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Effects of carrier mobility and morphology in organic semiconductor spin valves

J. Appl. Phys. 105, 07C708 (2009); doi:10.1063/1.3068468

Published 27 February 2009

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Yaohua Liu,1 Taegweon Lee,2 Howard E. Katz,2 and Daniel H. Reich1
1Department of Physics and Astronomy, The Johns Hopkins University, Baltimore, Maryland 21218, USA
2Department of Materials Science and Engineering, The Johns Hopkins University, Baltimore, Maryland 21218, USA
We studied spin transport in four organic semiconductors (OSCs) with different electronic properties. Magnetoresistance (MR) effects were observed up to room temperature in junctions based on an electron-carrying OSC, tris(8-hyroxyquinoline) aluminum (Alq3) and a hole-carrying OSC, copper phthalocyanine (CuPc). The MR shows similar temperature dependence for these two OSCs. We also investigated junctions based on two high lateral mobility electron-carrying OSCs, 3,4,9,10-perylenetetracarboxylic dianhydride (PTCDA) and N,N[prime]-bis(4-trifluoromethylbenzyl)-1,4,5,8-naphthalenetetracarboxylic diimide (CF3-NTCDI). However, these junctions showed much weaker spin transport effects. Morphological studies suggest that these high mobility OSC films have much rougher surfaces than either Alq3 or CuPc, therefore the degradation of spin transport may originate from enhanced scattering due to the rougher FM/OSC interfaces. Our study shows that FM/OSC interfaces play an important role for spin transport in organic devices and need further exploration. ©2009 American Institute of Physics
History: Presented 11 November 2008; received 17 September 2008; accepted 5 November 2008; published 27 February 2009
Permalink: http://link.aip.org/link/?JAPIAU/105/07C708/1
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KEYWORDS and PACS

Keywords
PACS
  • 75.70.Cn
    Magnetic properties of interfaces
  • 85.70.Kh
    Magnetic thin film devices: magnetic heads (magnetoresistive, inductive, etc.); domain-motion devices, etc
  • 85.75.-d
    Magnetoelectronics; spintronics
  • 73.40.Ns
    Electrical properties of metal-nonmetal contacts
  • 75.47.Pq
    Magnetotransport phenomena in other materials
  • 72.20.Ee
    Mobility edges; hopping transport (semiconductors/insulators)
  • YEAR: 2009

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PUBLICATION DATA

ISSN:
0021-8979 (print)   1089-7550 (online)
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