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Portrait of Erik Lind; Photo: Kennet Ruona

Erik Lind

Professor, Coordinator Nanoelectronics & Nanophotonics

Portrait of Erik Lind; Photo: Kennet Ruona

Impact of doping and diameter on the electrical properties of GaSb nanowires

Author

  • Aein S. Babadi
  • Johannes Svensson
  • Erik Lind
  • Lars Erik Wernersson

Summary, in English

The effect of doping and diameter on the electrical properties of vapor-liquid-solid grown GaSb nanowires was characterized using long channel back-gated lateral transistors and top-gated devices. The measurements showed that increasing the doping concentration significantly increases the conductivity while reducing the control over the channel potential and shifting the threshold voltage, as expected. The highest average mobility was 85 cm2/V·s measured for an unintentionally doped GaSb nanowire with a diameter of 45 nm, whereas medium doped nanowires with large diameters (81 nm) showed a value of 153 cm2/V·s. The mobility is found to be independent of nanowire diameter in the range of 36 nm-68 nm, while the resistivity is strongly reduced with increasing diameter attributed to the surface depletion of charge carriers. The data are in good agreement with an analytical calculation of the depletion depth. A high transconductance was achieved by scaling down the channel length to 200 nm, reaching a maximum value of 80 μS/μm for a top-gated GaSb nanowires transistor with an ON-resistance of 26 kΩ corresponding to 3.9 Ω.mm. The lowest contact resistance obtained was 0.35 Ω·mm for transistors with the highest doping concentration.

Department/s

  • Department of Electrical and Information Technology

Publishing year

2017-01-30

Language

English

Publication/Series

Applied Physics Letters

Volume

110

Issue

5

Document type

Journal article

Publisher

American Institute of Physics (AIP)

Topic

  • Nano Technology
  • Other Electrical Engineering, Electronic Engineering, Information Engineering

Status

Published

ISBN/ISSN/Other

  • ISSN: 0003-6951