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Intraband absorption and photocurrent spectroscopy of self-assembled p-type Si/SiGe quantum dots

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7 Author(s)
Fromherz, T. ; Institut für Halbleiter- und Festkörperphysik, Universität Linz, Altenbergerstraße 69, A-4040 Linz, Austria ; Mac, W. ; Hesse, A. ; Bauer, G.
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In infrared transmission and photocurrent spectra of self-assembled SiGe quantum dot samples grown in the Stranski–Krastanow mode at temperatures around T=520 °C different types of transitions are observed: in the transmission experiments, an absorption line due to bound-to-bound transitions is measured whereas the photocurrent spectra are determined by bound-to-continuum transitions. The experimental determination of the energies of both types of transitions for the same sample allows a detailed discussion of the features observed in the spectra as well as an estimate of the average Ge content in the dots. © 2002 American Institute of Physics.

Published in:

Applied Physics Letters  (Volume:80 ,  Issue: 12 )

Date of Publication:

Mar 2002

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