利用電子束微影製作高密度石英柱狀結構; Fabrication of high density quartz pillars by electron beam lithography

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Title:	利用電子束微影製作高密度石英柱狀結構;Fabrication of high density quartz pillars by electron beam lithography
Authors:	許景翔;Xu,Jing-Xiang
Contributors:	機械工程學系
Keywords:	電子束微影;濕蝕刻;石英非等向性蝕刻;柱狀奈米結構;electron beam lithography;wet etching;anisotropic etching of quartz;nanopillars
Date:	2013-08-27
Issue Date:	2013-10-08 15:28:57 (UTC+8)
Publisher:	國立中央大學
Abstract:	石英具有良好的壓電及熱穩定性，在各種電子元件上有廣泛的應用。例如:濾波器、石英晶體微天平及振盪器等。將奈米柱狀結構製作在石英元件上，可以利用表面積大的特性，增加感測面積、提高感測器靈敏度。如:表面聲波元件、化學物質感測器，或利用其表面特性的改變，製作有抗污、自潔特性的元件。本文利用電子束微影(Electron Beam Lithography,EBL)製作奈米柱狀結構，光學微影系統由於波長的關係，更小的解析度難以實現；電子束微影利用電子束作為曝光源，所以波長比一般傳統光學微影系統更小，可以實現更小的線寬。由於石英為絕緣基板，必須先在表面覆蓋一層導電性材料，防止電荷累積。本研究將鉻金屬薄膜沉積在石英基板，再利用電子束微影將聚甲基丙烯酸甲酯(Polymethyl methacrylate,PMMA)光阻刻寫圖形，最後利用濕蝕刻方式蝕刻出奈米柱狀結構。本文探討利用電子束微影及非等向性蝕刻製作石英柱狀奈米結構之限制與考量，利用結構外形及遮罩寬度去分析討論高密度柱狀結構的關係和限制。結果發現在微小尺寸下，光阻厚度、蝕刻遮罩厚度及底切現象限制了柱狀結構的長度與密度，不同的遮罩圖形寬度、間距與結構排列方式，對外形輪廓沒有太大影響。而圓形遮罩在遮罩尺寸損失與結構完整度都比方形遮罩來的差。預測蝕刻外形與實驗數據比較，雖然有所誤差，但是蝕刻趨勢及外形輪廓一致。設計規則排列圖形進行非等向性蝕刻，提供蝕刻及遮罩限制資訊，對未來奈米遮罩石英濕蝕刻實驗設計有所幫助。 Quartz has good piezoelectricity and thermal stability. It has been widely used in electronics-industry, such as wave filters, microbalances, and oscillators. The nanopillars on quartz devices, may increase their performance due to the large surface area or produced a self-cleaning surface. The nanopillar structure was fabricated by electron beam lithography (EBL) to produce nanoscale patterns. A chromium thin film was evaporated on quartz surface to avoid the electric charge accumulation. The patterns were written on the resist (Polymethyl methacrylate PMMA). The nanopillars were finally fabricated by wet etching. The limitation and fabrication isuues was evaluated in this research. It was found that the thickness of the resist and the maskant layer are important in fabricating nanoscale patterns. The mask width and its associated undercut are especially critical to have succesful results in quartz anisotropic etching. The relationship and limit of the fabricated pillar geometry and density were also analyzed. It was founded no considerable effects on the pillar length for different pattern widths, spacings, and arrangements. For the structure integrity, the circle patterns are worse than the square patterns. The predicted etching profile was performed from ealier experiments of larger structures, and is found to agree with this present work. The study is helpful in nanosize quartz wet etching in the future.
Appears in Collections:	[Graduate Institute of Mechanical Engineering] Electronic Thesis & Dissertation

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