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研究生:陳軍翰
論文名稱:摻雜釤離子氧化鋅與單層過渡金屬二硫屬化合物薄膜之光譜性質研究
論文名稱(外文):Optical studies of Sm-doped ZnO and monolayer transition metal dichalcogenide thin film
指導教授:劉祥麟
學位類別:碩士
校院名稱:國立臺灣師範大學
系所名稱:物理學系
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:2018
畢業學年度:106
語文別:中文
論文頁數:135
中文關鍵詞:氧化鋅過渡金屬二硫屬化合物拉曼散射光譜橢圓偏振光譜
外文關鍵詞:ZnOTransition metal dichalcogenidesRaman scattering spectroscopySpectroscopic ellipsometry
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我們量測摻雜釤離子氧化鋅薄膜的拉曼散射光譜、穿透光譜及橢圓偏振光譜,研究不同摻雜濃度對氧化鋅薄膜光譜性質的影響。另外,我們量測單層過渡金屬二硫屬化合物薄膜(MoS2、MoSe2、WS2及WSe2)的變溫橢圓偏振光譜,探討單層過渡金屬二硫屬化合物薄膜的光譜性質。
未摻雜氧化鋅薄膜的拉曼散射光譜顯示兩個拉曼特徵峰,頻率位置為99.1 cm-1和437.9 cm-1,分別為E2(low)及E2(high)振動模,隨釤離子濃度上升,E2(low)藍移,E2(high)紅移,強度逐漸下降,並於釤離子濃度3%以上消失。穿透光譜顯示隨著釤離子濃度增加,紫外光區的透光率增加。吸收光譜展現隨著釤離子濃度增加,能隙逐漸藍移,我們分別以柏斯坦-莫斯位移理論(Burstein-Moss effect)及Zn1-xSmxO合金能帶結構解釋低濃度(≤5%)與高濃度(≥8%)摻雜樣品能隙之變化。
藉由分析變溫橢圓偏振光譜數據,我們取得單層過渡金屬二硫屬化合物薄膜之變溫折射率與消光係數能譜圖,隨著溫度上升,整體折射率與消光係數強度逐漸下降,結構紅移。我們觀察到所有樣品於近紅外與可見光區域皆有兩個明顯的吸收峰值,標記為A,B激子,為自由激子於布里淵區K(K´)點之躍遷。緊接在自由激子後的數個結構為電子於布里淵區Λ與M點之躍遷。所有樣品之光學能隙皆隨著溫度上升而紅移,A,B激子紅移,半高寬增寬。A,B激子之能量差為自旋耦合分裂能量,其不隨溫度變化而改變。
We investigated the samarium (Sm) doping effects on the optical properties of ZnO thin films and reported the temperature dependence spectroscopic ellipsometry studies of monolayer transition metal dichalcogenides thin films such as MoS2, MoSe2, WS2, and WSe2.

Room temperature Raman scattering spectrum of undoped ZnO thin film shows two phonon modes at approximately 99.1 cm-1 and 437.9 cm-1, displaying symmetries of E2(low) and E2(high). With increasing Sm doping, E2(low) mode shows a blueshift. By contrast, E2(high) mode shows a redshift. Furthermore, the intensities of these two phonon modes decrease and become completely diminished for the 3% Sm doped sample. The intensities of optical transmission spectra show an increase in the ultraviolet region and the band gap energy shows a blueshift as the Sm contents increases. We attributed this feature to the Burstein-Moss effect for 3% and 5% doped samples and the band characteristics of ternary Zn1-xSmxO alloys for 8% and 10% doped samples.

The temperature dependent refractive index and extinction coefficient spectra of monolayer transition metal dichalcogenides thin films were extracted from the ellipsometry parameters. Room temperature optical absorption spectra of these materials show two excitonic transitions (denoted as A and B excitons). They originate from the spin-split direct gap transitions at the K points of the Brillouin zone. Several high energy absorptions are associated with the electronic transitions at the Λ and M points. With increasing temperature, the intensity of refractive index decreases and the absorption structures show a redshift. Notably, the valence spin-orbit coupling is temperature independent.
目錄
致謝 i
摘要 iii
Abstract v
目錄 vii
圖目錄 ix
表目錄 xix
第一章 緒論 1
第二章 研究背景 3
2-1 摻雜釤離子氧化鋅文獻回顧 3
2-2 單層 MX2 (M = Mo, W;X = S, Se)薄膜文獻回顧 6
第三章 實驗儀器設備及基本原理 30
3-1 光譜儀系統 30
3-2 光譜分析原理介紹 34
3-2-1 全頻光譜原理 34
3-2-2 拉曼散射光譜原理 40
3-2-3 橢圓偏光光譜原理 43
第四章 樣品製備與特性 54
4-1 樣品製備 54
4-2 樣品特性 56
第五章 實驗結果與討論 68
5-1 摻雜不同濃度釤離子氧化鋅薄膜的光譜性質研究 68
5-2 單層MX2 (M = Mo, W;X = S, Se)薄膜變溫光譜性質研究 75
第六章 結論與未來展望 125
參考文獻 128
參考文獻
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