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研究生: 姚富淵
論文名稱: 應用於高介電閘極氧化層之Y1-XAlXO3(X=0∼0.58)薄膜特性探討
指導教授: 甘炯耀
口試委員:
學位類別: 碩士
Master
系所名稱: 工學院 - 材料科學工程學系
Materials Science and Engineering
論文出版年: 2005
畢業學年度: 93
語文別: 中文
中文關鍵詞: 高介電閘極氧化層鋁酸釔非晶氧化鋁氧化釔界面層
外文關鍵詞: Al2O3, Y2O3, amorphrous, dielectric, gate, oxide
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  • Y2O3乃是高介電材料中備受矚目的材料之一,其擁有高介電常數(K=15~18),高ΔEC(2~3Ev),界面熱穩定性佳,低漏電流等優點,但薄膜本身結晶溫度不夠高,在高溫退火後無法維持非晶質結構,故不利於製作非晶質薄膜,然而高介電非晶薄膜應用於閘極氧化層的研究中,鋁酸鹽(MxAl1-xOy)乃是最受矚目的研究方向之一,如: Zr1-xAlxOy、Hf1-xAlxOy,其研究結果顯示可擁有不錯的介電常數,且在一般二元材料中添加Al2O3,可提升其結晶溫度,並有助於抑制漏電流發生,因此本研究方向乃是選擇為(Y2O3)1-x(Al2O3)x作為研究對象,探討添加Al2O3的含量對薄膜結晶溫度與電性方面的影響.
     本實驗乃採用射頻磁控濺鍍法在p-Si(100)基板上鍍覆Y1-xAlxO3 (x=0~0.58)薄膜,其主要探討的重點主要分為四個部分:一.薄膜退火前後之結晶狀態分析與討論.二.薄膜之表面形貌分析與討論.三.閘極電容退火前後之介電特性分析與討論.四.閘極電容退火前後之漏電流特性分析與討論.
    實驗結果發現增加薄膜中Al的含量有助於提升薄膜結晶溫度,並且可藉由抑制結晶薄膜之結晶化程度,降低其薄膜表面粗糙度,在電性方面之表現,結果顯示增加薄膜中Al的含量將造成介電常數呈現下降趨勢,並有助於抑制漏電流的發生,當Al含量為23%時,在875℃下、退火10min仍可以維持非晶質結構,膜厚250nm之薄膜其介電常數為11.49,且由於界面層電容串聯效應,膜厚10nm之薄膜其介電常數僅5.3,在E=1MV/cm時,其漏電流密度為3.42×10-8 A/cm2.薄膜經過高溫熱退火後,可改善其C-V遲滯現象,並且隨著退火溫度的提升其平帶電壓呈增加趨勢,且造成薄膜之整體單位面積電容值下降,此乃因為界面層增加造成之影響,故隨退火溫度上升其漏電流密度呈現下降趨勢。


    第一章 緒論 1 1.1 研究背景…………..........……………………………….................1 1.2 研究動機………………..........………………………….................4 參考文獻........................................................................................5 第二章 文獻回顧 7 2.1高介電材料之介電機制介紹…..…….………….......….…….…....7 2.1.1電子位移極化………………….….………….………………7 2.1.2離子位移極化…………………….…………......…….............7 2.1.3偶極極化………………………...……………..…………..….7 2.1.4空間電荷極化…………………..….…………………….……8 2.2閘極電容之電容電壓特性……….....……………..………………..8 2.3補陷電荷對閘極電容C-V量測之影響……....………...……..……9 2.3.1可移動的游離電荷Qm…………………..…..……..…….…...10 2.3.2氧化層捕獲電荷 Qot……………………..……....…..….…...10 2.3.3氧化層固定電荷 Qf………………….…...……….…….…...11 2.3.4界面捕獲電荷 Qit…………………...……..…..….…….…...12 2.4高介電材料選擇方式…............................................................…...13 2.4.1介電常數與載子界面阻障高度……..............................……13 2.4.2熱穩定性……..................................................................……14 2.5高介電材料之特性表現.................................................................16 2.5.1 Y2O3之特性表現…….......................................................……16 2.5.2鋁酸鹽之特性表現……..................................................……16 2.6退火溫度對薄膜介電特性之影響.................................................18 參考文獻....................................................................................19 圖表............................................................................................29 第三章 實驗流程與方法 46 3.1閘極電容製作方式…..…….………........................….…...…....46 3.1.1靶材製備方式……..…....................................………………46 3.1.2基板處理方式……....…………….…………......……...........47 3.1.3閘極氧化層鍍製方式…………...……………..…......…..….48 3.1.4薄膜上電極鍍製方式………..….…………………….……..48 3.2薄膜特性分析種類.................................…..……..………………49 3.2.1薄膜晶體結構分析…………..…..……..…...............….…...49 3.2.2薄膜厚度量測…………...........................……....…..….…...49 3.2.3薄膜表面粗糙度分析……….…...............……….…….…...49 3.3電性分析種類….......................................................................…...49 3.3.1薄膜介電特性量測…….................................................……49 3.3.2薄膜漏電特性量測…….................................................……50 圖表......................................................................................51 第四章 薄膜退火前後之結晶狀態討論 54 4.1薄膜退火前後之結晶狀態討論…..…….……….……........….....54 4.1.1鍍膜時間對薄膜結晶型態之影響….………….……………54 4.1.2薄膜成分對薄膜結晶狀態之影響..……................................55 4.1.3薄膜成分對退火後薄膜結晶溫度之影響……................….56 4.1.4鍍膜溫度對薄膜結晶溫度之影響………………….….……57 4.2薄膜表面形貌分析與討論…..…….……….……...............….....58 4.2.1成分對非晶薄膜之表面粗糙度影響………….……………58 4.2.2薄膜成分對結晶薄膜結晶狀態之影響..……........................59 4.3閘極電容退火前後之介電特性探討........................................…...60 4.3.1介電特性之遲滯現象(hysterisis)討論..............................60 4.3.2不同厚度Y0.93Al0.07O3之介電常數探討............................……62 4.3.3單位面積界面層電容值探討.................……….……………64 4.3.4不同成分Y1-XAlXO3介電常數探討(膜厚為240~258nm).........65 4.3.5不同成分Y1-XAlXO3介電常數探討(膜厚為9~11nm)...............66 4.3.6薄膜本質介電常數探討…….............................……....….…67 4.3.7上電極與矽基板之功函數差探討….………….……………68 4.3.8不同成分Y1-XAlXO3薄膜之平帶電壓差探討............................69 4.3.9高溫退火對薄膜介電特性之影響……..................................71 4.4閘極電容退火前後之漏電流分析與討論................................…...73 4.4.1不同成分Y1-XAlXO3漏電流密度探討........................................73 4.4.2高溫退火後漏電流密度分析..........................................……74 參考文獻............................................................................................76 圖表............................................................................................78 第五章 結論 98

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