Dissertation
Dissertation > Mathematical sciences and chemical > Physics > Solid State Physics > Thin Film Physics > Film growth,structure and epitaxy

ZnO:Ag/Mg/Co Films Prepared by Chemical Bath Deposition

Author WuZiYang
Tutor CaiJinHua
School Shanghai Jiaotong University
Course Condensed Matter Physics
Keywords Chemical Bath Depostion ZnO film Ag/Mg/Co doping nanostructure photoluminescence
CLC O484.1
Type Master's thesis
Year 2008
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Zinc oxide (ZnO) film is a direct band gap semiconductor and has been used in various areas, such as transparent conductor, solar cell, Surface acoustic wave (SAW) device, UV laser, dilute magnetic semiconductor, etc. A new Chemical bath deposition (CBD) method, which is simple, low cost, and suitable for large area preparation, was used to prepare the ZnO films on glass substrates. The deposition recipe was optimized, and the structural, morphological and optical properties were investigated.Silver (Ag), Magnesium (Mg) and Cobalt (Co) doped ZnO films were also prepared using this CBD method by introducing Ag+, Mg2+ and Co2+ ions into the recipe. Scanning electron microscope (SEM) photographs showed that the lower concentration doped SZO (Ag doped ZnO) films had a nest namostructure constructed by chain-like attached nanoparticles. The nanostructure was found affected by Ag concentration in the deposition solution and the deposition temperature. A possible mechanism was proposed to interpret the formation of the special nanostructure. Photoluminescence (PL) spectra showed that Mg doping increases the ZnO luminescence intensity and Debye temperature. The PL intensity of CZO (Co doped ZnO) films were found with irregular temperature dependence. In some regions, the PL intensity was increased with the temperature increasing, and this effect was enhanced in the Mg, Co co-doped ZnO film. In addition, the crystal structure of the films was characterized by X-ray diffection, and the optical absorption was investigated by transmittance spectra. The optical band gaps of the doped and undoped ZnO films were fitted, and some important results were obtained.

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