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Title: Shape controlled Sn doped ZnO nanostructures for tunable optical emission and transport properties

Pure and Sn doped ZnO nanostructures have been grown on SiO{sub 2}/Si substrates by vapor-solid technique without using any catalysts. It has been found that the morphology of the nanostructures depend strongly on the growth temperature and doping concentration. By proper tuning of the growth temperature, morphology of pure ZnO can be changed from tetrapods to multipods. On the other hand, by varying the doping concentration of Sn in ZnO, the morphology can be tuned from tetrapods to flower-like multipods to nanowires. X-ray diffraction pattern reveals that the nanostructures have a preferred (0002) growth orientation, and they are tensile strained with the increase of Sn doping in ZnO. Temperature-dependent photoluminescence characteristics of these nanostructures have been investigated in the range from 10 to 300 K. Pure ZnO tetrapods exhibited less defect state emissions than that of pure ZnO multipods. The defect emission is reduced with low concentration of Sn doping, but again increases at higher concentration of doping because of increased defects. Transport properties of pure and Sn doped ZnO tetrapods have been studied using complex-plane impedance spectroscopy. The contribution from the arms and junctions of a tetrapod could be distinguished. Sn doped ZnO samples showed lower conductivity but highermore » relaxation time than that of pure ZnO tetrapods.« less
Authors:
 [1] ;  [2] ;  [3]
  1. Advanced Technology Development Centre, IIT Kharagpur, 721 302 (India)
  2. Department of Metallurgical and Materials Engineering, IIT Kharagpur, 721 302 (India)
  3. Department of Physics and Meteorology, IIT Kharagpur, 721 302 (India)
Publication Date:
OSTI Identifier:
22251456
Resource Type:
Journal Article
Resource Relation:
Journal Name: AIP Advances; Journal Volume: 3; Journal Issue: 11; Other Information: (c) 2013 Author(s); Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; CATALYSTS; DOPED MATERIALS; PHOTOLUMINESCENCE; QUANTUM WIRES; SILICON OXIDES; SPECTROSCOPY; SUBSTRATES; TEMPERATURE DEPENDENCE; X-RAY DIFFRACTION; ZINC OXIDES