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Download fileTime-Resolved Operando Spectroscopy for Dye-Sensitized Solar Cells from Multiple Perspectives
journal contribution
posted on 2022-04-26, 21:16 authored by Naoya Tajima, Katsuichi KanemotoWe have performed time-resolved operando measurements
based on continuous wave photo-induced absorption (cw-PIA) spectroscopy
to investigate the behaviors of carriers in operating dye-sensitized
solar cells (DSSCs). We demonstrate that PIA signals are obtained
from the electron carriers of the fluorine-doped tin oxide (FTO) electrode
and these signals can be utilized to study the operation dynamics
of DSSCs. The time-resolved operando experiments observe the PIA signals
of electron carriers individually from the FTO electrode and a TiO2 layer together with photocurrent measured simultaneously.
We reveal that the transfer of electron carriers in DSSCs after photoexcitation
is very slow and occurs in the order of TiO2, FTO, and
photocurrent. These PIA signals and photocurrents reach equilibrium
at approximately the same response rate determined by the transfer
rate of iodine ions, which corresponds to the rate for the entire
operating cycle. These operando measurements from multiple perspectives
are effective for elucidating the operational mechanism in real solar
cells and are widely applicable to a variety of solar cells.
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photocurrents reach equilibriumdoped tin oxidecontinuous wave photoentire operating cyclesensitized solar cellsreal solar cellsresponse rate determinedphotocurrent measured simultaneouslyelectron carriers individually2 subresolved operando spectroscopysolar cellsoperando electron carriersoperando measurementswidely applicableoperational mechanismoperation dynamicsoperating dyemultiple perspectivesmeasurements basedlayer togetheriodine ionsinduced absorption