| 研究生: |
湯淵富 |
|---|---|
| 論文名稱: |
鐵電薄膜鋯鈦酸鉛(40/60)摻雜Co離子之鐵電性質研究 |
| 指導教授: |
甘炯耀
Jon-Yiew Gan |
| 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: | 2002 |
| 畢業學年度: | 90 |
| 語文別: | 中文 |
| 中文關鍵詞: | 鐵電薄膜 、鋯鈦酸鉛 、疲勞 、漏電流 、介電常數 |
| 外文關鍵詞: | PZT, Co, LCO, dielectric constant |
| 相關次數: | 點閱:181 下載:0 |
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PZT薄膜與CMOS整合較容易,製程溫度較低,較高的殘留極化(Pr),但PZT薄膜仍有許多問題尚待解決,如漏電流、疲勞(fatigue)等特性,其中以疲勞最受重視,因為多次的讀寫次數是必要的,若無法克服疲勞性質,實用性將大大的降低。
本論文採用溶凝膠法旋鍍製作LaCoO3 (LCO)氧化物電極,期望在單獨只有La,Co離子之效果,而無傳統La1-xSrxCoO3(LSCO)氧化物電極之Sr離子情形下,亦可達到疲勞改善之效果,並與PZT中摻雜Co離子(PZTC)做疲勞性質之比較。而疲勞發生的原因可分為鐵電材料本身及鐵電/電極接面兩個因素,所以設計兩種薄膜結構:Pt/PZTC/Pt與Pt/PZTC/PZT/PZTC/Pt,分別探討對鐵電性質之影響。
Pt/PZT/LCO/Pt之疲勞性質,因氧化物電極之加入,明顯可改善傳統Pt/PZT/Pt抗疲勞性質差之缺點,而鐵電性質之Pr值變小,Ec(Vc)值變大,結晶指向由(111)轉變成(100)(200),漏電流變大,介電常數變小。
Pt/PZTC/Pt隨著摻雜Co離子之增加,Ps與Pr變小,Vc(Ec)變大,漏電流變大,介電常數變小,散逸因子變大,疲勞性質以摻雜5%Co為最佳,而9%Co則因漏電流大而造成疲勞性質不佳。結晶指向皆為(111),與摻雜Co量無關,主要與熱處理條件有關連。晶粒變得較純PZT為小,而彼此之差異不大。
Pt/PZTC/PZT/PZTC/Pt隨著摻雜Co離子增加,疲勞性質改善越明顯,以摻雜9%Co最佳,與Pt/PZT/LCO/Pt之疲勞性質接近。隨著摻雜Co離子之增加,Ps與Pr變小,Vc(Ec)變大,介電常數變小,散逸因子變大,漏電流以9%Co為最大。結晶指向皆為(111),與摻雜Co量無關,主要與熱處理條件有關連。晶粒變得較純PZT為小,而彼此之差異不大。
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