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Spectroscopic evidence for trap-dominated magnetic field effects in organic semiconductors
Eindhoven University of Technology, Netherlands.
Eindhoven University of Technology, Netherlands.
University of Groningen, Netherlands.
Molecular Materials and Nanosystems, Eindhoven University of Technology, MB Eindhoven, The Netherlands.ORCID iD: 0000-0002-7104-7127
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2014 (English)In: Physical Review B. Condensed Matter and Materials Physics, ISSN 1098-0121, E-ISSN 1550-235X, Vol. 90, no 15, 155205Article in journal (Refereed) Published
Abstract [en]

Polaron traps are ubiquitous in organic semiconductors and recent evidence suggests they might be crucial for the large observed magnetic field effects (MFEs) in organic semiconductors. Here we measure MFEs in polymer thin-film devices with engineered, radiative trap sites in order to spectroscopically investigate the influence of the traps. Surprisingly, the luminescence at the trap sites and the polymer backbone is found to have an opposite response to a magnetic field. All our results are compatible with a mechanism in which spin mixing at the traps can create the large MFEs observed on the backbone. This scenario is quantitatively confirmed by numerical drift-diffusion modeling with magnetic-field-dependent exciton densities at the traps. These insights solve an outstanding controversy within the research field.

Place, publisher, year, edition, pages
American Physical Society , 2014. Vol. 90, no 15, 155205
National Category
Condensed Matter Physics
Identifiers
URN: urn:nbn:se:liu:diva-116204DOI: 10.1103/PhysRevB.90.155205ISI: 000344023900001OAI: oai:DiVA.org:liu-116204DiVA: diva2:797736
Note

Funding Agencies|Dutch Technology Foundation (STW), Netherlands Organization for Scientific Research (NWO)

Available from: 2015-03-25 Created: 2015-03-25 Last updated: 2017-12-04Bibliographically approved

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Kemerink, Martijn

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