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研究生: 劉錦淑
論文名稱: 硒化鎘鋅/硒化鋅 量子井系統的電光性質研究
Electrooptical properties of ZnCdSe/ZnSe quantum wells system
指導教授: 陸健榮
Lu, Chien-Rong
學位類別: 碩士
Master
系所名稱: 物理學系
Department of Physics
論文出版年: 2004
畢業學年度: 92
語文別: 中文
論文頁數: 88
中文關鍵詞: 量子井硒化鋅硒化鎘鋅
論文種類: 學術論文
相關次數: 點閱:203下載:11
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  • 本論文為研究硒化鎘鋅/硒化鋅(ZnCdSe/ZnSe)多重量子井樣品的電光性質。在光電導實驗中,譜形發生變化的能量位置約在ZnSe能隙附近,而在ZnCdSe與ZnSe能隙間譜形並無明顯變化。因而進行電場調制實驗及光激螢光實驗。
    在電場調制實驗中,觀察到ZnCdSe/ZnSe多重量子井樣品受應力作用後的井內能階躍遷訊號,並以量子井內束縛態之一階微分勞倫茲譜形加以擬合,兩者結果相符合;並利用K-P模型推算出量子井內的能階躍遷能量,計算結果符合電場調制的實驗結果。從譜圖中發現ZnCdSe/ZnSe多重量子井內的能階躍遷訊號,隨著溫度越低,訊號越為明顯,以50K的訊號最為顯著。
    在光激螢光實驗中,以高斯曲線加以擬合,發現隨著溫度升高,晶格受熱效應的影響,峰值能量往較低能量處移動,而螢光強度則隨溫度升高而逐漸減弱。

    摘要 ………………………………………………………………..……. 目錄 ………………………………………………………………..…….I 第一章 Ⅱ-Ⅵ族量子井系統簡介……………………………….………..1 第二章 光譜原理 2-1 電子躍遷理論……………………………………………………6 2-2 光學函數與電子躍遷的關係…………………………………....9 2-3 量子井系統的電子躍遷………………………………………..15 2-4 調制光譜的基本原理…………………………………………..16 2-5 電場調制………………………………………………………..21 2-6 弱電場調制……………………………………………………..25 2-7 束縛態的電場調制……………………………………………..27 2-8 光激螢光的機制……………….……………………………….28 2-9 光電導的基本原理…………….……………………………….31 參考文獻………………………………………….…………………34 第三章 實驗與結果 3-1 樣品結構………………………………………………………..36 3-2 光電導實驗及裝置…………………………..………...……….38 3-3 實驗控制程式設計…………….……………………………….44 3-4 光電導實驗的譜圖結果………………..………………............49 3-5 電場調制實驗及裝置…………………………………………..52 3-6 電場調制實驗的光譜結果……………………………………..55 3-7 光激螢光實驗及裝置…………………………………………..57 3-8 光激螢光實驗的光譜結果……………………………………..59 參考文獻………………………………………….………….……...60 第四章 譜形分析與討論 4-1 硒化鎘鋅合金成分對能隙的影響…………...………….…......61 4-2 受應力(strain)影響的量子井能帶結構分析…...………..….63 4-3 量子井的能階躍遷計算……...………………….……………..67 4-4 量子井內能階躍遷的計算結果與分析….……..………...........69 4-5 譜形分析……….……….………………………………………73 參考文獻……………………………………….…………….……...86 第五章 結論與展望………………………………………………………88 附錄: A.求解量子井內束縛態的Matlab程式……………………………….89 B.執行光電導實驗的程式VI….…………………………………….....90

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