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Preparation, Microstructure and Optical Properties of N-doped ZnO Nanocrystals

Author: YangJingZuo
Tutor: LiuYuXue
School: Northeast Normal University
Course: Condensed Matter Physics
Keywords: ZnO N-doped XRD Absorption Spectra photoluminescence SEM
CLC: TB383.1
Type: Master's thesis
Year: 2009
Downloads: 91
Quote: 1
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Abstract


ZnO has a hexagonal wurtzite structure,isⅡ-Ⅵwide band gap direct bandgap semiconductors.At room temperature,it has a band-gap width of 3.37 eV,a high exciton binding energy（60 meV） and an UV excitonic photoluminescence.ZnO has many physical properties similar to the nature of GaN and could be used in the application of efficient light-emitting devices.In this paper,N-doped ZnO nanocrystals were prepared using zinc acetate as zinc source and hexamethylenetetramine（HMT） as nitrogen source by hydrothermal method.,The microstructure and optical properties of N-doped ZnO nanocrystals were studied by X ray diffraction（XRD）,scanning electron microscopy（SEM）,photoluminescence（PL） and absorption spectra.XRD result showed that N-doped ZnO nanocrystals exhibited hexagonal structure.SEM observation showed ZnO nanosheets with the thickness of 15-25 nm.With increasing nitrogen concentration,microstructure of N-doped ZnO nanocrystals did not changed and the ratio of Iuv/Ivis firstly increased and then decreased.With the concentration of 2%,N-doped ZnO nanocrystals exhibited the best crystallinity.An obvious UV free excitonic absorption of N-doped ZnO nanocrystals could be observed.

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