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Study on Electrodeposition and Optical Properties of Functional Nanocrystalline Metal Oxide Thin Films

Author: HanXiaoZuo
Tutor: XuZhuDe；LiuRun
School: Zhejiang University
Course: Physical and chemical
Keywords: Electrodeposition CdO films CdO2 film ZnO thin films ZnO2 film Semiconductor Nanocrystals
CLC: TB383.1
Type: Master's thesis
Year: 2006
Downloads: 228
Quote: 3
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Abstract


In recent years, the semiconductor optoelectronic functional materials and devices is the foundation and core of modern information industry has become a current research focus, and solid-state nanodevices based on low-dimensional semiconductor microstructures materials. Preparation of low-dimensional semiconductor nanodevices progress depends on the growth of low-dimensional structure of materials and nanofabrication technology, nanostructured materials quality depends largely on the level of growth and preparation techniques. Electrodeposition a liquid electrochemical deposition methods, history has been preparing various polycrystalline thin films and nanostructures. Electrodeposition is usually carried out under the conditions of room temperature or slightly above room temperature, and is therefore very suitable for preparing nano-structure; the amount of deposition is controlled by the Faraday's law; overpotential deposition speed can be controlled, the greater the overpotential, the faster the deposition rate; Furthermore, electrodeposition is an economical deposition method. The ZnO as is a remarkably versatile functional materials, a large number of important industrial electronics, coatings, catalytic technology. In this paper, first electrodeposition method, the aqueous solution at room temperature deposition of thin-film layer of ZnO 2 . XRD, TG / DSC confirmed that the resultant product is the of ZnO 2 instead in Zn (OH) of 2 observed by SEM the of ZnO 2 small nanostructures. Then the ZnO electrodeposition 2 as a precursor in the 200 ℃, 300 ℃, 400 ℃ thermal decomposition of 4 hours nano-ZnO films. The products were characterized by SEM, XRD, UV-vis and PL, and the calculated band gap of ZnO thin films obtained by this method. Found that the ZnO film particles larger with increasing temperature, UV and PL spectra are red shift. CdO as a typical functional materials have a wide range of applications in light absorption, photoelectric conversion, nonlinear optics, photocatalysis and sensors. In this paper, the first electricity deposition method layer of CdO 2 thin film deposition in aqueous solution under ambient conditions. XRD, TG / DSC confirmed that the resulting product was the CdO 2 , instead of Cd (OH) 2 observed by SEM of CdO 2 small nanostructures. Then CdO 2 400 ℃ thermal decomposition of four hours of CdO as precursor film electrodeposition. The products were characterized using SEM, XRD and UV-Vis, and calculates the forbidden band width of the CDO film obtained by this method. Cd (1-x) Zn x O is an important class of ternary semiconductor material to change the stoichiometric formula can adjust its physical and chemical properties. In this paper, by electrochemical deposition step synthesis the nano of Cd 0.63 Zn 0.37 O 2 and

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CLC: > Industrial Technology > General industrial technology > Materials science and engineering > Special structural materials
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