In this work, Ag 2 Se 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, Ag 2 Se. 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 Ag 2 Se 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.
Bibliographical notePublisher Copyright:
© 2019, The Minerals, Metals & Materials Society.
- Thin films
- silver selenide
- synthesis technique