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Ambipolar charge transport and electroluminescence properties of ZnO nanorods

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5 Author(s)
Wong, Chun-Yuen ; Department of Biology and Chemistry, City University of Hong Kong, Tat Chee Avenue, Kowloon, Hong Kong ; Lai, Lo-Ming ; Leung, Siu-Ling ; Roy, V.A.L.
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Hexagonal ZnO nanorod arrays have been prepared by a simple low-temperature ZnO-nanocrystal-assisted hydrothermal method. The photoluminescence spectrum of the ZnO nanorods features a weak band-edge emission at λmax∼3.3 eV and a strong broad yellow emission at λmax∼2.17 eV. Unlike the conventional reported n-type semiconducting property, our ZnO nanorods exhibit ambipolar charge transporting behavior. Using bottom contact field-effect transistor structure, the ZnO nanorods exhibit electron and hole mobilities up to 3.2 and 2.1 cm2 V-1 s-1, respectively. Electroluminescence in the visible region from the nanorod-based device has also been demonstrated.

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Applied Physics Letters  (Volume:93 ,  Issue: 2 )