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

Babadi, Aein S. LU ; Svensson, Johannes LU ; Lind, Erik LU and Wernersson, Lars Erik LU (2017) In Applied Physics Letters 110(5).
Abstract

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... (More)

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.

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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Applied Physics Letters
volume
110
issue
5
publisher
American Institute of Physics
external identifiers
  • scopus:85011371147
  • wos:000394057600042
ISSN
0003-6951
DOI
10.1063/1.4975374
language
English
LU publication?
yes
id
7cb7b864-0b5f-4297-aca8-40db0aa03d0c
date added to LUP
2017-02-15 13:08:46
date last changed
2018-01-07 11:50:00
@article{7cb7b864-0b5f-4297-aca8-40db0aa03d0c,
  abstract     = {<p>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 cm<sup>2</sup>/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 cm<sup>2</sup>/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.</p>},
  articleno    = {053502},
  author       = {Babadi, Aein S. and Svensson, Johannes and Lind, Erik and Wernersson, Lars Erik},
  issn         = {0003-6951},
  language     = {eng},
  month        = {01},
  number       = {5},
  publisher    = {American Institute of Physics},
  series       = {Applied Physics Letters},
  title        = {Impact of doping and diameter on the electrical properties of GaSb nanowires},
  url          = {http://dx.doi.org/10.1063/1.4975374},
  volume       = {110},
  year         = {2017},
}