Low bandgap copolymers based on monofluorinated isoindigo towards efficient polymer solar cells

Mirco Tomassetti; Farid Ouhib; Arnaud Wislez; Anne-Sophie Duwez; Huguette Penxten; Wouter Dierckx; Ilaria Cardinaletti; Ralf A. A. Bovee; Gijs W. P. van Pruissen; Christine Jérôme; Jean Manca; Wouter Maes; Christophe Detrembleur

doi:10.1039/C5PY00693G

Low bandgap copolymers based on monofluorinated isoindigo towards efficient polymer solar cells†

Mirco Tomassetti,^abc Farid Ouhib,^a Arnaud Wislez,^d Anne-Sophie Duwez,^d Huguette Penxten,^b Wouter Dierckx,^c Ilaria Cardinaletti,^c Ralf A. A. Bovee,^e Gijs W. P. van Pruissen,^e Christine Jérôme,^a Jean Manca,^f Wouter Maes*^bg and Christophe Detrembleur*^a

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^a Center for Education and Research on Macromolecules (CERM), University of Liège (Ulg), Chemistry Department, Sart-Tilman B6A, 4000 Liège, Belgium
E-mail: christophe.detrembleur@ulg.ac.be

^b Design & Synthesis of Organic Semiconductors (DSOS), Institute for Materials Research (IMO-IMOMEC), Hasselt University, Agoralaan 1 – Building D, 3590 Diepenbeek, Belgium
E-mail: wouter.maes@uhasselt.be

^c Material Physics Division, Hasselt University, Universitaire Campus – Wetenschapspark 1, 3590 Diepenbeek, Belgium

^d Nanochemistry and Molecular Systems, University of Liège (Ulg), Chemistry Department, Sart-Tilman B6a, 4000 Liège, Belgium

^e Molecular Materials and Nanosystems, Institute for Complex Molecular Systems, Eindhoven University of Technology, P.O. Box 513, 5600 MB Eindhoven, The Netherlands

^f X-Lab, Hasselt University, Agoralaan 1, B-3590 Diepenbeek, Belgium

^g IMEC, IMOMEC, Universitaire Campus – Wetenschapspark 1, B-3590 Diepenbeek, Belgium

Abstract

To explore the effectiveness of monofluorinated isoindigo as an electron-deficient building block in push–pull conjugated polymers for organic solar cell applications, four low bandgap copolymers are effectively synthesized and characterized. The effects of fluorine introduction, thiophene spacer length and polymer molar mass on the general electro-optical polymer characteristics, thin film blend microstructure and electronic performance are investigated. Isoindigo monofluorination effectively improves the power conversion efficiency from 2.8 up to 5.0% upon molar mass optimization, without using any processing additives or post-treatments.

Polymer Chemistry

Low bandgap copolymers based on monofluorinated isoindigo towards efficient polymer solar cells†

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Low bandgap copolymers based on monofluorinated isoindigo towards efficient polymer solar cells

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