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    COLLOQUIUM OF THE LABORATORY FOR COMPUTER DESIGN OF MATERIALS
        Institute for Computational Sciences and Informatics
	                      CSI 898-Sec 001  
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           FACETING AND PLANARIZATION IN SILICON SURFACES

                         Steven C. Erwin 
               Naval Research Laboratory, Washington, DC

The microscopic morphology of a clean semiconductor surface is a
complicated function of its crystallographic orientation. Certain
orientations give rise to thermodynamically stable planar surfaces,
while other orientations lead to sawtooth faceted surfaces.  The
morphology of a surface with adsorbates is further complicated by the
additional variables of adsorbate species and coverage. Moreover,
surface orientations that are faceted in the clean state may become
"planarized" when adsorbates bind to the substrate.  These phenomena
are illustrated by three examples from our recent theoretical and
experimental work: Si(114), Si(5,5,12), and Ga/Si(112).

	               Monday , September 22 1997
                                 4:30 pm
                        Room 206, Science & Tech. I

Refreshments will be served.
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(http://www.csi.gmu.edu/lcdm/seminar/schedule.html)