کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1676912 | 1518093 | 2006 | 6 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Oxygen-vacancy-induced threshold voltage shifts in Hf-related high-k gate stacks
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موضوعات مرتبط
مهندسی و علوم پایه
مهندسی مواد
فناوری نانو (نانو تکنولوژی)
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
We have investigated theoretically the cause of the substantial threshold voltage (Vth) shifts observed in Hf-related high-k gate stacks with p+poly-Si gates, by focusing on the ionic nature of HfO2. The oxygen vacancy (Vo) level in ionic HfO2 is located in a relatively higher part of the band gap. This high position of the Vo level results in a significant elevation of the Fermi level for p+poly-Si gates, if the p+poly-Si gate is in contact with the high-k HfO2. Vo formation in the HfO2 induces a subsequent electron transfer across the interface, causing a substantial Vth shifts in p+poly-Si gate MISFETs. Moreover, our theory also systematically reproduces other recent experimental results.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Thin Solid Films - Volume 508, Issues 1–2, 5 June 2006, Pages 305–310
Journal: Thin Solid Films - Volume 508, Issues 1–2, 5 June 2006, Pages 305–310
نویسندگان
Kenji Shiraishi, Keisaku Yamada, Kazuyoshi Torii, Yasushi Akasaka, Kiyomi Nakajima, Mitsuru Konno, Toyohiro Chikyow, Hiroshi Kitajima, Tsunetoshi Arikado, Yasuo Nara,