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Photocurrent spectroscopy on self-assembled InAs quantum dots embedded in InP

Pettersson, H; Landin, L; Fu, Y; Kleverman, Mats LU ; Borgström, Magnus LU ; Seifert, Werner LU and Samuelson, Lars LU (2005) In Microelectronics Journal 36(3-6). p.227-230
Abstract
In this work, we report on an overview of recent results from Fourier transform photocurrent (FTPC) measurements in the infrared spectral region on ensembles of self-assembled InAs quantum dots embedded in a matrix of InP. In interband PC, clear signals related to the dots are observed. Comparing the PC- and PL spectra, we observe that the fundamental transition is absent in the PC spectra, which we interpret in terms of Pauliblocking due to a filled electron ground state of the dots. Our results furthermore suggest that an Auger process is involved in forming the interband PC signal. In intersubband PC, peaks related to transitions from the dots' ground- and first excited states to the conduction band of the matrix are observed. Using a... (More)
In this work, we report on an overview of recent results from Fourier transform photocurrent (FTPC) measurements in the infrared spectral region on ensembles of self-assembled InAs quantum dots embedded in a matrix of InP. In interband PC, clear signals related to the dots are observed. Comparing the PC- and PL spectra, we observe that the fundamental transition is absent in the PC spectra, which we interpret in terms of Pauliblocking due to a filled electron ground state of the dots. Our results furthermore suggest that an Auger process is involved in forming the interband PC signal. In intersubband PC, peaks related to transitions from the dots' ground- and first excited states to the conduction band of the matrix are observed. Using a novel approach of combining FTPC with illumination from an additional external nonmodulated light source, we have measured the spectral distribution of photoionization of excitons in quantum dots and found an exciton binding energy in good agreement with theoretical calculations. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
exiton photoionization, QDIP, photocurrent spectroscopy
in
Microelectronics Journal
volume
36
issue
3-6
pages
227 - 230
publisher
Elsevier
external identifiers
  • wos:000229666000016
  • scopus:33644542110
ISSN
0026-2692
DOI
10.1016/j.mejo.2005.02.011
language
English
LU publication?
yes
id
c3143d67-3a40-4187-93b8-8b8a9550f6ed (old id 237367)
date added to LUP
2007-08-22 14:48:04
date last changed
2017-01-01 07:13:48
@article{c3143d67-3a40-4187-93b8-8b8a9550f6ed,
  abstract     = {In this work, we report on an overview of recent results from Fourier transform photocurrent (FTPC) measurements in the infrared spectral region on ensembles of self-assembled InAs quantum dots embedded in a matrix of InP. In interband PC, clear signals related to the dots are observed. Comparing the PC- and PL spectra, we observe that the fundamental transition is absent in the PC spectra, which we interpret in terms of Pauliblocking due to a filled electron ground state of the dots. Our results furthermore suggest that an Auger process is involved in forming the interband PC signal. In intersubband PC, peaks related to transitions from the dots' ground- and first excited states to the conduction band of the matrix are observed. Using a novel approach of combining FTPC with illumination from an additional external nonmodulated light source, we have measured the spectral distribution of photoionization of excitons in quantum dots and found an exciton binding energy in good agreement with theoretical calculations.},
  author       = {Pettersson, H and Landin, L and Fu, Y and Kleverman, Mats and Borgström, Magnus and Seifert, Werner and Samuelson, Lars},
  issn         = {0026-2692},
  keyword      = {exiton photoionization,QDIP,photocurrent spectroscopy},
  language     = {eng},
  number       = {3-6},
  pages        = {227--230},
  publisher    = {Elsevier},
  series       = {Microelectronics Journal},
  title        = {Photocurrent spectroscopy on self-assembled InAs quantum dots embedded in InP},
  url          = {http://dx.doi.org/10.1016/j.mejo.2005.02.011},
  volume       = {36},
  year         = {2005},
}