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Confinement in Thickness-Controlled GaAs Polytype Nanodots.

Vainorius, Neimantas LU ; Lehmann, Sebastian LU ; Jacobsson, Daniel LU ; Samuelson, Lars LU ; Dick , Kimberly LU and Pistol, Mats-Erik LU (2015) In Nano Letters 15(4). p.2652-2656
Abstract
Polytype nanodots are arguably the simplest nanodots than can be made, but their technological control was, up to now, challenging. We have developed a technique to produce nanowires containing exactly one polytype nanodot in GaAs with thickness control. These nanodots have been investigated by photoluminescence, which has been cross-correlated with transmission electron microscopy. We find that short (4-20 nm) zincblende GaAs segments/dots in wurtzite GaAs confine electrons and that the inverse system confines holes. By varying the thickness of the nanodots we find strong quantum confinement effects which allows us to extract the effective mass of the carriers. The holes at the top of the valence band have an effective mass of... (More)
Polytype nanodots are arguably the simplest nanodots than can be made, but their technological control was, up to now, challenging. We have developed a technique to produce nanowires containing exactly one polytype nanodot in GaAs with thickness control. These nanodots have been investigated by photoluminescence, which has been cross-correlated with transmission electron microscopy. We find that short (4-20 nm) zincblende GaAs segments/dots in wurtzite GaAs confine electrons and that the inverse system confines holes. By varying the thickness of the nanodots we find strong quantum confinement effects which allows us to extract the effective mass of the carriers. The holes at the top of the valence band have an effective mass of approximately 0.45 m0 in wurtzite GaAs. The thinnest wurtzite nanodot corresponds to a twin plane in zincblende GaAs and gives efficient photoluminescence. It binds an exciton with a binding energy of roughly 50 meV, including central cell corrections. (Less)
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organization
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type
Contribution to journal
publication status
published
subject
in
Nano Letters
volume
15
issue
4
pages
2652 - 2656
publisher
The American Chemical Society
external identifiers
  • pmid:25761051
  • wos:000352750200066
  • scopus:84926648820
ISSN
1530-6992
DOI
10.1021/acs.nanolett.5b00253
language
English
LU publication?
yes
id
8851d02b-a946-46d8-9bc1-d646e2774a90 (old id 5264682)
alternative location
http://www.ncbi.nlm.nih.gov/pubmed/25761051?dopt=Abstract
date added to LUP
2015-04-03 17:30:32
date last changed
2017-10-22 03:30:54
@article{8851d02b-a946-46d8-9bc1-d646e2774a90,
  abstract     = {Polytype nanodots are arguably the simplest nanodots than can be made, but their technological control was, up to now, challenging. We have developed a technique to produce nanowires containing exactly one polytype nanodot in GaAs with thickness control. These nanodots have been investigated by photoluminescence, which has been cross-correlated with transmission electron microscopy. We find that short (4-20 nm) zincblende GaAs segments/dots in wurtzite GaAs confine electrons and that the inverse system confines holes. By varying the thickness of the nanodots we find strong quantum confinement effects which allows us to extract the effective mass of the carriers. The holes at the top of the valence band have an effective mass of approximately 0.45 m0 in wurtzite GaAs. The thinnest wurtzite nanodot corresponds to a twin plane in zincblende GaAs and gives efficient photoluminescence. It binds an exciton with a binding energy of roughly 50 meV, including central cell corrections.},
  author       = {Vainorius, Neimantas and Lehmann, Sebastian and Jacobsson, Daniel and Samuelson, Lars and Dick , Kimberly and Pistol, Mats-Erik},
  issn         = {1530-6992},
  language     = {eng},
  number       = {4},
  pages        = {2652--2656},
  publisher    = {The American Chemical Society},
  series       = {Nano Letters},
  title        = {Confinement in Thickness-Controlled GaAs Polytype Nanodots.},
  url          = {http://dx.doi.org/10.1021/acs.nanolett.5b00253},
  volume       = {15},
  year         = {2015},
}