標題: Intramolecular donor-acceptor regioregular poly(3-hexylthiophene)s presenting octylphenanthrenyl-imidazole moieties exhibit enhanced charge transfer for heterojunction solar cell applications
作者: Chang, Yao-Te
Hsu, So-Lin
Chen, Guan-Yu
Su, Ming-Hsin
Singh, Thounaojam Avinash
Diau, Eric Wei-Guang
Wei, Kung-Hwa
材料科學與工程學系
應用化學系
應用化學系分子科學碩博班
Department of Materials Science and Engineering
Department of Applied Chemistry
Institute of Molecular science
公開日期: 22-八月-2008
摘要: Intramolecular donor-acceptor structures prepared by covalently binding conjugated octylphenanthrenyl-imidazole moieties onto the side chains of regioregular poly(3-hexylthiophene)s exhibit lowered bandgaps and enhanced electron transfer compared to the parent polymer, e.g., conjugation of 90 mol% octylphenanthrenyl-imidazole moieties onto poly(3-hexylthiophene) chains reduces the optical bandgap from 1.91 to 1.80 eV, and the electron transfer probability is at least twice as high as that of pure poly(3-hexylthiophene) when blended with [6,6]-phenyl-C-61-butyric acid methyl ester. The lowered bandgap and the fast charge transfer both contribute to much higher external quantum efficiencies, thus much higher short-circuit current densities for copolymers presenting octylphenanthrenyl-imidazole moieties, relative to those of pure poly(3-hexylthiophene)s. The short-circuit current density of a device prepared from a copolymer presenting 90 mol% octylphenanthrenyl-imidazole moieties is 13.7 mA . cm(-2) which is an increase of 65% compared to the 8.3 mA . cm(-2) observable for a device containing pure poly(3-hexylthiophene). The maximum power conversion efficiency of this particular copolymer is 3.45% which suggest that such copolymers are promising polymeric photovoltaic materials.
URI: http://dx.doi.org/10.1002/adfm.200701150
http://hdl.handle.net/11536/8454
ISSN: 1616-301X
DOI: 10.1002/adfm.200701150
期刊: ADVANCED FUNCTIONAL MATERIALS
Volume: 18
Issue: 16
起始頁: 2356
結束頁: 2365
顯示於類別:期刊論文


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