| 研究生: |
張境尹 Chang, Ching-Yin |
|---|---|
| 論文名稱: |
掺雜與製程條件對於氧化鋅薄膜特性之影響及其在氣體感測器之應用 The Effects of Dopants and Deposition Conditions on the Characterization of ZnO Thin Films and Its Applications on Gas Sensors |
| 指導教授: |
朱聖緣
Chu, Shen-yuan |
| 學位類別: |
碩士 Master |
| 系所名稱: |
電機資訊學院 - 電機工程學系 Department of Electrical Engineering |
| 論文出版年: | 2007 |
| 畢業學年度: | 95 |
| 語文別: | 中文 |
| 論文頁數: | 118 |
| 中文關鍵詞: | 薄膜 、感測器 、氧化鋅 |
| 外文關鍵詞: | sensor, thin film, ZnO |
| 相關次數: | 點閱:41 下載:0 |
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本論文主要以射頻磁控濺鍍法,探討氧化鋅薄膜對於有毒氣體一氧化碳(CO)的感測特性。我們首先設計不同的製程參數:控制氬氣與氧氣的比例、濺鍍時間、改變基板溫度及退火處理溫度;接下來以選定之成長條件成長不同錫掺雜量之氧化鋅薄膜。利用X光繞射儀 ( XRD )、掃描式電子顯微鏡 ( SEM )、原子力顯微鏡(AFM)檢測薄膜晶體的結構、表面形態與粗糙度。
將此薄膜應用在以SiN/Si(氮化矽/矽)基板的氣體感測器上,研究改變製程條件及摻雜對氣體感測靈敏度和反應時間的影響。在成長時間為20分鐘、氧氣氛比例為20 %、在不加溫的基板及不退火的情況下,在操作溫度為400oC時 對250ppm的CO其靈敏度為23.27 %,反應時間約為23分鐘。在相同的製程條件下,摻雜錫比例為20 mol%時因為其薄膜表面型態的改變,其靈敏度可達到31.622 % ,反應時間約為18分鐘 。
In this study , Poly-crystal ZnO films have been grown by RF magnetron sputtering technique and were investigated the CO gas sensing properties . First , the deposited films were characterized as a function of argon-oxygen gas flow ratio, deposited time, substrate temperature, and annealing temperature. According to above sputter conditions, deposited the ZnO films with the different Sn content . Crystalline structures, surface morphology of the films were analysed by X-ray diffraction ( XRD ), scanning electron microscopy ( SEM ), atomic force microscopy ( AFM ) measurement.
The resulting films were applied to the gas sensor based on ZnO/SiN/Si structure . The effect of deposition conditions and dopants on the sensitivities and response time were studied. The sensitivity(23.27%) and response time(23 minutes)of pure ZnO thin film were obtained under a sputtering time of 20 minutes , containing 20% oxygen and 80% argon for none treatment .At the same process , the sensitivity of 20mol% Sn doped ZnO films arrive up to 31.622% due to the variation of surface morphology . It`s response time was about 18 minutes .
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