Structural phase transition and the related electronic and optical properties of MgZnO nanowires
Department of Physics, University of Science and Technology of China, Heifei, 230026 Anhui, P.R. China
2 Hefei National Laboratory for Physical Sciences at Microscale, University of Science and Technology of China, Hefei, 230026 Anhui, P.R. China
Corresponding author: a email@example.com
Revised: 7 January 2011
Published online: 16 March 2011
We theoretically investigate the stabilities and electronic structures of MgZnO nanowires with different compositions of Mg. It is found that with increasing composition of Mg, wurzite MgZnO nanowires become less stable, and cubic MgZnO nanowires are energetically favored. The phase transition from wurzite to cubic structure occurs, when the composition of Mg in the MgxZn1-xO nanowire reaches about 0.65. Furthermore, our calculations show that the band gaps can be effectively modulated by composition of Mg for either wurzite or cubic nanowires. This is reflected in the calculated absorption spectra, where the absorption edges shift with variation of the compositions of Mg.
© EDP Sciences, Società Italiana di Fisica, Springer-Verlag, 2011