Speaker
Ms
Luleka Menzi
(Unisa)
Description
This study focuses on aluminum doped-zinc oxide (AZO) nanoparticles which have been synthesized using the sol-gel method at room temperature. The gel was a resultant of a zinc acetate dehydrate precursor, absolute ethanol as a solvent, dimethylsulfoxide (DMSO) as a stabilizing ligand and tetramethylammonium hydroxide (TMAH, 25WT%) to initiate ZnO nanoparticle formation. The zinc acetate dehydrate mass was varied from 1g to 6g and the dopant concentration was varied from 1 to 5 mol%. . The products were spin coated onto glass substrates at different spin rotations, from 500rpm to 2500rpm. AZO thin films, showed crystallite size in the range of 2 to 5nm with spherical shape and 2θ = 34.34o corresponding to (002) plane of Hexagonal wurtzite structure of ZnO. Spin coating does not produce uniformly deposited films so the defects are expected to change with the deposition speeds. AZO thin films showed higher transparency greater than 80% in the visible region while the electrical resistivity can be expected to be 10-3 Ωcm. The AZO thin films were further characterized for elemental composition using energy dispersive spectroscopy (EDS). Film thickness, refractive index and dielectric constants were determined using spectroscopic ellipsometer. Hall measurement system was used to measure the sheet resistance, carrier concentration and mobility of AZO thin films.
Level for award<br> (Hons, MSc, <br> PhD, N/A)?
MSc
Main supervisor (name and email)<br>and his / her institution
Prof BM Mothudi mothubm@unisa.ac.za
Apply to be<br> considered for a student <br> award (Yes / No)?
Yes
Would you like to <br> submit a short paper <br> for the Conference <br> Proceedings (Yes / No)?
Yes
Primary author
Ms
Luleka Menzi
(Unisa)
Co-authors
Prof.
Bakang Mothudi
(Unisa)
Ms
Pontsho Mbule
(Unisa)
