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Please use this identifier to cite or link to this item: http://hdl.handle.net/1942/16917

Title: Enhanced open-circuit voltage in polymer solar cells by dithieno[3,2-b:2 ',3 '-d]pyrrole N-acylation
Authors: VANORMELINGEN, Wouter
KESTERS, Jurgen
VERSTAPPEN, Pieter
DRIJKONINGEN, Jeroen
KUDRJASOVA, Julija
Koudjina, Simplice
Liegéois, Vincent
Champagne, Benoît
MANCA, Jean
LUTSEN, Laurence
VANDERZANDE, Dirk
MAES, Wouter
Issue Date: 2014
Citation: JOURNAL OF MATERIALS CHEMISTRY A, 2 (20), p. 7535-7545
Abstract: A series of low bandgap copolymers composed of N-acyl-substituted dithieno[3,2-b:2′,3′-d]pyrroles (DTPs) as the electron rich donor constituents (with various alkyl side chain patterns) combined with different electron deficient acceptor building blocks are developed for polymer solar cell applications. Due to the introduction of the N-acyl substituents, the HOMO energy levels of the push–pull copolymers decrease as compared to the N-alkyl-DTP analogues, resulting in an increased open-circuit voltage (Voc) and hence solar cell performance. For an N-acyl-DTP-alt-thieno[3,4-c]pyrrole-4,6-dione (PDTP-TPD) copolymer a bulk heterojunction device with a Voc up to 0.80 V and a power conversion efficiency of 4.0% is obtained, the highest value for DTP-based polymer materials to date. Moreover, by implementation of a conjugated polyelectrolyte cathode interlayer the short-circuit current noticeably increases, enhancing the solar cell efficiency to 5.8%.
Notes: Maes, W (reprint author),Hasselt Univ, Inst Mat Res IMO IMOMEC, Agoralaan 1 Bldg D, B-3590 Diepenbeek, Belgium, wouter.maes@uhasselt.be
URI: http://hdl.handle.net/1942/16917
DOI: 10.1039/c4ta00525b
ISI #: 000334998400053
ISSN: 2050-7488
Category: A1
Type: Journal Contribution
Validation: ecoom, 2015
Appears in Collections: Research publications

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