Structural, Optical and Electrical Properties of Multiple Layers Nano-Structured Zinc Oxide Thin Film

摘要

The Nano-Structured ZnO thin films were prepared by Spin coating technique on glass substrates at various layers. The structural and optical properties were characterized by field emission scanning electron microscopy (FESEM) and UV-Vis-NIR respectively. The surface morphology reveals that the nano-structured ZnO thin films become densely packed as the thickness increased. The average particles size of ZnO thin film estimated from FESEM images at different layers of 1, 3, 5, 7, 9 were 20nm, 28nm, 36nm, 39nm and 56nm, respectively. The surface roughness of thin films was increase as the thin film thickness increases. The results show all films are transparent in the visible region (400-800 nm) with average transmittance above 85%. Meanwhile, the optical band gap was decrease as the film thickness increases. The conductivity of ZnO thin film slightly improved as the thickness increased as measured through two probes 1-V measurement system.