Influence of doping profiles on coherent acoustic phonon detection and generation in semiconductors

Hudert, Florian; Bartels, Albrecht; Dekorsy, Thomas; Köhler, Klaus

Influence of doping profiles on coherent acoustic phonon detection and generation in semiconductors

Dateien

JAP_Hudert_2008.pdfGröße: 546.84 KBDownloads: 295

Datum

2008

Autor:innen

Hudert, Florian

Bartels, Albrecht

Dekorsy, Thomas

Köhler, Klaus

Open Access-Veröffentlichung

Open Access Green

Sammlungen

Physik

Publikationstyp

Zeitschriftenartikel

Publikationsstatus

Published

Erschienen in

Journal of Applied Physics. 2008, 104, 123509. Available under: doi: 10.1063/1.3033140

Zusammenfassung

The doping profile in different n-doped GaAs homoepitaxial structures grown by molecular beam epitaxy is investigated in the time domain by employing a laser based picosecond ultrasound technique in a contactless and noninvasive way. Experiments based on asynchronous optical sampling employ two femtosecond lasers, which allow us to detect changes in the optical reflectivity over a 1 ns time delay with a signal-to-noise ratio of 107 and 100 fs time resolution in < 1 min of acquisition time. We show that the doping profile with doping densities of the order of 1018 cm−3 can be detected with picosecond ultrasound, although there is no difference in the acoustic properties of the doped and undoped region. The detection mechanism is based on a different sensitivity function for a coherent strain pulse in the doped and undoped regions. These results are corroborated by experiments at room temperature and 10 K.

Fachgebiet (DDC)

530 Physik

Zitieren

ISO 690

HUDERT, Florian, Albrecht BARTELS, Thomas DEKORSY, Klaus KÖHLER, 2008. Influence of doping profiles on coherent acoustic phonon detection and generation in semiconductors. In: Journal of Applied Physics. 2008, 104, 123509. Available under: doi: 10.1063/1.3033140

BibTex

@article{Hudert2008Influ-5360,
  year={2008},
  doi={10.1063/1.3033140},
  title={Influence of doping profiles on coherent acoustic phonon detection and generation in semiconductors},
  volume={104},
  journal={Journal of Applied Physics},
  author={Hudert, Florian and Bartels, Albrecht and Dekorsy, Thomas and Köhler, Klaus},
  note={Article Number: 123509}
}

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