| 研究生: |
王明俊 Wang, Ming-Jun |
|---|---|
| 論文名稱: |
射頻濺鍍法生長鉍鑭鈦薄膜及其鐵電性質研究 Study of Growth Behavior and Ferroelectricity of La-doped Bi4Ti3O12(BLT) Thin Films grown by Radio-Frequency Sputtering |
| 指導教授: |
林文台
Lin, Win-Ti |
| 學位類別: |
碩士 Master |
| 系所名稱: |
工學院 - 材料科學及工程學系 Department of Materials Science and Engineering |
| 論文出版年: | 2002 |
| 畢業學年度: | 90 |
| 語文別: | 中文 |
| 論文頁數: | 123 |
| 中文關鍵詞: | 鐵電性質 、射頻濺鍍法 、BLT薄膜 |
| 外文關鍵詞: | radio-frequency(RF) sputtering, ferroelectricity, BLT thin films |
| 相關次數: | 點閱:141 下載:2 |
| 分享至: |
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中 文 摘 要
本實驗以射頻濺鍍法生長Bi3.2La0.54Ti3OX (BL0.54T)、Bi3.2La0.73Ti3OX (BL0.73T)、Bi3.2La0.91Ti3OX (BL0.91T)三種鐵電薄膜。並探討不同La組成(La = 0.54、0.73、0.91)、不同退火溫度(675℃、700℃、750℃)、不同退火方式(一次退火、二次退火)、不同退火氣氛(空氣、氧氣)對其鐵電性質、漏電流及疲勞現象之影響。BLT鐵電薄膜剛退火其遲滯曲線多少都有不飽和的現象。隨著時間的經過,遲滯曲線逐漸飽和且殘餘極化(Pr)與矯頑電場(Ec)逐漸降至一定值。造成Pr隨時間遞減的機制可能為電荷缺陷擴散至晶格平衡位置、鬆弛效應與電荷缺陷釘住晶域壁使其不易反轉的效應。與空氣中退火相比較,在氧氣中退火會使BLT的結晶性較差,並且於氧氣中退火會促進Bi2Ti2O7順電相生長,因此劣化BLT整體鐵電性質。殘餘極化量(2Pr)隨著La含量的增加會遞減,此係因La添加會減少BTO相之晶格扭曲。在漏電流量測中,在相同電場(200kV/cm)下,BLT漏電流密度為10-5~10-6 A/cm2,比添加W的BLTW(約10-7A/cm2)多1~2個order。BLT薄膜空氣中退火的試片,在較小的電場作用下會有疲勞現象,但在較大的外加電場作用下,則無疲勞的現象。這可能是field-assisted domain unpinning的效應所造成。La含量增加也可以改善BLT薄膜的疲勞性質。又BLT薄膜在空氣中退火比在氧氣中退火有較好的疲勞性質。
Abstract
The room temperature aging behavior , ferroelectricity , fatigue behavior , and leakage current of La-doped Bi4Ti3O12(BLT) thin films with various La concentrations such as Bi3.2La0.54Ti3OX (BL0.54T)、Bi3.2La0.73Ti3OX (BL0.73T)、Bi3.2La0.91Ti3OX (BL0.91T), which were deposited by radio-frequency(RF) sputtering and then annealed at a temperature of 675℃、700℃、750℃ in air and O2, respectively , were studied . Most of the polarization-electric field (P-E) loops of BLT capacitors measured immediately after annealing showed somewhat leaky. Upon aging at room temperature the P-E loops could become saturated and thereafter the remanent polarization (Pr) and coercive field (Ec) decreased slowly with time and approached to a constant value. The mechanisms responsible for the decay of Pr with time may be the diffusion of charged defects to the equilibrium lattice sites, relaxation effect, and the domain pinning effect of charged defects. As compared with annealing in air, annealing in O2 resulted in poor crystallization of BLT films, furthermore, annealing in O2 could enhance the formation of pyrochlore Bi2Ti2O7 and thus degraded the ferroelectricity of the capacitors. The 2Pr decreased with the La concentration because adding La into Bi4Ti3O12 could cause less structure distortion. The leakage current of BLT capacitors is in the order 10-5~10-6 A/cm2 at the field of 200 kV/cm, being at least greater an order of magnitude lower than the W-doped BLT capacitors. The BLT capacitors showed fatigue-free at elevated cycling field, indicating that the fatigue-free behavior of BLT capacitors is due to the field-assisted domain unpinning effect. Increasing the La concentration could improve the fatigue properties of BLT capacitors. The BLT thin films annealed in air showed better fatigue properties than that annealed in O2.
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