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Portrait of Reine Wallenberg. Photo: Kennet Ruona

Reine Wallenberg

Professor, Coordinator Materials Science

Portrait of Reine Wallenberg. Photo: Kennet Ruona

High-Frequency Performance of Self-Aligned Gate-Last Surface Channel In0.53Ga0.47As MOSFET

Author

  • Mikael Egard
  • Lars Ohlsson
  • Mats Ärlelid
  • Karl-Magnus Persson
  • Mattias Borg
  • Filip Lenrick
  • Reine Wallenberg
  • Erik Lind
  • Lars-Erik Wernersson

Summary, in English

We have developed a self-aligned L-g = 55 nm In-0.53 Ga-0.47 As MOSFET incorporating metal-organic chemical vapor deposition regrown n(++) In0.6Ga0.4As source and drain regions, which enables a record low on-resistance of 199 Omega mu m. The regrowth process includes an InP support layer, which is later removed selectively to the n(++) contact layer. This process forms a high-frequency compatible device using a low-complexity fabrication scheme. We report on high-frequency measurements showing f(max) of 292 GHz and f(t) of 244 GHz. These results are accompanied by modeling of the device, which accounts for the frequency response of gate oxide border traps and impact ionization phenomenon found in narrow band gap FETs. The device also shows a high drive current of 2.0 mA/mu m and a high extrinsic transconductance of 1.9 mS/mu m. These excellent properties are attributed to the use of a gate-last process, which does not include high temperature or dry-etch processes.

Department/s

  • Solid State Physics
  • Department of Electrical and Information Technology
  • Centre for Analysis and Synthesis
  • NanoLund

Publishing year

2012

Language

English

Pages

369-371

Publication/Series

IEEE Electron Device Letters

Volume

33

Issue

3

Document type

Journal article

Publisher

IEEE - Institute of Electrical and Electronics Engineers Inc.

Topic

  • Electrical Engineering, Electronic Engineering, Information Engineering

Keywords

  • Gate-last
  • InGaAs
  • metal-organic chemical vapor deposition (MOCVD)
  • regrowth
  • MOSFET
  • self-aligned
  • surface channel

Status

Published

ISBN/ISSN/Other

  • ISSN: 0741-3106