Enhancement of Dye Adsorption on TiO2Surface through Hydroxylation Process for Dye-sensitized Solar Cells
Bulletin of the Korean Chemical Society (Print)
To enhance the power conversion efficiency of dye-sensitized solar cell (DSSC), the surface of titanium dioxide (TiO 2 ) photoelectrode was modified by hydroxylation treatment with NH 4 OH solution at 70 ºC for 6 h. The NH 4 OH solutions of various concentrations were used to introduce the hydroxyl groups on TiO 2 surface. As the concentration of NH 4 OH was increased, the short-circuit current density (J SC ) value and conversion efficiency of solar cells were increased because the amount of
... use the amount of adsorbed dye molecules on TiO 2 surface was increased. As a result of the surface modification to introduce hydroxyl groups, the concentration of adsorbed dye on the TiO 2 surface could be improved up to 32.61% without the changes of morphology, surface area and pore volume of particles. The morphology, the specific surface area, the pore volume and the chemical states of TiO 2 surface were characterized by using FE-SEM, N 2 adsorption-desorption isotherms and XPS measurements. The amount of adsorbed dye and the performance of fabricated cells were analyzed by using UV-Vis absorption spectroscopy and solar simulator.