Structural, Optical, and Photosensitive Properties of PbS Films Deposited in the Presence of CaCl2
- Authors: Maskaeva L.N.1,2, Mostovshchikova E.V.3, Markov V.F.1,2, Voronin V.I.3
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Affiliations:
- Ural Federal University named after the First President of Russia B.N. Yeltsin
- Ural Institute of State Fire Service, Ministry of the Russian Federation for Civil Defense, Emergency Management, and Natural Disasters Response
- Mikheev Institute of Metal Physics, Ural Branch, Russian Academy of Sciences
- Issue: Vol 53, No 2 (2019)
- Pages: 165-171
- Section: Surfaces, Interfaces, and Thin Films
- URL: https://journals.rcsi.science/1063-7826/article/view/205669
- DOI: https://doi.org/10.1134/S1063782619020179
- ID: 205669
Cite item
Abstract
Polycrystalline lead-sulfide (PbS) films doped with calcium are synthesized on sitall and glass substrates by chemical bath deposition with the use of thiocarbamide and a CaCl2 additive at concentrations of up to 5 mM. Introduction of the CaCl2 additive into the reaction solution greatly prolongs the induction period of the process of synthesis. The thicknesses of the PbS and PbS(Ca) films are, correspondingly, 200 and 150 nm at an average crystallite dimension of ~100 nm. The maximum calcium content in the films is 0.06 at % for layers on sitall substrates and 0.11 at % for layers on glass substrates. Doping with calcium does not influence the crystal structure of lead sulfide (the cubic B1 structure, space group Fm3\(\bar {m}\)) but brings about an increase in the crystal-lattice period from a = 0.59343(2) nm to a = 0.59413(1) nm, an increase in microstrains, and partial ordering of the crystallites forming the film. Upon the introduction of calcium, the band gap decreases from Eg = 0.40 eV at 295 K (0.38 eV at 90 K) to Eg = 0.38 eV (0.37 eV). The introduction of up to 5 mM of CaCl2 into the reaction mixture increases the voltage–power sensitivity of the films by a factor of ~1.7, which is attributed to oxygen-containing compounds formed in the films as a result of the increase in the induction period of the process of synthesis.
About the authors
L. N. Maskaeva
Ural Federal University named after the First President of Russia B.N. Yeltsin; Ural Institute of State Fire Service, Ministry of the Russian Federation for Civil Defense, Emergency Management, and Natural Disasters Response
Email: mostovsikova@imp.uran.ru
Russian Federation, Yekaterinburg, 620002; Yekaterinburg, 620062
E. V. Mostovshchikova
Mikheev Institute of Metal Physics, Ural Branch, Russian Academy of Sciences
Author for correspondence.
Email: mostovsikova@imp.uran.ru
Russian Federation, Yekaterinburg, 620108
V. F. Markov
Ural Federal University named after the First President of Russia B.N. Yeltsin; Ural Institute of State Fire Service, Ministry of the Russian Federation for Civil Defense, Emergency Management, and Natural Disasters Response
Email: mostovsikova@imp.uran.ru
Russian Federation, Yekaterinburg, 620002; Yekaterinburg, 620062
V. I. Voronin
Mikheev Institute of Metal Physics, Ural Branch, Russian Academy of Sciences
Email: mostovsikova@imp.uran.ru
Russian Federation, Yekaterinburg, 620108