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Impedance spectroscopy study of dye-sensitized solar cells with undoped spiro-OMeTAD as hole conductor
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Image of FIG. 1.
FIG. 1.

Voltammetries of an OMeTAD cell. Fresh samples need certain time to re-locate the ions and reach the maximum efficiency. This time may be reduced by cycling or simply keeping the sample at a negative potential in the dark.

Image of FIG. 2.
FIG. 2.

decays of OMeTAD cell and liquid electrolyte. The lower recombination time in the liquid cell agrees with its much higher efficiency.

Image of FIG. 3.
FIG. 3.

Absorption spectroscopy transients of liquid and OMeTAD cells in the dark (a) and under white bias illumination (b).

Image of FIG. 4.
FIG. 4.

Impedance spectra of samples #B3 at (a) and #T2 at (b). The respective insets show the high frequency arcs in both cases. Arrow in (b) points transport effect in the spectrum. This effect disappears both at more negative and more positive potentials.

Image of FIG. 5.
FIG. 5.

Resistance of the OMeTAD measured with IS of blank cells #B1, #B1b, #B2, #B3, and #B3b of different thickness.

Image of FIG. 6.
FIG. 6.

Total resistance (a) and capacitance (b) of different samples of OMeTAD, #B4, unsensitized , #T2, and a complete cell, #O7.

Image of FIG. 7.
FIG. 7.

Comparison of characteristic times calculated from IS and decay.

Image of FIG. 8.
FIG. 8.

dc Resistance of a complete OMeTAD DSSC, #O7, in the dark and under illumination at different potentials.

Image of FIG. 9.
FIG. 9.

Proposed equivalent circuit for the impedance of OMeTAD DSSC.


Generic image for table
Table I.

Configuration of the different samples.


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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Impedance spectroscopy study of dye-sensitized solar cells with undoped spiro-OMeTAD as hole conductor