Simple Fabrication of Homogeneous ZnO Core/Shell Nanorod Arrays for Ultraviolet Photodetectors.

A simple technique of two-step growth was employed to fabricate homogeneous ZnO core/shell nanorod arrays which were composed of ZnO nanodisk shell layer on the surface of ZnO nanorod arrays. The ultraviolet (UV) response characteristics of the device were measured. The homogeneous ZnO core/shell photodetector had remarkably enhanced response and recovery speed compared with pure ZnO nanorod arrays. It indicated that surface homogeneous coating can be an alternative method to enhance the response and recovery properties of the ZnO nanorod array photodetectors.