SOLID STATE PHOTOELECTROCHEMICAL CELL BASED ON DYE SENSITIZED TiO2 AND POLYMER ELECTROLYTE COMPLEXED WITH I3¯/I¯

Abstract

A solid state photoelectrochemical solar energy conversion device based on nanocrystalline-TiO₂ sensitized with Di-Tetrabutylammoniumcis-bis(isothiocyanato)bis(2,2’-bipyridyl-4,4’-dicarboxylato)-ruthenium(II) (N719) dye has been constructed and characterized. The current density–voltage characteristics in the dark and under white light illumination and action spectra under monochromatic illuminations have been studied. The following device parameters were obtained when the potential is scanned: an open circuit voltage of 762 mV and a short circuit current density of 33 μAcm^-2 at light intensity of 100 mWcm^-2; the IPCE percentage obtained was 1.7% at 330 nm. The dependence of the short-circuit current density and an open circuit voltage on the incident light intensity and illumination time have also been studied. The results of time dependence study show that the steady state J_sc and V_oc values are consistent with those obtained from the J–V curve.