Structural properties and photoluminescence of ZnO nanowalls prepared by two-stepgrowth with oxygen-plasma-assisted molecular beam epitaxy

Abstract

Low dimensional (nanowall) ZnO structures were prepared by a two-step growthmethod with oxygen-plasma-assisted molecular beam epitaxy, where the as-grownfilm was first engraved on a porous template using the oxygen plasma and thenthe ZnO nanowalls were grown on the template. The resonance Raman spectrashowed the surface mode. A morphology model was proposed on the basis of thescanning electron microscopy patterns and this mode. The room and low temperaturephotoluminescence showed that the nanowalls had intense ultraviolet emissionproperties, which benefited from the low dimensional structure with few defects.