Effect of post-annealing on structural and electrochromic properties of Mo-doped V2O5 thin films

The effect of post-annealing on the structural and electrochromic properties of the Mo-doped V2O5 thin films was investigated in this paper. With varying the annealing temperature, the interlayer distance is increased from 1.16 (as-deposited) to 1.38 nm (annealing at 250 °C), and the enlarged interlayer spacing would facilitate ion movement in between the interlayers inside the electrochromic matrix. Therefore, both the optical modulation and color efficiency of the Mo-doped V2O5 thin films are enhanced after appropriate post-annealing treatment. Our results demonstrate that Mo-doped V2O5 material is one of the promising candidates to be used in multi-color electrochromic devices. The ability to modulate optical transmittance of the Mo-doped V2O5 thin films is greatly enhanced by means of the larger interlayer distance after annealing.