Large magnetoresistance in nonmagnetic π-conjugated semiconductor thin film devices

Ö Mermer, G. Veeraraghavan, T. L. Francis, Y. Sheng, D. T. Nguyen, M. Wohlgenannt, A. Köhler, M. K. Al-Suti, M. S. Khan

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Abstract

Following the recent observation of large magnetoresistance at room temperature in polyfluorene sandwich devices, we have performed a comprehensive magnetoresistance study on a set of organic semiconductor sandwich devices made from different π-conjugated polymers and small molecules. The study includes a range of materials that show greatly different chemical structure, mobility, and spin-orbit coupling strength. We study both hole and electron transporters at temperatures ranging from 10 K to 300 K. We observe large negative or positive magnetoresistance (up to 10% at 300 K and 10 mT) depending on material and device operating conditions. We discuss our results in the framework of known magnetoresistance mechanisms and find that none of the existing models can explain our results.

Original languageEnglish
Article number205202
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume72
Issue number20
DOIs
Publication statusPublished - Nov 15 2005

ASJC Scopus subject areas

  • Condensed Matter Physics

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    Mermer, Ö., Veeraraghavan, G., Francis, T. L., Sheng, Y., Nguyen, D. T., Wohlgenannt, M., Köhler, A., Al-Suti, M. K., & Khan, M. S. (2005). Large magnetoresistance in nonmagnetic π-conjugated semiconductor thin film devices. Physical Review B - Condensed Matter and Materials Physics, 72(20), [205202]. https://doi.org/10.1103/PhysRevB.72.205202