To
study the various fundamental processes occurring inside the
dye sensitized solar cell (DSSC), we have fabricated devices employing
newly synthesized diphenylamine-based organic dyes with A-D-π-A
configuration, carrying four different anchoring groups, namely, cyanoacetic
acid (DDC), rhodanine acetic acid (DDR), 4-hydrazinylbenzoic acid
(DDH), and barbituric acid (DDB), as effective sensitizers/cosensitizers.
In the present work, all the bianchoring dyes were subjected to photophysical,
electrochemical, thermodynamic, photoelectrochemical, and theoretical
studies. All of them displayed characteristic λabs and λemi in the range of 415–480 and 570–680
nm, respectively. Their optical and electrochemical band gaps were
calculated to be in the order of 2.1 to 2.3 eV. The calculated driving
forces for electron injection (ΔG
inj), recombination (ΔG
inj), and regeneration
(ΔG
reg) processes were found to
be negative, showing the feasibility of these processes, while their
DFT studies clearly indicated the directional flow of electrons within
the dye in the cell. The devices with DDC as sensitizer displayed
the highest conversion efficiency of 2.53%, whereas DDB exhibited
the maximum of 7.69% when employed as a cosensitizer along with Ru
(II) based HD-2 dye. Finally, EIS circuit fitting was carried out
in order to obtain different interface resistance values to study
the fundamental processes of energy conversion.
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