Net‐patterned fluorine‐doped tin oxide to accelerate the electrochromic and photocatalytic interface reactions

In this study, the surface morphology of net‐patterned fluorine‐doped tin oxide (FTO) films was optimized with mesh sizes (60 mesh, 40 mesh, and 24 mesh) using the one‐pot horizontal ultrasonic spray pyrolysis deposition (HUSPD) process. The 40M‐FTO sample exhibited optimized electrical and optical properties due to the improved crystallinity and net‐patterned surface morphology of FTO. The electrochromic (EC) electrodes fabricated with 40M‐FTO showed superior EC performance, including transmittance modulation (ΔT, 58.7%), switching speeds (4.1 s for coloration and 5.9 s for bleaching), and coloration efficiency (CE, 52.4 cm²/C). These optimum values were attributed to the combined effect of the enhanced electrical properties from the improved crystal-linity of the SnO2 and the high transmittance with a large surface area stemming from the optimization of the net‐patterned FTO surface morphology. Moreover, the improved reaction sites with large surface area and enhanced electrical conductivity can facilitate the photocatalytic reaction. Ac-cordingly, we suggest our novel strategy for use in creating promising transparent conducting electrodes that can be fabricated with net‐patterned FTO to realize enhanced electrochromic and pho-tocatalytic interface reactions.