Correspondence of the sign change in organic magnetoresistance with the onset of bipolar charge transport

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

Research output: Contribution to journalArticleAcademicpeer-review

44 Citations (Scopus)
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Abstract

In this work we examine the transition between positive and negative organic magnetoresistance in poly[2-methoxy-5-(3', 7' -dimethyloctyloxy)- p -phenylenevinylene] in order to understand how different regimes of charge transport affect the organic magnetoresistance effect. To characterize the charge transport in these devices we measured the current, low frequency differential capacitance, and electroluminescence efficiency as a function of voltage. These measurements show that the sign change of the magnetoresistance corresponds with a change from a unipolar diffusive transport below the built in voltage (Vbi) to a regime of bipolar drift transport above Vbi.
Original languageEnglish
Article number263302
Pages (from-to)263302-1/3
Number of pages3
JournalApplied Physics Letters
Volume93
Issue number26
DOIs
Publication statusPublished - 2008

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