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Bloom FL, Kemerink M, Wagemans W, et al. Sign inversion of magnetoresistance in space-charge limited organic devices. Phys Rev Lett. 2009;103(6):066601doi: 10.1103/PhysRevLett.103.066601.
Bloom, F. L., Kemerink, M., Wagemans, W., & Koopmans, B. (2009). Sign inversion of magnetoresistance in space-charge limited organic devices. Physical review letters, 103(6), 066601. https://doi.org/10.1103/PhysRevLett.103.066601
Bloom, F L, et al. "Sign inversion of magnetoresistance in space-charge limited organic devices." Physical review letters vol. 103,6 (2009): 066601. doi: https://doi.org/10.1103/PhysRevLett.103.066601
Bloom FL, Kemerink M, Wagemans W, Koopmans B. Sign inversion of magnetoresistance in space-charge limited organic devices. Phys Rev Lett. 2009 Aug 07;103(6):066601. doi: 10.1103/PhysRevLett.103.066601. Epub 2009 Aug 06. PMID: 19792591.
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Phys Rev Lett. 2009 Aug 07;103(6):066601. doi: 10.1103/PhysRevLett.103.066601. Epub 2009 Aug 06.

Sign inversion of magnetoresistance in space-charge limited organic devices.

Physical review letters

F L Bloom, M Kemerink, W Wagemans, B Koopmans

Affiliations

  1. Department of Applied Physics, Center for NanoMaterials, Eindhoven University of Technology, 5600 MB Eindhoven, The Netherlands. [email protected]

PMID: 19792591 DOI: 10.1103/PhysRevLett.103.066601

Abstract

In this Letter, we explain the puzzling sign change of organic magnetoresistance in space-charge limited devices by device physics. We prove analytically and numerically that in the case of bipolar conduction with an Ohmic majority carrier and an injection limited minority carrier contact, a decrease in minority carrier mobility may give rise to an increase in the device current. It is shown that when the magnetic field acts to decrease the mobility of both carriers, a sign change in the magnetoconductivity as a function of applied bias may result. This behavior is in agreement with experimental observations.

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