OXYGEN INTERACTION OF CDS-BASED GAS SENSORS WITH DIFFERENT STOICHIOMETRIC COMPOSITION

The interaction of oxygen with surfaces of CdS thin films with differe nt stoichiometric compositions was studied by X-ray photoelectron spec troscopy (XPS) and thermal-desorption mass spectroscopy observations c ombined with conductivity measurements. Three different types of film with different atomic ratios of Cd/S were used in the study of oxygen chemisorption in a low-temperature range between 300 and 570 K. Spray pyrolysis was used for the deposition of the films on glass substrates ; XPS and energy dispersive spectroscopy of X-rays together with atomi c force microscopy and scanning electron microscopy were used for the characterization of the composition and structure of the films. It was possible to distinguish different temperature ranges for the thermal desorption of the different adsorbed oxygen species. A comparison of t he data from XPS and mass-spectroscopy observations with conductance m easurements allows to conclude that metallic surface atoms are respons ible for different interactions of oxygen species with CdS surfaces.