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EDOT-diketopyrrolopyrrole copolymers for polymer solar cells

Title data

Wang, Chao ; Müller, Christian J. ; Gann, Eliot ; Liu, Amelia C. Y. ; Thelakkat, Mukundan ; McNeill, Christopher R.:
EDOT-diketopyrrolopyrrole copolymers for polymer solar cells.
In: Journal of Materials Chemistry A. Vol. 4 (2016) . - pp. 3477-3486.
ISSN 2050-7496
DOI: https://doi.org/10.1039/C5TA10078J

Project information

Project financing: Bayerisches Staatsministerium für Wissenschaft, Forschung und Kunst

Abstract in another language

The photovoltaic properties of a series of diketopyrrolo3{,}4-cpyrrole (DPP) copolymers containing 3{,}4-ethylenedioxythiophene (EDOT) as a comonomer are reported. With use of different aryl flanking units on the DPP core{,} namely thiophene{,} pyridine or phenyl{,} optical gaps ranging from 1.91 eV to 1.13 eV are achieved. When blended with the fullerene derivative 6{,}6-phenyl C71-butyric acid methyl ester (PC71BM){,} the thiophene-flanked copolymer PDPPT2-EDOT with an optical gap of 1.13 eV was found to have the best photovoltaic performance{,} with an efficiency of 2.5% in an inverted device architecture. Despite having the lowest open circuit voltage of the three polymers studied{,} PDPPT2-EDOT-based devices were able to achieve superior efficiencies due to the high short circuit current of up to similar15 mA cm-2. PDPPT2-EDOT-based devices also exhibit higher external quantum efficiencies which are associated with a superior microstructure - as revealed by transmission electron microscopy (TEM) and grazing incidence wide-angle X-ray scattering (GIWAXS) - which is associated with the enhanced aggregation tendency of PDPPT2-EDOT chains. In particular PDPPT2-EDOT : PC71BM blends were found to have a finer phase separated morphology with superior thin-film crystallinity. Surface morphology was also investigated with atomic force microscopy and near-edge X-ray absorption fine-structure spectroscopy.

Further data

Item Type: Article in a journal
Refereed: Yes
Institutions of the University: Faculties
Faculties > Faculty of Biology, Chemistry and Earth Sciences
Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Chemistry
Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Chemistry > Chair Macromolecular Chemistry I
Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Chemistry > Professorship Applied Functional Polymers > Professorship Applied Functional Polymers - Univ.-Prof. Dr. Mukundan Thelakkat
Profile Fields
Profile Fields > Advanced Fields
Profile Fields > Advanced Fields > Polymer and Colloid Science
Profile Fields > Emerging Fields
Profile Fields > Emerging Fields > Energy Research and Energy Technology
Research Institutions
Research Institutions > Collaborative Research Centers, Research Unit
Research Institutions > Collaborative Research Centers, Research Unit > SFB 840 Von partikulären Nanosystemen zur Mesotechnologie
Research Institutions > Collaborative Research Centers, Research Unit > SFB 840 Von partikulären Nanosystemen zur Mesotechnologie > SFB 840 - TP B 7
Graduate Schools
Graduate Schools > Elite Network Bavaria
Graduate Schools > Elite Network Bavaria > Macromolecular Science
Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Chemistry > Professorship Applied Functional Polymers
Result of work at the UBT: Yes
DDC Subjects: 500 Science
500 Science > 540 Chemistry
Date Deposited: 07 Jul 2016 07:14
Last Modified: 20 Oct 2016 06:07
URI: https://eref.uni-bayreuth.de/id/eprint/33034