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科技與工程學院
光電工程研究所
學位論文
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學位論文
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http://rportal.lib.ntnu.edu.tw/handle/20.500.12235/73896
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氧化鉿鋯之鋯濃度最佳化應用於三維垂直式鐵電穿隧接面元件與低溫翻轉響應之鐵電隨機存取記憶體
(
2023
)
張福生
;
Chang, Fu-Sheng
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由於鐵電氧化鉿鋯(Hf1-xZrxO2, HZO)材料具有極化的特性應用於非揮發性記憶體研究,此論文透過原子層沉積調控摻雜鋯的比例以研究鐵電穿隧接面元件(Ferroelectric Tunnel Junctions, FTJ),更進一步設計三維立體垂直式FTJ,實現高密度陣列記憶體,在相同面積占比下堆疊FTJ元件,並展示其具有邏輯閘操作潛力,電流開關比達到1500倍,此外透過低溫量測來探討鐵電記憶體(FeRAM)的操作速度極限,結果顯示反鐵電電容的操作速度優於正鐵電電容,且證明部分四方晶相 (tetragonal phase)主導的反鐵氧化鉿鋯在低溫下會部分轉變成正交晶相 (orthorhombic phase) 進而導致殘餘極化量上升創造更佳的記憶存取空間,提升反鐵電電容應用在未來新興記憶體的潛力。
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