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研究生:潘志豪
研究生(外文):Pan, Chih-Hao
論文名稱:以角解析光電子能譜研究不同長鏈狀分子於銀薄膜在鍺(111)基底上之介面電子結構
論文名稱(外文):The study of interfacial electronic structures of different long-chain molecules on top of the uniform silver thin films by ARPES
指導教授:唐述中
學位類別:碩士
校院名稱:國立清華大學
系所名稱:物理系
學門:自然科學學門
學類:物理學類
論文種類:學術論文
論文出版年:2013
畢業學年度:101
語文別:中文
論文頁數:74
中文關鍵詞:角解析光電子能譜有機薄膜銀薄膜功函數光電子能譜量子井態
外文關鍵詞:ARPESorganic thin filmsilver thin filmwork functionphotoemissionquantum well state
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我們研究TTC及PFT沉積於平整銀薄膜的系統,藉由角解析光電子能譜來觀察量子井態以及真空能階的偏移,探討有機薄膜與金屬薄膜的介面現象。隨著沉積有機分子於銀薄膜表面,改變了有機薄膜與銀薄膜介面,因此量子井態的能量位置會隨著有機薄膜的厚度而改變。我們藉由觀察真空能階的變化來了解介面現象,在我們研究的系統中,TTC與PFT沉積於銀薄膜表面真空能階偏移方向不同,我們認為造成的原因為兩分子的電子親和力不同。我們利用波爾-索莫菲量子化定則以及鏡像位能模型來求得有機薄膜的介電常數,我們比較單層PFT與TTC薄膜的介電常數發現PFT薄膜的介電常數有受到屏蔽效應的影響。
We have studied the system of TTC and PFT on uniform silver thin films. The interfacial properties between the organic molecules and the uniform silver thin film can be probed by the use of the angle-resolved photoemission spectroscopy (ARPES). After the deposition of the organic molecules onto the silver surface, we found the change of energy position of the QWS and the change of the vacuum level, and these phenomena can be attributed to the result of the change of the interfacial potential at the organic/metal interface. From our results, we found that the vacuum level shift toward opposite directions and these results might come from the difference of the electron affinity of TTC and the PFT. By introducing the Bohr-Sommerfeld quantization rule and the modified image potential model, the dielectric constant of the organic thin film can be extracted.
摘要 I

ABSTRACT II

致謝 III



1.導論 1

2.基礎理論 3

2.1表面態 3
2.2 量子井態 5
2.3 鏡像位能模型 8
2.4有機材料的電子結構 11
2.5介面電子結構 13
2.6 有機材料 17
2.6.1 Tetratetracontane (TTC) 分子 17
2.6.2 Perfluorotetracosane (PFT)分子 19

3.實驗儀器與原理 22

3.1超高真空 24
3.2 離子濺射槍 (sputter gun) 26
3.3 蒸鍍槍 (Knudsen cell) 27
3.4 低能量電子繞射儀 (LEED) 28
3.5 同步輻射光源 31
3.6 光電子能譜 33
3.6.1 簡介 33
3.6.2 光電效應理論模型 35
3.6.3 角解析光電子能譜 39
3.6.4 電子能量分析儀 42
3.6.5 接收模式 45
3.6.6 解析度 46

4.樣品製備與分析方法 47

4.1樣品製備 47
4.1.1清潔鍺(111)表面 47
4.1.2成長銀薄膜與沉積有機薄膜 49
4.2功函數量測與分析 52
4.3計算有機薄膜介電常數 55

5.實驗結果 58

5.1真空能階偏移(Vacuum Level Shift) 58
5.1.1 TTC分子/銀薄膜/鍺(111) 58
5.1.2 PFT分子/銀薄膜/鍺(111) 61
5.2 有機薄膜的介電常數 65
5.2.1 TTC薄膜介電常數 65
5.2.2 PFT薄膜介電常數 68

6.總結 71

參考資料 73

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[16] Che-Chia Hsu, Studies of the interfacial structure and behavior of QWS for a well-ordered ultrathin film of tetratetracontane (n-C44H90; TTC)/Ag thin film/Ge(111) by ARPES, Master thesis, National Tsing Hua University(2010)

[17] Chin-Yung Wang, Study of interfacial structure for thin films of TTC on uniform silver thin films by ARPES, Master thesis, National Tsing Hua University(2012)

[18] RADAK Furnance Installation and Operation Instructions

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[22] Andrea Damascelli, Physica Scripta. Vol. T109, 61–74, 2004

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