Enhanced performance of dye-sensitized solar cells based on meso/ macroporous phosphotungstic acid/TiO_2 photoanodes

摘要

A hierarchically meso/macroporous phosphotungstic acid/TiO~(2)(HPW/TiO~(2)) composite has been synthesized and introduced into the photoanode of dye-sensitized solar cells (DSSCs). The performance of the cell with hierarchically HPW/TiO~(2)modified photoanode was enhanced compared to the pristine P25 cell. When the mass percentage of HPW/TiO~(2)is 15 wt% in the photoanode, an increase of 28.2% improvement in the conversion efficiency are obtained. The interfacial layer modified by HPW can retard the recombination of electrons and broad the absorption to the visible region; the introduction of hierarchically porous structure in the photoanode can increase light scattering and dye adsorption. All these merits are responsible for an efficient enhancement in energy conversion efficiency.