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On the role of minority carriers in the frequency dependence of organic magnetoresistance
Eindhoven University of Technology, Netherlands.
Eindhoven University of Technology, Netherlands.
Eindhoven University of Technology, Netherlands.
Eindhoven University of Technology, Netherlands.
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2011 (English)In: Synthetic metals, ISSN 0379-6779, E-ISSN 1879-3290, Vol. 161, no 7-8, 617-621 p.Article in journal (Refereed) Published
Abstract [en]

In this work we investigate the frequency dependence of organic magnetoresistance (OMAR) both in small molecule-based (Alq3) and polymer (PPV derivative) materials, and investigate its thickness dependence. For all devices, we observed a strong decrease in magnetoconductance (MC) with increasing frequency of the ac component of the applied magnetic field. Moreover, we observed a strong reduction of the cut-off frequencies for increasing film thickness. By means of admittance spectroscopy and device simulations, we show that the cut-off frequency is related to the inverse transit time of the minority charge carriers. These observations confirm the important role of minority carriers in OMAR, and show that changes in OMAR are not only due to microscopic mechanisms, but also device physics is of significant relevance. (C) 2011 Elsevier B.V. All rights reserved.

Place, publisher, year, edition, pages
Elsevier , 2011. Vol. 161, no 7-8, 617-621 p.
Keyword [en]
Organic semiconductor; Magnetoresistance; Carrier mobility; Minority carriers; Transit time
National Category
Condensed Matter Physics
Identifiers
URN: urn:nbn:se:liu:diva-141466DOI: 10.1016/j.synthmet.2011.01.013ISI: 000290424900014OAI: oai:DiVA.org:liu-141466DiVA: diva2:1145750
Conference
3rd International Meeting on Spins in Organic Semiconductors (SPINOS III)
Available from: 2017-09-29 Created: 2017-09-29 Last updated: 2017-10-06

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Kemerink, M.
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