| 초록 |
Dye-sensitized sollar cells (DSSCs) using solid state polymer electrolyte have several advantages such as no solvent leakage and evaporation. Effects of cations on photovoltaic performance have been rather well understood for liquid state DSSCs, but not for solid state DSSCs. In this study, we found that cations (Li+, Na+, K+, PMI+ and HMI+) in polymer electrolytes affected the bulk ionic conduction and interfacial phenomena. Therefore, photovoltaic performances of DSSCs were changed depending on the cation species. The quasi-Fermi level of devices and the electron lifetime were measured by the charge extraction method and the intensity modulated photovoltage spectroscopy (IMVS), respectively. And the electrochemical impedance spectroscopy (EIS) was also used to study interfacial behavior. References [1] B. O’Regan and M. Gratzel, Nature, 353 (1991) 737. [2] M. S. Kang, J. H. Kim, J. Won, Y. J. Kim, N. K. Park and Y. S. Kang, Chemical Communications, (2005) 889. |
