Development of a High Performance SnO, SnO/TMC Nanostructures Thin Film Prepared by Spray Pyrolysis Technique

Author Elekwa, C. A.
Co-Author Agbo, P.E., Idu, H.K
DOI 10.17605/O

Country : Nigeria
Subject : Industrial Physics

Keywords : Tin Oxide (SnO), Transistion Metal Chalcogenides (TMC), (SnO/ZnS), transmittance, absorbance, reflectance, refractive index(n), band gap (Eg) , Spray pyrolysis technique and XRD.

Abstract

Thin films of the form: SnO, SnO/TMC were prepared using the spray pyrolysis technique at different substrate temperatures The films were characterized to investigate the effect of varying substrate temperatures on the optical and structural lproperties using UV-spectrophotometer and X-ray diffraction technique. The result showed that the optical transmittance decreased with increase in substrate temperature for SnO (core).The absorbance of the SnO thin films at various substrate temperatures vary from 0.10 – 0.7.For the biphasic films of SnO/ZnS, the absorbance decreases in the neighbourhood of 300nm-350nm, increases from350nm-600nm and decreases between 600-100nm for the different substrate temperature of 100o C, 150o C and 200o C.The reflectance spectra of SnO films were found fluctuating between maxima and minima while in the biphasic films the reflectance is low. The energy band gap increased with substrate temperature. Whereas for the biphasic films, the band gap was in the neighourhood of 1.30eV,1.20eV and 1.10eV for the different substrate temperatures respectively. The extinction coefficient (k) of SnO films increased with increase in substrate temperature while in biphasic films, the extinction coefficient showed significant reduction in magnitude irrespective of the substrate temperature. The refractive index of the film samples is generally low despite the substrate temperature. The XRD results indicated that the deposited thin films are polycrystalline in nature. The diffractograms obtained for biphasic films of SnO/Zns are characterized by relatively low intensity for all the samples irrespective of the substrate temperatures when compared to the uncoated SnO samples. The possible applications were discussed and these agree with the experimental data obtained.

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