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Title: Ester-functionalized poly(3-alkylthiophene) copolymers: Synthesis, physicochemical characterization and performance in bulk heterojunction organic solar cells
Authors: Campo, Bert J.
Bevk, David 
Kesters, Jurgen 
Gilot, Jan
Bolink, Henk J.
Zhao, Jun
Bolsee, Jean-Christophe 
Oosterbaan, Wibren D. 
Bertho, Sabine 
D'Haen, Jan 
Manca, Jean 
Lutsen, Laurence 
Van Assche, Guy
Maes, Wouter 
Janssen, Rene A. J.
Vanderzande, Dirk 
Issue Date: 2013
Source: ORGANIC ELECTRONICS, 14 (2), p. 523-534
Abstract: The introduction of functional moieties in the donor polymer (side chains) offers a potential pathway toward selective modification of the nanomorphology of conjugated polymer:fullerene active layer blends applied in bulk heterojunction organic photovoltaics, pursuing morphology control and solar cell stability. For this purpose, two types of poly(3-alkylthiophene) random copolymers, incorporating different amounts (10/30/50%) of ester-functionalized side chains, were efficiently synthesized using the Rieke method. The solar cell performance of the functionalized copolymers was evaluated and compared to the pristine P3HT:PCBM system. It was observed that the physicochemical and opto-electronic characteristics of the polythiophene donor material can be modified to a certain extent via copolymerization without (too much) jeopardizing the OPV efficiency, as far as the functionalized side chains are introduced in a moderate ratio (<30%) and that preference is given to side chains with a small molar volume. A range of complementary techniques - UV-Vis spectroscopy, (modulated temperature) differential scanning calorimetry, transmission electron microscopy and X-ray diffraction analysis - indicated that variations in polymer crystallinity, while maintaining a high level of regioregularity, are probably the main factor responsible for the observed differences. (C) 2012 Elsevier B.V. All rights reserved.
Notes: [Campo, Bert J.; Bevk, David; Kesters, Jurgen; Oosterbaan, Wibren D.; Lutsen, Laurence; Maes, Wouter; Vanderzande, Dirk] Hasselt Univ, Inst Mat Res IMO IMOMEC, B-3590 Diepenbeek, Belgium. [Gilot, Jan; Janssen, Rene A. J.] Eindhoven Univ Technol, NL-5600 MB Eindhoven, Netherlands. [Bolink, Henk J.] Univ Valencia, Inst Ciencia Mol, E-46071 Valencia, Spain. [Zhao, Jun; Van Assche, Guy] Vrije Univ Brussel, B-1050 Brussels, Belgium. [Bolsee, Jean-Christophe; Bertho, Sabine; D'Haen, Jan; Manca, Jean] Hasselt Univ, Inst Mat Res IMO IMOMEC, Organ & Nanostruct Elect & Energy Convers ONE2 El, B-3590 Diepenbeek, Belgium. [Manca, Jean; Lutsen, Laurence; Vanderzande, Dirk] IMEC, IMOMEC Ass Lab, B-3590 Diepenbeek, Belgium.
Keywords: Materials Science, Multidisciplinary; Physics, Applied;Poly(3-alkylthiophene); Random copolymer; Ester-functionalized side chain; Regioregular; Bulk heterojunction organic solar cell
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ISSN: 1566-1199
e-ISSN: 1878-5530
DOI: 10.1016/j.orgel.2012.11.021
ISI #: 000314658700014
Category: A1
Type: Journal Contribution
Validations: ecoom 2014
Appears in Collections:Research publications

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