| 研究生: |
盧俊傑 Chun-Chieh Lu |
|---|---|
| 論文名稱: |
鈧含量與熱處理對Al-Sc薄膜微結構與表面型態之影響 Effects of Sc Contents and Heat Treatment on Microstructure and Surface Morphology of Al-Sc alloy films |
| 指導教授: |
李勝隆
Sheng-Long Lee |
| 口試委員: | |
| 學位類別: |
碩士 Master |
| 系所名稱: |
工學院 - 機械工程學系 Department of Mechanical Engineering |
| 畢業學年度: | 92 |
| 語文別: | 中文 |
| 論文頁數: | 42 |
| 中文關鍵詞: | 退火處理 、突起 、鋁薄膜 、Sc含量 |
| 外文關鍵詞: | Sc content, Al alloy films, hillock, annealing |
| 相關次數: | 點閱:10 下載:0 |
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鋁薄膜具有許多優異之特性,因此在半導體工業上廣泛應用於金屬導線的材料,但鋁薄膜在高溫環境下極易產生表面突起(hillock),此表面突起容易造成金屬導線短路;在光學反射層上,亦因表面突起的形成,致使反射率降低。
Sc元素加入純鋁或鋁合金中,可使合金明顯產生晶粒細化及提高再結晶溫度。基於Al-Sc合金的特性,本實驗設計純鋁及不同Sc含量之三種薄膜,分別為99.99%純鋁、Al-0.2wt.%Sc及Al-0.4wt.%Sc,在200-500℃之溫度下,施以1hr之退火處理,並以穿透式電子顯微鏡(TEM)、掃描式電子顯微鏡(SEM)、原子力顯微鏡(AFM)、熱壓應力量測及電阻率量測,探討純鋁及Al-Sc薄膜於剛沈積(as-deposited)狀態與不同退火溫度下的微結構及表面形態之變化。
實驗結果顯示,於剛沈積(as-deposited)狀態下,純鋁薄膜已存在大量表面突起;Al-Sc薄膜則因細晶強化之故,可抑制表面突起之形成,且抑制之效果隨薄膜中Sc含量增加而增加。於退火狀態下,純鋁及Al-Sc薄膜因熱壓應力的累積,致使新表面突起的形成,且形成突起之退火溫度隨薄膜中Sc含量增加而增高。純鋁薄膜於300℃以上之溫度退火,由於再結晶的發生,致使電阻率降低;Al-Sc薄膜於300℃以上之溫度退火,因Al3Sc相析出及晶粒輕微成長,電阻率降低至與純鋁薄膜相近。
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