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研究生: 羅子涵
Lo, Zih-Han
論文名稱: 高介電常數有機/無機複合絕緣層氧化鋅薄膜電晶體製作與研究
Fabrication of ZnO Thin Film Transistor with High-k Organic-Inorganic Composite Dielectric
指導教授: 李文熙
Lee, Wen-Shi
學位類別: 碩士
Master
系所名稱: 電機資訊學院 - 電機工程學系
Department of Electrical Engineering
論文出版年: 2007
畢業學年度: 95
語文別: 中文
論文頁數: 90
中文關鍵詞: 薄膜電晶體氧化鋅
外文關鍵詞: ZnO, TFT
相關次數: 點閱:62下載:4
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  • 本論文用Poly(4-vinylphenol)以添加分散劑的方法,把奈米級氧化鈦(TiO2)加在PVP裡面,製成有機-無機混合複合絕緣層薄膜。此複合絕緣層薄膜成功把未添加奈米粉體的PVP從K值3.5提高到3.9,提升幅度達11%,並且還能保持10-9次方漏電流密度,擁有極佳的絕緣特性同時具有無機性(抗震、耐拉)與有機性(可塑、透明、可撓)的特性。
    並利用氧化鋅薄膜應用於元件通道層,氧化鋅薄膜採用射頻濺鍍法成長,針對氧氣與氬氣比例、濺度功率、退火處理溫度等參數做調變。並做晶體結構、表面形態及電性量測等等分析,來決定何種氧化鋅薄膜條件有利於TFT元件製作。
    本TFT為上閘極結構,氧化鋅薄膜在濺鍍功率300W、氧氣氛濃度10%,退火溫度250℃情況下,複合絕緣層添加TiO2粉體濃度為0.6 VOL%,製作出空乏型TFT元件。開關比(on/off ratio)約為4.63*105、載子移動率為0.43cm2/V.S,臨限電壓為-3.7V。

    This study implemented using the method of the dispersing agent with Poly(4-vinylphenol) to generate organic-inorganic thin film insulator layer. Through the adding TiO2 into organic-inorganic thin film insulator layer, the k value increased from 3.5 to 3.9. Furthermore, this insulator layer hold the current density of 10-9 with the extremely characteristic of isolation such as shockproof, and bears pulls and the characteristic of organic along with plastic, transparent and flexible.
    Applies the zinc oxide thin film in the thin film transistor channel layer . The zinc oxide thin film uses the RF sputter to growth . In view of parameters on oxygen and argon proportion, RF power, annealing treatment temperature makes the accent changes .Makes crystalline structure, surface morphology and electrical characteristic and so on analyzes, decided that what kind of zinc oxide thin film condition is advantageous to the TFT device manufacture.
    This TFT was considered as top gate electrode model, which consisted of the zinc oxide thin film in RF power 300W, the oxygen density of 10%, the annealing temperature under 250℃. This TFT model generated the depletion TFT device. The ratio of switch on/off ratio is approximately 4.32*105, and carries mobility is 0.43 cm2/V.S, threshould voltage is -3.7V.

    中文摘要 Ⅰ 英文摘要  Ⅱ 誌謝 Ⅳ 總目錄 Ⅴ 表目錄 Ⅶ 圖目錄 Ⅷ 第一章 序論      1 1-1研究背景與動機      1 1-2 氧化鋅特性介紹      3 1-3 有機無機混合材料    4 1-4 論文簡介      5 第二章 理論基礎      7 2-1 薄膜電晶體工作原理  7 2-1-1 場效電晶體理論  7 2-1-2 薄膜電晶體公式及參數  13 2-2 電漿-濺射理論       16 2-2-1 電漿理論       16 2-2-2 濺射       19 2-3 電容介電原理       22 2-3-1 介電原理       25 2-3-2 相對介電常數(Relative permittivity,εr) 25 2-4 奈米粉體分散理論   25 2-4-1 超音波分散        26 2-4-2 機械分散法        26 2-4-3 化學分散奈米粉體    27 第三章 實驗部分         28 3-1 實驗步驟         28 3-1-1 基板清洗         28 3-1-2 絕緣層製作         28 3-1-3 氧化鋅薄膜製作    30 3-2-4 TFT製作         32 3-2 實驗材料及濺鍍設備    36 3-2-1 濺鍍設備         36 3-2-2 基材         37 3-2-3 靶材         37 3-2-4 濺鍍用氣體         37 3-2-5 有機混無機材料    37 3-3分析儀器         39 3-3-1膜厚分析儀器         39 3-3-2 微結構分析         40 3-3-3 表面形態分析         43 3-3-4 光學性質分析 43 3-3-5 電性量測         44 第四章 結果與討論         46 4-1氧化鋅薄膜分析         46 4-1-1 基板平整性對氧化鋅薄膜影響 46 4-1-2 濺鍍功率對不同氧氣氛影響 48 4-1-3氧化鋅薄膜退火影響     62 4-1-4 總結         66 4-2 複合絕緣層薄膜特性分析     68 4-2-1 分散沉降實驗結果     68 4-2-2 轉速及濃度對應膜厚分析 73 4-2-3 複合絕緣層表面及SEM分析 74 4-2-4複合絕緣層電性分析      79 4-3 元件電性          81 第五章 結論          86

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