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Crystallite size effect in PbS thin films grown on glass substrates by chemical bath deposition

A. POPA1, M. LISCA1, V. STANCU1,* , M. BUDA1, E. PENTIA1, T. BOTILA1

Affiliation

  1. National Institute R&D of Materials Physics, Bucharest-Magurele, Romania

Abstract

Nanocrystaline PbS thin films were grown on glass substrates using Chemical Bath Deposition (CBD) method. The presence of nanocrystals was revealed by optical absorption and photocurrent measurements. We have compared the absorption threshold between large size and nanocrystalline PbS. Our study was performed in order to demonstrate that the size of the PbS thin films crystalites affects the photoelectric properties of the material. Using the Scanning Electron Microscopy (SEM) we have determined that the grains inside large size PbS crystalites are 300 nm. From the optical absorption measurements we have determined that the size of PbS nanocrystals is between 5-50 nm. The photoconduction measurements show that large size PbS has a maximum in infrared situated at 2.4 µm, and in PbS nanocrystalline thin film this maximum is shifted toward smaler wavelengths towards visible and near infrared..

Keywords

Nanocrystals, PbS films, Excitonic effects.

Submitted at: Oct. 14, 2005
Accepted at: Jan. 26, 2006

Citation

A. POPA, M. LISCA, V. STANCU, M. BUDA, E. PENTIA, T. BOTILA, Crystallite size effect in PbS thin films grown on glass substrates by chemical bath deposition, Journal of Optoelectronics and Advanced Materials Vol. 8, Iss. 1, pp. 43-45 (2006)