TiO2 Band Restructuring by B and P Dopants.

Area of Science:

• Materials Science
• Solid State Physics
• Computational Chemistry

Background:

• Titanium dioxide (TiO2) is a crucial photocatalyst.
• Understanding doping effects on TiO2 electronic structure is key for enhanced applications.
• Previous studies focused on various dopants, but B and P effects require further elucidation.

Purpose of the Study:

• To investigate the impact of Boron (B) and Phosphorus (P) doping and codoping on the electronic structure of anatase TiO2.
• To elucidate the mechanisms behind doping-induced changes in TiO2.
• To provide insights for designing efficient TiO2-based catalysts.

Main Methods:

• Density Functional Theory (DFT) calculations were employed.
• Simulations focused on the electronic structure of doped anatase TiO2.
• Analysis of local bond relaxation, core electron entrapment, and band structure modifications.

Main Results:

• B- or P-doping mimics atomic undercoordination, causing local bond relaxation and core electron entrapment.
• Entrapped charges create impurity levels within the band gap, enhancing visible-light absorption and prolonging carrier lifetime.
• Doping reduces the work function and band gap by polarizing nonbonding electrons, boosting carrier reactivity and visible-light utilization.

Conclusions:

• B- and P-doping effectively modify the electronic structure of TiO2.
• Doping-induced changes promote visible-light absorption and enhance photocatalytic potential.
• Findings offer a pathway for rational design and synthesis of advanced TiO2 catalysts.