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Spectroscopic Ellipsometry and Band Structure of Si1–yCy Alloys Grown Pseudomorphically on Si (001)

Published online by Cambridge University Press:  15 February 2011

Stefan Zollner ,
Craig M. Herzinger ,
John A. Woollam ,
Subramanian S. Lyer ,
Adrian P. Powell  and
Karl Eberl
Stefan Zollner
Affiliation:
Department of Physics and Astronomy and Ames Laboratory (US-DOE), Iowa State University, Ames, IA 50011-3020
Craig M. Herzinger
Affiliation:
Center for Microelectronic and Optical Materials Research and Department of Electrical Engineering, University of Nebraska-Lincoln, Lincoln, NE 68588-0511
John A. Woollam
Affiliation:
Center for Microelectronic and Optical Materials Research and Department of Electrical Engineering, University of Nebraska-Lincoln, Lincoln, NE 68588-0511, and J. A. Woollam Co., Inc., 650 J Street, Suite 39, Lincoln, NE 68508
Subramanian S. Lyer
Affiliation:
International Business Machines Corporation, Research Division, T. J. Watson Research Center, P. o. Box 218, Yorktown Heights, NY 10598
Adrian P. Powell
Affiliation:
International Business Machines Corporation, Research Division, T. J. Watson Research Center, P. o. Box 218, Yorktown Heights, NY 10598
Karl Eberl
Affiliation:
International Business Machines Corporation, Research Division, T. J. Watson Research Center, P. o. Box 218, Yorktown Heights, NY 10598
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Abstract

We have measured the dielectric functions of three Si1−yCy, alloys layers (y ≤1.4%) grown pseudomorphically on Si (001) substrates using molecular beam epitaxy at low temperatures. From the numerical derivatives of the measured spectra, we determine the critical point energies E′0 and E1 as a function of y (y ≤ 1.4%) using a comparison with analytical line shapes and analyze these energies in terms of the expected shifts and splittings due to negative hydrostatic pressure, shear stress, and alloying. Our data agree well with the calculated shifts for El, but the E′0 energies are lower than expected. We discuss our results in comparison with recent tight-binding molecular dynamics simulations by Demkov and Sankey (Phys. Rev. B 48, 2207, 1993) prediciting a total breakdown of the virtual-crystal approximation for such alloys.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 379: Symposium C – Strained Layer Epitaxy–Materials, Processing, and Devise Applications , 1995 , 205
Copyright
Copyright © Materials Research Society 1995

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References

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