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Efficiency Enhancement of Dye Sensitized Solar Cell Using Composite
P25-TiO2/Carbon Nanotubes Photoanode with Platinum Counter Electrode

Present study includes enhancing the efficiency of the prepared dye sensitized solar cell (DSSC) by
using Degussa (Evonik) P25 with carbon nanotubes (CNTs) composites as the photoanode electrode
instead of using TiO2 alone. Platinum was used as the counter electrode with the use of natural
pomegranate dye and KI/I2 as electrolyte solution. The morphology of the prepared composites were
characterized using X-ray diffraction (XRD), Raman spectroscopy, scanning electron spectroscopy
(SEM) and UV-visible diffuse reflectance spectra for all ratios prepared from P25/CNTs composites,
The results showed that the CNTs dopant were incorporated into interstitial position of the P25 lattice
nanoribbons with diameter of (30-75) nm and length of few micrometers. The calculated optical band
gap for P25 and P25/CNTs in ratios 1:2.5% were 3.22 eV and 3.00, respectively. These modified
properties of the P25/CNTs composites showed an important effect on the conversion efficiency of
the assembled dye sensitized solar cells, where the efficiency of the P25 and P25/CNTs composites
was 2.962% and 3.679%, respectively. This indicates that the efficiency of the DSSCs was increased
relatively when using P25/CNTs composite instead of P25 alone as a photoanode when the other
components of the cell were applied under the same preparation and fabrication conditions for the
investigated DSSCs.