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研究生:王超
研究生(外文):Chao Wang
論文名稱:基於金屬-介電質-金屬架構之蕭特基勢壘表面電漿共振生物感測器:設計、製程與驗證
論文名稱(外文):Metal-Dielectric-Metal Structure Based Schottky Barrier Surface Plasmon Resonance Biosensor: Design, Fabrication, and Verification
指導教授:林啟萬林啟萬引用關係
指導教授(外文):Chii-Wann Lin
口試委員:彭盛裕黃念祖陳國平
口試委員(外文):Sheng-Yu PengNien-Tsu HuangKuo-Ping Chen
口試日期:2017-07-05
學位類別:碩士
校院名稱:國立臺灣大學
系所名稱:醫學工程學研究所
學門:工程學門
學類:綜合工程學類
論文種類:學術論文
論文出版年:2017
畢業學年度:105
語文別:中文
論文頁數:92
中文關鍵詞:表面電漿子共振生物感測器金屬-介電質-金屬架構蕭特基勢壘微製程
外文關鍵詞:Surface Plasmon ResonanceBiosensorMetal-Dielectric-Metal StructureSchottky BarrierMicro-Fabrication Processes
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表面電漿子共振是一種發生在金屬-介電質介面的物理現象,在滿足激發條件時,可見光至紅外波段的入射光與金屬內部電子耦合,改沿著金屬-介電質介面傳播,推動電子集體振盪,形成沿介面傳播的電荷密度波,並且此效應對於介面及附近幾百奈米空間內的微小物理參數變化極為敏感,基於這種特性,表面電漿子共振現象成為近年來感測器研究的熱門領域。傳統表面電漿子共振感測器受限於光學激發架構,在維持感測器性能的前提下,其微小化面臨技術瓶頸,而龐大的體積也大大限制了表面電漿子共振生物感測器在室內和室外臨場檢測、田野檢測、床邊檢測和居家照護方面的應用。
本研究創新性地提出在金屬-介電質表面電漿子共振激發架構上形成新的金屬-介電質-金屬蕭特基接觸,利用表面電漿子共振激發熱載流子生成和蕭特基勢壘光電流篩選機制,從理論上解釋表面電漿子共振致光電流生成的原理,以及討論以光電流量測取代傳統光學量測的可行性。基於理論研究的結論,本研究設計了一款金屬-介電質-金屬架構表面電漿子共振生物感測器。在材料選擇上,本研究使用電洞運輸材料氧化銦錫提升光電流生成效率,討論多種氧化物型半導體材料的特性,並藉以確定由Au-TiO2形成蕭特基接觸、TiO2-Ti形成歐姆接觸。在圖形設計上,本研究先後介紹了元件圖形設計及薄膜厚度設計的原因,借助FDTD模擬對設定的感測器架構進行表面電漿激發模擬,從而驗證參數。本研究利用微影製程和薄膜製程完成感測器製造,並設計了一系列實驗,電壓-電流特性量測實驗、表面電漿激發量測實驗,以及物質辨別實驗等,對感測器的功能進行驗證。依據目前的實驗結果,感測器晶片在物質辨別與濃度辨別方面的表現沒有達到理論預期,針對此實驗結果,本論文也從原理、設計、製程及實驗角度檢討了可能存在的問題,並提出未來改善的方向。
We proposed a Metal-Dielectric-Metal structure based Surface Plasmon Resonance Biosensor in this thesis. Surface Plasmon Resonance (SPR) is a physical phenomenon which can be described as a result of interactions occurring at metal-dielectric interface between infrared or visible frequency electromagnetic waves and surface charges in the metal. The most useful merit of SPR, being extremely sensitive to the complex refractive index changing near the interface within a distance range from ~10nm to ~100nm, make SPR become an intensively studied and developed biomedical and biochemical technology in recent decades.
Conventional SPR sensors or commercialized instruments are based on detection of reflected light with a relatively complicated optical and mechanical system, which makes those machine very large and rigorously restricted to operate inside laboratory.
Facing the growing needs of field test, bedside test or other spot test outside the laboratory, a miniaturized SPR sensor based on electro-optical conversion theory are designed, fabricated, and tested in this article. The mentioned energy conversion process and collection is realized by adding another metal layer to the original Metal-Dielectric SPR bilayer excitation structure, which is called the Metal-Dielectric-Metal structure. Theoretical basis including plasmonic hot carriers generation, current flow through a Schottky barrier under a local bias caused by SPR, is explained and discussed. On the basis of theoretical discussion, a device which contains five layers with different patterns is designed. Specifically, a Schottky barrier is formed at Au-TiO2 boundary, while an Ohmic contact is formed at TiO2-Ti boundary, and ITO are used as HTM to assist the carrier pairs separation. Simulation tools, such as Lumerical FDTD and MATLAB, are used in this research to calculate the optimized thickness. The proposed sensor is fabricated via microlithography and thin-film processing technologies, and tested through a series of experiments. Results of series of experiments indicate that the fabricated sensor does not function as expected. Likely reasons are discussed and summarized in the conclusion, and so are the solutions.
口試委員會審定書
I 誌 謝
II 摘 要
III ABSTRACT IV
目 錄 V
圖目錄 VII
表目錄 XII
第1章 緒 論 1
1.1 研究背景 1
1.2 研究動機 2
1.3 研究貢獻 6
1.4 論文架構 7
第2章 基本原理與文獻回顧 8
2.1 金屬表面電漿子共振現象 8
2.2 表面電漿子共振基本原理 8
2.3 表面電漿子共振於生物感測 14
2.4 表面電漿子共振於金屬內形成熱擾動致熱載流子產生 15
2.5 金屬-半導體接觸與蕭特基勢壘 18
2.6 蕭特基勢壘之整流特性 20
2.7 表面電漿於蕭特基接觸區域形成等效偏置影響熱載流子產生及運輸 25
2.8 基於蕭特基勢壘的表面電漿子共振感測原理 27
第3章 感測器設計 30
3.1 金屬-介電質-金屬基本架構設計 30
3.2 蕭特基接觸與歐姆接觸之構成與材料選擇 30
3.3 三維圖形定義 33
3.4 感測器表面電漿激發及傳播模擬 38
第4章 製程方法 41
4.1 光學微影技術及製程操作標準 41
4.2 光罩設計 44
4.3 薄膜製程與製程操作標準 46
4.4 製程實施與品質討論 49
第5章 量測與功能驗證 55
5.1 量測系統架構 55
5.2 量測系統矯正測試 58
5.3 電流-電壓特性測試 58
5.4 電流-角度表面電漿子激發測試 60
5.5 物質檢測實驗 63
5.6 總結與討論 65
第6章 結論及展望 71
參考文獻 72
附錄1 MATLAB模擬角度調變下表面電漿子共振程式 76
附錄2 Microposit® S1800® Series Photo Resists Datasheet 78
附錄3 Microposit® MF®-319 Developer Datasheet 83
附錄4 LabVIEW™儀表控制程式之一 87
附錄5 LabVIEW™儀表控制程式之二 91
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