Funct. Mater. 2020; 27 (2): 396-402.
Hydrochemical synthesis of Cd1-xCoxS films
Institute of Chemistry and Chemical Technologies, Lviv Polytechnic National University, 12 Bandery Str., 79013 Lviv, Ukraine
The Cd1-xCoxS films solid solutions are obtained by a hydrochemical synthesis method. The initial concentration of Cd-containing salt in the working solution was 0.04 mol/L and that of Co-containing salt varied from 0.01 to 0.08 mol/L. The phase and elemental composition, optical properties and surface morphology of Cd1-xCoxS films were studied. It is found that the obtained coatings consist of amorphous and cubic (zinc blende) phases. The results of optical measurements of the solid solutions films show the presence of jumps or bends of light transmission in the wavelength range of 450-550 nm. The determined values of optical band gaps of the Cd1-xCoxS films are 1.51-2.48 eV, depending on the synthesis conditions. As a result of the study of elemental composition, it was found that the cadmium content in the films is the highest at the beginning of synthesis and decreases with increasing of deposition duration. The cobalt content in the coatings is, in reverse, the lowest at the beginning of deposition and increases during synthesis. The largest changes in the atomic composition of Cd1-xCoxS films occur for the first 20 min of synthesis, and for further 25-60 minutes the changes are minor. At the end of synthesis, the obtained films have the following compositions: Cd42.1Co7.1S50.8, Cd35.4Co13.1S51.5, Cd20.8Co26.8S52.4, Cd12.4Co33.0S54.6, and Cd9.1Co43.9S47.0 (at initial concentrations of Co-containing salt of 0.01; 0.02; 0.04; 0.06; and 0.08 mol/L, respectively). Their surface is homogeneous with the inclusions of insignificant amount of irregular or spherical shape particles.
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