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博碩士論文 etd-0727118-190144 詳細資訊
Title page for etd-0727118-190144
論文名稱
Title
以奈米壓印技術於LiNbO3基板上製作高頻表面聲波濾波器
Fabrication of high frequency SAW filter on LiNbO3 substrate using the nano-imprinting lithography technology
系所名稱
Department
畢業學年期
Year, semester
語文別
Language
學位類別
Degree
頁數
Number of pages
100
研究生
Author
指導教授
Advisor
召集委員
Convenor
口試委員
Advisory Committee
口試日期
Date of Exam
2018-07-19
繳交日期
Date of Submission
2018-08-28
關鍵字
Keywords
電子束微影技術、指叉式電極、奈米壓印微影技術、表面聲波元件、壓電、鈮酸鋰基板
Surface acoustic wave, LiNbO3 substrate, Interdigital transducers, Piezoelectricity, E-beam lithography technology, Nano-imprinting lithography technology
統計
Statistics
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中文摘要
本研究利用奈米壓印微影技術研製高頻表面聲波濾波器,以代替現今學界與業界常用之紫外光微影技術與電子束微影技術,所設計之頻段適用於4G LTE通訊及GPS系統。實驗中所採用之表面聲波元件結構係於壓電基板LiNbO3上製作指叉式電極,所設計之指叉式電極線寬為650 nm、延遲線長度為16λ、對數為20對,電極材料採用導電性佳、質量密度低及成本低廉之鋁金屬。考量製程良率、成本、實驗時間及鋁電極薄膜之品質等製程因素,將選用負光罩圖層搭配舉離鋁製程來製作元件。
硬模製備部分係選用矽基板,利用電子束微影及感應耦合式電漿蝕刻技術製作,其中,所使用之電子束微影電流為500 pA,dose量為2.7 μs,ICP蝕刻所使用之RF功率為500W,直流偏壓200W,來完成硬模之製作。壓印製程部份係使用PMMA A6作為高分子轉介層,使用之壓力為4.5 MPa,溫度為180°C,時間為5分鐘,以RIE蝕刻PMMA犧牲層,最後蒸鍍鋁金屬並舉離作為電極,完成元件之製作。所完成之元件中心頻率為1.46 GHz,插入損失為-28.6 dB,3dB頻寬達100 MHz,具有大頻寬,高頻化之元件特性。
Abstract
In this study, nano-imprinting lithography (NIL) technology is applied to fabricate the high frequency surface acoustic wave (SAW) filter. Compare with UV lithography and e-beam lithography, NIL has some advantages, including low cost, fast fabrication and so on. The designed interdigital transducers (IDT) patterns are the width of 650 nm, the delay-line length of 16λ and the number of IDT of 20 pairs. The structure of a SAW device consists of the metallic (aluminum) IDT layer on top of the LiNbO3 substrate are fabricated with negative photomask design and lift-off process.
Moreover, e-beam lithography and inductively coupled plasma technology are used to fabricate a hard mold by beam current of 500 pA, dose time of 2.7 μs in EBW process, and RF power of 500 W, DC bias of 200 W in ICP process. The nano-imprinting lithography process was performed to transfer IDT patterns onto LiNbO3 substrate at temperature of 180°C and pressure of 4.5 MPa. After imprinting, PMMA scarification layer is etched by reactive ion etching technology. Finally, aluminum IDT pattern is deposited onto LiNbO3 substrate and lift-off. The obtained frequency response of SAW filter is center of frequency of 1.46 GHz, insertion loss of -28.6 dB and 3dB bandwidth of 100 MHz.
目次 Table of Contents
中文審定書 i
英文審定書 ii
摘要 iii
Abstract iv
目錄 vi
圖目錄 ix
表目錄 xii
第一章 前言 1
1.1 研究背景與動機 1
1.2 表面聲波元件參考文獻回顧 3
1.3 奈米壓印微影技術簡介 5
1.3.1 熱壓奈米壓印微影技術 5
1.3.2 紫外光奈米壓印微影技術 6
1.3.3 軟微影技術 7
1.3.4 步進式快閃奈米壓印微影技術 8
1.3.5 雷射輔助奈米壓印微影技術 9
1.4 研究內容 11
第二章 理論分析 12
2.1 壓電效應 12
2.2 表面聲波濾波器原理 15
2.2.1 表面聲波濾波器基礎設計與特性 16
2.2.2 表面聲波濾波器參數性質 19
2.2.3 表面聲波元件種類 21
2.3 電子束微影製程技術 23
2.4 奈米壓印微影製程技術 24
2.5 乾式蝕刻技術 27
2.6 聚甲基丙烯酸甲酯結構與特性 30
2.7 鈮酸鋰結構與特性 32
2.8 全氟辛烷基三氯矽烷結構與特性 33
第三章 實驗 34
3.1 實驗流程 34
3.2 基板清潔 35
3.3 硬模製作 36
3.3.1 IDT電極結構設計 36
3.4 聲波元件製備 41
3.4.1 脫模劑/矽硬模製備 41
3.4.2 矽硬模清潔 42
3.5 實驗製程儀器 44
3.5.1 電子束微影系統(Electron beam lithography system, EBL) 44
3.5.2 感應式耦合電漿系統(Inductively coupled plasma system, ICP) 45
3.5.3 奈米壓印機 46
3.5.4 反應式離子蝕刻系統(Reactive ion etching system, RIE) 47
3.5.5 熱蒸鍍系統 48
3.5.6 橢圓偏光儀(Ellipsometer) 48
3.5.7 掃描式電子顯微鏡(Scanning Electron Microscopy, SEM) 49
3.5.8 原子力顯微鏡(Atomic Force Microscopy, AFM) 50
3.5.9 網路分析儀(Network analyzer) 51
第四章 結果與討論 52
4.1 矽硬模製備 52
4.1.1 指叉式電極結構設計 52
4.1.2 電子束微影製程 57
4.1.3 感應耦合式電漿製程 63
4.2 SAW元件製備 66
4.2.1 PMMA厚度檢測 66
4.2.2 沉積脫模劑於硬模 67
4.2.3 熱壓奈米壓印參數分析 68
4.2.4 蝕刻PMMA犧牲層參數分析 73
4.2.5 指叉式電極之製作 78
4.2.6 SAW元件之頻率響應分析 80
第五章 結論 82
參考文獻 84
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