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Separating positive and negative magnetoresistance in organic semiconductor devices
Eindhoven University of Technology, Netherlands; Eindhoven University of Technology, Netherlands.
Eindhoven University of Technology, Netherlands; Eindhoven University of Technology, Netherlands.
Linköping University, Department of Physics, Chemistry and Biology, Chemical and Optical Sensor Systems. Linköping University, The Institute of Technology.ORCID iD: 0000-0002-7104-7127
Eindhoven University of Technology, Netherlands; Eindhoven University of Technology, Netherlands.
2007 (English)In: Physical Review Letters, ISSN 0031-9007, E-ISSN 1079-7114, Vol. 99, no 25, 257201Article in journal (Refereed) Published
Abstract [en]

We study the transition between positive and negative organic magnetoresistance (OMAR) in tris-(8 hydroxyquinoline) aluminium (Alq(3)), in order to identify the elementary mechanisms governing this phenomenon. We show how the sign of OMAR changes as function of the applied voltage and temperature. The transition from negative to positive magnetoresistance (MR) is found to be accompanied by an increase in slope of log(I) versus log(V). ac admittance measurements show this transition coincides with the onset of minority charge (hole) injection in the device. All these observations are consistent with two simultaneous contributions with opposite sign of MR, which may be assigned to holes and electrons having different magnetic field responses.

Place, publisher, year, edition, pages
American Physical Society , 2007. Vol. 99, no 25, 257201
National Category
Physical Sciences
Identifiers
URN: urn:nbn:se:liu:diva-118196DOI: 10.1103/PhysRevLett.99.257201ISI: 000251887100056OAI: oai:DiVA.org:liu-118196DiVA: diva2:813500
Available from: 2015-05-22 Created: 2015-05-22 Last updated: 2015-06-01

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Kemerink, Martijn
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