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研究生: 郭政傑
Kuo, Cheng-chieh
論文名稱: 以熱蒸鍍法成長氧化鋅之螢光光譜研究
Photoluminescence studies on ZnO grown by thermal evaporation
指導教授: 田興龍
Tien, Shien-Long
學位類別: 碩士
Master
系所名稱: 理學院 - 光電科學與工程研究所
Institute of Electro-Optical Science and Engineering
論文出版年: 2007
畢業學年度: 95
語文別: 中文
論文頁數: 47
中文關鍵詞: 螢光光譜氧化鋅熱蒸鍍
外文關鍵詞: ZnO, evaporation, photoluminescence
相關次數: 點閱:61下載:3
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  • 本實驗採取熱蒸鍍法在不同的蒸發源到基板距離(3cm~8cm)將氧化鋅樣品成長在矽基板及玻璃基板,將所有剛成長好的樣品分別在固定溫度600℃、通入氧氣及氬氣環境下加熱,利用5公分距離成長在矽基板上的樣品做相同氧壓力不同氧化溫度(450℃~800℃)及相同600℃氧化溫度不同氧壓力(2Torr~760Torr)處理,並利用掃描式電子顯微鏡(scanning electron microscope)觀察所成長的氧化鋅結構的變化。以光激發螢光(photoluminescence,PL)實驗分析隨著氧化鋅結構的變化,PL光譜訊號紫外光UV部分與可見綠光GR部份之間的改變。
    由本實驗發現基板表面較粗糙可沉積較多的氧化鋅,而剛成長好的樣品為ZnOx(x<1)沉積在基板上形成非晶質的結構,並無PL光譜訊號。沉積在矽基板樣品經相同條件下氧化處理,以5公分距離成長可得較均勻的奈米桿狀結構(nanorod),UV/GR值最大表示有最佳品質。以不同距離成長的樣品在600℃氬氣環境下退火處理並無奈米結構出現,只有可見綠光GR部份的PL光譜訊號。
    接著以5公分距離成長的樣品做不同溫度與壓力的氧化處理,發現在600℃為最佳氧化溫度,在370Torr氧壓力時有較均勻的奈米結構成長。最後將以氧化後的樣品再做退火處理,發現紫外光UV部分訊號可被消除,並在原本結構頂端成長出奈米線,其真正的原因將有待研究。

    In this study, thermal evaporation method was used to fabricate ZnO nanostructure on Si and glass substrate for different growth distances (3~8cm) at different temperature (450℃~800℃) or/and different oxygen pressure (2~760Torr). The variation of structure were measured by scanning electron microcopy (SEM) and the optical properties were examined by photoluminescence (PL) spectra.
    The as-grown sample shows insignificant PL signal due to the amorphous ZnO which developed from ZnOx (x<1). For the samples grown at different growth distance but the same oxidization processes (600℃,1atm oxygen pressure), we find the Zn/Si sample with 5 cm growth height shows uniform nanorod structure in the SEM image and the ratio of ultra violate (UV) PL intensity and green region (GR) PL intensity (UV/GR) is maximum, indicating the best quality. After samples grown at different growth distance were annealed argon environment at 600℃,the samples do not show nanorod image and only GR peak in PL spectrum.
    From the SEM and PL measurement we find that 600℃ is the optimum oxidation temperature and the ZnO nanostructure arises as the growth oxygen pressure is 370 Torr. Re-annealing the oxidized sample under argon gas, the UV PL signal disappears.

    摘 要 I 誌 謝 III 目 錄 IV 圖 目 錄 V 第一章 簡介 1 第二章 原理 5 2-1.以熱蒸鍍法成長氧化鋅的成長機制 5 2-2.光激發螢光之原理 6 2-3.SEM原理、儀器介紹與實驗流程 7 2-4.EDS原理簡介 11 第三章 實驗流程 13 3-1.熱蒸鍍系統與成長過程 13 3-2.退火系統與過程 15 3-3.光激發螢光系統架設、儀器介紹 17 第四章 實驗結果與討論 18 4-1.基板與蒸發源距離不同時成長樣品在相同溫度下氧化及退火其PL的差異 18 4-2.不同氧化溫度對氧化鋅成長的影響 26 4-3.不同氧化壓力下對氧化鋅成長的影響 28 4-3.氧化鋅成長機制 30 第五章 結論 41 參考文獻 42

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