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Electrical Transport in Mesoporous Silicon Layers

Published online by Cambridge University Press:  28 February 2011

M. Ben-Chorin ,
S. Grebner ,
F. Wang ,
R. Schwarz ,
A. Nikolov  and
F. Koch
M. Ben-Chorin
Affiliation:
Physics Department E16, Technical University of Munich, D-85747 Garching, Germany
S. Grebner
Affiliation:
Physics Department E16, Technical University of Munich, D-85747 Garching, Germany
F. Wang
Affiliation:
Physics Department E16, Technical University of Munich, D-85747 Garching, Germany
R. Schwarz
Affiliation:
Physics Department E16, Technical University of Munich, D-85747 Garching, Germany
A. Nikolov
Affiliation:
Physics Department E16, Technical University of Munich, D-85747 Garching, Germany
F. Koch
Affiliation:
Physics Department E16, Technical University of Munich, D-85747 Garching, Germany
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Abstract

In order to clarify the role of the enlarged surface area of porous silicon on the electrical conductivity, we have studied the transport in mesoporous silicon layers, for which quantum confinement effects are negligible. We prepare free standing mesoporous films, from highly doped p-type Si wafers. The dark conductivity of the mesoporous layers is activated with an energy of 0.5 eV. Thermopower measurements show negative sign indicating electron conduction. The exposure of these layers to methanol vapor results in an increased conductivity and change of the thermopower magnitude. Photoconductivity measurements and the Steady-State Photocarrier Grating technique (SSPG) are used to evaluate the density of the surface states and the dynamics of the photo-excited carriers. All these results indicate that a large density of surface states exist, which results in a depletion of the free holes.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 358: Symposium F – Microcrystalline and Nanocrystalline Semiconductors , 1994 , 575
Copyright
Copyright © Materials Research Society 1995

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References

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