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SEM image depicts a nanocrystalline network of particles, while AFM microscopy proves that these
nanoparticles are oriented in a parallel way that they form a kind of tubes or wires (Figure 2).
Figure 2: Characteristic SEM (left) and AFM (right) images of titania films calcined at 550 o C.
DSSCs consist of three main parts: a semiconductor thin film electrode on transparent conductive glass
(TCO) sensitized in the visible region by a molecular dye, a second counter electrode made of platinum sputtered on
TCO and a redox electrolyte which ensures electrical connectivity between these two electrodes. Therefore, the final
films were sensitized by the classical N719 dye (Solaronix SA) and were incorporated in a sandwich-type DSSC using
a Dyesol liquid electrolyte (PMII ionic salt). It should be noticed that although slight differences were obtained in
particle size and rutile content, no differences were observed in the I-V measurements. The best solar energy
conversion efficiency (n) attained by titania films calcined at 550 0 C was approximately 2.81% with a J sc of 5.38
mA/cm 2 , a large V oc in the order of 0.786V and a F.F. of 0.66 (Figure 3).
6
5
J
SC
(mA/cm 2 )
4
3
2
1
V oc
=786 mV
J sc
=5,38 mA\cm 2
FF=0,66
n=2,81%
0
0 100 200 300 400 500 600 700 800
Applied potential vs. Pt (mV)
Figure 3: I-V graph of DSSCs made with the use of nanocrystalline titania film calcined at 550 o C
References:
[1] Adachi M., Murata Y.,Takao J., Jiu J., Sakamoto M., Wang F., J. Am. Chem. Soc. 126 (2004)
14943.
[2] Ngamsinlapasathian S., Sreethawong T., Suzuki Y., Yoshikava S., Solar Energy Materials &
Solar Cells 90 (2006) 2129.
[3] Ngamsinlapasathian S., Sakulkhaemaruethai S., Pavasupree S., Kitiyanan A., Sreethawong T., Suzuki Y.,
Yoshikava S., J. Photochem. Photobiol. A:Chem. 164 (2004) 145.
Acknowledgement
Thanks must be addressed to Leyteris Peykianakis (from University of Patras) for taking the SEM images and Dyesol
company (Australia) for kindly providing the electrolyte. Financial support from PENED1313 “Organic Solar Cells” is
also greatly acknowledged.
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