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Optical properties of lead sulfide films obtained by chemical bath deposition from static and ultrasonic baths

V. POPESCU1,2,* , G. L. POPESCU2

Affiliation

  1. National Institute for Research and Development in Microtechnologies, IMT – Bucharest, Romania
  2. Technical University of Cluj-Napoca, Romania

Abstract

Lead sulphide is a narrow band semiconductor (0.41 eV at 300 K), studied for applications related to NIR radiation detection, infrared solar cells or sensors. PbS films, consisting in one and two layers, have been obtained from solutions containing lead acetate and thiourea in alkaline environment from static and ultrasonic baths. The effect of ultrasounds and the number of deposited layers on the formation and on the optical properties of the PbS has been studied. Both films consisting in one or two layers were thinner when the deposition took place under ultrasonic agitation when the films were formed from the same number of layers and the ultrasounds were applied only 10 minutes at the beginning of the reaction. Ultrasounds lead to the detachment of the particles from the substrate, reducing the deposition rate. Optical properties were measured for UV-VIS wave lengths and the band gaps have been calculated.

Keywords

Lead sulphide, Thin films, Chemical bath deposition, Sonochemical.

Submitted at: March 10, 2011
Accepted at: July 25, 2011

Citation

V. POPESCU, G. L. POPESCU, Optical properties of lead sulfide films obtained by chemical bath deposition from static and ultrasonic baths, Journal of Optoelectronics and Advanced Materials Vol. 13, Iss. 7, pp. 926-932 (2011)