研究生: |
梁春昇 Chun-Sheng Liang |
---|---|
論文名稱: |
含導電性鉛酸鋇薄膜之鐵電電容器之研究 Investigation of Conductive-BaPbO3-Based Ferroelectric Capacitors |
指導教授: |
吳振名
Jenn-Ming Wu |
口試委員: | |
學位類別: |
博士 Doctor |
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: | 英文 |
論文頁數: | 240 |
中文關鍵詞: | 鐵電 、薄膜 、非揮發記憶體 、氧化物電極 、鋯鈦酸鉛 、鉛酸鋇 |
外文關鍵詞: | ferroelectric, thin film, nonvolatile memory, oxide electrode, Pb(Zr,Ti)O3, BaPbO3 |
相關次數: | 點閱:3 下載:0 |
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鉛酸鋇電極由於與鈣鈦礦結構的鐵電材料(如:鋯鈦酸鉛、鈦酸鍶鋇)之結構相同,因此具有提升鐵電材料特性之潛力。此外,由於鉛酸鋇含有鉛,因此與含鉛的鐵電材料結合應用時,可以避免因為在鐵電材料/電極界面形成缺鉛的界面層而產生電性劣化。本論文研究結果顯示,鉛酸鋇電極可以有效的改善電極/鋯鈦酸鉛界面和電極/鈦酸鍶鋇界面,進而提升電性表現。鉛酸鋇本身不具催化氫之特性,且可避免氫造成鐵電層劣化的情形發生,即使在經過400℃的氫氣氛熱處理,特性依舊沒劣化。
(001)、(110)和(111)三種高優選取向的鋯鈦酸鉛薄膜都可經由適當緩衝層的選用,可在鉛酸鋇電極上成功地製作出來。其中,鋯鈦酸鉛/鉛酸鋇/釕(PZT/BPO/Ru)和鋯鈦酸鉛/鉛酸鋇/鉑/釕(PZT/BPO/Pt/ Ru)兩種疊層都適合用於單電晶體單電容(1T1C)的疊層結構,具有應用於高密度鐵電記憶體之潛力。此乃由於兩者具有避免位元與位元間差異過大與防止鉛、氧等元素擴散之能力。除了上述在矽基板上高優選取向的薄膜外,鉛酸鋇和鋯鈦酸鉛的磊晶薄膜在鋁酸鑭和鈦酸鍶基板上也成功地被鍍製出來。利用兩階段的方式,鉛酸鋇與鋯鈦酸鉛薄膜可分別在350℃與475℃鍍出磊晶膜。鋯鈦酸鉛磊晶膜最佳之殘留極化量與矯頑電場分別為35.54μC/cm2與102.67 kV/cm。
The BaPbO3 (BPO) electrode has the potential in improving the performance of perovskite-type ferroelectric materials, such as Pb(Zr,Ti)O3 (PZT) and (Ba,Sr)TiO3 (BST) due to the similarity in crystal structure. Besides, BPO containing Pb benefits the Pb-based ferroelectric films for preventing the formation of Pb-deficient layer near ferroelectric/electrode interface and degradation of electrical properties. In this thesis, it is found that the BPO electrode improves the electrode/PZT and electrode/BST interfaces and results in the enhancement of electrical properties. The catalytically inactive BPO prevents the hydrogen-induced degradation in ferroelectric layer even after 400℃ forming gas annealing.
With the aid of suitable template layers, the highly (001)-, (110)- and (111)-oriented PZT films can be fabricated on BPO. Among them, the PZT/BPO/Ru and PZT/BPO/Pt/Ru stacks have the potential for application in 1T1C stack structures for high density memory. Both stacks can decrease the bit-to-bit variations of polarization and prevent the diffusion of lead and oxygen. In addition to highly-oriented films on Si, the BPO and PZT films can grow epitaxially on LaAlO3 and SrTiO3 substrates at the temperatures as low as 350℃ and 475℃ with the two-step method. Well-saturated hysteresis loops can be obtained with the remanent polarization of 35.54μC/cm2 and coercive field of 102.67 kV/cm.
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