Two ferrocenyl benzimidazoles with carboxylic (1) and nitro (2) anchors have been synthesized and characterized using microanalyses, IR, 1H and 13C NMR spectroscopy, and in one case using single crystal X-ray diffraction. UV-Vis spectroscopic studies indicate that in comparison to ferrocene the electronic absorption bands of the synthesized 1 and 2 dyes are bathochromically shifted up to 530 nm with concomitant enhancement in their intensities. The synthesized dyes have been exploited as a photosensitizer in TiO2-based dye-sensitized solar cells (DSSCs). The photovoltaic performances and charge transport properties (EIS spectra) were studied to evaluate the synthesized dye performance in DSSCs. Amongst both the dyes, the one with the carboxylic anchor showed relatively superior photovoltaic performance in comparison to the dye with a nitro anchor. The superior performance of 1 is probably due to the better anchorage and superior dye loading capability on the TiO2 surface, which suppresses charge recombination, prolongs electron lifetime, and decreases the total resistance of the DSSC. The assembly fabricated using 1 showed the best performance with an overall conversion efficiency η of 5.81%, Jsc of 12.74 mA cm-2, and Voc of -0.648 V. The obtained efficiency is ∼84% of the cell efficiency compared with the state-of-the-art N719 dye in similar conditions.
ASJC Scopus subject areas
- Materials Chemistry