Abstract
A comparative study was done between liquid-state photoelectrochemical cells (PECs) consisting of photoactive electrodes of poly(3-hexylthiophene), P3HT, and a composite film of nanocrystalline titanium dioxide (nc-TiO 2) and P3HT. The nc-TiO 2/P3HT based device shows better performance with an open-circuit voltage of 0.51 V, a short-circuit current of 0.31 mA/cm 2, and a fill factor of 0.51 when illuminated with white light intensity of 100 mW/cm 2. The IPCE% obtained at 550 nm for P3HT based device was 0.18% while for that of the nc-TiO 2/P3HT based device was 4%. In P3HT based devices, P3HT showed its p-type behavior while in nc-TiO 2/P3HT based devices, P3HT acted as a sensitizer to nanocrystalline TiO 2.
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