Effect of Annealing in the Molybdenum Diselenide Formation of using Electrochemical Deposition Method

Mo-Se thin films have been electrodeposited on conducting tin oxide (SnO2) coated glass substrates from basic and acidic solution containing Na2MoO4 and H2SeO3. The Mo-Se films obtained in different electrolytes were analyzed for their composition. It was found that the chemical composition of the Mo-Se films depends on the Na2MoO4/H2SeO3 ratio in the electrolyte. Also the time of electrodeposition optimized. In this work the influence of pH value and the concentration of precursor and influence of annealing temperature on the electrochemical property of the MoSe2 were investigated. Some unreacted MoO2 was detected and also some excess elemental Se was also removed, but were removed by thermal annealing. X-ray diffraction analysis showed the presence of a highly textured MoSe2 film and polycrystalline nature. SEM studies shows that the unheated films are uniform and pin-hole free. As the temperature rises, the pin-hole increase on the surface.