I have prepared TiO2/MnO2 working electrode for DSSC device. The result shows poor performance (efficiency and FF). I think, the problem is Rs value unstable (too high). How to decrease Rs value and stabilize it?
I attached the result of I-V characteristic
Thanks
Hi Adi,
May be that the big value of resistance is due to a bad sintering of the nanoparticles (high resistance to the conduction of the photo-generated electrons through the porous film). In this case you should consider the internal resistance of your porous layer. I suggest you to use elecrochemical impedance spectroscopy (EIS) in order to investigate you system applying diffrent voltages near Voc in forward bias. In this way, you should understand which resistance value is responsible for the poor performance of your device. Try to fit your system using the transmission line equivalent circuit (Bisquert). You should optimize the experimental parameters of your experiment using a factorial design (design of experiments DOE) considering: the sintering temperature, the film´s thickness and the ratio between TiO2 and MnO2.
p.s.
in the attached publication, in the supporting information we used an equivalent circuit to fit the EIS response of a complete DSSC
Good luck
Mirko
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