Threshold voltage calculation in ultrathin-film SOI MOSFETs using the effective potential

Stephen M. Ramey, David K. Ferry

Research output: Contribution to journalArticle

8 Citations (Scopus)

Abstract

The success of the effective potential method of including quantum confinement effects in simulations of MOSFETs is based on the ability to calculate ahead of time the extent of the Gaussian wave packet used to describe the electron. In the calculation of the Gaussian, the inversion layer is assumed to form in a triangular potential well, from which a suitable standard deviation can be obtained. The situation in an ultrathin silicon-on-insulator (SOI) MOSFET is slightly different, in that the potential well has a triangular bottom, but there is a significant contribution to the confinement from the rectangular barriers formed by the gate oxide and the buried oxide. For this more complex potential well, it is of interest to determine the range of applicability of the effective potential model with a constant standard deviation. In this paper, we include this effective potential model in Monte Carlo calculations of the threshold voltage of ultrathin SOI MOSFETs. We find that the effective potential recovers the expected trend in threshold voltage shift with decreasing silicon thickness, down to a thickness of approximately 3 nm.

Original languageEnglish (US)
Pages (from-to)121-125
Number of pages5
JournalIEEE Transactions on Nanotechnology
Volume2
Issue number3
DOIs
StatePublished - Sep 2003

Fingerprint

Ultrathin films
Threshold voltage
Silicon
Inversion layers
Wave packets
Oxides
Quantum confinement
Electrons

Keywords

  • Monte Carlo methods
  • MOSFETs
  • Quantum theory
  • Semiconductor-insulator interfaces
  • Silicon-on-insulator (SOI) technology

ASJC Scopus subject areas

  • Engineering(all)
  • Hardware and Architecture

Cite this

Threshold voltage calculation in ultrathin-film SOI MOSFETs using the effective potential. / Ramey, Stephen M.; Ferry, David K.

In: IEEE Transactions on Nanotechnology, Vol. 2, No. 3, 09.2003, p. 121-125.

Research output: Contribution to journalArticle

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