Journal
ORGANIC ELECTRONICS
Volume 23, Issue -, Pages 17-27Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.orgel.2015.04.005
Keywords
Donor-pi-acceptor conjugated polymer; Selenophene pi-bridge; Optoelectronic properties; Organic field effect transistors; Polymer solar cells
Funding
- National Natural Science Foundation of China [51303056, 21125419, 51323003, 51361165301]
- Guangdong Natural Science Foundation [S2012030006232]
- Research Fund for the Doctoral Program of Higher Education of China [20130172110005]
- South China University of Technology [2014ZM0005]
- Fundamental Research Funds for the Central Universities
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Two novel donor-pi-acceptor type of conjugated polymers with thiophene or selenophene as the pi-bridge between the electron-donating indolocarbazole and electron-accepting difluorobenzotriazole unit, were designed and synthesized through a palladium catalyzed Suzuki polymerization. The replacement of the thiophene bridge by selenophene shows negligible effects on the geometries of molecular chain, as indicated by theoretical calculation on the basis of density of functional theory. However, obvious bathochromic shift along with the increased intensity in the UV-vis absorption profile of selenophene based copolymers relative to their thiophene based counterparts are realized, as can be attributed to the more pronounced heavy atom effects of the selenium than the sulfur atom. Compared to the thiophene based copolymer, the selenophene based copolymer exhibited about one order of magnitude increase in hole mobility, from 0.0014 to 0.01 cm(2) V (1) s (1), and about two times of magnitude increase in power conversion efficiency, from 1.01% to 2.39%, as evaluated by field effect transistors and bulk heterojunction polymer solar cells, respectively. These results indicated that the selection of appropriate pi-bridge by is crucial for the improvement of performance of pi-conjugated polymers. (C) 2015 Elsevier B.V. All rights reserved.
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