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Photoexcitation of excitons in self-assembled quantum dots

Pettersson, H; Landin, L; Liu, R; Seifert, Werner LU ; Pistol, Mats-Erik LU and Samuelson, Lars LU (2004) In Applied Physics Letters 85(21). p.5046-5048
Abstract
Using an approach of combining Fourier transform infrared spectroscopy with resonant illumination from a secondary external light source, we have measured the photocurrent (PC) for multiple layers of self-assembled InAs dots embedded in a matrix of InP. Without external illumination, we observe photoexcitation of electrons from bound states in the dots to the InP barrier. By additional illumination from the external light source, a strong broadening of the PC signal is observed. We interpret this broadening in terms of photoexcitation of electrons in the presence of additional holes in the dots created by the external light source. We extract the spectral distribution of the photoexcitation process at 6 and 77 K, respectively, and show by... (More)
Using an approach of combining Fourier transform infrared spectroscopy with resonant illumination from a secondary external light source, we have measured the photocurrent (PC) for multiple layers of self-assembled InAs dots embedded in a matrix of InP. Without external illumination, we observe photoexcitation of electrons from bound states in the dots to the InP barrier. By additional illumination from the external light source, a strong broadening of the PC signal is observed. We interpret this broadening in terms of photoexcitation of electrons in the presence of additional holes in the dots created by the external light source. We extract the spectral distribution of the photoexcitation process at 6 and 77 K, respectively, and show by comparison with theoretical calculations that it is consistent with an exciton binding energy of 20 meV. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Applied Physics Letters
volume
85
issue
21
pages
5046 - 5048
publisher
American Institute of Physics
external identifiers
  • wos:000225300600073
  • scopus:19144366094
ISSN
0003-6951
DOI
10.1063/1.1824174
language
English
LU publication?
yes
id
386348a8-1502-4794-9931-7582a04cfabf (old id 260363)
date added to LUP
2007-10-26 15:02:36
date last changed
2017-01-01 05:01:13
@article{386348a8-1502-4794-9931-7582a04cfabf,
  abstract     = {Using an approach of combining Fourier transform infrared spectroscopy with resonant illumination from a secondary external light source, we have measured the photocurrent (PC) for multiple layers of self-assembled InAs dots embedded in a matrix of InP. Without external illumination, we observe photoexcitation of electrons from bound states in the dots to the InP barrier. By additional illumination from the external light source, a strong broadening of the PC signal is observed. We interpret this broadening in terms of photoexcitation of electrons in the presence of additional holes in the dots created by the external light source. We extract the spectral distribution of the photoexcitation process at 6 and 77 K, respectively, and show by comparison with theoretical calculations that it is consistent with an exciton binding energy of 20 meV.},
  author       = {Pettersson, H and Landin, L and Liu, R and Seifert, Werner and Pistol, Mats-Erik and Samuelson, Lars},
  issn         = {0003-6951},
  language     = {eng},
  number       = {21},
  pages        = {5046--5048},
  publisher    = {American Institute of Physics},
  series       = {Applied Physics Letters},
  title        = {Photoexcitation of excitons in self-assembled quantum dots},
  url          = {http://dx.doi.org/10.1063/1.1824174},
  volume       = {85},
  year         = {2004},
}