電機資訊學院: 光電工程學研究所指導教授: 楊志忠翁啟銘Weng, Chi-MingChi-MingWeng2017-03-022018-07-052017-03-022018-07-052016http://ntur.lib.ntu.edu.tw//handle/246246/272808The controlling mechanism for determining the growth direction of a Ga-doped ZnO (GaZnO) nanoneedle (NN) by using an Ag nanoparticle (NP) as vapor-liquid-solid (VLS) growth catalyst in molecular beam epitaxy (MBE) is disclosed. It is found that the local Ag (111) orientation of the catalytic Ag portion in an Ag NP determines the ZnO (002) orientation of the grown GaZnO and hence the NN growth direction. The ZnO (002) plane of the grown GaZnO is always parallel with the Ag (111) planes of the Ag portions involved in VLS growth in either the top or bottom Ag NP of an NN. When GaN is used as NN growth template, at a sufficiently high temperature (350-450 oC), a small Ag NP can become a quasi-single crystal with its Ag (111) plane consistent with the GaN (002) plane and hence results in the growth of a vertical GaZnO NN. However, tilted NNs can be grown from a large Ag NP or a cluster of Ag NP on GaN due to its non-uniform Ag (111) orientation distribution. At the early stage of GaZnO growth, GaZnO precipitation can be observed between Ag layers within an Ag NP, indicating the growth of a semiconductor on Ag. On other templates, like Si, sapphire, or SiO2, single-crystal Ag NP cannot be formed such that GaZnO NNs of random orientations are grown.3984847 bytesapplication/pdf論文公開時間: 2019/7/26論文使用權限: 同意有償授權(權利金給回饋本人)穿透式電子顯微鏡氧化鋅奈米針Transmission Electron MicroscopyZnONanoneedlethesis10.6342/NTU201601176http://ntur.lib.ntu.edu.tw/bitstream/246246/272808/1/ntu-105-R02941107-1.pdf