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Simultaneous morphological stability and high charge carrier mobilities in donor–acceptor block copolymer/PCBM blends

Title data

Hufnagel, Martin ; Thelakkat, Mukundan:
Simultaneous morphological stability and high charge carrier mobilities in donor–acceptor block copolymer/PCBM blends.
In: Journal of Polymer Science Part B: Polymer Physics. Vol. 54 (2016) Issue 12 . - pp. 1125-1136.
ISSN 1099-0488
DOI: https://doi.org/10.1002/polb.24013

Project information

Project title:
Project's official titleProject's id
Umweltverträgliche Anwendungen der NanotechnologieNo information

Project financing: Bayerisches Staatsministerium für Wissenschaft, Forschung und Kunst

Abstract in another language

Donor–acceptor block copolymers (BCP), incorporating poly(3-hexylthiophene) (P3HT), and a polystyrene copolymer with pendant fullerenes (PPCBM) provide desired stable nanostructures, but mostly do not exhibit balanced charge carrier mobilities. This work presents an elegant approach to match hole and electron transport in BCP by blending with molecular PCBM without causing any macrophase separation. An insufficient electron mobility of PPCBM can be widely compensated by adding PCBM which is monitored by the space-charge limited current method. Using X-ray diffraction, atomic force microscopy, and differential scanning calorimetry, we verify the large miscibility of the PPCBM:PCBM blend up to 60 wt PCBM load forming an amorphous, molecularly mixed fullerene phase without crystallization. Thus, blending BCP with PCBM substantially enhances charge transport achieving an electron mobility of μe=(3.2 ± 1.7) × 10−4 cm2V−1s−1 and hole mobility of μh=(1.8 ± 0.6) × 10−3 cm2V−1s−1 in organic field-effect transistors (OFET). The BCP:PCBM blend provides a similarly high ambipolar charge transport compared to the established P3HT:PCBM system, but with the advantage of an exceptionally stable morphology even for prolonged thermal annealing. This work demonstrates the feasibility of high charge transport and stable morphology simultaneously in a donor–acceptor BCP by a blend approach. © 2016 Wiley Periodicals, Inc. J. Polym. Sci., Part B: Polym. Phys. 2016, 54, 1125–1136

Further data

Item Type: Article in a journal
Refereed: Yes
Keywords: block copolymers; charge transport; fullerenes; nanostructures; organic field-effect transistors
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 > Advanced Fields > Polymer and Colloid Science
Profile Fields > Emerging Fields > Energy Research and Energy Technology
Graduate Schools > Elite Network Bavaria > Macromolecular Science
Profile Fields
Profile Fields > Advanced Fields
Profile Fields > Emerging Fields
Graduate Schools
Graduate Schools > Elite Network Bavaria
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 06:31
Last Modified: 21 Jul 2016 06:18
URI: https://eref.uni-bayreuth.de/id/eprint/32862