Structural and electronic properties of SnO₂ doped with non-metal elements

Area of Science:

• Materials Science
• Solid State Physics
• Computational Chemistry

Background:

• Tin dioxide (SnO₂) is a wide-bandgap semiconductor with applications in electronics and optoelectronics.
• Modifying SnO₂ properties through doping is crucial for advanced material design.

Purpose of the Study:

• Investigate the effects of non-metal doping (F, S, C, B, N) on SnO₂'s crystal structure, electronic, and optical properties.
• Identify the optimal dopant for enhancing SnO₂'s photoelectric performance for specific applications.

Main Methods:

• First-principles calculations were employed to simulate and analyze doped SnO₂.
• Evaluated changes in lattice volume, defect binding energy, bandgap, Fermi level, and optical properties.

Main Results:

• Non-metal doping caused slight lattice expansion but did not alter the SnO₂ crystal structure.
• Fluorine (F) doping resulted in the lowest defect binding energy.
• Boron (B) and Sulfur (S) doping introduced defect energy levels, improving conductivity.
• Fluorine-doped SnO₂ exhibited metallicity with its Fermi level within the conduction band.
• F-doped SnO₂ showed the highest infrared reflectivity, indicating superior photoelectric properties.

Conclusions:

• Non-metal doping significantly modifies the electronic and optical characteristics of SnO₂.
• Fluorine-doped SnO₂ is identified as the most promising material for low-emissivity coatings due to its excellent photoelectric properties.