Fig. 1. Top view of the 2 × 2 × 1 supercell of Tl-doped h-WO₃

Fig. 2. Energy band structure and DOS of pure h-WO₃: (a) Energy band structure; (b) TDOS of h-WO3; (c) PDOS of W; (d) PDOS of O1; (e) PDOS of O2

Fig. 3. Energy band structure and DOS of Tl_0.33WO₃: (a) Energy band structure; (b) TDOS of Tl_0.33WO₃; (c) PDOS of Tl; (d) PDOS of W; (d) PDOS of O1; (e) PDOS of O2

Fig. 4. Optical performance of h-WO₃ and Tl_0.33WO₃: (a) Imaginary part of the dielectric function; (b) reflectivity; (c) absorption spectrum

Fig. 5. Theoretical transmittance of h-WO₃ and Tl_0.33WO₃ films: (a) The compacted film; (b) the coated film