Determination of tunnel mass and physical thickness of gate oxide including poly-Si/SiO2 and Si/SiO2 interfacial transition layers

Hiroshi Watanabe*, Daisuke Matsushita, Kouichi Muraoka

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

24 Scopus citations


By including poly-Si/SiO2 and Si/SiO2 interfacial transition (IFT) layers, an excellent agreement in terms of both C-V and J-V characteristics is obtained between the experiment and theory for both polarities of gate voltage (VG) for the first time. The highly precise physical models for gate depletion and gate accumulation bring an oxide thickness extracted from the C-V fitting in a negative VG close to that extracted in a positive VG. It is shown that the physical oxide thickness should be regarded as a distance between the middle points inside the IFT layers in both sides of the gate oxide. In addition, it is found that the tunnel mass is independent of the gate-oxide thickness from 14 to 28 Å. It is also shown that the oxide-thickness dependence of the tunnel mass [13], [15]-[17] is ascribable to the C-V-J-V fitting only in the case of a negative polarity of VG while neglecting the poly-Si/SiO2 IFT layer.

Original languageEnglish
Pages (from-to)1323-1330
Number of pages8
JournalIEEE Transactions on Electron Devices
Issue number6
StatePublished - 1 Jun 2006


  • Dielectrics
  • Gate capacitance
  • Gate oxide
  • Interfacial transition (IFT) layer
  • Suboxide
  • Tunnel mass

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