Characterization of n and p-type (SnO₂)_x(ZnO)_1-x nanoparticles thin films

¹ Physics Department, Faculty of Science, Sohag University, 82524 Sohag, Egypt
² Physics Department, College of Arts & Science at Nayriya, AL Dammam University, P.O. 31971, KSA

^a e-mail: hazem95@yahoo.com

Received: 3 April 2015
Revised: 26 June 2015
Accepted: 5 August 2015
Published online: 4 September 2015

Abstract

Electron beam evaporation technique was used to deposit (SnO₂)_x(ZnO)_1-x thin films with different concentrations of SnO₂ and ZnO. Optical transmittance (T) and reflectance (R) of the films were measured in the wavelength range 200–2500 nm. It was found that the optical properties of the films are strongly affected by the ratio of Sn content. The optical energy gaps of direct and indirect transition for the films were determined. Values of energy gap were in the range from 3.35 to 4 eV for direct transition, and from 2.53 to 3.43 eV for indirect transition. The electrical resistivity of the films was measured by means of two contact method. Values of electrical resistivity were in the range between 5.06 × 10^-4 and 1.55 × 10² Ω cm depending on the ratio of Sn and Zn ratios. A transformation from n-type to p-type semiconductors was observed.