Temperature dependence of open-circuit voltage in dye-sensitized solar cells

Abstract Temperature, T , dependence of open-circuit voltage, V oc , was investigated in home-assembled and maker-trial dye-sensitized solar cells, which had wide variety in V oc , i.e. 600–800 mV. A linear decrease of V oc was observed with increasing T ; all these cells had a slope of about −2.5 mV/°C, irrespective of the V oc s in the STC. The mechanism of the T dependence of V oc was discussed with the electrochemical impedance spectroscopy, EIS. Analyses of EIS data with a newly derived model revealed that this dependence is primarily ascribed to a shift of the TiO 2 conduction band.

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