4. Conclusions
A group of carbazole based organic dyes was simulated by increasing the
π- bridge length by adding an additional oligothiophene ring in
3different dyes. The increase π- bridge length significantly altered the
optical and electronic properties of dyes. The addition of an extra
oligothiophene ring resulted in increase of light harvesting efficiency
whereas the absorption spectrum of the dyes exhibited redshift. Except
the D3A, all the dyes exhibited absorption in visible region of light.
The photoinjection of these dyes was studied by attaching the dyes with
(TiO2) 96QDin monodentate mode. The
spectra calculated for (TiO2) 96-Dye
complexes indicated absence of any new peak which points to indirect
photoinjection in the studied configurations. The findings indicated
thatD2 offered least electron injection energy -0.11eV and least
recombination rate due to high recombination energy calculated among all
the dyes. After D2, D2Aexhibitedless injection energy of -0.17 eV. These
dyes could have promising applications in photoanode for enhancing the
efficiency of DSSC.
5. Funding InformationThe author would like to sincerely appreciate the Deanship of Scientific
Research at King Saud
University for its funding of this research through research group no.
RGP-255.