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Satoshi Mikoshiba,Shinji Murai,Hiroyasu Sumino,Takashi Kado,Daisuke Kosugi,Shuzi Hayase 한국물리학회 2005 Current Applied Physics Vol.5 No.2
Increases in photovoltaic performances for dye-sensitized solar cells having ionic liquid type electrolytes are reported. These re-sults are explained by diusion coecient for I3. , charge transfer resistances on counter electrodes, at band potentials of TiO2,redox potentials for I. /I3. , electron diusion constants, electron life time, and diusion length in TiO2 layers. Methylpropylimid-azolium iodide is selected because of the lowest viscosity and the highest conductivity. Increases in the photovoltaic performance areobserved when a small amount of water was added into the ionic liquid consisting of both LiI andt-butylpyridine as the additives.These improvements are brought about by enhancements of all ofJsc, andVoc. The increases inJscand are associated with thedecrease in charge transfer resistances on counter electrodes and increases in ionic conductivities.Voc may be explained by an in-crease in the dierence between redox potentials of I. /I3. and Fermi level..