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 |