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 |
相關次數: | 點閱:1 下載:0 |
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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。
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