Abstract
Polycrystalline films of PbS:Fe are obtained via hydrochemical deposition from an ammonia-citrate bath containing 10−5 to 7 × 10−3 M of FeCl2 doping additive. The films’ morphology is studied along with their structural and optical properties. An increase in the lattice parameter of PbS doped up to 5 × 10‒3 M testifies to the interstitial position of Fe2+ ions, while a subsequent reduction in the lattice parameter is due to some of the lead ions in the PbS crystal lattice being replaced with iron ions of a smaller radius. Doping with iron ions produces impurity absorption bands in the optical absorption spectra of PbS:Fe films. Rearrangement of the zone structure of lead sulfide near the edge of the band gap is observed in a film obtained from a solution containing 5 × 10−3 M FeCl2. The change in the zone structure is due to the lead ions in the PbS lattice being replaced with iron ions.
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Funding
This work was performed as part of RF Government Program 211, project no. 02.A03.21.0006; and by the Mikheev Institute of Metal Physics as part of State Task no. AAAA-A18-118020190112-8 (topic “Stream”) from the Russian Federal Agency for Scientific Organizations. It was supported by the Russian Foundation for Basic Research, project no. 18-29-11051. Our optical studies were performed as part of State Task no. AAAA-A18-118020290104-2 (topic “Spin”) from the Russian Federal Agency for Scientific Organizations for the Mikheev Institute of Metal Physics.
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Vaganova, I.V., Mostovshchikova, E.V., Voronin, V.I. et al. Evolution of the Structural and Optical Properties of PbS Films upon Doping with Iron(II). Russ. J. Phys. Chem. 94, 2428–2434 (2020). https://doi.org/10.1134/S0036024420120304
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DOI: https://doi.org/10.1134/S0036024420120304