L204
Solidification of the Liquid Electrolyte in Dye-sensitized TiO2 Solar Cells
Shozo Yanagida
Osaka University
The solidification of the hole-transporting liquid electrolyte solution of I-/I3- in the dye-sensitized TiO2 solar cells has attracted much attention in view of the long-term stabilization of the cell modules. Some attempts to solidify the liquid hole-transporting phase using gelators or using amorphous hole-transport materials will be disclosed. Recently, Hanafusa and Shirai reported that some amino acid derivatives having long alkyl and phenyl groups worked as gelators for organic electrolyte solution, and that the resulting organo gels had the comparable electrochemical properties of the fluid organic electrolyte solution. The quasi-solidification of the liquid electrolyte using such low-molecular weight gelators gave the respectable AM1.5 efficiencies which were comparable with that of the wet-type module. The solidification by photodepositing polypyrrole as a solid electrolyte led to the AM1.5 efficiency of less than 1%. The efficiency and stability of the quasi-solid state solar cells will be discussed.
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