| 초록 |
Tungsten oxide (WO3) has attracted much attention for photoanode since it has long hole diffusion length and great photo-stability. However, WO3 suffers from high bandgap and poor surface kinetics. One strategy to surmount limitations is to form a heterojunction with another metal oxide, which can broaden absorption range of light and manipulate the charge kinetics. Among various metal oxides for photoanodes, hematite (α-Fe2O3) is promising due to the small band gap comparing to WO3, and moderately lower position of conduction band which can impede the electron transfer to WO3. However, the heterojunction interface between WO3 and α-Fe2O3 has not yet been studied thoroughly, while it can largely affect the charge kinetics moving through both metal oxides. Herein, we controlled the heterojunction interface between WO3 and α-Fe2O3 by growth-facet engineering with flame-treated WO3. The absorption and charge kinetics were thoroughly studied by experiments and density functional theory. |
