| 초록 |
In the dye-sensitized solar cells (DSCs), TiO2 electrodes, sensitized with the N719 dye during the adsorption process, were found to have large fractions of weakly bound N719 on the electrode surface, which resulted in dye aggregation and decreased device longevity. To ameliorate disadvantages, we previously introduced coadsorbents in the system of DSCs. It was revealed that the nature of the coadsorbents such as functional end group, dipole moment, and solubility were the key parameters for the role of coadsorbents, organizing and orienting the adsorbed dyes on the nanoporous TiO2 film. Herein, we investigate that the parameters could have different roles by thermodynamic control for competitive anchoring of dye. Slowing of adsorption, via both thermally and through SA-mediated processes, effectively controlled the binding mode of N719 on the surface of TiO2. The resulting sensitized electrodes displayed enhanced device longevity and improved generation of photoinduced electrons. |
