Use of cadmium selenide thin films as a carbon dioxide gas sensor

Abstract

Abstract Cadmium Selenide (CdSe) thin films were prepared in different growth conditions by thermal evaporation. The films were characterised using transmission electron microscopy and X‐ray diffraction. The electrical parameters such as resistivity, carrier mobility, and concentration were determined. The sensitivity of carbon dioxide (CO 2 ) gas on CdSe thin films were studied. A tentative mechanism was proposed, in which the role of CO 2 gas in increasing the conductivity of CdSe thin films were explained by Molecular Orbital (MO) theory. CO 2 gas sensing alarm system was fabricated.