Three
novel organic dyes coded as FHD4, FHD5,
and FHD6 featuring spiro[dibenzo[3,4:6,7]cyclohepta[1,2-b]quinoxaline-10,9′-fluorene] (SDBQX) moieties were developed for dye-sensitized solar cells (DSSCs).
The fluorenyl moiety of SDBQX is perpendicular to the
quinoxaline moiety, which is beneficial in inhibiting the H-aggregation
in DSSCs. The band gap energies according to DFT calculations showed
a good correlation with the transition energy calculated from the
absorption spectra, which indicates that the DFT calculations would
be an effective method to predict the absorption spectra range for FHD-type dyes. Broad spectral coverage and a high molar extinction
were observed in the absorption spectrum of FHD4, which
leads to the best power conversion efficiency that was obtained for
the FHD4-based DSSC. Coadsorption of CDCA improved the
power conversion efficiency slightly for FHD4-based DSSCs
(from 4.61 to 4.69%) and FHD6-based DSSCs (from 3.59
to 3.69%). The coadsorption of CDCA decreased the dye loading amount
of FHD5 significantly, while the power conversion efficiency
increased significantly from 3.18 to 3.73%. Finally, we have developed SDBQX as a new architecture for developing efficient organic
dyes for DSSC applications.
Three novel organic dyes coded as FHD4‐1, FHD4‐2, and FHD4‐3 featuring spiro[dibenzo[3,4:6,7]cyclohepta[1,2‐b]quinoxaline‐10,9′‐fluorene] (SDBQX) moieties are designed to inhibit dye aggregation to improve the performance of dye‐sensitized solar cells (DSSCs). The consistent absorption onsets of FHD4‐1, FHD4‐2, and FHD4‐3 in solutions and adsorbed on TiO2 films indicate that these dyes are aggregation‐free dyes. Therefore, coadsorption with chenodeoxycholic acid (CDCA) of these three dyes reduces the performance of DSSCs because no inhibition effect for dye aggregation is needed, but, on the contrary, the dye loading amount is reduced after addition of CDCA.
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