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Effect of electron-withdrawing side chain modifications on the optical properties of thiophene-quinoxaline acceptor based polymers

Renee Kroon (Institutionen för kemi- och bioteknik, Polymerteknologi) ; Angelica Lundin (Institutionen för kemi- och bioteknik, Polymerteknologi) ; Camilla Lindqvist (Institutionen för kemi- och bioteknik, Polymerteknologi) ; Patrik Henriksson (Institutionen för kemi- och bioteknik, Polymerteknologi) ; Timothy Steckler (Institutionen för kemi- och bioteknik, Polymerteknologi) ; Mats R. Andersson (Institutionen för kemi- och bioteknik, Polymerteknologi)
Polymer (0032-3861). Vol. 54 (2013), 4, p. 1285-1288.
[Artikel, refereegranskad vetenskaplig]

Four new thiophene-quinoxaline acceptor based polymers have been synthesized. The parent thiophene-quinoxaline acceptor based copolymer was modified by introducing different electron-withdrawing groups adjacent to the thiophene side group. The effect on the physical, electrochemical and optical properties of the polymer series is discussed with respect to the parent thiophene-quinoxaline acceptor based polymer. The side chain carbonyl from one modified monomer could conveniently be transformed to either a difluoromethylene or an -ylidene malononitrile group via carbonyl transformations. For all polymers incorporating an electron-withdrawing side group both the HOMO and especially the LUMO were significantly shifted away from vacuum while all exhibit enhanced light harvesting ability. Especially the incorporation of an -ylidine malononitrile side group increases both the spectral coverage and absorption coefficient. Incorporation of a difluoromethylene side group resulted in a twofold increase of the molecular weight compared to the parent polymer structure.

Nyckelord: Conjugated polymers, Side chain modification, Energy level engineering, pi-conjugated polymers, solar-cells, performance

Denna post skapades 2013-03-19.
CPL Pubid: 174817


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Institutioner (Chalmers)

Institutionen för kemi- och bioteknik, Polymerteknologi (2005-2014)



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