Surface, Step-Edge, and Facet-Edge Diffusion Barriers in Growth of Pb Nanomesas

ORAL

Abstract

To obtain a better understanding of the growth kinetics of faceted Pb mesas on Si(111) surface, we perform extensive calculations of diffusion barriers for a Pb adatom (1) on a flat Pb(111) surface, (2) crossing a single A- or B-step edge on the Pb(111) surface, and (3) crossing the joint edge of the Pb(111) and (001) facet, using a modified embedded atom method. We have investigated different diffusion mechanisms mediated by vacancies and concerted displacements of multiple atoms. A quantitative comparison will be made between the calculated results and recent experiments. *This work is supported by NSF.

Authors

  • Yong Han

  • Feng Liu

    • Univesity of Utah
    • Department of Material Science and Engineering, University of Utah, Salt Lake City, UT 84112
    • Univesity of utah
    • University of Utah

  • Guang-Hong Lu

    • Department of Material Science and Engineering, University of Utah, Salt Lake City, UT 84112

  • Byeong-Joo Lee

    • Department of Material Science and Engineering, Pohang University of Science and Technology, Pohang 790-784, Republic of Korea