Abstract
This letter focuses on studying the characteristic behavior of oxygen in La-silicate dielectrics by comparison with HfO 2 dielectrics. V FB shift of La-silicate caused by oxygen annealing is found to be stable even after reduction annealing unlike with HfO 2. Moreover, reduced gate leakage current and improved effective mobility of nMOSFETs with La-silicate are observed by oxygen incorporation, suggesting the annihilation of oxygen vacancy. Since the oxygen in La-silicate covalently exists adjacent to the Si atom, stability of oxygen in La-silicate can be understood in terms of strong bonding of covalent nature.
Original language | English |
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Article number | 6129473 |
Pages (from-to) | 423-425 |
Number of pages | 3 |
Journal | IEEE Electron Device Letters |
Volume | 33 |
Issue number | 3 |
DOIs | |
Publication status | Published - 2012 Mar |
Externally published | Yes |
Keywords
- Covalent nature
- HfO
- La-silicate
- high-k gate dielectrics
- ionic nature
- oxygen vacancy
ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Electrical and Electronic Engineering