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研究生: 李振岳
Zhen Yue Li
論文名稱: 以Pt(O)製作下電極對PZT鐵電薄膜特性之影響研究
指導教授: 吳泰伯
T.B.Wu
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: 2001
畢業學年度: 89
語文別: 中文
論文頁數: 131
中文關鍵詞: Pt(O)PZTPtFerroelectriclow-voltage
外文關鍵詞: Pt(O), PZT, Pt, Ferroelectric, low-voltage
相關次數: 點閱:3下載:0
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  • 本實驗是探討把PZT薄膜濺鍍在不同的白金底電極及白金氧底電極上,在經過不同條件的結晶熱處理後,探討不同底電極對PZT薄膜的結晶行為及漏電流、鐵電特性、疲勞之影響探討。
    從實驗結果得知,PZT薄膜濺鍍在經過400℃、30分鐘真空熱處理後的白金氧底電極上面,不管鍍製白金氧底電極的氬氧比比例為何,皆有在外加小電壓的情況下便能反轉鐵電電域而得到形狀完整的電滯曲線。此現象發生的可能的原因為,白金氧底電極為多孔性結構,而孔洞使得PZT薄膜變為不連續,會造成PZT薄膜上的應力釋放(stress relief)的效果,使得當施加小電壓於PZT薄膜時,便能夠反轉鐵電電域,而有電滯曲線的出現。在含氧量較高(Ar/O2=70/30)的白金氧底電極,其殘留極化量較大。在漏電流方面,以高含氧量的白金氧底電極其崩潰電場較大。在介電特性方面,在低含氧量的白金氧底電極上的PZT薄膜,其相對介電常數約為460~540之間;在高含氧量的白金氧底電極上的PZT薄膜,其相對介電常數約為320~510之間。而在反轉電壓為正負3V及量測電壓亦為3V的疲勞測試中,Pt/PZT/Pt(O)電容結構在經過109次疲勞測試後,其可反轉的殘留極化量還有未測試前的75%。


    目 錄 摘要 誌謝 表目錄 圖目錄 第一章 緒論…………………………………………………...1 第二章 文獻回顧……………………………………………...5 2-1 鐵電性質…………………………………………………………5 2-1-1 極化機制………………………………………………….5 2-1-2 介電常數與介電損失…………………………………….6 2-1-3 介電崩潰………………………………………………….7 2-1-4 鐵電特性………………………………………………….8 2-2 鐵電記憶元件…………………………...……………………...10 2-2-1 鐵電記憶體的設計原理………………………………...11 2-2-2 電滯曲線量測原理……………………………………...12 2-3 鋯鈦酸鉛晶體的結構與性質………………………………......13 2-4 鐵電材料的電性探討………………………………...………...14 2-4-1 漏電流機制……………………………………………...14 2-4-1-1 能障限制…………………………..…………..14 2-4-1-2 本體限制……………...……………………….15 2-4-2 依時介電崩潰…………………………………………...16 2-4-3 鐵電記憶體之疲勞特性………………………………...17 2-4-4 時效……………………………………………………...19 2-5 電極材料對鐵電薄膜性質的影響………………………...…...19 2-5-1 貴重金屬電極…………………………………………...20 2-5-2 氧化物電極……………………………………………...21 2-6 濺鍍原理………………………………………………………..21 2-6-1 直流濺鍍法……………………………………………...23 2-6-2 射頻濺鍍法……………………………………………...23 2-6-3 磁控濺鍍法……..………………..…………….………..24 第三章 實驗程序…………………………………………….38 3-1 把PZT薄膜鍍製在白金(Pt)電極上…………………...….……38 3-1-1 基板的準備……………………………………………...38 3-1-2 底電極的製備………………………...…………….…...38 3-2 把PZT薄膜鍍製在白金氧Pt(O)電極上………………………39 3-2-1 基板的準備……………………………………………...39 3-2-2 底電極的製備…………………………………………...39 3-2-3 白金氧(Pt(O))底電極的物性量測…………………...…39 3-3 以射頻磁控濺鍍Pb(Zr,Ti)O3(PZT)薄膜…………………….....39 3-3-1 PZT的靶材………………………...…………………….39 3-3-2室溫濺鍍PZT薄膜之沈積步驟…………………………40 3-4 PZT薄膜之物性量測……………………………………………40 3-5 PZT薄膜之電性量測……………………………………………41 3-5-1 上電極之製作…………………………………………….41 3-5-2 電性量測………………………………………………….41第四章 實驗結果與討論……….……………………………49 4-1 鍍製在白金(Pt)底電極上PZT薄膜的特性探討………………49 4-1-1 物理性質………………………………………………...49 4-1-1-1 膜厚與剖面微結構……………………………49 4-1-1-2 結晶結構………………………………………49 4-1-1-3 表面微觀結構…………………………………50 4-1-1-4 成份定量分析…………………………………51 4-1-2 電氣特性………………………………………………...51 4-1-2-1 P-E特性………………………………………..51 4-1-2-2 J-E特性………………………...……………...54 4-1-2-3介電特性……………………………………….55 4-2 在氧氣氛下所鍍製的白金氧(Pt(O))底電……………………...56 4-2-1 物理性質………………………………………………...56 4-2-1-1 膜厚與剖面微觀結構…………………………56 4-2-1-2 表面微觀結構…………………………………56 4-2-1-3 結晶結構………………………………………57 4-2-1-4 粗糙度量測……………………………………58 4-3 鍍製在白金氧(Pt(O))底電極上PZT薄膜的特性探討………...59 4-3-1 物理性質………………………………………………...59 4-3-1-1 膜厚與剖面微觀結構…………………………59 4-3-1-2 結晶結構……….………...……………………60 4-3-1-3 表面微觀結構…………………………………60 4-3-2 電氣特性………………………………………………...61 4-3-2-1 P-E特性………………………………………..61 4-3-2-2 J-E特性………………………………………...65 4-3-2-3介電特性……………………………………….65 4-3-2-4疲勞特性……………………………………….66 第五章 結論…………………………….…………………..123 參考文獻……………………………….……………………125

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