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| ???org.dspace.app.webui.jsptag.ItemTag.dcfield??? | Value | Language |
|---|---|---|
| dc.contributor.advisor | 陳永芳(Yang-Fang Chen) | |
| dc.contributor.author | Yu-Hsuan Nian | en |
| dc.contributor.author | 粘育瑄 | zh_TW |
| dc.date.accessioned | 2021-06-17T07:03:10Z | - |
| dc.date.available | 2019-07-31 | |
| dc.date.copyright | 2019-07-31 | |
| dc.date.issued | 2019 | |
| dc.date.submitted | 2019-07-29 | |
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| dc.identifier.uri | http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/72667 | - |
| dc.description.abstract | 隨著對高空間解析度分析材料結構需求增加，掃描穿透式電子顯微鏡(Scanning transmission electron microscope, STEM)為不可或缺的重要研究工具。利用掃描穿透式電子顯微鏡結合電子損失能譜(Electron energy-loss spectroscopy, EELS)，可以同時得到材料的電子結構與原子級影像。
在本研究中，我們應用掃描穿透式電子顯微鏡結合電子損失能譜研究La0.7Sr0.3MnO3(10u.c.)/SrTiO3與La0.7Sr0.3MnO3(5u.c.)/SrTiO3，在室溫下分別為金屬性與絕緣性。原子級尺度的電子結構分析顯示二維電子存在於La0.7Sr0.3MnO3(10u.c.)/SrTiO3。然而，La0.7Sr0.3MnO3(5u.c.)/SrTiO3沒有電荷累積於介面上。此外，我們也討論La0.7Sr0.3MnO3/SrTiO3結構的特性與蕭基特位能障(Schottky barrier ) La0.7Sr0.3MnO3(10u.c.)/SrTiO3之間的關聯性。 | zh_TW |
| dc.description.abstract | With the increasing demand in structural and electronic characterizations at high spatial resolution, atomically-resolved scanning transmission electron microscope (STEM) has become an indispensable tool in modern materials research. When used in combination with electron energy-loss spectroscopy (EELS) that reflects the electronic features of unoccupied density of states, a simultaneous tackling of the structural and electronic characters at atomic resolution had been proven possible and this conjunct STEM-EELS technique is most suitable for addressing the physics at a reduced dimension. In this thesis, we apply the STEM-EELS to the heterostructural system of La0.7Sr0.3MnO3/SrTiO3 with the La0.7Sr0.3MnO3 thickness of 5 and 10 unit cells, respectively. Notably, the 5 (10) unit-cell La0.7Sr0.3MnO3 film is insulating (conductive) at room temperature, whereas the corresponding bulk is characteristically metallic. The atomic-scale electronic characterization revealed the existence of a two-dimension electron density in the conductive 10-unit-cell La0.7Sr0.3MnO3/SrTiO3. In comparison, the 5-unit-cell counterpart displays a missing charge density as expected for an insulating interface. The profound structure-property interplay in the heterostructures were discussed and the reported Schottky barrier in a metallic La0.7Sr0.3MnO3/SrTiO3 heterostructure was also tackled. | en |
| dc.description.provenance | Made available in DSpace on 2021-06-17T07:03:10Z (GMT). No. of bitstreams: 1 ntu-108-R06245003-1.pdf: 4775902 bytes, checksum: d4bc6b5b5ef86511726df248418f36d4 (MD5) Previous issue date: 2019 | en |
| dc.description.tableofcontents | 目錄 3
圖目錄 5 表目錄 9 摘要 10 Abstract 11 第一章簡介 13 1.1 前言 13 1.2 研究動機 14 第二章 材料介紹 18 2.1 晶體結構 18 2.2 電子結構 18 2.3 鑭鍶錳氧的相圖 20 第三章 實驗原理 22 3.1 電子和樣品的交互作用-電子散射 22 3.2 形變(Strain) 23 3.3 擴散作用(Interdiifusion) 23 3.4 X光繞射原理 24 第四章 實驗技術介紹 28 4.1 STEM影像 28 4.2 STEM-EELS介紹 30 4.3 X光粉末繞射 34 第五章 實驗數據分析與討論 35 5.1電性量測 36 5.2 ADF影像分析 37 5.3原子位移分析 41 5.4 STEM-EELS分析 46 第六章 結論 58 參考文獻 59 | |
| dc.language.iso | zh-TW | |
| dc.subject | 掃描穿透式電子顯微鏡 | zh_TW |
| dc.subject | 蕭基特位能障 | zh_TW |
| dc.subject | 氧化物異質介面 | zh_TW |
| dc.subject | 電子能量損失能譜 | zh_TW |
| dc.subject | 鑭鍶錳氧 | zh_TW |
| dc.subject | Schottky barrier | en |
| dc.subject | scanning transmission electron microscopy | en |
| dc.subject | La0.7Sr0.3MnO3 | en |
| dc.subject | oxide heterointerface | en |
| dc.subject | electron energy-loss spectroscopy | en |
| dc.title | "利用掃描穿透式電子顯微鏡結合電子能量損失能(La,Sr)MnO3/SrTiO3氧化物異質介面之研究" | zh_TW |
| dc.title | Study of (La,Sr)MnO3/SrTiO3 Oxide Interfaces by Scanning Transmission Electron Microscopy Combined with Electron Energy-Loss Spectroscopy | en |
| dc.type | Thesis | |
| dc.date.schoolyear | 107-2 | |
| dc.description.degree | 碩士 | |
| dc.contributor.coadvisor | 朱明文(Ming-Wen Chu) | |
| dc.contributor.oralexamcommittee | 朱英豪(Ying-Hao Chu),郭光宇(Guang-Yu Guo) | |
| dc.subject.keyword | 掃描穿透式電子顯微鏡,電子能量損失能譜,氧化物異質介面,鑭鍶錳氧,蕭基特位能障, | zh_TW |
| dc.subject.keyword | scanning transmission electron microscopy,electron energy-loss spectroscopy,oxide heterointerface,La0.7Sr0.3MnO3,Schottky barrier, | en |
| dc.relation.page | 61 | |
| dc.identifier.doi | 10.6342/NTU201902115 | |
| dc.rights.note | 有償授權 | |
| dc.date.accepted | 2019-07-30 | |
| dc.contributor.author-college | 理學院 | zh_TW |
| dc.contributor.author-dept | 應用物理研究所 | zh_TW |
| Appears in Collections: | 應用物理研究所 | |
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|---|---|---|---|
| ntu-108-1.pdf Restricted Access | 4.66 MB | Adobe PDF |
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