The present work is devoted to the electrochemical deposition of thin CoSe films and study of the influence of various factors on the composition of the resulting film. It was established that during the deposition of both individual components and in their joint presence, the electroreduction potentials (Se, Co and CoSe) are respectively equal to 0.35, -0.2, 0.23 V. Anodic dissolution of CoSe is observed at a potential of 0.75 V. The electrochemical reduction of selenium and cobalt occurs in 2 stages. The results demonstrated that both the temperature and the electrode material have a significant effect on the kinetics of CoSe electrodeposition. At temperatures above 60⁰C, the quality of the resulting films deteriorates. High-quality crystalline films with high adhesion surface are obtained in the temperature range of 25–60⁰ C. Pt, Ni were taken as a cathode material and Pt served as the anode. The optimal electrolyte composition and electrolysis mode for obtaining thin CoSe films close to the stoichiometric composition were also determined. 0.01 M H₂SeO₃, 0.1 М CoCl₂, 100 ml H₂O, i=0.2-0.4 mА/sm², Т=25–60⁰С, Cathode - Pt, Ni. anode Pt

doi.org/10.32737/0005-2531-2023-4-120-127