Novel structure, morphology, and optical property of Mg-doped ZnO nanostructures fabricated by PCVD method

Abstract

Mg-doped ZnO nanostructures with different growth temperature and Mg contents have been successfully fabricated on Si (111) substrates via physical chemical vapor deposition (PCVD) method. The influences of the growth temperature and Mg contents on the nanostructure, morphologies, and crystallinities were characterized by scanning electron microscopy (SEM), X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), and photoluminescence (PL) spectra. The SEM results show that it is beneficial to grow regular ZnMgO nanorods with the growth temperature of 750 °C and Zn/Mg molar ratio of 50:1, respectively. XRD results indicate that the nanorods possess the preferential orientation along the c-axis with the best crystals. The nanorod arrays, dendritic, and like-caltrop nanostructure were achieved at various growth temperature and Mg contents, respectively. The photoluminescence (PL) spectra show that the UV emissions present the obvious blueshift owing to the increasing growth temperature and Mg contents.