Journal
MACROMOLECULES
Volume 44, Issue 4, Pages 894-901Publisher
AMER CHEMICAL SOC
DOI: 10.1021/ma1027164
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Funding
- Natural Science Foundation of China [50990065, 51010003, 51073058, 20904011]
- Ministry of Science and Technology, China (MOST) [2009CB623601]
- Fundamental Research Funds for the Central Universities, South China University of Technology [2009220012]
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A series of narrow-band-gap donor acceptor (D A) conjugated polymers, with thiophene-substituted quinoxaline monomer 5,8-bis(5-bromothiophen-2-yl)-2,3-bis(5-octylthiophen-2-yl)quinoxaline (TTQx) or its cyclized phenazine derivative monomer 8,1 1-bis(5-bromothiophen-2-yl)-2,5-dioctyldithieno[2,3-a:3',2'-c]phenazine (TTPz) as acceptors, were synthesized via Suzuki coupling reaction. It was found that the copolymers based on thiophene-substituted quinoxaline TTQx exhibit obviously red-shifted absorbance compared to previously reported D A copolymers based on phenyl-substituted quinoxaline. Their analogous copolymers based on the cyclized TT-Pz acceptor show more pronounced red-shifted absorption spectra with a significantly decreased band gap due to the enlarged planar polycyclic aromatic ring of TTPz. Moreover, compared to the copolymers based on TTQx, the TTPz-based copolymers' mobilities are also significantly increased due to the reduced steric hindrance and improved structural planarity among the copolymers. Bulk-heterojunction polymer solar cells based on the blends of the copolymers with a fullerene derivative as an acceptor exhibit promising performance, and the best device performance with power conversion efficiency up to 4.4% was achieved.
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