5-1 結論
本研究成功在矽基材上利用二階段陽極氧化處理製備出孔洞直徑 75nm,長度 500~800nm的高規則AAO模板,並以電鍍法在AAO模板內選擇 性沉積出鈷的奈米柱與奈米點;此外,鈷的奈米點可做為觸媒,使用 ECR-CVD,在 600℃下以CH4及H2為製程氣體,配合AAO模板的輔助,合 成高準直性的多壁奈米碳管陣列,其中CNT的管徑大小及方向,受到AAO 模板所規範。若調整ECR-CVD合成時間,可控制CNT長度;若改變電鍍鈷 時間,在鋁膜上,CNT密度隨電鍍鈷時間增加而下降;在AAO模板上,CNT 密度隨電鍍鈷時間增加而增加,當電鍍鈷時間60 秒時,得到最佳CNT場發 射特性,其起始電場為5.88V/μm,場發射增強因子β值為 1135。本研究亦 成功製備出AAO-CNT的三極結構,利用AAO模板的輔助,其CNT方向具準 直性、密度有可控性。本研究亦能直接在4 吋晶圓上製備出AAO-CNT,未 來的目標是在4 吋晶圓上成功的製備出AAO-CNT三極體結構。
5-2 未來展望
1. 調整 CNT 製程參數及掌控 AAO-CNT 的成長製程,尋求最佳場發射特 性,再以不同電鍍鈷時間改變CNT 密度,探討其場發射變化。
2. 對 AAO-CNT 三極體結構做電性量測。並在三極體結構內,改變 CNT 長度,在維持低表面粗糙度的原則下,探討CNT 長度與場發射的關聯 性。以電鍍鈷時間改變CNT 密度,尋求最佳 AAO-CNT 三極體結構場 發射特性的製程參數。
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