none Exploration of new methods for growing Ag films on Au(111) studied by ARPES

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题名:	none Exploration of new methods for growing Ag films on Au(111) studied by ARPES
作者:	蔡季廷;Chi-Ting Tsai
贡献者:	物理研究所
关键词:	量子井;Ag/Au(111) quantum well state
日期:	2007-07-06
上传时间:	2009-09-22 10:59:11 (UTC+8)
出版者:	國立中央大學圖書館
摘要:	薄膜系統在工業科技上或是科學研究上都扮演著重要的角色，然而製備大尺度平坦薄膜卻不是件容易的事，我們的動機是尋找一個方法能製備大尺度平坦薄膜。我們所採用的系統是Ag/Au(111)系統，電子被限制在銀薄膜裡或是表面上形成量子化的能態，利用角度解析光電子能譜術與量子化能態對厚度上的關係來解析薄膜厚度上的分佈。我們所採取製備薄膜的方法為在低溫下蒸鍍銀原子，並且緩慢回溫至接近室溫，在銀薄膜厚度較小的情況下，可使用表面態來解析厚度上的分佈，在銀薄膜較厚的情況下因表面態對厚度的變化量很小，需藉著其他量子態來解析厚度。實驗結果顯示低溫下蒸鍍再回溫的方法是一個製備平坦薄膜的方法，在回溫的過程中，觀察角度解析光電子能譜我們發現一些有趣的新現象，並嘗試用物理模型來解釋。 Thin film systems play important roles in technology industry and scientific investigation. However, preparing atomically flat thin films over a macroscopic region is not an easy thing. Our motivation is trying to find a new method for growing flat thin films over a macroscopic region. The system in our investigation we used is Ag/A2u(111) quantum well system. Electron confinement inside Ag films causes quantization of electronic energy states. We use angle resolved photoelectron spectroscopy to investigate the thickness variation of thin films. The method we adopted is low temperature deposition and annealing to near room temperature. In the low coverage case, it could use the surface state to resolve the thickness variation. However in the high coverage case, it must use quantum well states to resolve. The results of our experiments show that low temperature deposition and annealing process is a good way to prepare flat thin films. The photoelectron spectra at different temperature measured during the annealing process shows some interesting physical phenomenon. We have a physical model to explain this phenomenon.
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