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Title: Simultaneous Enhancement of Solar Cell Efficiency and Stability by Reducing the Side Chain Density on Fluorinated PCPDTQx Copolymers
Authors: Verstappen, Pieter 
Kesters, Jurgen 
D'Olieslager, Lien 
Drijkoningen, Jeroen 
Cardinaletti, Ilaria 
Vangerven, Tim 
Bruijnaers, Bardo J.
Willems, Robin E. M.
D'HAEN, Jan 
Manca, Jean 
Lutsen, Laurence 
Vanderzande, Dirk J. M. 
Maes, Wouter 
Issue Date: 2015
Source: MACROMOLECULES, 48 (12), p. 3873-3882
Abstract: The performance of polymer solar cells is strongly dependent on the morphology of the photoactive layer, which can be optimized by tuning the polymer side chain pattern. Whereas most studies focus on length and bulkiness, the side chain density receives much less attention. In this work, the effect of the number of side chains on PCPDTQx(2F) low bandgap copolymers on material properties and solar cell characteristics is investigated. The active layer morphology is strongly affected, affording more favorable finely intermixed blends when decreasing the side chain density. As a result, the efficiency increases to a maximum of 5.63% for the device based on the copolymer with intermediate side chain density. Moreover, removal of the side chains also has a positive effect on device stability under prolonged thermal stress. A single structural parameter alkyl side chain density is hence used for simultaneous enhancement of both solar cell efficiency and lifetime.
Notes: [Verstappen, Pieter; Kesters, Jurgen; Vanderzande, Dirk J. M.; Maes, Wouter] Hasselt Univ, Inst Mat Res IMO IMOMEC, DSOS, B-3590 Diepenbeek, Belgium. [Verstappen, Pieter; Kesters, Jurgen; D'Olieslaeger, Lien; Drijkoningen, Jeroen; Cardinaletti, Ilaria; Vangerven, Tim; D'Haen, Jan; Manca, Jean V.; Lutsen, Laurence; Vanderzande, Dirk J. M.; Maes, Wouter] IMOMEC, IMEC, B-3590 Diepenbeek, Belgium. [Kesters, Jurgen; D'Olieslaeger, Lien; Drijkoningen, Jeroen; Cardinaletti, Ilaria; Vangerven, Tim; D'Haen, Jan; Manca, Jean V.] Hasselt Univ, Inst Mat Res IMO IMOMEC, Elect & Phys Characterizat ELPHYC, ONE2,Mat Phys, B-3590 Diepenbeek, Belgium. [Bruijnaers, Bardo J.; Willems, Robin E. M.] Eindhoven Univ Technol, Inst Complex Mol Syst, Mol Mat & Nanosyst, NL-5600 MB Eindhoven, Netherlands.
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ISSN: 0024-9297
e-ISSN: 1520-5835
DOI: 10.1021/acs.macromol.5b00035
ISI #: 000356988700009
Rights: © 2015 American Chemical Society
Category: A1
Type: Journal Contribution
Validations: ecoom 2016
Appears in Collections:Research publications

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