调节分子取向可实现高效的非富勒烯小分子有机太阳能电池
DOI：
10.1021/acs.chemmater.8b00287
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发表时间：
2018
影响因子：
8.6
通讯作者：
Hou Jianhui
中科院分区：
文献类型：
--
作者：
Yang Liyan;Zhang Shaoqing;He Chang;Zhang Jianqi;Yang Yang;Zhu Jie;Cui Yong;Zhao Wenchao;Zhang Hao;Zhang Yun;Wei Zhixiang;Hou Jianhui
在体异质结有机太阳能电池中，激子解离和电荷输运对共混膜中的分子堆积模式和相分离形态高度敏感。高效的光伏小分子（SM）通常具有导致固有各向异性的受体-供体-受体结构，由于缺乏用于调节分子取向的有效方法而限制了对分子堆积的控制。在这份报告中，我们设计了一组模型化合物，命名为DRTB-T-CX（X = 2，4，6，和8），以证明调节末端烷基链的长度可以用来修改分子取向。基于DRTB-T-C4/IT-4F的器件实现了高达11.24%的最高性能功率转换效率（PCE），这是最先进的非富勒烯SM有机太阳能电池（NFSM-OSC）的最佳性能。
In bulk-heterojunction organic solar cells (BHJ-OSCs), exciton dissociation and charge transport are highly sensitive to the molecular packing pattern and phase separation morphology in blend films. Efficient photovoltaic small molecules (SMs) typically possess an acceptor–donor–acceptor structure that causes intrinsic anisotropy, limiting the control over molecular packing because of the lack of an effective method for modulating molecular orientation. In this report, we design a group of model compounds, named DRTB-T-CX (X = 2, 4, 6, and 8), to demonstrate that adjusting the length of the end alkyl chain can be used to modify the molecular orientation. A top-performance power conversion efficiency (PCE) of up to 11.24% is achieved with a DRTB-T-C4/IT-4F-based device, which is the best performance reported for a state-of-the-art nonfullerene SM organic solar cell (NFSM-OSC).