Post-deposition thermal treatment of sprayed SnS films
Thin Solid Films(2017)
摘要
SnS films were grown in air by chemical spray pyrolysis method using aqueous solutions containing SnCl2 and SC(NH2)2 at molar ratios of 1:1 and 1:8 and a substrate temperature of 200°C. As-deposited films were thermally treated at 450°C in nitrogen or vacuum atmospheres. All samples were studied using X-ray diffractometry, Raman spectroscopy, energy-dispersive X-ray analysis, and ultraviolet–visible spectroscopy. The as-grown films consisted of cubic SnS as the only crystalline phase regardless of the molar ratio of the precursors in the spray solution. Annealing of the 1:1 films (derived from the 1:1 solution) in vacuum yielded metallic Sn, whereas annealing in N2 produced films composed of a mixture of cubic SnS and SnO2 phases, indicating the presence of oxygen-containing non-crystalline phases in the as-grown films. Thermal treatment of the 1:8 films in nitrogen yielded films composed of Sn2S3, whereas vacuum annealing produced films consisting of orthorhombic SnS with a bandgap energy of 1.4eV.
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关键词
Tin sulfide,Chemical spray pyrolysis,Thermal treatment,X-ray diffraction,Raman spectroscopy
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