| 초록 |
An ionic liquid was solidified with an organic hole-transporting triphenylamine compound, and then applied as a redox mediator to hybrid solar cells(HSCs). A HSC with the solidified ionic liquid showed a power conversion efficiency(PCE) of 1.80% with the short-circuit current(Jsc) of 4.61mA/cm2, the open-circuit voltage(Voc) of 0.544V and the fill factor(FF) of 71.81%. In addition, by incorporating 4-tert-butyl pyridine as an additive into the solidified ionic liquid, the PCE of the HSC was sharply increased by 4.20 % (Jsc=9.43mA/cm2, Voc=0.610V, and FF=73.03%), due to improvements in all photovoltaic parameters, and the ion diffusion resistance was considerably decreased. These results were ascribed to the plasticizer effect of the bulky-structured 4-tert-butyl pyridine. |
