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Issue 29, 2014
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Structural tuning of quinoxaline-benzodithiophene copolymers via alkyl side chain manipulation: synthesis, characterization and photovoltaic properties

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Abstract

We report here the synthesis and characterization of two novel semiconducting quinoxaline (FQ)-benzodithiophene (BDT) based copolymers, PFQBDT-TR1 and PFQBDT-T2R2, in which the BDT unit is substituted with either 2-octylthienyl (-TR1) or 2,3-dihexylthienyl (-T2R2), respectively, as side groups. The effect of the alkyl side chain(s), linked to the thienyl side groups, on the optical, electronic and morphological properties of the resulting polymers is investigated and correlated with the photovoltaic performance. Solution-processed BHJ solar cells, using these copolymers as electron donor materials and PC61BM (or PC71BM) as an electron acceptor counterpart, are prepared by a blade-coating technique under ambient conditions. As a result, power conversion efficiencies (PCEs) of ∼5.7% and ∼3.4% have been achieved for PFQBDT-TR1 and PFQBDT-T2R2 based devices, respectively, highlighting the crucial role of the alkyl portion of the π-conjugated side segment in the optoelectronic properties of this class of copolymers.

Graphical abstract: Structural tuning of quinoxaline-benzodithiophene copolymers via alkyl side chain manipulation: synthesis, characterization and photovoltaic properties

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Supplementary files

Article information


Submitted
27 Mar 2014
Accepted
01 May 2014
First published
10 Jun 2014

J. Mater. Chem. A, 2014,2, 11162-11170
Article type
Paper
Author version available

Structural tuning of quinoxaline-benzodithiophene copolymers via alkyl side chain manipulation: synthesis, characterization and photovoltaic properties

M. Tessarolo, D. Gedefaw, M. Bolognesi, F. Liscio, P. Henriksson, W. Zhuang, S. Milita, M. Muccini, E. Wang, M. Seri and M. R. Andersson, J. Mater. Chem. A, 2014, 2, 11162
DOI: 10.1039/C4TA01479K

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