The European Physical Journal Applied Physics

Thin Films

p-Type transparent conducting copper-strontium oxide thin films for optoelectronic devices

H.A. Mohamed 

Physics Department, Faculty of Science, Sohag University, 82524 Sohag, Egypt

Physics Department, Teachers College, King Saud University, 11148 Riyadh, Kingdom of Saudi Arabia


p-Type thin films of copper-strontium oxide (Cu-Sr-O) have been deposited by e-beam evaporation technique on microscopic glass substrates. A study of optical, electrical and structural properties was performed on the thin films, varying temperature of annealing. Amorphous Cu-Sr-O films were obtained at low temperature. Partially polycrystalline films were obtained at high temperature of 550 °C with transparency over 72% at wavelength from 600 to 700 nm in the visible region and 83% in the near infrared region (λ = 1800:2500 nm). The optical band gap was estimated to be ~3.5 eV. The Seebeck coefficient measurements showed that the as-deposited films represented n-type conduction and with annealing temperature these films converted to p-type. The electrical conductivity measurements at room temperature of annealed films at temperature of 550 °C represented the best value about 2 S/cm. The other optical parameters such as refractive index, extinction coefficient, dielectric constant and cutoff wavelength were studied as a function of annealing temperature.

(Received November 20 2010)

(Revised March 02 2011)

(Accepted August 01 2011)

(Online publication November 14 2011)