The current-voltage (I-V) characteristics of P. marsupium stem bark extract Dsscs fabricated using conventional and pre dye sensitized treated TiO2 nano particles under the AM 1.5 G illumination at 100 mw/cm2 are shown in Fig. 7. The light photon to electron conversion efficiency of both cells was studied. The fill factor (FF) was found using the relation as given below,