Abstract
CdTe buffer layers are widely used as substrate materials for the molecular beam epitaxial (MBE) growth of Hg 1-x Cd x Te because of the small lattice mismatch. With the help of a scanning tunneling microscope (STM) and a scanning electron microscope (SEM) the surface topographies of epitaxial CdTe layers grown under different conditions were studied quantitatively. It was found that photoassistance during growth enhances the formation of pyramidal hills with a typical height of 1000 A. The use of an excess of Cd completely changes the surface morphology towards 2-dimensional growth and the remaining layer roughness was less than 50 A. These initial results suggest that the Cd rich conditions provide a promising method for the growth of large, flat layers
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