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Kim, Jin Young
Next Generation Energy Laboratory
Research Interests
  • Polymer solar cells, QD solar cells, organic-inorganic hybrid solar cells, perovskite solar cells, OLEDs, PeLEDs, organic FETs

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Trifluoromethyl benzimidazole-based conjugated polymers with deep HOMO levels for organic photovoltaics

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Title
Trifluoromethyl benzimidazole-based conjugated polymers with deep HOMO levels for organic photovoltaics
Author
Shim, Joo YoungKim, TaehyoKim, Jin YoungKim, JuaeKim, IlKim, JinwooSuh, Hongsuk
Issue Date
2015-07
Publisher
ELSEVIER SCIENCE SA
Citation
SYNTHETIC METALS, v.205, pp.112 - 120
Abstract
We synthesized new alternating conjugated polymers, PCDTFMMBI and PBDTDTFMMBI, which consist of trifluoromethyl substituted dimethyl-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-b]dithiophene-alt-5,5-(2-methyl-4′,7′-di-(2-thienyl)-2-(trifluoromethyl)-2H-benzimidazole)) (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-benzimidazole)) (PCDTFMMBI), with carbazole as the electron rich unit, showed low lying HOMO energy level of -5.69 eV.
URI
https://scholarworks.unist.ac.kr/handle/201301/11542
URL
http://www.sciencedirect.com/science/article/pii/S0379677915001514
DOI
10.1016/j.synthmet.2015.03.034
ISSN
0379-6779
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