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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 | Source: | 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 | Document URI: | http://hdl.handle.net/1942/16917 | DOI: | 10.1039/c4ta00525b | ISI #: | 000334998400053 | Rights: | This journal is © The Royal Society of Chemistry 2014. | Category: | A1 | Type: | Journal Contribution | Validations: | ecoom 2015 |
Appears in Collections: | Research publications |
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