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Please use this identifier to cite or link to this item: http://hdl.handle.net/1942/18808

Title: N-acyl-dithieno[3,2-b:2 ',3 '-d]pyrrole-based low bandgap copolymers affording improved open-circuit voltages and efficiencies in polymer solar cells
Authors: KESTERS, Jurgen
VERSTAPPEN, Pieter
VANORMELINGEN, Wouter
DRIJKONINGEN, Jeroen
VANGERVEN, Tim
Devisscher, Dries
MARIN, Lidia
Champagne, Benoit
MANCA, Jean
LUTSEN, Laurence
VANDERZANDE, Dirk
MAES, Wouter
Issue Date: 2015
Publisher: ELSEVIER SCIENCE BV
Citation: SOLAR ENERGY MATERIALS AND SOLAR CELLS, 136, p. 70-77
Abstract: Three distinct low bandgap copolymers are synthesized by the combination of N-(2 '-propylpentanoyl)dithieno[3,2-b:2 ',3 '-d]pyrrole (DIP) and (fluorinated) 2,3-bis[5 '-(2 ''-ethylhexyl)thiophen-2 '-yl]quinoxaline (Qx) and these PDTPQx derivatives are investigated as electron donor materials in bulk heterojunction polymer solar cells. Due to the DTP N-acylation and the introduction of the Qx units, both the open-circuit voltage (Voc) and the short-circuit current density (Jsc) increase compared to previous devices based on DTP-type donor polymers. Organic solar cells with an average Voc of 0.67 V, a Jsc of 12.57 mA/cm(2) and a fill factor of 0.54 are obtained, affording a power conversion efficiency of 4.53% (4.81% for the top-performing device), a record value for (N-acyl-)DTP-based polymer solar cells devoid of special interlayer materials. Despite further enhancement of the Voc, the solar cell efficiency declines for the fluorinated PDTPQx copolymers because of the inability to achieve a finely intermixed bulk heterojunction blend nanomorphology. (C) 2015 Elsevier B.V. All rights reserved.
Notes: Corresponding author at: Design & Synthesis of Organic Semiconductors (DSOS), Institute for Materials Research (IMO-IMOMEC), Hasselt University, Agoralaan 1 – Building D, B-3590 Diepenbeek, Belgium. Tel.: þ32 11268312; fax: þ32 11268299. E-mail address: wouter.maes@uhasselt.be (W. Maes).
URI: http://hdl.handle.net/1942/18808
DOI: 10.1016/j.solmat.2014.12.037
ISI #: 000351802200010
ISSN: 0927-0248
Category: A1
Type: Journal Contribution
Validation: ecoom, 2016
Appears in Collections: Research publications

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