Characteristics of UV sensors using ZnO nanostructures synthesized by galvanostatic electrochemical deposition

Abstract

In this study, we demonstrate the ZnO nanorods (NRs) and nanocombs (NCs) by simple galvanostatic electrochemical deposition process. The ZnO nanostructures act as high ultra-violet (UV) sensing material due to high aspect ratio. The photoluminescence (PL) spectra and time-dependent photo response of the ZnO nanostructures grown on Au/Si has exhibited good optical properties. At room temperature, NCs showed good response with change 8% its resistance, few second's response time and fully recovery. Inversely, in high temperature ZnO NRs indicated better response than NCs with change of 20% of its resistance. The dependence photoresponse on temperature demonstrated clearly how surface-defects affect on UV response of ZnO nanostructures.