Synthesis of cadmium sulfide thin films from an aqueous solution containing sodium citrate

2019 Voprosy himii i himičeskoj tehnologii  
The cadmium sulfide (CdS) films were prepared on glass substrates by chemical bath deposition method using aqueous solutions of cadmium chloride, thiourea, sodium citrate (complexing agent) and ammonia (pH regulator). A theoretical calculation of the boundary conditions of the formation of cadmium sulfide and cadmium hydroxide in the citrateammonia system was performed in this work. The composition, structure, optics and morphology of the synthesized CdS semiconductor films were experimentally
more » ... ere experimentally investigated. The obtained films are two-phase and consist of CdS in both sphalerite and wurtzite modifications. They have a homogeneous solid surface, a practically stoichiometric composition and a narrow interval of the change of optical band gap. The quantumchemical modeling of possible chemism of the CdS synthesis was performed. According to the results of the calculation, cadmium sulfide is formed from the initial cadmium citrate complex via the formation of several intermediate complexes. An analysis of the obtained experimental results allows finding the relationship between the deposition conditions and properties of the prepared semiconductor films, revealing the advantages of the use of sodium citrate as a complexing agent and determining the expediency of its application.
doi:10.32434/0321-4095-2019-123-2-39-46 fatcat:5t6fzp7dv5d55gc6jzdsxuvjtu