In this work, a study is made on the optoelectronic properties of thin MoOX films, with 2 < x < 3. To do this, thin MoOX films were grown with approximate thicknesses of 10, 15 and 20nm by sputtering, which were deposited on glass, and Si-n / p wafers with the aim of subjecting them to different characterization techniques. It is observed that the obtained MoOx films can form a p-n junction if deposited on a Si-n wafer or behave as a hole-extracting layer if deposited on Si-p and the above-mentioned properties shown a substantial improvement after a thermal treatment at 200°C in high vacuum for 30 minutes.