Surface passivation optimization using DIRECT

  • Authors:
  • Peter A. Graf;Kwiseon Kim;Wesley B. Jones;Lin-Wang Wang

  • Affiliations:
  • National Renewable Energy Laboratory (NREL), Golden, CO 80401, United States;National Renewable Energy Laboratory (NREL), Golden, CO 80401, United States;National Renewable Energy Laboratory (NREL), Golden, CO 80401, United States;Computational Research Division, Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA 94720, United States

  • Venue:
  • Journal of Computational Physics
  • Year:
  • 2007

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Abstract

We describe a systematic and efficient method of determining pseudo-atom positions and potentials for use in nanostructure calculations based on bulk empirical pseudopotentials (EPMs). Given a bulk EPM for binary semiconductor X, we produce parameters for pseudo-atoms necessary to passivate a nanostructure of X in preparation for quantum mechanical electronic structure calculations. These passivants are based on the quality of the wave functions of a set of small test structures that include the passivants. Our method is based on the global optimization method DIRECT. It enables and/or streamlines surface passivation for empirical pseudopotential calculations.