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Synthesis and Characterization of Silver Selenide Thin Films by Chemical Bath Deposition and Ionic Exchange

  • E. Fernández-DíazEmail author
  • A. B. Espinoza-Martinez
  • A. Flores-Pacheco
  • R. Ramírez-Bon
  • S. J. Castillo
  • R. Ochoa-Landin
Article
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Abstract

In this work, Ag2Se thin films were synthetized by a two-step technique at standard laboratory conditions. In the first step a silver hydrogen oxide carbonate thin film matrix was obtained by the chemical bath deposition technique. In the second step an ionic exchange between the matrix film and a new selenium ion solution was performed. The presence of silver and selenium atoms was detected by energy dispersive x-ray spectroscopy. From x-ray diffraction characterization, it was concluded there was an orthorhombic and polycrystalline structure for this material, Ag2Se. On the other hand, it was confirmed by transmission electron microscopy. The binding energies of silver and selenium were detected by x-ray photoelectron spectroscopy. From the ultraviolet–visible absorption spectra for the nanostructured Ag2Se thin film it was observed there was a blue shift in its bandgap, being 1.37 eV, meanwhile the reported bulk bandgap value is 0.15 eV.

Keywords

Thin films chalcogenide synthesis technique silver selenide 

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Notes

Acknowledgments

The authors wish to thank the Physics Postgraduate Program in the Department of Research in Physics in the University of Sonora as well as the CONACYT’s program #297819 that strengthen the scientific and human endeavour of the authors. We gratefully acknowledge the use of TEM facilities at the TEM laboratory of Universidad de Sonora. Also, we thank L.E. Fernandez-King for his valuable contributions in the discussion of the chemical synthesis.

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Copyright information

© The Minerals, Metals & Materials Society 2019

Authors and Affiliations

  1. 1.Departamento de Investigación en FísicaUniversidad de SonoraHermosilloMexico
  2. 2.Laboratorio de Física del Instituto Tecnológico de HermosilloHermosilloMexico
  3. 3.Centro de Investigación en Química Aplicada. BlvdSaltilloMexico
  4. 4.Posgrado en Nanotecnología, Departamento de FísicaUniversidad de SonoraHermosilloMexico
  5. 5.Departamento de Física, Universidad de SonoraHermosilloMexico
  6. 6.Centro de Investigación y Estudios Avanzados, IPNQuerétaroMexico

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