| 研究生: |
馮國書 Feng, Kuo-shu |
|---|---|
| 論文名稱: |
吸附在Si (111)-7×7表面之CF4-nCln (n=1~3)分子受19~40 eV光子激發之解離研究 Photolysis Studies of CF4-nCln (n=1~3) adsorbed on Si (111)-7×7 by using 19~40 eV photons |
| 指導教授: |
溫清榕
Wen, Ching-Rong |
| 學位類別: |
碩士 Master |
| 系所名稱: |
理學院 - 物理學系 Department of Physics |
| 論文出版年: | 2009 |
| 畢業學年度: | 97 |
| 語文別: | 中文 |
| 論文頁數: | 82 |
| 中文關鍵詞: | 同步輻射 、光解 、脫附 、光電子能譜 、光子激發脫附 |
| 外文關鍵詞: | CF2Cl2, CF3Cl, CFCl3, PES, PSD |
| 相關次數: | 點閱:74 下載:1 |
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我們在新竹國家同步輻射研究中心以同步輻射光為光源,探討吸附在半導體基材Si(111)-7×7的三種分子 (CF3Cl、CF2Cl2與CFCl3 ),在溫度為30 K之下受到同步輻射光照射後所引發的一系列物理與化學特性。
首先我們以入射光子能量為29 eV,分別照射在注入量為0.3×1015分子/平方公分的CF3Cl/Si(111)表面上,注入量為0.2×1015分子/平方公分的CF2Cl2/Si(111)表面上,注入量為0.1×1015分子/平方公分的CFCl3/Si(111)表面上,獲得一系列的光電子能譜(PES)隨著時間變化的譜圖,然後加以分析光電子譜圖上出現的各個譜峰(peak)隨著光子照射時間而變化的意義,並且比較了三種分子譜圖上的光解截面之大小與其物理意義。
接著我們使用能量在19~40 eV區間連續掃描,間隔為0.1 eV的單色同步輻射光掃描兩種注入量(次單層0.3×1015分子/平方公分與多層0.8×1015分子/平方公分)的CF3Cl/Si(111)表面,取得一系列針對F+離子的光子激發脫附譜之譜圖,然後討論譜圖上對於F+離子脫附信號隨著光子照射時間增強的物理機制。
最後我們將注入量為0.3×1015分子/平方公分的 CF3Cl表面由實驗所得到的PSD譜圖與J.A. Yarmoff實驗團隊的研究成果[25]相比較,提出F+離子之脫附能閾隨著光子照射時間增加而變化的原因與F+離子如何從基材表面脫附的機制。
We use monochromatic synchrotron radiation in Shinchu NSRRC (National Synchrotron Radiation Research Center) as the light source to investigate the physical and chemical characters on the surface of Si(111)-7×7 at temperature 30 K, which dosed with CF3Cl、CF2Cl2 and CFCl3 molecules, respectively.
At first we use 29 eV photon to incident three different surface:0.3×1015molecules/cm2 CF3Cl、0.2×1015 molecules/cm2 CF2Cl2 and 0.1×1015molecules/cm2 CFCl3 dosed on the substrate Si(111)-7×7.
We obtain a series of sequential PES spectrum from the three surfaces, and we can analysis their peaks from these data. We further discuss by comparing their photolysis cross section between three series of sequential PES spectrum of CF3Cl、CF2Cl2 and CFCl3 dosed on the Si(111)-7×7 surface to study for the physical properties.
Next we use 19~40 eV photon to do a continuous scan on two different surfaces, submonolayer(0.3×1015molecules/cm2) and multilayer (0.8×1015molecules/cm2) CF3Cl dosed on Si(111)-7×7, the scan interval is 0.1 eV.
Then we obtain a series of continuous F+ PSD spectrum from the two surfaces, and then we discussing the physical mechanism of why F+ signal will increase with photon exposure.
At last, we compare our data with J.A. Yarmoff’s research group[25], and we present the reason of why F+ threshold in the PSD spectrum will change with photon exposure and how it desorb from the substrate Si(111)-7×7.(CF3Cl dose= 0.3×1015molecules/cm2)
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