Abstract
This study aims to determine the extent to which sulphur can be replaced with selenium in the Sb2S3 matrix. The relevance of this work is that this replacement reaction forms the underlying principle for the formation of the ternary compound AgSbSe2 from the binary compound Sb2S3. AgSbSe2 is a compound semiconductor belonging to the I-V-VI2 group that has applications in photovoltaics. Even though there are numerous reports of heating multilayers of Sb2S3/Ag/Se or Sb2S3/Ag2Se/Ag to produce AgSbSe2, none of them have resulted in a pure ternary phase. This study explores the possibilities and limitations of the replacement of sulphur with selenium in antimony sulphide thin film. In this work, selenium is deposited on Sb2S3 layer and the resulting structure is annealed at 200°C. The replacement reaction was found to be incomplete at this temperature. The temperature of annealing could not be increased any further as the elemental selenium could not withstand higher temperatures. Hence, a protective layer of silver was coated on top of the selenium layer, and the temperature of annealing was increased to higher values. X-ray diffraction, scanning electron microscopy-energy dispersive X-ray and X-ray photoelectron spectroscopy were used to characterize the multilayer film.
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Acknowledgements
We acknowledge the financial support provided by UGC through the minor project 1600-MRP/14-15/KLCA021/UGC-SWRO to carry out this study. We also acknowledge DST-FIST (grant number SR/FST/College-237/2014(C)) for providing financial support for developing the laboratory facilities for carrying out the research. We express sincere gratitude to Dr Sadasivan Shaji and Dr Bindu K, Facultad de Ingeniería Mecánica y Eléctrica, Universidad Autónoma de Nuevo León, Mexico, for helping with X-ray photoelectron spectroscopy analysis. Acknowledgement is also extended to STIC, CUSAT, Cochin, for the analytical facilities SEM, EDS and XRD.
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Kuruvilla, A., Francis, M., Sudheer, K.S. et al. Replacement of sulphur with selenium in antimony sulphide thin films. Bull Mater Sci 45, 66 (2022). https://doi.org/10.1007/s12034-021-02651-8
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DOI: https://doi.org/10.1007/s12034-021-02651-8