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Doping GaP Core-Shell Nanowire pn-Junctions: A Study by Off-Axis Electron Holography

Yazdi, Sadegh; Berg, Alexander LU ; Borgström, Magnus LU ; Kasama, Takeshi; Beleggia, Marco; Samuelson, Lars LU and Wagner, Jakob B. (2015) In Small 11(22). p.2687-2695
Abstract
The doping process in GaP core-shell nanowire pn-junctions using different precursors is evaluated by mapping the nanowires' electrostatic potential distribution by means of off-axis electron holography. Three precursors, triethyltin (TESn), ditertiarybutylselenide, and silane are investigated for n-type doping of nanowire shells; among them, TESn is shown to be the most efficient precursor. Off-axis electron holography reveals higher electrostatic potentials in the regions of nanowire cores grown by the vapor-liquid-solid (VLS) mechanism (axial growth) than the regions grown parasitically by the vapor-solid (VS) mechanism (radial growth), attributed to different incorporation efficiency between VLS and VS of unintentional p-type carbon... (More)
The doping process in GaP core-shell nanowire pn-junctions using different precursors is evaluated by mapping the nanowires' electrostatic potential distribution by means of off-axis electron holography. Three precursors, triethyltin (TESn), ditertiarybutylselenide, and silane are investigated for n-type doping of nanowire shells; among them, TESn is shown to be the most efficient precursor. Off-axis electron holography reveals higher electrostatic potentials in the regions of nanowire cores grown by the vapor-liquid-solid (VLS) mechanism (axial growth) than the regions grown parasitically by the vapor-solid (VS) mechanism (radial growth), attributed to different incorporation efficiency between VLS and VS of unintentional p-type carbon doping originating from the trimethylgallium precursor. This study shows that off-axis electron holography of doped nanowires is unique in terms of the ability to map the electrostatic potential and thereby the active dopant distribution with high spatial resolution. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
core-shell nanowires, nanowires, doping, electrostatic potential, potential maps, gallium phosphide, electron holography
in
Small
volume
11
issue
22
pages
2687 - 2695
publisher
John Wiley & Sons
external identifiers
  • wos:000355873500014
  • scopus:84930683710
ISSN
1613-6829
DOI
10.1002/smll.201403361
language
English
LU publication?
yes
id
e5f94020-3e14-45d9-8515-a0790de8fade (old id 7602216)
date added to LUP
2015-07-22 11:21:04
date last changed
2017-10-22 03:31:21
@article{e5f94020-3e14-45d9-8515-a0790de8fade,
  abstract     = {The doping process in GaP core-shell nanowire pn-junctions using different precursors is evaluated by mapping the nanowires' electrostatic potential distribution by means of off-axis electron holography. Three precursors, triethyltin (TESn), ditertiarybutylselenide, and silane are investigated for n-type doping of nanowire shells; among them, TESn is shown to be the most efficient precursor. Off-axis electron holography reveals higher electrostatic potentials in the regions of nanowire cores grown by the vapor-liquid-solid (VLS) mechanism (axial growth) than the regions grown parasitically by the vapor-solid (VS) mechanism (radial growth), attributed to different incorporation efficiency between VLS and VS of unintentional p-type carbon doping originating from the trimethylgallium precursor. This study shows that off-axis electron holography of doped nanowires is unique in terms of the ability to map the electrostatic potential and thereby the active dopant distribution with high spatial resolution.},
  author       = {Yazdi, Sadegh and Berg, Alexander and Borgström, Magnus and Kasama, Takeshi and Beleggia, Marco and Samuelson, Lars and Wagner, Jakob B.},
  issn         = {1613-6829},
  keyword      = {core-shell nanowires,nanowires,doping,electrostatic potential,potential maps,gallium phosphide,electron holography},
  language     = {eng},
  number       = {22},
  pages        = {2687--2695},
  publisher    = {John Wiley & Sons},
  series       = {Small},
  title        = {Doping GaP Core-Shell Nanowire pn-Junctions: A Study by Off-Axis Electron Holography},
  url          = {http://dx.doi.org/10.1002/smll.201403361},
  volume       = {11},
  year         = {2015},
}