Since the discovery of transparent conducting oxide (TCO) thin films¡ATCO has been widely used in optoelectronic devices. To increase the potential application of the TCO, this study aims at growing amorphous TCO thin films which possess visible transparency and high electric conductivity. Up to date, only IGZO exhibits these properties. However, the nature resource of indium, the main material in IGZO, is rare and expensive. In this study, searching for new materials that do not contain In, while manifest high transparent and conductivity is our major challenge. ZnO has an energy band gap of 3.4eV, for which visible photon does not have enough energy to excite the electron in ZnO from the valence band to conduction band. Therefore, it reveals itself as transparent. ZnO materials are relative stable in high temperature and chemical environments and thus a good candidate for been developed into amorphous TCO. The reason for the high conductivity in amorphous IGZO thin films is because the S orbital of In is spherical symmetry and has large radius in which can overlap with the next In ions to form a continuous band for conduction. In this study, a similar strategy is employed by use of the large S orbital of the doping tin (Sn) in ZnO. A ceramic ZnO target for the pulse laser deposition system is partially wrapped with tin foil. The optimum growth condition are searching by tuning oxygen partial pressure, laser energy, the distance between the target and substrate, and substrate temperature.

This thesis is divided into two parts. The main purpose of the first part is only to confirm further whether adding B can really improve the glass forming ability (GFA) and thermal stability. It is recently suggested that the addition of the even smaller sized B (0.08 nm) in the Mg65Cu25Y10 alloys to a certain level can further enhance GFA and provide the chance in fabricating larger bulk amorphous billet. The current study extends the concept of adding B to the Mg65Ni25Y10 based alloy, including the replacement of Ni by 1-5 at % (1, 3, and 5 at %) using the arc melting and melt spinning methods. The second part, this experiment drops magnesium element to 58 at% boldly, even lower, and the big element atom neodymium (Nd) improves to 11 at% or more upwards, different from everybody commonly used 65 at %, 25 at % , 10 at % as the main proportion composition , then to observe whether its supercooled liquid region

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Thesis (Ph. D.)--University of Texas at Austin, 2003. / Vita. Includes bibliographical references. Available also from UMI Company.

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Thesis (M.Sc.)--City University of Hong Kong, 2005. / At head of title: City University of Hong Kong, Department of Physics and Materials Science, Master of Science in materials engineering & nanotechnology dissertation. Title from title screen (viewed on Sept. 1, 2006) Includes bibliographical references.

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