Study of Shifted UV Emission Peak of ZnO Nanowire Arrays

Abstract

We have obtained vertically aligned ZnO nanowire arrays synthesized by microwave-assisted heating method with different growth time. From the room-temperature PL measurement, the strong deep-level emission and weak near band edge (NBE) emission can be seen. The deep-level emissions became weaker and deep-level emissions became stronger when the samples were annealed at 300 °C for 30 min, meanwhile, the NBE emission peaks get red-shifted with growth time, and the longer the growth time, the more the peak shifting. This phenomenon can be attributed that the diameter of ZnO nanowires increases with growth time. This PL emission phenomenon is important in research of optoelectronic application.

Keywords

ZnO nanowire arrays / photoluminescence property / red shift / different growth time

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