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Abstract

Thin films of pure tin mono-sulfide SnS and tin mono-sulfide for (1,2,3,4)% fluorine SnS:F with Thicknesses of (0.85 ±0.05) μm and (0.45±0.05) μm respectively were prepared by chemical spray pyrolysis technique. the effectofdopingof F onstructural and optical properties has been studied. X-Ray diffraction analysis showed that thepreparedfilmswere polycrystalline with orthorhombic structure. It was found that doping increasedthe intensity of diffraction peaks. Optical properties of all samples were studied by recording the absorption and transmission spectrum in range of wave lengths (300-900) nm. Theopticalenergygap for direct forbidden transition and indirect allowed transition wereevaluatedIt is found that for doping less than 2% the optical energy gap increases as the percentage of doping increases in the sampleswhilefordoping more than 2% the values of the optical energy gap decreases as the percentage of doping increases.

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