期刊
ORGANIC ELECTRONICS
卷 14, 期 2, 页码 523-534出版社
ELSEVIER
DOI: 10.1016/j.orgel.2012.11.021
关键词
Poly(3-alkylthiophene); Random copolymer; Ester-functionalized side chain; Regioregular; Bulk heterojunction organic solar cell
资金
- Institute for the Promotion of Innovation through Science and Technology in Flanders (IWT-Vlaanderen)
- European Science Foundation (ESF)
- Fund for Scientific Research - Flanders (FWO) [G.0091.07]
- European Science Foundation (ESF) EUROCORES Program SONS II (CRP) [05-SONS-FP-021]
- FWO [G.0685.06]
The introduction of functional moieties in the donor polymer (side chains) offers a potential pathway toward selective modification of the nanomorphology of conjugated polymer:fullerene active layer blends applied in bulk heterojunction organic photovoltaics, pursuing morphology control and solar cell stability. For this purpose, two types of poly(3-alkylthiophene) random copolymers, incorporating different amounts (10/30/50%) of ester-functionalized side chains, were efficiently synthesized using the Rieke method. The solar cell performance of the functionalized copolymers was evaluated and compared to the pristine P3HT:PCBM system. It was observed that the physicochemical and opto-electronic characteristics of the polythiophene donor material can be modified to a certain extent via copolymerization without (too much) jeopardizing the OPV efficiency, as far as the functionalized side chains are introduced in a moderate ratio (<30%) and that preference is given to side chains with a small molar volume. A range of complementary techniques - UV-Vis spectroscopy, (modulated temperature) differential scanning calorimetry, transmission electron microscopy and X-ray diffraction analysis - indicated that variations in polymer crystallinity, while maintaining a high level of regioregularity, are probably the main factor responsible for the observed differences. (C) 2012 Elsevier B.V. All rights reserved.
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