Effect of Al, Ti and Cr Doping on Vanadium Dioxide (VO2) Analyzed by Density Function Theory (DFT) Method

Area of Science:

• Materials Science
• Condensed Matter Physics
• Computational Chemistry

Background:

• Vanadium dioxide (VO₂) exhibits thermochromic properties crucial for energy-saving applications.
• Understanding doping effects is key to tailoring VO₂'s electronic and optical characteristics.
• Computational methods offer atomic-scale insights into material modifications.

Purpose of the Study:

• To investigate the fundamental doping effects of Al, Ti, and Cr on VO₂.
• To analyze the impact of metal substitution on VO₂'s electronic structure, band gap, and optical properties.
• To provide insights for designing novel metal oxide nanocomposites for thermochromic applications.

Main Methods:

• Density Functional Theory (DFT) calculations were employed.
• Simulations focused on the substitution doping of Al, Ti, and Cr in monoclinic VO₂ (VO₂(M)).
• Analysis included electronic structure, band gap shifts, and optical reflectivity.

Main Results:

• Al doping slightly distorted the VO₂(M) octahedron and narrowed the band gap via valence band shift.
• Cr doping narrowed the band gap through conduction band shift.
• Ti doping slightly widened the band gap of VO₂(M).
• Substitution with low-valent metals like Al decreased optical reflectivity.

Conclusions:

• DFT provides atomic-level understanding of doping effects on VO₂.
• Elemental doping significantly modifies VO₂'s electronic and optical properties.
• This research aids in designing VO₂-based nanocomposites for enhanced thermochromic energy saving.