Abstract

Extensive efforts are being made in enhancing the photoconversion efficiency of TiO2 based dye sensi- tized solar cells (DSSC) using different approaches. In this work, the Sn-doped TiO2 nanopowder was sensitized with flower extracts of Dahlia Violet (DV), Rabbit flower (RF) and their mixed extract separately other than the com- mercial N719 dye and DSSC characteristics were studied. Hydrothermal method was used to synthesize Sn-doped TiO2 for 48 h at 150 C. X-ray diffraction, UV-Vis, FTIR and Raman scattering were used to characterize the syn- thesized powder. DSSCs of the synthesized powder was fabricated using conventional sandwich type technique sealed with Surlyn polymer film. The photocurrent-volt- age characteristics were measured under solar simulated light using source-meter. It is interesting to note that the flower extract resulted in comparable photoconversion ef- ficiency as that of N719 dye. When the powder was sen- sitized with N719, 1.66 % efficiency was achieved while mixed extract resulted in 1.28 %, DV in 0.99 % and RF in 0.52 % efficiency. The results of various analysis tech- niques and cell characteristics are correlated.

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