| 초록 |
Oligomeric supramolecules containing multiple (double (2H-P), triple (3H-P), and quadruple (4H-P)) hydrogen bonding sites at both chain ends of the PEG oligomers were utilized to improve the energy conversion efficiency for solid state dye-sensitized solar cells. The improved efficiency was primarily due to the better interfacial contact by deeper penetration of the oligomeric supramolecules into the nanopores of the TiO2 layer and also to the increased ionic conductivity. The electron life time and ionic diffusion coefficient were measured to characterize the difference among three supramolecular electrolytes. As a result, 2H-P and 3H-P showed faster ionic diffusion and longer life times than 4H-P. Therefore, the solid state 2H-P and 3H-P electrolytes resulted in the high energy conversion efficiencies over 4.5% at 1 sun condition (AM 1.5 and 100mW cm-2). |
