Abstract
In this study, an effort has been made to replace costly ruthenium dye with natural dyes of mixed flower extract containing eight different colored flowers as Guldaudi (Chrysanthemum), Aster (genus), Dehlia brown and yellow, Dog rose pink (Rosa canina), field marigold
(Calendula arvensis), Dog rose yellow (Rosa canina), flower stalk and Sweet William (Dianthus barbatus) and mixed fruit extract of five different fruits as Dragon fruit (pitaya), Kiwi (Actinidia chinensis), Pomegranate (Punica granatum), Sapodilla (Manilkara
zapota) and Sweet lemon (Citrus limetta). We have eight samples of Europium doped TiO2 with atomic concentration ranging from 2.17×1016 to 43.5×1016. Increase in doping concentration causes increment in absorption. Particle size is found
within the range of 100 nm-200 nm. Extracted natural dyes were analyzed by UV-Visible spectroscopy. GC-MS characterization was done of both extracts with findings that Amyrins and Limonene are main compound in mixed flower extract and mixed fruit extract respectively. Thick films of
Eu doped TiO2 nanopowder were printed on FTO with organic binders, using Dr. Blade Technique and dried at 450 °C for one hour. Printed film was soaked in mixed flower extract for 24 hours. The photoconducting properties have been studied as a function of doping concentration
at irradiation intensity of 700 mW/cm2. An efficient increment in short-circuit current has been observed for mixed flower extract as compare to mixed fruit extract. This study suggests that mixed flower extract is more efficient and effective as compare to mixed fruit extract for
dye sensitized solar cell (DSSC). We report the increase in photoconducting properties of Eu doped TiO2 using mixed flower extracts.