Thermal and optical properties of Cd_2SnO_4 thin films using photoacoustic spectroscopy

摘要

Cadmium stannate (Cd_2SnO_4) thin films were prepared by the RF magnetron sputtering technique on glass substrates with substrate temperatures of room temperature (RT), 100℃, 200℃ and 300℃. Photoacoustic analyses were made to obtain the thermal diffusivity and the optical bandgap values of the Cd_2SnO_4 thin films. The change in thermal diffusivity of the films with the substrate temperature was analyzed. The optical bandgap values obtained from the photoacoustic spectroscopy were compared with the values obtained from the optical trans-mittance spectra. X-ray photoelectron spectroscopic (XPS) studies confirm the formation of stoichiometric films. Surface morphological studies by atomic force microscopy (AFM) revealed the crystalline nature of the films deposited at 100℃.