文化大學機構典藏 CCUR:Item 987654321/24099
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    题名: Field emission and optical properties of Ga-doped ZnO nanowires synthesized via thermal evaporation
    作者: Chang, LW (Chang, Li Wei)
    Yeh, JW (Yeh, Jien Wei)
    Cheng, CL (Cheng, Chia Liang)
    Shieu, FS (Shieu, F.S.)
    Shih, HC (Shih, Han C.)
    贡献者: Inst Mat Sci & Nanotechnol
    关键词: Nanowires
    Optical properties of low-dimensional structures
    Field emission
    日期: 2011-01-15
    上传时间: 2013-01-30 14:09:35 (UTC+8)
    摘要: Ga-doped ZnO (GZO) nanowires have been synthesized by thermal evaporation with gallium metal as the dopant source. The morphology, microstructure and chemical composition were determined by field emission scanning electron microscopy (FE-SEM), X-ray diffraction, high-resolution transmission electron microscopy (HRTEM), electron paramagnetic resonance (EPR), and X-ray photoelectron spectroscopy (XPS). The investigation confirmed that the GZO nanowires were the wurtzite hexagonal structures. These doped nanowires have diameters in the range 30-70 nm and lengths of several hundreds of nanometers with growth direction along the (1 0 0) crystal plane. The optical properties from the cathodoluminescence (CL) and photoluminescence (PL) spectrum show that GZO nanowires exhibit a relative weak ultraviolet emission (UV) and a strong green emission. The UV emission for ZnO and GZO nanowires is attributed to near band-edge emission from recombination of free excitons. Furthermore, the green emission is attributed to oxygen vacancy and gallium impurity energy levels. Field emission measurements demonstrate that the GZO possesses good performance with a turn-on field of 3.4 V/mu m at a current density of 10 mu A/cm(2), a threshold field of 5.4 V/mu m at a current density of 1 mA/cm(2), and a field-enhancement factor beta of 5945. These results are very helpful for the design, fabrication and optimization of integrated optoelectronic nanodevices using GZO nanowires. (C) 2010 Elsevier B.V. All rights reserved.
    關聯: APPLIED SURFACE SCIENCE 卷: 257 期: 7 頁數: 3145-3151
    显示于类别:[化學工程與材料工程學系暨碩士班] 期刊論文

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