Size-dependent strain effects on electronic and optical properties of ZnO nanowires

Yang, Yurong; Yan, X. H.; Xiao, Yang; Di Lu
July 2010
Applied Physics Letters;7/19/2010, Vol. 97 Issue 3, p033106
Academic Journal
The electronic and optical properties of ZnO nanowires under uniaxial strain are investigated using first-principles calculations. The results show that the electronic band gap for the ultrathin ZnO nanowires displays a nonmonotonic relationship with the strain, while the gap is inversely proportional to strain and shows a linear relationship for the nanowires with diameter larger than 2.4 nm. Optical properties calculations show that the dielectric function peaks for ultrathin nanowires display a redshift with decreasing uniaxial strain, this energy shift decreases with increasing diameter and vanishes as the diameter increases to 2.4 nm.


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