期刊
JOURNAL OF POLYMER SCIENCE PART A-POLYMER CHEMISTRY
卷 52, 期 6, 页码 796-803出版社
WILEY
DOI: 10.1002/pola.27059
关键词
atomic force microscopy (AFM); conjugated polymers; degree of polymerization (DP); fullerenes; gel permeation chromatography; low bandgap; polymer solar cells; power conversion efficiency; push-pull type copolymer; quinoxaline
资金
- National Research Foundation of Korea (NRF)
- ministry of Education, Science, and Technology [2012047047]
- Korea Institute of Energy Technology Evaluation and Planning (KETEP)
- Ministry of Knowledge Economy (MKE) [20113030010060, 20113010010030, 20113020010070]
- Korea Research Council of Fundamental Science and Technology (KRCF)
- Korea Institute of Science and Technology (KIST)
- Korea Evaluation Institute of Industrial Technology (KEIT) [20113020010070, 20113030010060] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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 approximate to 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 J(sc). 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. (c) 2013 Wiley Periodicals, Inc. J. Polym. Sci., Part A: Polym. Chem. 2014, 52, 796-803
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