A novel localized-trapped-charge-induced threshold voltage model for double-fin multi-channel FETs (DFMcFETs)

Hong Wun Gao, Yeong-Her Wang, Te Kuang Chiang

Research output: Contribution to journalArticle

Abstract

With the effects of localized trapped charges on the flat-band voltage, a novel localized-trapped-chargeinduced threshold voltage model for the double-fin multi-channel FET (DFMcFET) is presented based on the quasi-3-D scaling equation and minimum bottom-central potential. It is shown that the deep trench of the DFMcFET is superior to the shallow one in respect of reducing the localized-trapped-charge-induced threshold voltage degradation (LTTVD). Besides, the low drain voltage Vds, the low trapped charge density Nf , the small damaged zone near the drain side Ls and the thin gate oxide tox are required to resist LTTVD as the normalized damaged zone is increased. The LTTVD can be well controlled by the scaling theory. With the fixed damaged zone and trapped charge density, the allowable minimum channel length can be uniquely determined according to the criterion of scaling factor. In comparison to the conventional FinFET, DFMcFET not only provides more conducting channel, but also suffers less threshold voltage degradation caused by the short-channel effects irrespective of trapped charge polarity. With its computational efficiency and simple form, the model can be easily used for the circuit application for DFMcFET.

Original languageEnglish
Article number7855657
Pages (from-to)291-297
Number of pages7
JournalIEEE Transactions on Device and Materials Reliability
Volume17
Issue number2
DOIs
Publication statusPublished - 2017 Jun 1

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Field effect transistors
Threshold voltage
Degradation
Charge density
Electric potential
Computational efficiency
Oxides
Networks (circuits)

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Safety, Risk, Reliability and Quality
  • Electrical and Electronic Engineering

Cite this

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title = "A novel localized-trapped-charge-induced threshold voltage model for double-fin multi-channel FETs (DFMcFETs)",
abstract = "With the effects of localized trapped charges on the flat-band voltage, a novel localized-trapped-chargeinduced threshold voltage model for the double-fin multi-channel FET (DFMcFET) is presented based on the quasi-3-D scaling equation and minimum bottom-central potential. It is shown that the deep trench of the DFMcFET is superior to the shallow one in respect of reducing the localized-trapped-charge-induced threshold voltage degradation (LTTVD). Besides, the low drain voltage Vds, the low trapped charge density Nf , the small damaged zone near the drain side Ls and the thin gate oxide tox are required to resist LTTVD as the normalized damaged zone is increased. The LTTVD can be well controlled by the scaling theory. With the fixed damaged zone and trapped charge density, the allowable minimum channel length can be uniquely determined according to the criterion of scaling factor. In comparison to the conventional FinFET, DFMcFET not only provides more conducting channel, but also suffers less threshold voltage degradation caused by the short-channel effects irrespective of trapped charge polarity. With its computational efficiency and simple form, the model can be easily used for the circuit application for DFMcFET.",
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A novel localized-trapped-charge-induced threshold voltage model for double-fin multi-channel FETs (DFMcFETs). / Gao, Hong Wun; Wang, Yeong-Her; Chiang, Te Kuang.

In: IEEE Transactions on Device and Materials Reliability, Vol. 17, No. 2, 7855657, 01.06.2017, p. 291-297.

Research output: Contribution to journalArticle

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