期刊
CHEMISTRY-A EUROPEAN JOURNAL
卷 25, 期 52, 页码 12137-12144出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/chem.201902302
关键词
conjugation; donor-acceptor systems; helical structures; isomers; photochemistry
资金
- National Natural Science Foundation of China (NSFC) [21801201, 51773160, 21502147]
- Wuhan University of Technology [40122004, 40120419, 35400907, 20411113]
Isomerism heavily influences the optoelectronic properties and self-assembly behavior of compounds and subsequently affects their device performance. Herein, two pairs of isomeric perylene diimide (PDI) dimers, PDI and PDI2, were designed and synthesized. The electron-deficient 9,10-anthraquinone group was employed as the bridge, and thus, the resultant dimers exhibited an acceptor-acceptor-acceptor (A-A-A) structure. To determine the isomeric effects on the optoelectronic properties and photovoltaic performance of these dimers, their absorptivity, luminescence, and redox behavior were studied. Bulk heterojunction organic solar cells based on these four dimers were fabricated and measured. The two PDI dimers exhibited clear differences in photovoltaic performance, whereas the two PDI2 analogues showed similar power conversion efficiencies (PCEs). The PCEs of the two PDI2 dimers are much higher than those of the PDI dimers. These results illustrate that the isomeric effect of PDI dimers is much larger than that of PDI2 dimers on the device performance, and proper expansion of conjugation could improve the device performance.
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