Morphological and Optical Properties of Different Mg Percentage of ZnO/Mg Thin Films Prepared by Sol-gel Spin-coating and Immersion Method

摘要

We have successfully demonstrated ZnO/Mg thin films on Mg seeded-template by using sol-gel spin-coating and immersion technique. By increasing weight percentage of Mg, zinc particles become agglomerate and displayed flower formed as displayed in FESEM characterization. It was observed that the morphology of the zinc particles on Mg seeded-template change from inconsistently distribution for 1 and 3% into cluster flower-like of zinc particles for 5 and 7% weight percentage of Mg. The optical properties of the ZnO/Mg thin films were examined by UV-Vis spectroscopy and the Tauc plot methods was used to estimate the optical band gap. The study reveals that, 7% weight percentage of Mg was recorded as the highest transmittance which is more than 60% in visible wavelength compared to others. With the rise weight percentage of Mg, the transmittance of the thin films was increased except for 5%. This gradually downgraded to below 60% of transmission most probably due to the grain size that becomes bigger. The optical band gap can be tuned by using different Mg percentage to the ZnO/Mg thin films.