Chemical Deposition of CdS Films from Aqueous Solution Containing Triethanolamine

Authors M.A. Sozanskyi , P.Yo. Shapoval , T.B. Hnativ, R.R. Guminilovych , V.E. Stadnik , M.M. Laruk

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

Issue Volume 15, Year 2023, Number 2
Dates Received 05 February 2023; revised manuscript received 15 April 2023; published online 27 April 2023
Citation M.A. Sozanskyi, P.Yo. Shapoval, T.B. Hnativ, et al., J. Nano- Electron. Phys. 15 No 2, 02009 (2023)
PACS Number(s) 81.15.Lm, 78.66.Hf,, 61.05.cp
Keywords Semiconductor films, Cadmium sulfide, Chemical deposition (3) , XRD (84) , Optical band gap (7) .

Cadmium sulfide (CdS) films were obtained on glass substrates via two chemical deposition methods: in the aqueous bath (chemical bath deposition) and directly on the substrate surface (chemical surface deposition). The aqueous solutions of cadmium chloride, thiourea and triethanolamine were used to prepare working solutions. The theoretical calculations of boundary conditions for the formation of cadmium sulfide and cadmium hydroxide were made in the cadmium-triethanolamine-thiourea system. The phase composition, surface morphology and optical transmission spectra of deposited CdS films were investigated. The X-ray diffraction analysis showed that the obtained films were single-phase and contained the CdS compound in its typical cubic modification (ZnS structural type). The film's surface was sufficiently homogeneous, solid and smooth and contained a small amount of fine precipitate particles. The elemental analysis showed the almost stoichiometric molar ratio of cadmium and sulfur in films. The optical transmission of CdS films increases with increasing wavelengths in the measured area from 340 to 900 nm. There are bends on the transmission curves in the 450-500 nm region, which is characteristic for the cadmium sulfide compound. The values of optical band gaps of CdS films were defined to be in the range of 2.41-2.58 eV.

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