| 초록 |
Dye sensitized solar cell (DSSC) based on liquid electrolyte contains problems such as evaporation, leakage, sealing, etc. Hence, the efforts have been made to replace the liquid electrolyte with different solid electrolytes. Ionic liquid (IL) within polymer electrolytes is an attractive candidate for replacement. Here we used a low viscosity ionic liquid, 1-ethyl 3-methylimidazolium thiocyanate in order to modify ionic conductivity (σ) of polymer electrolyte (PEO:KI) and hence DSSC efficiency. The doping of KI and addition of IL enhanced the σ. The maximum σ was 8.86 x 10-4 S/cm at 80 wt% of IL concentration. Beyond this it was harder to get stable films. The efficiency of solar cell having configuration of TiO2/PEO:KI/I2/CE showed an efficiency 1.04% while the solar cell with TiO2/PEO:KI/I2 + 80 wt% IL/CE showed 1.23% efficiency at 100 mW/cm2 light intensity. |
