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      Room-temperature larger-scale highly ordered nanorod imprints of ZnO film

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      Author
      Kyaw, Z.
      Wang J.
      Dev, K.
      Tiam Tan, S.
      Ju, Z.
      Zhang, Z.-H.
      Ji, Y.
      Hasanov, N.
      Liu W.
      Sun X.W.
      Demir, Hilmi Volkan
      Date
      2013
      Source Title
      Optics Express
      Print ISSN
      1094-4087
      Publisher
      Optical Society of American (OSA)
      Volume
      21
      Issue
      22
      Pages
      26846 - 26853
      Language
      English
      Type
      Article
      Item Usage Stats
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      Abstract
      Room-temperature large-scale highly ordered nanorod-patterned ZnO films directly integrated on III-nitride light-emitting diodes (LEDs) are proposed and demonstrated via low-cost modified nanoimprinting, avoiding a high-temperature process. with a 600 nm pitch on top of a critical 200 nm thick Imprinting ZnO nanorods of 200 nm in diameter and 200 nm in height continuous ZnO wetting layer, the light output power of the resulting integrated ZnO-nanorod-film/semi- transparent metal/GaN/InGaN LED shows a two-fold enhancement (100% light extraction efficiency improvement) at the injection current of 150 mA, in comparison with the conventional LED without the imprint film. The increased optical output is well explained by the enhanced light scattering and outcoupling of the ZnOrod structures along with the wetting film, as verified by the numerical simulations. The wetting layer is found to be essential for better impedance matching. The current-voltage characteristics and electroluminescence measurements confirm that there is no noticeable change in the electrical or spectral properties of the final LEDs after ZnO-nanorod film integration. These results suggest that the low-cost high-quality large-scale ZnOnanorod imprints hold great promise for superior LED light extraction. ©2013 Optical Society of America.
      Keywords
      Electric properties
      Electroluminescence
      Metallic films
      Nanoimprint lithography
      Nanorods
      Wetting
      Zinc oxide
      High temperature process
      Injection currents
      Light output power
      Light-extraction efficiency
      Nano-imprinting
      Room temperature
      Spectral properties
      Transparent metals
      Light emitting diodes
      Permalink
      http://hdl.handle.net/11693/27957
      Published Version (Please cite this version)
      http://dx.doi.org/10.1364/OE.21.026846
      Collections
      • Department of Electrical and Electronics Engineering 3524
      • Nanotechnology Research Center (NANOTAM) 1006
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