Titanium dioxide(TiO_2) loaded tungsten trioxide(WO_3) composite films are prepared by an E-beam vapor system. Associated with the existence of a heterojunction at the interface of TiO_2 and WO_3, the prepared TiO_2-W...Titanium dioxide(TiO_2) loaded tungsten trioxide(WO_3) composite films are prepared by an E-beam vapor system. Associated with the existence of a heterojunction at the interface of TiO_2 and WO_3, the prepared TiO_2-WO_3 composite film shows enhanced photocurrent density; four times than the pure WO_3 film illuminated under xenon lamp, and higher incident-photon-to-current conversion efficiency. By varying the initial TiO_2 film thickness, such composite structures could be optimized to obtain the highest photocurrent density. We believe that thin TiO_2 films improve the light response and increase the surface roughness of WO_3 films. Furthermore,the existence of the heterojunction results in the efficient charge carriers' separation, transfer process, and a lower recombination of electron-hole pairs, which is beneficial for the enhancement of photocurrent density.展开更多
基金Supported by the National Natural Science Foundation of China under Grant Nos 11174137,11474215 and 21204058the Natural Science Foundation for the Youth of Jiangsu Province under Grant No BK20130284the Priority Academic Program Development of Jiangsu Higher Education Institutions
文摘Titanium dioxide(TiO_2) loaded tungsten trioxide(WO_3) composite films are prepared by an E-beam vapor system. Associated with the existence of a heterojunction at the interface of TiO_2 and WO_3, the prepared TiO_2-WO_3 composite film shows enhanced photocurrent density; four times than the pure WO_3 film illuminated under xenon lamp, and higher incident-photon-to-current conversion efficiency. By varying the initial TiO_2 film thickness, such composite structures could be optimized to obtain the highest photocurrent density. We believe that thin TiO_2 films improve the light response and increase the surface roughness of WO_3 films. Furthermore,the existence of the heterojunction results in the efficient charge carriers' separation, transfer process, and a lower recombination of electron-hole pairs, which is beneficial for the enhancement of photocurrent density.
