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Naji, M. |
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Motta, Antonella |
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Aletan, Dirar |
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Mohamed, Tarek |
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Taccardi, Nicola |
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Ali, M. A. |
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Rančić, M. |
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Cervini, R.
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article
BaTiO3-coated TiO2 working electrodes for use in dye-sensitised solar cells
Abstract
<p>Nanostructured TiO<sub>2</sub> working electrodes were coated with thin films of BaTiO<sub>3</sub> using the sol-gel technique. These core-shell electrodes were made and compared against the control samples (bare TiO<sub>2</sub>). The electrodes were characterized using scanning electron microscopy (SEM), energy dispersive X-ray Spectroscopy (EDX), powder X-ray diffraction (XRD), X-ray photoelectron spectroscopy and used in the construction of dye-sensitised solar cells (DSSCs). It was found that all the BaTiO<sub>3</sub>-coated samples resulted in an increase in the open circuit voltage (V<sub>oc</sub>) from 735mV to 818mV. However, the short circuit current (J<sub>sc</sub>) was lower than the control samples with a decrease from 5.6mAcm<sup>-2</sup> to 4.3mAcm<sup>-2</sup>. The combination of these changes resulted in a decrease in efficiency from 2.6% to 2.3%. However, when a 2.45GHz microwave heat treatment was used instead of the conventional heat treatment the efficiency rose back up to 2.5%. This increase was due to a further increase in the V<sub>oc</sub> up to 823mV but still a lower current.</p>