Influence of calcium doping on structural, morphological and optical properties of chemically deposited PbS films

• Published in: Journal of alloys and compounds Vol. 766; pp. 402 - 409
• Main Authors: Maskaeva, L.N., Markov, V.F., Mostovshchikova, E.V., Voronin, V.I., Pozdin, A.V., Santra, Sougata
• Format: Journal Article
• Language: English
• Published: Lausanne Elsevier B.V 25.10.2018; Elsevier BV
• Subjects: Calcium; Calcium chloride; Calcium-doping; Chemical bath deposition; Crystal structure; Diffraction; Dispersion; Doping; Energy dispersive X ray spectroscopy; Glass substrates; Lead sulfides; Optical band gap; Optical properties; Organic chemistry; PbS thin films; Photoconductors; Scanning electron microscopy; Scientific imaging; Thin films; X-ray diffraction; Photoconductors; PbS thin films; Optical band gap; Chemical bath deposition; Calcium-doping
• ISSN: 0925-8388; 1873-4669
• DOI: 10.1016/j.jallcom.2018.06.263

The calcium-doped PbS films are produced by using the chemical bath deposition method (CBD) on glass and sitall substrates. The influence of the calcium doping on the structural, morphological and optical properties of these films is studied by X-ray diffraction (XRD), scanning electron microscopy (SEM), optical spectroscopy, and energy dispersive X-ray spectroscopy (EDX). The lead sulfide films have cubic structure (B1). The inclusion of calcium in the crystal structure of PbS up to 0.11 at. % is confirmed by the elemental, radiographic and energy-dispersive analyzes. The band gap Eg in the undoped PbS film is estimated as 0.40 ± 0.01 eV at 295 K and 0.38 ± 0.01 eV at 90 K and decreases with calcium doping by ∼0.02 eV. It is shown that doping of lead sulfide films with calcium by adding CaCl2 up to 5.0 mmol/l results in the increase in the photoresponse to IR radiation in 1.7 times. •PbS films doped with Ca up to 0.11 at. % are deposited on sitall and glass.•Increase in lattice parameter of cubic structure of B1 is revealed.•Optical band gap is Eg ∼0.40 eV in PbS film and 0.38 eV in Ca doped film.•Photoresponse to IR radiation in Ca doped PbS film increases in 1.7 times.