Park, So Min Yoon, Youngwoon Jeon, Chan Woo Kim, Honggon Ko, Min Jae Lee, Doh-Kwon Kim, Jin Young Son, Hae Jung Kwon, Soon-Ki Kim, Yun-Hi Kim, BongSoo 2024-01-20T10:04:05Z 2024-01-20T10:04:05Z 2021-09-05 2014-03-15 0887-624X https://pubs.kist.re.kr/handle/201004/126996 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 English WILEY PHOTOVOLTAIC CELLS EFFICIENCY PERFORMANCE COPOLYMERS DESIGN SOLUBILITY ACENES Synthesis of Phenanthro[1,10,9,8-cdefg]carbazole-Based Conjugated Polymers for Organic Solar Cell Applications Article 10.1002/pola.27059 1 JOURNAL OF POLYMER SCIENCE PART A-POLYMER CHEMISTRY, v.52, no.6, pp.796 - 803 JOURNAL OF POLYMER SCIENCE PART A-POLYMER CHEMISTRY 52 6 796 803 scie scopus 000330854600007 2-s2.0-84893854740 Polymer Science Polymer Science Article PHOTOVOLTAIC CELLS EFFICIENCY PERFORMANCE COPOLYMERS DESIGN SOLUBILITY ACENES 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