Structural and optical properties of high magnesium content wurtzite-Zn1−xMgxO nanowires

Abstract

Wurtzite Zn1−xMgxO nanowires (NWs) are grown using metalorganic chemical vapor deposition technique with the highest Mg mole fraction of 0.29. The physical structure of the NWs remains invariant with increasing Mg incorporation while the diameters and lengths vary in the range 40–180 nm and 0.5–1.5 μm, respectively. Room temperature photoluminescence shows near band edge emission associated with free exciton emission that shifts to shorter wavelength with an increase in the Mg mole fraction. Hall measurement shows that electron mobility decreases with increasing Mg concentration. Revised elastic constants are suggested to explain the observed decrease in the lattice volume at a low Mg mole fraction.