博碩士論文 103226069 詳細資訊




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姓名 李克辰(Ko-Chen Li)  查詢紙本館藏   畢業系所 光電科學與工程學系
論文名稱 氧化鋅的熱分解對矽基板上氮化鎵奈米異質磊晶的影響
(The effect of ZnO thermal decomposition on the nanoheteroepitaxy of GaN on Si)
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摘要(中) 本研究探討論氧化鋅奈米柱在高溫、含氫環境下的穩定性。氧化鋅奈米柱可作為氮化鎵在矽基板上的磊晶緩衝層,能有效減緩氮化鎵與矽基板之間的晶格應力,且奈米柱可用低溫、大面積的水熱法生長而成。此外,氧化鋅奈米柱的鋅在高溫製程時會擴散至氮化鎵,產生氮化鎵的鋅摻雜,形成p型氮化鎵,我們希望以此p-side-down的LED結構,來提升量子井的發光效率。
然而,在有機金屬化學氣相的磊晶過程中,基板溫度通常超過1000 oC,且需要含氫氣的環境,這些條件會對氧化鋅產生蝕刻的作用,影響氧化鋅的晶格結構,因此氧化鋅的穩定性對氮化鎵的品質有關鍵性的影響。本研究使用快速熱退火爐管,觀察氧化鋅在高溫、不同氫含量下(空氣、真空及氮氣)的反應,希望能藉此了解氧化鋅奈米柱在氮化鎵磊晶過程中的結構變化。
根據SEM及XRD的觀察,在空氣中的氧化鋅奈米柱的耐熱程度最低,在900 oC時就會產生形變,且與相鄰的奈米柱接合,無法保持住本身奈米柱的型態,當溫度到達1000 oC時,奈米柱即完全塌陷;真空環境下的氧化鋅奈米柱則是在900 oC時產生些微的形變,但還能保持奈米柱的原始型態;氮氣環境下的氧化鋅奈米柱在1000 oC時才開始發生形變。這樣的實驗結果可以確認氧化鋅奈米柱在高溫下的不穩定性,除了氧化鋅的熱分解,在含有氫氣的環境下,還會有氫氣蝕刻的影響,造成氧化鋅奈米柱的耐熱程度更低。
摘要(英) In this study, we investigated the stability of ZnO nanorods at high temperature and hydrogen environments. ZnO nanorods are employed as the buffer structure for the growth of GaN on silicon substrates via metal-organic chemical vapor deposition (MOCVD). The nanorods can be attained with a hydrothermal synthesis, which is a low-temperature and wafer-scale process. GaN grown on ZnO is inherently p-type, which is due to the diffusion of Zn ions. For LEDs, the inherent p-type GaN can benefit the internal quantum efficiency by forming the p-side-down structure, which reverses the polarization-induced field and increases carrier injection efficiency.
However, during MOCVD growth, the substrate temperature usually exceeds 1000 oC, and a hydrogen-containing atmosphere is required, and these conditions can lead to thermal decomposition and H2 back-etching of ZnO nanorods, sacrificing the crystal qualities of GaN-on-Si. To understand the etching and decomposition process, rapid thermal annealing (RTA) with different hydrogen contents (air, vacuum, and nitrogen) was used to treat ZnO nanorods.
According to the observations with scanning electron microscopy and X-ray diffraction, it is found that the ZnO nanorods in air start to deform and decompose at 900 oC, and completely collapse at 1000 o C. In the vacuum environment, the nanorods slightly deform at 900 oC, but the original “rod” shape can be maintained. The ZnO nanorods are most durable in nitrogen, and the geometry is well maintained until the temperature reaches 1000 oC. These results confirm that, in addition to thermal decomposition, ZnO nanorods suffer H2 back-etching in the presence of high-temperature hydrogen, which should be closely cared during the growth of GaN-on-Si. ?
關鍵字(中) ★ 氮化鎵
★ 氧化鋅
★ 奈米異質磊晶術
★ 熱分解
關鍵字(英) ★ GaN
★ ZnO
★ nanoheteroepitaxy
★ GaN on Si
論文目次 目錄
論 文 摘 要 i

ABSTRACT ii

誌謝 iv

目錄 v

圖目錄 vii

表目錄 x

英文名詞縮寫對照表 xi

第一章、簡介 - 1 -

1.1 發光二極體(LED)基本介紹 - 1 -

1.2研究動機 - 6 -

1.2.1 LED的效率瓶頸 - 6 -

1.2.2 矽基板與p-side-down 結構的優勢 - 7 -

1.2.3 氧化鋅奈米異質磊晶術與其技術障礙 - 11 -

1.3章節架構 - 16 -



第二章、儀器介紹與試片製程分析 - 17 -

2.1 p-side-down LED的效率模擬設定 - 17 -

2.2實驗流程 - 20 -

2.2.1氧化鋅奈米柱的製備. - 21 -

2.2.2氧化鋅奈米柱在高溫下的影響 - 26 -

第三章、結構分析與討論 - 30 -

3.1退火溫度與時間對氧化鋅奈米柱之影響 - 30 -

3.2氧化鋅奈米柱經過快速熱退火之影響 - 40 -

3.2.1掃描式電子顯微鏡(SEM)之分析 - 41–

3.2.2 X光繞射(XRD)之分析 - 48 -

3.3 有機金屬化學氣相沉積法(MOCVD) 成長磊晶層 - 50 -

第四章、結論與未來發展 - 54 -

4.1 結論 - 54 -

4.2 未來發展 - 55 -

參考文獻 - 57 -
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指導教授 賴昆佑(Kun-Yu Lai) 審核日期 2017-3-17
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