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Pathway of Porous Silicon Formation Inside Si Nanowires Throughout Metal Assisted Etching

Published online by Cambridge University Press:  12 April 2012

Alexander A. Tonkikh ,
Nadine Geyer ,
Bodo Fuhrmann ,
Hartmut S. Leipner  and
Peter Werner
Alexander A. Tonkikh
Affiliation:
Max Planck Institute of Microstructure Physics, 2 Weinberg, Halle, D-06120, Germany
Nadine Geyer
Affiliation:
Max Planck Institute of Microstructure Physics, 2 Weinberg, Halle, D-06120, Germany
Bodo Fuhrmann
Affiliation:
Interdisciplinary Center of Materials Science, Martin Luther University Halle-Wittenberg, 4 Heinrich-Damerow Str., D-01620 Halle, Germany
Hartmut S. Leipner
Affiliation:
Interdisciplinary Center of Materials Science, Martin Luther University Halle-Wittenberg, 4 Heinrich-Damerow Str., D-01620 Halle, Germany
Peter Werner
Affiliation:
Max Planck Institute of Microstructure Physics, 2 Weinberg, Halle, D-06120, Germany
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Abstract

The selective formation of porous silicon in nanowires is observed in Si/Ge epitaxial layers along Ge layers grown by molecular beam epitaxy on a Si(100) substrate after metal-assisted chemical etching in aqueous HF-H2O2 solution. We assume that Ge layers serve as channels for a hole current out of the semiconductor to sustain the dissolution reaction. The tunnelling of holes through the potential barrier at the semiconductor surface is assumed to be the dominating mechanism of the hole transfer to the electrolyte.

Keywords

porositymolecular beam epitaxy (MBE)scanning transmission electron microscopy (STEM)
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 1408: Symposium BB – Functional Nanowires and Nanotubes , 2012 , mrsf11-1408-bb20-40
Copyright
Copyright © Materials Research Society 2012

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References

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