STUDY ON THE STRUCTURAL AND OPTICAL PROPERTIES ON THE EFFECT OF DEPOSITION TIME ON THE ZnO NANORODS GROWN ON POROUS SILICON SUBSTRATE

Abstract

In this study, we investigated the structural and optical properties of ZnO Oxide (ZnO) Nanorods grown on Porous Silicon (PSi) substrate at different deposition time. By using sol-gel immersed method that contained zinc nitrate hexahydrate (Zn(NO₃)₂.6h₂O) and hexamethenamine (C₆H₁₂N₄) the ZnO Nanorods on PSi was synthesized. A homogenous and stable solution was prepared by dissolving the Zn(NO₃)₂.6h₂O in a solution of DI water and hexamethenamine. The molar ratio of nitrate solution and hexamethenamine is 1:1. The structural properties of the samples were characterized using Scanning Electron Microscope (SEM) and X-ray Diffraction (XRD) and photoluminescence (PL) for optical properties. The SEM images showed that the nanorods with different aspect ratio were formed through tuning the deposition time when the molar concentration was 0.01 M. From the XRD measurement result, it can be seen that the growth orientation of ZnO Nanorods was [100] and [101]. Photoluminescence (PL) spectra show that the ZnO Nanorods exhibit a strong-violet (UV) emission of 398 nm and several weak emissions in the blue and green bands.