Contribution to the thermal properties

of b-SnS2 sprayed thin films

 

C. Khélia1*, T. Ben Nasrallah1, M. Amlouk1, S. Belgacem1, F. Saadallah2, N. Yacoubi2

1 Laboratoire de physique de la Matière Condensée, Equipe de Physique des Dispositifs à Semiconducteur,

Faculté des Sciences de Tunis, Campus Universitaire, 2092 Tunis – Tunisia

2 Equipe de Photothermique de Nabeul, Institut Préparatoire aux Etudes d’Ingénieur de Nabeul,

B.P.62, Merazka 8000 Nabeul – Tunisia

* Corresponding author. E-mail: chiraz.khelia@esstt.rnu.tn

Received: 11 March 2006; revised version accepted: 15 February 2007

 

Abstract

     In this work, b-SnS2 thin films have been prepared on glass substrates by the spray pyrolysis technique using an alcohol solution which contains tin chloride (SnCl4) and thiourea (SC(NH2)2) as precursors. The structural study shows that b-SnS2 thin film prepared using optimal experimental conditions : substrate temperature Ts = 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 SnO2. 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 b-SnS2 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 SnO2) have been taken into account. Thus, the assimilation of the film as an effective medium allows us to reach the thermal conductivity of pure b-SnS2 (K = 0.95 Wm-1K-1).

 

Keywords : b-SnS2; Thin film; Spray pyrolysis; Thermal properties.

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