研究生: |
賴莉雯 |
---|---|
論文名稱: |
無應力矽鍺合金層的光學特性 |
指導教授: | 賈至達 |
學位類別: |
碩士 Master |
系所名稱: |
物理學系 Department of Physics |
論文出版年: | 2002 |
畢業學年度: | 90 |
語文別: | 中文 |
論文頁數: | 66 |
中文關鍵詞: | 應力 、矽鍺 、光學特性 |
論文種類: | 學術論文 |
相關次數: | 點閱:469 下載:3 |
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本論文使用了拉曼散射光譜和UV/VIS/IR反射光譜這兩種光學方法,來分析長在低溫成長矽(LT-Si)上的矽鍺合金層的特性,其矽的成長溫度從350oc到600oc。在拉曼散射光譜中,除了LT500oc(#323)樣品多了513cm-1的聲子訊號外,主要都可觀測到Ge-Ge(287.7cm-1)、Si-Ge(405cm-1)、Si-Si(503cm-1)、Si(520cm-1)等振動模的聲子訊號。由聲子的位置我們可以分析得知,除了#323樣品的矽鍺合金層受有局部不均勻的應力外,其餘五片樣品都是無應力作用的。另外,由反射光譜,我們也發現,只有#323樣品在2.7ev~3.6ev的能量範圍呈現Fano的譜圖,印證了其合金層有特殊的結構存在,這結構致使合金的E1能帶,提升到3.18ev。其餘五片,可以利用將反射光譜做KK轉換後所得到的介電係數( 和 )做二次微分,求得能帶E1=2.98ev,E1+Δ1=3.07ev。我們也可以間接地從Δ1<0.15ev,證實矽鍺合金無受應力的作用。
另外,我們還利用反射光譜中干涉效應的譜圖部份,擬合了矽鍺合金層的厚度;也利用拉曼光譜中Si和relaxed SiSi 振動模的聲子強度比,計算矽鍺合金層的吸收係數;並探討了溫度對聲子位置的效應。
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