Density Functional Based Tight Binding Study on Wurzite ZnS Nanowires

Authors

  • Le Thi Hong Lien Institute of Engineering Physics, Hanoi University of Technology
  • Vu Ngoc Tuoc Institute of Engineering Physics, Hanoi University of Technology
  • Nguyen Thi Thuong Institute of Engineering Physics, Hanoi University of Technology

DOI:

https://doi.org/10.15625/0868-3166/22/4/2663

Keywords:

Wurtzite Nanowire, Density functional based tight binding simulation

Abstract

We present a semi-abinitio - Density Functional Based Tight Binding (DFTB) study on the atomic and electronic structure of ZnS Nanowire (NW) and examine the dependence of surface stress on nanowire lateral size and shape. The ZnS wurtzite wire size ranges from 10 to 45Å and of various possible shapes - triangular, hexagonal and circular-like. We investigate the role of unsaturated dangling bond state in the region of band gap varying the wire's diameter. We have calculated the surface formation energy and find that it decreases with increasing the wire diameter and a greater stability (lower surface formation energy) comes with hexagonal and circular-like depending on wire's diameter. Other electronics and mechanical properties e.g. density of states (DOS), Young modulus...  also are found to depend on the wire's size and shape. Futher the wire passivation by hydrogen has also investigated.

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Published

10-01-2013

How to Cite

Lien, L. T. H., Tuoc, V. N., & Thuong, N. T. (2013). Density Functional Based Tight Binding Study on Wurzite ZnS Nanowires. Communications in Physics, 22(4), 317. https://doi.org/10.15625/0868-3166/22/4/2663

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Section

Papers