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|Title:||Negative- U property of oxygen vacancy in cubic Hf O 2|
|Authors:||Feng, Y.P. |
|Citation:||Feng, Y.P., Lim, A.T.L., Li, M.F. (2005). Negative- U property of oxygen vacancy in cubic Hf O 2. Applied Physics Letters 87 (6) : -. ScholarBank@NUS Repository.|
|Abstract:||Oxygen vacancy in cubic Hf O2 was investigated using first-principles calculation based on density functional theory and generalized gradient approximation. Five different charge states (V++, V+, V0, V-, and V - ) were investigated. It was found that the oxygen vacancy in Hf O2 has negative- U behavior and it is energetically favorable for the vacancy to trap two electrons or two holes when the respective charges are injected into the oxide, due to large electron-lattice interaction. Therefore, oxygen vacancy is a main source of charge traps in both n - and p -type metal-oxide-semiconductor field-effect transistors based on Hf O2, and reducing such defects will be useful in limiting charge trapping and in improving the quality of the high- k dielectric in modern complementary metal-oxide semiconductor technology. © 2005 American Institute of Physics.|
|Source Title:||Applied Physics Letters|
|Appears in Collections:||Staff Publications|
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