DEPOSITION AND GROWTH WITH DESORPTION IN MOLECULAR-BEAM EPITAXY

We investigate a model for epitaxial film growth by particle depositio n that takes into account the diffusion, aggregation and possible evap oration of the particles deposited on the surface. We find that partic le evaporation can dramatically affect the growth velocity of the film , as it is experimentally observed for (0 0 1) CdTe. Puzzling features of these experiments are given a simple explanation. A model for CdTe growth is presented, and quantitative agreement is found with experim ental data. Our results are obtained by extensive computer simulations as well as through a simple analytic scaling approach. (C) 1998 Elsev ier Science B.V. All rights reserved.