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The effect of Pb2+ precursor concentration on the optical and solid state properties of annealed PbSe thin films grown by solution growth method

R. A. CHIKWENZE1,* , M. N. NNABUCHI2

Affiliation

  1. Nwafor Orizu College of Education, Nsugbe, Nigeria
  2. Department of Industrial Physics, Ebonyi State University, Abakikili, Nigeria

Abstract

Lead Selenide (PbSe) thin films were deposited on glass substrates by Chemical Bath Deposition (CBD) method at 60o C. The baths for the films deposition were composed of lead nitrate, the source of the anion, sodium citrate, the enhancing agent, sodium hydroxide, the complexing agent, sodium selenosulphate, the source of the cation and distilled water. All the deposited films were subjected to the same post-deposition annealing of 150o C, in the oven, for 2hours. The structures were investigated using X-ray diffraction and the crystallinity of the films were observed to decrease with increasing Pb2+ precursor concentration. The composition and optical properties were studied using RBS machine 1.7W TANDEM PELLETRON-model 5SDH and optical spectrophotometer respectively. The films deposited at lower Pb2+ precursor concentration have higher absorption coefficient and lower band gap. The range of the band gap of the films was 1.70 – 2.20 ± 0.05 eV. From this band gap and the result of the absorption coefficient of the films, it could be used for absorber layer in the fabrication of solar cell..

Keywords

CBD, PbSe thin films, Optical properties.

Submitted at: Oct. 30, 2010
Accepted at: Nov. 25, 2010

Citation

R. A. CHIKWENZE, M. N. NNABUCHI, The effect of Pb2+ precursor concentration on the optical and solid state properties of annealed PbSe thin films grown by solution growth method, Journal of Optoelectronics and Advanced Materials Vol. 12, Iss. 12, pp. 2363-2368 (2010)