[6p-A501-1~21] 12.5 Organic solar cells

[6p-A501-17] Evaluation of carrier dynamics in dye-sensitized solar cells by simultaneous measurements of photoinduced absorption and short-circuit photocurrent

〇Katsuichi Kanemoto¹, Daichi Takatsuki¹ (1.Osaka City Univ.)

Keywords:Dye-sensitized solar cell, spectroscopy, photoconductivity

Continuous wave-photoinduced absorption (PIA) measurements were performed simultaneously with photovoltage or photocurrent (PC) measurements to monitor slow transfer processes of electron carriers in operating dye-sensitized solar cells (DSCs). Time-resolved simultaneous experiments demonstrate that the rise curve of PC during photoexcitation is delayed against that of PIA signals. The delay is analyzed by a model that considers effects of electron transfer on PIA signals and shown to be determined by transfer time of electrons over the TiO₂ film. On the contrary, no delay is found between the decay curves at excitation-off of PIA signals and PC, suggesting that the transfer kinetics of TiO₂ electron varies after the electrons reach the transparent electrode. These spectral features indicate that the time-resolved PIA signals of TiO₂ electron under short-circuit conditions are primarily determined by its slow transfer process.