Synthesis, structural, optical, electrical and thermoluminescence properties of chemically deposited PbS thin films

• Published in: Journal of luminescence 2014-03, Vol.147, p.41-48
• Main Authors: Göde, F., Güneri, E., Emen, F.M., Emir Kafadar, V., Ünlü, S.
• Format: Article
• Language: English
• Subjects: Absorbance; Chemical bath deposition; Coefficients; Condensed matter: electronic structure, electrical, magnetic, and optical properties; Condensed matter: structure, mechanical and thermal properties; Cross-disciplinary physics: materials science; rheology; Deposition; Diffraction; Exact sciences and technology; Liquid phase epitaxy; deposition from liquid phases (melts, solutions, and surface layers on liquids); Materials science; Methods of deposition of films and coatings; film growth and epitaxy; Optical constants: refractive index, complex dielectric constant, absorption, reflection and transmission coefficients, emissivity; Optical properties; Optical properties and condensed-matter spectroscopy and other interactions of matter with particles and radiation; Optical properties of bulk materials and thin films; Other luminescence and radiative recombination; PbS thin films; Physics; Reflectance; Resistivity; Scanning electron microscopy; Structure of solids and liquids; crystallography; Structure of specific crystalline solids; Thermoluminescence; Thin films
• ISSN: 0022-2313; 1872-7883
• DOI: 10.1016/j.jlumin.2013.10.050

PbS thin films with deposition times of 100, 115, 130 and 145min were prepared by chemical bath deposition method at room temperature. Their crystal structures were characterized by X-ray diffraction. All films were polycrystalline with a cubic rock salt structure. The morphological properties of the films were investigated by scanning electron microscopy. The optical properties of the films were studied using the absorbance, transmittance and reflectance spectra. The optical band gap of the films decreased from 2.65eV to 2.50eV with increasing deposition time. The optical parameters of the materials such as refractive index, extinction coefficient and dielectric constants were also determined. The electrical conductivity of the PbS film increased from 1.791×10−6 to 1.655×10−3(Ωcm)−1 with increasing deposition time. Thermoluminescence intensity of the films was measured after irradiating the films with a β source for 15min at room temperature and the kinetic parameters were obtained by using the computer glow curve deconvolution method. •PbS films were deposited on glass substrates by chemical bath deposition.•Effect of deposition time on physical properties of the PbS film was investigated.•Band gap of PbS films decreased from 2.65eV to 2.50eV with deposition time.•Conductivity increased from 1.791×10−6 to 1.655×10−3(Ωcm)−1 with deposition time.•Thermoluminescence properties of PbS films were presented for the first time.