Chemical Deposition of Multilayer HgS Films

Authors M.A. Sozanskyi , K.M. Siryk, P.Yo. Shapoval , R.R. Huminilovych , V.E. Stadnik, M.M. Laruk
Affiliations

Lviv Polytechnic National University, 12, S. Bandera Str., 79013 Lviv, Ukraine

Е-mail martyn.a.sozanskyi@lpnu.ua
Issue Volume 15, Year 2023, Number 6
Dates Received 05 October 2023; revised manuscript received 18 December 2023; published online 27 December 2023
Citation M.A. Sozanskyi , K.M. Siryk, P.Yo. Shapoval, et al., J. Nano- Electron. Phys. 15 No 6, 06010 (2023)
DOI https://doi.org/10.21272/jnep.15(6).06010
PACS Number(s) 81.15.Lm, 78.66.Hf, 68.55.ag, 61.05.cp
Keywords Mercury sulfide, Semiconductor films, Chemical deposition (3) , Optical properties (22) , XRD (95) .
Annotation

The 1-5-layer mercury sulfide (HgS) films were obtained on glass substrates by a chemical bath deposition method. The aqueous solutions of mercury (II) nitrate, thiourea and trisodium citrate were used to prepare working solutions. The theoretical boundary conditions of forming water-insoluble mercury sulfide and mercury oxide in the mercury-thiourea-citrate system were considered. The phase composition, surface morphology and optical properties of the 1-5-layer HgS films were investigated. According to the X-ray analysis, the film samples of deposited 1-5 layers were single phase and consisted of the HgS compound in trigonal (cinnabar) modification. The crystallite sizes of the 1-5-layer HgS films were calculated, and they are in the range of 11.0-33.3 nm, respectively. The films surface was solid and homogeneous and had a small amount of fine precipitate particles, which increased somewhat with each newly deposited HgS layer. The optical transmission spectra of obtained multilayer films were measured in the wavelength area from 340 to 900 nm. The HgS films transmission rises with the increase of wavelength with bends or sharper rises in the region of 350-500 nm, which is typical for films of semiconductor compounds. In addition, the spectral curves shift downward with an increase in the number of layers as the multilayer HgS film samples transmit less light with each newly deposited HgS layer. The optical bandgap values of the 1-5-layer HgS films were determined. The bandgap decreases from 2.86 eV (1-layer HgS film) to 1.78 eV (5-layer HgS film).

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