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The Formation of Self-Assembled Nanowire Arrays on Ge(001): a DFT Study of Pt Induced Nanowire Arrays

Published online by Cambridge University Press:  31 January 2011

Danny Eric Paul Vanpoucke  and
Geert Brocks
Danny Eric Paul Vanpoucke
Affiliation:
[email protected], University of Twente, Faculty of Science and Technology, Computational Materials Science, Enschede, Overijsel, Netherlands
Geert Brocks
Affiliation:
[email protected], University of Twente, Faculty of Science and Technology, Computational Materials Science, Enschede, Overijsel, Netherlands
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Abstract

Nanowire (NW) arrays form spontaneously after high temperature annealing of a sub monolayer deposition of Pt on a Ge(001) surface. These NWs are a single atom wide, with a length limited only by the underlying beta-terrace to which they are uniquely connected. Using ab-initio density functional theory (DFT) calculations we study possible geometries of the NWs and substrate. Direct comparison to experiment is made via calculated scanning tunneling microscope (STM) images. Based on these images, geometries for the beta-terrace and the NWs are identified, and a formation path for the nanowires as function of increasing local Pt density is presented. We show the beta-terrace to be a dimer row surface reconstruction with a checkerboard pattern of Ge-Ge and Pt-Ge dimers. Most remarkably, comparison of calculated to experimental STM images shows the NWs to consist of germanium atoms embedded in the Pt-lined troughs of the underlying surface, contrary to what was assumed previously in experiments.

Keywords

self-assemblysimulationscanning tunneling microscopy (STM)
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 1177: Symposium Z – Computational Nanoscience–How to Exploit Synergy between Predictive Simulations and Experiment , 2009 , 1177-Z03-09
Copyright
Copyright © Materials Research Society 2009

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