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研究生: 施仁智
論文名稱: 並五苯(pentacene)薄膜系統縱向電場調制光譜研究
指導教授: 陸健榮
學位類別: 碩士
Master
系所名稱: 物理學系
Department of Physics
論文出版年: 2007
畢業學年度: 95
語文別: 中文
論文頁數: 102
中文關鍵詞: 並五苯調制光譜有機半導體
英文關鍵詞: pentacene, electroabsorption
論文種類: 學術論文
相關次數: 點閱:128下載:17
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  • 我們利用電場調制光譜實驗研究並五苯(pentacene)薄膜結構系統,探討影響電光性質的機制。反射光譜經由電場調制之後,所獲得的調制譜圖有微分結構。藉由吸收譜圖和電場調制光譜的比較,我們可以得到並五苯的四個躍遷能量:1.85eV、1.97eV、2.12eV、2.28eV。藉由史達克效應(Stark effect)理論,我們可以建立微分結構模型來分析譜圖,微分結構模型所擬合的譜形和實驗譜形兩者形狀一樣。在電場調制光譜實驗中,我們分別改變調制電壓和直流偏壓,實驗結果符合史達克效應理論的預測,這表示並五苯樣品在外加電場的情況下,發生史達克效應,是史達克效應主導電場調制光譜的譜形結構。改變並五苯所處的環境溫度,將溫度從25K開始逐漸升高溫度時,調制光譜的光譜強度會隨著溫度升高而逐漸增加。當溫度逐漸接近250K時達到最大值,繼續增加溫度到300K,光譜強度反而變弱。

    目 錄 第一章 有機半導體簡介...............................1 第二章 光譜原理....................................4 2-1 有機半導體的躍遷機制............................4 2-2 電子躍遷理論...................................9 2-3 物質的光學常數................................14 2-4 電場調制光譜的基本原理.........................19 2-5 史達克效應....................................24 2-5.1 線性史達克效應..............................26 2-5.2 二次史達克效應..............................28 2-5.3 史達克效應在電場調制光譜上的應用..............32 第三章 實驗方法...................................35 3-1 並五苯的簡介..................................35 3-2 電場調制光譜的實驗原理.........................38 3-2.1 透射.......................................38 3-2.2 反射.......................................41 3-2.3 實際測量...................................42 3-2.4 三明治結構和共平面結構.......................47 3-3 各種內部電場分布下的電場調制光譜訊號.............51 3-3.1 均勻分布...................................52 3-3.2 類蕭特基二極體分布..........................54 3-3.3 空間電荷侷限分布............................56 3-4 鎖相放大器的運作原理...........................59 3-5 樣品結構.....................................65 3-6 實驗裝置.....................................67 第四章 實驗結果與分析..............................71 4-1 並五苯薄膜系統的內部電場分布....................72 4-2 吸收光譜與電場調制光譜.........................74 4-3 調制電壓對電場調制光譜的譜峰位置和強度之影響......85 4-4 直流偏壓對電場調制光譜的譜峰位置與強度之影響......91 4-5 溫度對電場調制光譜的的譜峰位置與強度之影響........95 第五章 結論與展望.................................100 參考文獻.........................................102

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