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Modeling the ternary chalcogenide Na2MoSe4 from first-principles.

Etienne Palos1,2, Armando Reyes-Serrato2,3, Gabriel Alonso-Nuñez2

  • 1Department of Chemistry and Biochemistry, University of California San Diego, La Jolla, CA 92093, United States of America.

Journal of Physics. Condensed Matter : an Institute of Physics Journal
|October 15, 2020
PubMed
Summary

This study theoretically investigates sodium molybdenum selenide (Na2MoSe4), identifying its stable orthorhombic structure. Computations reveal a direct bandgap, making Na2MoSe4 a promising material for optoelectronic applications.

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Area of Science:

  • Materials Science
  • Solid-State Physics
  • Computational Chemistry

Background:

  • Transition metal chalcogenides are crucial for advanced solid-state devices.
  • Alkali-ion transition metal chalcogenides show potential in optoelectronics, photovoltaics, and energy storage.
  • Theoretical studies are vital for predicting properties of novel inorganic compounds.

Purpose of the Study:

  • To theoretically determine the ground state and electronic properties of sodium molybdenum selenide (Na2MoSe4).
  • To identify the most stable crystal structure of Na2MoSe4.
  • To assess the suitability of Na2MoSe4 for optoelectronic applications based on its electronic band structure.

Main Methods:

  • First-principles computations were used to explore hypothetical crystal structures.
  • Thermodynamic analysis was employed to determine the equilibrium crystal structure.
  • Meta-GGA computations with the Tran-Blaha modified Becke-Johnson potential were utilized to model the band structure.

Main Results:

  • The equilibrium structure of Na2MoSe4 was identified as a simple orthorhombic (oP) lattice with space group Pnma.
  • The study predicted a direct bandgap at the Γ point for the oP Na2MoSe4 structure.
  • The calculated bandgap indicates suitability for optoelectronic device applications.

Conclusions:

  • Na2MoSe4 in its oP Pnma structure is thermodynamically stable.
  • The direct bandgap of Na2MoSe4 makes it a promising candidate for optoelectronic applications.
  • This theoretical work provides a basis for further research on similar inorganic and hybrid materials.