Structural, Optical and Electrical Properties of Nano-structured Sn-doped ZnO Thin Film via Sol Gel Spin Coating Technique

Abstract

In this work, the Sn-doped ZnO thin films were prepared by Sol gel Spin coating technique on glass substrates at different concentrations of Sn 0, 0.5, 1.5, 1, 2.0 and 3 at.%. The surface morphology reveals that the average particle size of nano-structured Sn-doped ZnO thin films become smaller as the Sn concentrations increased as well as decreasing of average roughness. The optical band gaps were increased, while the resistivity of Sn-doped ZnO thin films were decreased when the Sn concentrations increased. The films doped with 2 at.% exhibited the best properties of average transmittance; RMS average roughness and resistivity were 96 %, 1.850 nm and 7.7 × 102 Ω cm, respectively.