| 초록 |
In the dye-sensitized solar cells (DSSCs), many researchers have focused on the role of some coadsorbents to enhance the JSC and VOC, since the coadsorbent plays an important role in organizing and orienting the adsorbed dyes on nanoporous TiO2 films. We reported that the nature of the coadsorbent end-groups anchored to the TiO2 surface strongly influences the interfacial properties of DSSCs. The stearic acid (SA) as coadsorbent, which has a low dipole moment and high solubility, retards the rate of dye adsorption via a competitive anchoring process on the TiO2 layer, thereby increasing the surface concentration of strongly bound dye on the TiO2 surface. As a result, the both short circuit current density and power conversion efficiency was improved, even for much lower coverage of the dye. Herein, the effects of coadsorbents adsorbed with dye on the interfacial phenomena and photovoltaic performance of DSSCs will be discussed. |
