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Please use this identifier to cite or link to this item: http://hdl.handle.net/1942/18689

Title: Fluorination as an effective tool to increase the open-circuit voltage and charge carrier mobility of organic solar cells based on poly(cyclopenta[2,1-b:3,4-b ']dithiophene-alt-quinoxaline) copolymers
Authors: VERSTAPPEN, Pieter
KESTERS, Jurgen
VANORMELINGEN, Wouter
HEINTGES, Gael
DRIJKONINGEN, Jeroen
VANGERVEN, Tim
MARIN, Lidia
Koudjina, Simplice
Champagne, Benoit
MANCA, Jean
LUTSEN, Laurence
VANDERZANDE, Dirk
MAES, Wouter
Issue Date: 2015
Publisher: ROYAL SOC CHEMISTRY
Citation: JOURNAL OF MATERIALS CHEMISTRY A, 3 (6), p. 2960-2970
Abstract: The effect of fluorination on the optoelectronic properties and the polymer : fullerene solar cell characteristics of PCPDTQx-type (poly{4-(2'-ethylhexyl)-4-octyl-4H-cyclopenta[2,1-b:3,4-b']-dithiophene-alt-2,3-bis[5'-(2 ''-ethylhexyl)thiophen-2'-yl]quinoxaline}) low bandgap copolymers is reported. The introduction of fluorine atoms on the quinoxaline constituents is an effective way to lower the HOMO and LUMO energy levels of the alternating copolymers, resulting in an enhanced open-circuit voltage for the devices based on the fluorinated polymers (similar to 0.1 V per F added). Furthermore, fluorination also improves the charge carrier mobility in the bulk heterojunction blends. Despite the formation of unfavorable photoactive layer morphologies, the best solar cell performance is obtained for the copolymer prepared from the difluorinated quinoxaline monomer, affording a power conversion efficiency of 5.26% under AM 1.5G irradiation, with an open-circuit voltage of 0.83 V, a short-circuit current density of 11.58 mA cm(-2) and a fill factor of 55%.
Notes: [Verstappen, Pieter; Kesters, Jurgen; Vanormelingen, Wouter; Heintges, Gael H. L.; Drijkoningen, Jeroen; Vangerven, Tim; Marin, Lidia; Manca, Jean; Vanderzande, Dirk; Maes, Wouter] Hasselt Univ, Inst Mat Res IMO IMOMEC, B-3590 Diepenbeek, Belgium. [Verstappen, Pieter; Kesters, Jurgen; Vanormelingen, Wouter; Heintges, Gael H. L.; Drijkoningen, Jeroen; Vangerven, Tim; Marin, Lidia; Manca, Jean; Lutsen, Laurence; Vanderzande, Dirk; Maes, Wouter] IMEC, IMOMEC, B-3590 Diepenbeek, Belgium. [Koudjina, Simplice; Champagne, Benoit] Univ Namur, Lab Chim Theor, B-5000 Namur, Belgium. wouter.maes@uhasselt.be
URI: http://hdl.handle.net/1942/18689
DOI: 10.1039/c4ta06054g
ISI #: 000348990500056
ISSN: 2050-7488
Category: A1
Type: Journal Contribution
Validation: ecoom, 2016
Appears in Collections: Research publications

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