Characterization of tin disulfide thin films prepared by spin coating technique: effect of spin speed and deposition time on film properties
By: Kazi, Hanium Maria
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Contributor(s): Kabir, Rezaul Md.
Publisher: USA Springer 2023Edition: Vol.104(4), Aug.Description: 1011-1021p.Subject(s): Humanities and Applied SciencesOnline resources: Click here
In:
Journal of the institution of engineers (India): Series BSummary: Thin films of SnS2 were synthesized by spin coating technique at room temperature using an aqueous solution of stannic chloride and thioacetamide as the absorber layer in solar cells. The films were deposited at different spin speeds and spin times, and their effect on the properties of the thin films was studied. The spin speed was varied from 1000 to 2000 rpm, and the spin time was from 60 to 120 s for each speed. The structure of the films was found to be face-centered cubic with preferential orientation along the (002) plane; there was no sign of other unwanted phases. With increasing spin speeds and deposition times, the crystallinity of the sample was improved for a certain speed; after that, it deteriorated crystallinity. FTIR peaks confirmed the presence of Sn–S bonds in all the prepared films. Morphological results of the films were consisting of small spherical grains in an aggregated form that is abated by spin speed. EDAX revealed that the thin film was found near stoichiometric and some excess amount of tin was present in the sample. Atomic force microscopy (AFM) showed the presence of grains, hills, and valleys on the surfaces of thin films. XPS results confirmed the presence of Sn and S in the deposited films. The band gap values for the films deposited at 1500 rpm for 90 s calculated from the absorbance spectra increased from 2.9 to 3.5 eV with an increase in deposition time attributed to a change in film thickness.
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Thin films of SnS2 were synthesized by spin coating technique at room temperature using an aqueous solution of stannic chloride and thioacetamide as the absorber layer in solar cells. The films were deposited at different spin speeds and spin times, and their effect on the properties of the thin films was studied. The spin speed was varied from 1000 to 2000 rpm, and the spin time was from 60 to 120 s for each speed. The structure of the films was found to be face-centered cubic with preferential orientation along the (002) plane; there was no sign of other unwanted phases. With increasing spin speeds and deposition times, the crystallinity of the sample was improved for a certain speed; after that, it deteriorated crystallinity. FTIR peaks confirmed the presence of Sn–S bonds in all the prepared films. Morphological results of the films were consisting of small spherical grains in an aggregated form that is abated by spin speed. EDAX revealed that the thin film was found near stoichiometric and some excess amount of tin was present in the sample. Atomic force microscopy (AFM) showed the presence of grains, hills, and valleys on the surfaces of thin films. XPS results confirmed the presence of Sn and S in the deposited films. The band gap values for the films deposited at 1500 rpm for 90 s calculated from the absorbance spectra increased from 2.9 to 3.5 eV with an increase in deposition time attributed to a change in film thickness.
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