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CONTRIBUTION TO THE THERMAL PROPERTIES OF β-SNS2 SPRAYED THIN FILMS

In this work, β-SnS 2 thin films have been prepared on glass substrates by the spray pyrolysis technique using an alcohol solution which contains tin chloride (SnCl 4 ) and thiourea (SC(NH 2 ) 2 ) as precursors. The structural study shows that β-SnS 2 thin film prepared using optimal experimental conditions: substrate temperature T s = 280 °C and the concentration ratio of sulfur and tin elements in the spray solution x = [S]/[Sn] = 2.5, crystallizes in the hexagonal phase with a strong (001) X-ray diffraction line. In the same way, microprobe analysis (EPMA) as well as X-ray photoelectron spectroscopy (XPS) show the presence of undiserable phase of SnO 2 . From the transmission and reflectance spectra, the band gap energy is 2.65 eV. On the other hand, the photothermal properties of such films have been studied. Indeed, the analysis of β-SnS 2 thin films via the photodeflection spectroscopy including the effect of the inhomogeneity at the surface (roughness) and in the bulk (air inclusion, secondary phase of SnO 2 ) have been taken into account. Thus, the assimilation of the film as an effective medium allows us to reach the thermal conductivity of pure β-SnS 2 (K = 0.95 Wm -1 K -1 ).