研究生: |
陳力銘 Chen, Li-Ming |
---|---|
論文名稱: |
鋁添加於非晶氧化矽之電阻轉換行為之研究及其電極材料的影響 The study of resistive switching behavior of Al-added amorphous SiOx and electrode effect |
指導教授: |
張士欽
Chang, Shih-Chin 金重勳 Chin, Tsung-Shune |
口試委員: | |
學位類別: |
碩士 Master |
系所名稱: |
工學院 - 材料科學工程學系 Materials Science and Engineering |
論文出版年: | 2010 |
畢業學年度: | 98 |
語文別: | 中文 |
論文頁數: | 98 |
中文關鍵詞: | 電阻式記憶體 、非晶 、矽基氧化物 、電阻轉換行為 |
外文關鍵詞: | RRAM, amorphous, Si-based oxide, resistive switching |
相關次數: | 點閱:3 下載:0 |
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電阻式記憶體(Resistive RAM)為近年來受到高度注意的新型非揮發性記憶體。韓國三星電子於2004年表示RRAM具有超越被譽為新一代夢幻記憶體MRAM(Magnetoresistive RAM)的潛力。RRAM更在2010年被EETimes美國版所選出的十項具潛力新興技術。RRAM有著讀寫速度快,結構簡單,驅動的電壓低,耗能低等優點,目前屬於發展初期的百家爭鳴階段,本實驗研究非晶氧化矽材料的電阻轉換行為,並在非晶氧化矽中添加的微量的鋁( < 2 at %)來誘發許多缺陷如氧空缺的產生,再加上製程參數的調整,控制不同程度的鋁添加量、鍍膜時候的氬氧比(Ar/O2 ratio)、以及Al-SiOx厚度等等,找出Al-SiOx的電阻轉換的鍍膜最佳參數,期望以Al-SiOx薄膜製程簡單,成本低,和半導體製程相容性極高的優勢,未來有潛力可以應用在RRAM上。
最佳參數試片Pt/Al-SiOx(WAl = 15 W、PO2 = 15 %、厚度30 nm)/TiN表現單極電阻轉換行為,電性表現為:Foming電壓為15 V(CC 5 mA);循環次數100次以內RESET電壓為1V,SET電壓為2.2 V(CC 3 mA);最佳循環次數有676次,但中間會有兩次RESET電壓躍升;高低電阻態相當穩定,其比值為102;高低電阻態可以穩定維持達1 × 104秒。經過許多分析結果顯示出其電阻轉換機制屬於Thermochemical system,其導通路徑由氧空缺組成。
透過更換上電極來探討不同電極對電性表現的影響,更換為Al上電極會造成Al/Al-SiOx交界面形成氧化物而失效;更換為Ti上電極則沒有改善電性表現;更換為Cu上電極後可以表現出單極或是雙極電阻轉換行為,其中雙極電轉換行為較穩定, forming電壓為2.2 V(CC 1 mA),RESET電壓-0.5 V,SET電壓0.6 V(CC 500 □A),循環次數達68次,高低電阻態比值有10。經過許多分析,結果顯示出雙極電阻轉換機制屬於Electrochemical Metallization System,靠Cu的氧化還原形成Cu的導通路徑;單極電阻轉換機制屬於Electrochemical Metallization System,同樣靠著Cu的還原形成Cu的導通路徑,但RESET靠Joule-heating。
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