Dye-sensitized solar cells based on poly(ethylene glycol) electrolyte containing oxotitanium(IV) 5,10,15,20-tetrakis(p-toyl)porphyrin

We have focused on the synthesis and photovoltaic properties of oxotitanium(IV) 5,10,15,20-tetrakis(p-toyl) porphyrin (TiO-TTP) as an additive in the dye-sensitized solar cell (DSSC). The chemical structure of TiO-TTP synthesized was characterized by FT-IR and ¹H-NMR spectroscopy. We have prepared the DSSC device, using N3 dye as a photosensitizer, sandwiched with a TiO2-deposited electrode and a Pt-coated electrode as two electrodes. In order to investigate the photovoltaic effects of the DSSC devices, the FTO/TiO2/Dye/Electrolyte/Pt device was fabricated by using the poly(ethylene glycol) (PEG) electrolyte based on TiO-TTP as the additive. The photovoltaic performances of the DSSC devices were measured by solar simulator under 100 mW/cm² at AM 1.5. The Jsc is 7.75 mA/cm² and the VOC is 0.76 V and the FF is 0.62, leading to a calculated power conversion efficiency of 3.60 %. When TiO-TTP was introduced into the PEG electrolyte, the η of DSSC device was shown remarkably a high value compared with the value of that without TiO-TTP or metal free TTP. This result was caused by the adsorption on the interface between nanocrystalline porous TiO2 films and PEG electrolyte by TiO center of TiO-TTP.