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Solution-Processable Donor-Acceptor-Donor Oligomers with Cross-Linkable Functionality

Brotas, G. ; Costa, C. ; Dias, S.I.G. ; Costa, P. M. M. Costa ; Paolo, R. ; Farinhas, J. ; Alcácer, L. ; Morgado, J. ; Matos, M. ; Charas, A.

Macromolecular Chemistry and Physics Vol. 216, Nº 5, pp. 519 - 529, March, 2015.

ISSN (print): 1022-1352
ISSN (online): 1521-3935

Journal Impact Factor: 2,616 (in 2014)

Digital Object Identifier: 10.1002/macp.201400527

Abstract
Electron-acceptor units, combined with bithiophene substituted with flexible chains end-functionalized with cross-linkable moieties, provide soluble donor-acceptor-donor (DAD) π-conjugated oligomer-type molecules with cross-linking ability and broad absorption in the visible spectrum. A study on the cross-linking conditions of the new oligomers to yield insoluble polymer networks is presented, including conditions for obtaining polymer films over poly(3,4-ethylenedioxythiophene):polystyrene sulfonate-covered substrates. The combination of the DAD molecular design and cross-linking functionality opens prospects for applications in solution-processed small-molecule solar cells with morphologically-stable organic layers.