Ring-Fusion of Perylene Diimide Acceptor Enabling Efficient Nonfullerene Organic Solar Cells with a Small Voltage Loss

被引:310
作者
Zhang, Jianquan [1 ,2 ]
Li, Yunke [1 ,2 ]
Huang, Jiachen [1 ,2 ]
Hu, Huawei [1 ,2 ]
Zhang, Guangye [1 ,2 ]
Ma, Tingxuan [1 ,2 ]
Chow, Philip C. Y. [1 ,2 ]
Ade, Harald [4 ]
Pan, Ding [1 ,2 ,3 ]
Yan, He [1 ,2 ]
机构
[1] Hong Kong Univ Sci & Technol, Dept Chem, Kowloon, Hong Kong, Peoples R China
[2] Hong Kong Univ Sci & Technol, Chinese Natl Engn Res Ctr Tissue Restorat & Recon, Hong Kong Branch, Kowloon, Hong Kong, Peoples R China
[3] Hong Kong Univ Sci & Technol, Dept Phys, Kowloon, Hong Kong, Peoples R China
[4] North Carolina State Univ, Dept Phys, Raleigh, NC 27695 USA
基金
美国国家科学基金会;
关键词
ELECTRON-ACCEPTORS; FULLERENE; POLYMER; PERFORMANCE; PHOTOVOLTAICS; GEOMETRY;
D O I
10.1021/jacs.7b09998
中图分类号
O6 [化学];
学科分类号
0703 ;
摘要
We report a novel small molecule acceptor (SMA) named FTTB-PDI4 obtained via ring-fusion between the thiophene and perylene diimide (PDI) units of a PDI-tetramer with a tetrathienylbezene (TTB) core. A small voltage loss of 0.53 V and a high power conversion efficiency of 10.58% were achieved, which is the highest value reported for PDI-based devices to date. By comparing the fused and nonfused SMAs, we show that the ring-fusion introduces several beneficial effects on the properties and performances of the acceptor material, including more favorable energy levels, enhanced light absorption and stronger intermolecular packing. Interestingly, morphology data reveal that the fused molecule yields higher domain purity and thus can better maintain its molecular packing and electron mobility in the blend. Theoretical calculations also demonstrate that FTTB-PDI4 exhibits a "double-decker" geometry with two pairs of mostly parallel PDI units, which is distinctively different from reported PDI-tetramers with highly twisted geometries and can explain the better performance of the material. This work highlights the promising design of PDI-based acceptors by the ring-fusion strategy.
引用
收藏
页码:16092 / 16095
页数:4
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