Effect of concentration on the crystallographic and FTIR properties of lead sulphide (PbS) thin films

Qasim A. Adeniji; Taiwo O. Roy-Layinde; Dasola B. Adeniji; Temitope O. Fowodu; Ayobamidele D. Adelaja; Abdulganiu D. Adeniji; Muhammad A. Salihu; Oludele Adegboyega; Kola Odunaike

doi:10.61298/pnspsc.2026.3.339

Authors

Qasim A. Adeniji [email protected] Crystal Growth Research Group, Federal University of Health Sciences, Ila-Orangun, Nigeria
Taiwo O. Roy-Layinde Department of Physics, Olabisi Onabanjo University, Ago-Iwoye, Nigeria
Dasola B. Adeniji Department of Physics, Olabisi Onabanjo University, Ago-Iwoye, Nigeria
Temitope O. Fowodu Department of Physics, Tai Solarin Federal University of Education, Ijebu-Ode, Nigeria
Ayobamidele D. Adelaja Department of Physics, Tai Solarin Federal University of Education, Ijebu-Ode, Nigeria
Abdulganiu D. Adeniji Department of Physics, Olabisi Onabanjo University, Ago-Iwoye, Nigeria
Muhammad A. Salihu Department of Physics, Sule Lamido University, Kafin Hausa, Jigawa, Nigeria
Oludele Adegboyega Department of Physics, Emmanuel Alayande University of Education, Oyo, Nigeria
Kola Odunaike Department of Physics, Olabisi Onabanjo University, Ago-Iwoye, Nigeria

Keywords:

PbS thin film, SILAR cycle, Nanocrystallinity

Abstract

This study reports the use of the successive ionic layer adsorption and reaction (SILAR) technique as a low-cost and rapid method for depositing lead sulphide (PbS) thin films. The films were deposited on soda-lime glass (SLG) substrates by varying the molar concentrations of lead ions (0.3, 0.5, and 0.7 M) at a constant SILAR cycle number of 25. X-ray diffraction (XRD) patterns showed that the deposited PbS thin films were crystalline and had a cubic structure. Fourier-transform infrared (FTIR) spectroscopy indicated nanocrystalline PbS thin films with weak-to-medium M--O bonding. The O--H stretching vibration appeared at 3419.10 cm^-1. Bands at 1338.90 and 1220.10 cm^-1 were associated with improved crystallinity and C--O stretching vibrations. N--H group vibrations were observed at 1686.42 and 1597.87 cm^-1, whereas CH₂ bending vibrations occurred between 1482.79 and 1441.44 cm^-1.

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