Unraveling the temperature and voltage dependence of magnetic field effects in organic semiconductors

P. Janssen, S.H.W. Wouters, M. Cox, B. Koopmans

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In recent years, it was discovered that the current through an organic semiconductor, sandwiched between two non-magnetic electrodes, can be changed significantly by applying a small magnetic field. This surprisingly large magnetoresistance effect, often dubbed as organic magnetoresistance (OMAR), has puzzled the young field of organic spintronics during the last decade. Here, we present a detailed study on the voltage and temperature dependence of OMAR, aiming to unravel the lineshapes of the magnetic field effects and thereby gain a deeper fundamental understanding of the underlying microscopic mechanism. Using a full quantitative analysis of the lineshapes, we are able to extract all linewidth parameters and the voltage and temperature dependencies are explained with a recently proposed trion mechanism. Moreover, explicit microscopic simulations show a qualitative agreement to the experimental results. (C) 2013 AIP Publishing LLC.
Original languageEnglish
Article number174909
Number of pages7
JournalJournal of Applied Physics
Issue number17
Publication statusPublished - 2013


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