研究生: |
吳家榮 Jia-Rong Wu |
---|---|
論文名稱: |
矽晶圓上鍺電容器之高品質閘極氧化層 High-Quality Gate Oxide for Ge Capacitor Fabricated on Si Substrate |
指導教授: |
巫勇賢
Yung-Hsien Wu |
口試委員: | |
學位類別: |
碩士 Master |
系所名稱: |
原子科學院 - 工程與系統科學系 Department of Engineering and System Science |
論文出版年: | 2007 |
畢業學年度: | 95 |
語文別: | 中文 |
論文頁數: | 74 |
中文關鍵詞: | 鍺 |
相關次數: | 點閱:3 下載:0 |
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本論文中第一部份主要著重在矽晶圓上形成高濃度鍺 (Ge) 薄膜以及高品質的二氧化矽 (SiO2) 熱氧化層,實驗方法首先是在矽晶圓上蒸鍍鍺薄膜,並經由退火形成單晶矽鍺 (SiGe),後續使用濕式氧化爐管形成矽鍺氧化物 (SiGeOx),利用矽鍺氧化物在混合氣體 (forming gas) 中會還原成鍺的特性,實驗成功的形成了高濃度鍺薄膜,而因為鍺氧化物相當不穩定,所以矽鍺氧化物會不斷經由反應式GeO2 (in solution SiO2) + H2 --> Ge + H2O 將鍺析出,最終形成二氧化矽層。當結構完成之後,輔以材料分析如X射線繞射儀、二次離子質譜儀、穿透式電子顯微鏡、電子繞射圖等儀器針對磊晶鍺薄膜作定性分析,並發現到實驗中形成的鍺薄膜是單晶結構、高濃度且二氧化矽和鍺的介面是相當平坦的。
論文第二部分主要探討使用NH3、N2O、O2不同氣體處理對氧化層電性的影響,利用在第一部份形成的結構製作成NMOS以及PMOS之鍺電容器,並量測其閘極漏電流、電容電壓特性及磁滯特性曲線。我們發現經過NH3氮化後,雖然能夠有效的提高電容值,但是卻會惡化漏電流、增加電子陷阱 (electron trap) 等效應,然而NH3氮化之後如果再以N2O或O2來修補鍵結,就能夠擁有有效提高電容值、較低漏電流的好處。
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