Structural, thermal, vibrational, and optical characterization of Sn–S–Se dichalcogenide system synthesized by high-energy ball milling

Miécio de Oliveira Melquiades, Leonardo Soares de Oliveira, Ranilson Angelo da Silva, Sérgio Michielon de Souza, Marcelo Ornaghi Orlandi*

*Corresponding author for this work

Research output: Contribution to journalJournal articleResearchpeer-review

Abstract

Layered tin-based SnS2, Sn(S0.5Se0.5)2, and SnSe2 dichalcogenide semiconductors were synthesized using high-energy ball milling. Structural analyses revealed anisotropic nanostructures with the 2H-polytype. The extended milling time produced nanocrystallites due to the high density of defects and texture indexes. A significant microstrain reduction was achieved by replacing the 1d site with heavier chalcogenides. The presence of microstrained nanocrystallites widens and redshifts the A1g and Eg Raman modes. The redshift effect also occurs when the lattice parameters are increased via doping. The overall exothermic DSC profile exhibited a subtle modification above 450 °C suggestive of SnO2 nucleation. A composition-dependent exciton redshift in UV–Vis was followed by a reduction in the band gap toward lower averaged ionic radii in the 1d site. Multiple straight-line segments in Tauc plots indicate sub-bands as a result of the multilayered structure.

Original languageEnglish
Article number110203
JournalJournal of Physics and Chemistry of Solids
Volume157
Number of pages8
ISSN0022-3697
DOIs
Publication statusPublished - 2021

Keywords

  • Differential scanning calorimetry
  • High energy ball milling
  • Raman spectroscopy
  • Tin dichalcogenides
  • UV–Vis
  • X-ray diffraction

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