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Optical properties of PbS-CdS multilayers and mixed (CdS+PbS) thin films deposited on glass substrate by spray pyrolysis

V. POPESCU1,* , H. I. NAŞCU1, E. DARVASI2

Affiliation

  1. Technical University of Cluj-Napoca, Muncii Boulevard, nr. 103-105, RO-400641, Cluj-Napoca Romania
  2. Babeş-Bolyai University, 11Arany Janos, RO-400028, Cluj-Napoca Romania

Abstract

Two kinds of films containing both PbS and CdS were obtained by spray pyrolysis. The first one, sandwich type, consisting on 2-6 layers, was obtained trough the successive deposition of CdS at 450 oC, and PbS at 400-425 oC, from solutions containing either Pb(Ac)2 or CdCl2 and thiourea. The second one, mixed (CdS+PbS) was obtained from solutions containing both Cd and Pb salts, having a molar ratio Cd:Pb from 5:1 to 1:5.3, and thiourea, depositing 1-5 layers, at 300-350 °C. The transmission for sandwich type was of 15.5-23.8 % for neutral light, and 20 - 23 % for green light, respectively, as a function of the deposition conditions. For mixed (CdS+PbS) films the transmission for neutral light was of 6-45 %. For all layers the deposition time was 10 seconds, and the flow rate of the solution 20-25 ml/minute. VIS transmission spectra were recorded for the obtained films. The transmission was intermediate between that obtained for PbS or CdS films deposited separately. The color parameters in the CIELAB color space have been calculated based on the obtained spectral data. For two of CdS+PbS layers NIR reflection spectra were also recorded. NIR reflection is lower than the reflection of PbS or CdS deposited separately. The film characteristics depend on the concentration and the molar ratio of cadmium and lead salts and on the number of deposited layers..

Keywords

Cadmium sulfide, Lead sulfide, Thin films, Optical properties, Spray pyrolysis.

Submitted at: March 23, 2006
Accepted at: May 18, 2006

Citation

V. POPESCU, H. I. NAŞCU, E. DARVASI, Optical properties of PbS-CdS multilayers and mixed (CdS+PbS) thin films deposited on glass substrate by spray pyrolysis, Journal of Optoelectronics and Advanced Materials Vol. 8, Iss. 3, pp. 1187-1193 (2006)