Band gap and band offsets for ultrathin (HfO2) x(SiO2)1-x dielectric films on Si (100)

H. Jin; S. K. Oh; H. J. Kang; M. H. Cho

doi:10.1063/1.2355453

Band gap and band offsets for ultrathin (HfO₂) _x(SiO₂)_1-x dielectric films on Si (100)

H. Jin, S. K. Oh, H. J. Kang, M. H. Cho

Department of Physics

Research output: Contribution to journal › Article

69 Citations (Scopus)

Abstract

Energy band profile of ultrathin Hf silicate dielectrics, grown by atomic layer deposition, was studied by using x-ray photoelectron spectroscopy and reflection electron energy loss spectroscopy. The band gap energy only slightly increases from 5.52 eV for (HfO₂)_0.75(SiO ₂)_0.25 to 6.10 eV for (HfO₂) _0.25(SiO₂)_0.75, which is much smaller than 8. 90 eV for SiO₂. For ultrathin Hf silicate dielectrics, the band gap is mainly determined by the Hf 5d conduction band state and the O 2p valence band state. The corresponding conduction band offsets are in the vicinity of 1 eV, which satisfies the minimum requirement for the carrier barrier heights.

Original language	English
Article number	122901
Journal	Applied Physics Letters
Volume	89
Issue number	12
DOIs	https://doi.org/10.1063/1.2355453
Publication status	Published - 2006 Sep 29

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All Science Journal Classification (ASJC) codes

Physics and Astronomy (miscellaneous)

Cite this

Jin, H., Oh, S. K., Kang, H. J., & Cho, M. H. (2006). Band gap and band offsets for ultrathin (HfO₂) _x(SiO₂)_1-x dielectric films on Si (100). Applied Physics Letters, 89(12), [122901]. https://doi.org/10.1063/1.2355453

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10.1063/1.2355453