“…For example, the pre-synthesized SnO 2 quantum dots directed growth on titania show slow charge transfer, low active-sensitizer loading and poor uniformity control for deposition on high aspect-ratio TiO 2 nanostructures ( Wang et al, 2022 ). Doping titania with either inorganic or metallic species can generate donor or acceptor states in the band gap of TiO 2 and impurity states that enhance visible-light adsorption ( Albornoz et al, 2021 ; Wu et al, 2022 ). Non-etheless, metal oxides with doping heterostructure often suffered from thermal instability, fast recombination rates, or the requirement of an expensive ion-implantation facility for more elaborate control, and even showed much larger formation energy due to the substitution of large-radius metal ions ( Singh et al, 2021 ; Liu et al, 2022 ).…”