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Effects of Nanocrystalline Structure and Passivation on the Photoluminescent Properties of Porous Silicon Carbide

Published online by Cambridge University Press:  15 February 2011

Jonathan E. Spanier ,
G. S. Cargill III ,
Irving P. Herman ,
Sangsig Kim ,
David R. Goldstein ,
Anthony D. Kurtz  and
Ben Z. Weiss
Jonathan E. Spanier
Affiliation:
School of Engineering and Applied Science, Columbia University, New York, NY 10027
G. S. Cargill III
Affiliation:
School of Engineering and Applied Science, Columbia University, New York, NY 10027
Irving P. Herman
Affiliation:
School of Engineering and Applied Science, Columbia University, New York, NY 10027
Sangsig Kim*
Affiliation:
School of Engineering and Applied Science, Columbia University, New York, NY 10027
David R. Goldstein
Affiliation:
Kulite Semiconductor Products, Inc., Leonia, NJ 07605
Anthony D. Kurtz
Affiliation:
Kulite Semiconductor Products, Inc., Leonia, NJ 07605
Ben Z. Weiss
Affiliation:
The Technion, Israel Institute of Technology, Department of Materials Engineering, Haifa, Israel 32000
*
2 current address: University of Illinois, Department of Electrical Engineering, Microelectronics Lab, Urbana, IL 61801.
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Abstract

We present the results of an investigation of the dependence of the photoluminescence (PL) spectra on preparation conditions, the resulting microstructure, and post-anodization treatment of porous silicon carbide films which were formed from both p and n-type 6H-SiC substrates. Porous samples were prepared by anodic dissolution under different galvanostatic conditions, resulting in different porosities and crystallite sizes. Selected-area electron diffraction patterns taken on similarly prepared porous silicon carbide (PSC) samples confirmed that the films were monocrystalline. Transmission electron microscopy of as-anodized films revealed an isotropie porous network; a dependence of porosity and nanocrystallite size on porous layer formation current density was established. Some PSC samples were passivated using a short, thermal oxidation treatment. The effects of porosity and crystallite size, and of oxide passivation in these PSC films, on PL spectra and intensity were studied using a 365 nm Kr-ion laser as excitation. Under certain conditions, the spectrally integrated PL intensity of a passivated film is more than 450x that for the original bulk SiC substrate. PL spectra are presented, and possible mechanisms are discussed.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 452 , 1996 , 491
Copyright
Copyright © Materials Research Society 1997

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Footnotes

1

also with Kulite Semiconductor Products, Inc.

References

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