Journal
SYNTHETIC METALS
Volume 205, Issue -, Pages 112-120Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.synthmet.2015.03.034
Keywords
Polymer; OPVs; DTFMMBI; PCDTFMMBI; Low band-gap
Funding
- National Research Foundation of Korea (NRF) grant - Korea Government (MEST) [NRF-2014R1A1A2055318]
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We synthesized new alternating conjugated polymers, PCDTFMMBI and PBDTDTFMMBI, which consist of trifluoromethyl substituted dimethy1-2H-benzimidazole (FMMBI) as new electron deficient unit, by palladium(0)-catalyzed Suzuki or Stille polymerization. Trifluoromethyl group has attractive features such as high solubility, chemical and thermal stability and strong electron withdrawing ability to adjust redox potentials. In addition to this, the introduction of trifluoromethyl group into benzimidazole unit will expand the absorption range into the longer wavelength region. Poly(4,8-bis(2-octyldodecyloxy) benzo[1,2-b:3,4-bylithiophene-alt-5,5-(2-methyl-4',7'-di-(2-thieny1)-2-(trifluoromethyl)-2H-benzimid-azole)) (PBDTDTFMMBI) film, in which benzodithiophene unit was introduced as the electron rich unit, showed an absorption onset at 932 nm, corresponding to a low band gap of 1.33 eV. Poly(N-9'-heptadecanyl-2,7-carbazole-alt-5,5-(2-methyl-4',7'-di-(2-thienyl)-2-(trifluoromethyl)-2H-benzimid-azole)) (PCDTFMMBI), with carbazole as the electron rich unit, showed low lying HOMO energy level of -5.69 eV. (C) 2015 Elsevier B.V. All rights reserved.
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