| 研究生: |
張耕銘 Chang, Keng-Ming |
|---|---|
| 論文名稱: |
氧化鋅-氧化鉍複層薄膜之微結構與非歐姆性質之研究 The Study of the Microstructures and Non-ohmic Properties of the ZnO-Bi2O3 Multilayer |
| 指導教授: |
劉全璞
Liu, Chuan-Pu |
| 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: | 2004 |
| 畢業學年度: | 92 |
| 語文別: | 中文 |
| 論文頁數: | 109 |
| 中文關鍵詞: | 變阻器 、氧化鋅 |
| 外文關鍵詞: | varistors, ZnO |
| 相關次數: | 點閱:45 下載:3 |
| 分享至: |
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在本實驗中利用射頻磁控濺鍍的方式製作氧化鋅-氧化鉍複層,並探討其非歐姆性質。其結果發現非歐姆性質受其複層中的組成以及微結構所影響,如藉由氧化鉍層之濺鍍氧分壓調整其微結構及組成,可控制氧化鋅-氧化鉍複層之啟動電壓;除此之外亦可透過添加鋁雜質或改變氧化鋅層之濺鍍氧分壓,調整氧化鋅層之載子濃度亦可控制其複層的啟動電壓,本實驗中啟動電壓的變化範圍為26.5V至4.3V。當氧化鋅層載子濃度因添加鋁雜質而提高時,會降低其氧化鋅-氧化鉍複層之非線性係數以及增加漏電流,此現象可藉由於氧化鋅-氧化鉍界面處加入一層ZnO:Co層改善,本實驗中獲得最高之非線性係數為44.15。
The thin film varistors of ZnO-Bi2O3 multilayer junctions were fabricated by RF sputtering. The nonlinear I-V characteristics and nonlinear coefficient, α, under reverse bias were found to be effected by the composition and structure of the varistor multilayers. The threshold voltage is predominantly determined by the microstructure and thickness of the Bi2O3 layer in thin film varistors, while that can be tuned by altering the donor density in ZnO, which was achieved by varying Al doping concentration or sputtering conditions. The threshold voltages of the device can be adjusted from 26.5V to 4.3V. The higher leakage current and lower nonlinear coefficient associated with the ZnO layer doped with Al (ZnO:Al) can be improved by inserting another ZnO layer doped with selective transition metal impurities between ZnO:Al and Bi2O3 layers. The highest nonlinear coefficient in this thesis is 44.15. The microstructure and defects of the multilayers were investigated in detail and related to the performance of the electrical properties.
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