Synthesis of phenanthro[1,10,9,8-cdefg]carbazole-based conjugated polymers for organic solar cell applications

Title
Synthesis of phenanthro[1,10,9,8-cdefg]carbazole-based conjugated polymers for organic solar cell applications
Authors
박소민윤영운전찬우김홍곤고민재이도권김진영손해정권순기김윤희김봉수
Keywords
Low bandgap; polymer solar cells; quinoxaline; push-pull type copolymer; power conversion efficiency; atomic force microscopy (AFM); conjugated polymers; degree of polymerization (DP); fullerenes; gel permeation chromatography
Issue Date
2014-03
Publisher
Journal of polymer science Part A, Polymer chemistry
Citation
VOL 52, NO 6, 796-803
Abstract
Low bandgap polymers with dithienylquinoxaline moieties based on 6H-phenanthro[1,10,9,8-cdefg]carbazole were synthesized via the Suzuki coupling reaction. Alkoxy groups were substituted at two different positions on the phenyl groups of the quinoxaline units of these polymers: in the para-position (PPQP) and in the meta-position (PPQM). The two polymers showed similar physical properties: broad absorption in the range of 400–700 nm, optical bandgaps of ∼1.8 eV, and the appropriate frontier orbital energy levels for efficient charge transfer/separation at polymer/PC71BM interfaces. However, the PPQM solar cell achieved a higher PCE due to its higher Jsc. Our investigation of the morphologies of the polymer:PC71BM blend films and theoretical calculations of the molecular conformations of the polymer chains showed that the polymer with the meta-positioned alkoxy group has better miscibility with PC71BM than the polymer with the para-positioned alkoxy group because the dihedral angle of its phenyl group with respect to the quinoxaline unit is higher. This higher miscibility resulted in a polymer:PC71BM blend film with a better morphology and thus in a higher PCE.
URI
http://pubs.kist.re.kr/handle/201004/48378
ISSN
0887624X
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