In this work, six new D-A-蟺-A sensitizers (
ID1鈥?b>ID6), with triarylamine as t
he electron donor; isoindigo as a auxiliary electron withdrawing unit; thiop
hene, furan, and benzene as t
he linker; and cyanoacrylic acid as t
he anchoring group, were synt
hesized through simple synt
hetic procedures and with low cost. T
heir absorption spectra were broad with long wavelength absorption maximum approximately at 589 nm and t
he absorption onset at 720 nm on t
he TiO
2 film. Electroc
hemical experiments indicate that t
he HOMO and LUMO energy levels can be conveniently tuned by alternating t
he donor moiety and t
he linker. All of t
hese dyes performed as sensitizers for t
he DSSCs test under AM 1.5 similar experimental conditions, and a maximum overall conversion efficiency of 5.98% (
Jsc = 14.77 mA cm
鈥?,
Voc = 644 mV,
ff = 0.63) is obtained for
ID6-based DSSCs w
hen TiO
2 films were first immersed for 6 h in 20 mM CDCA ethanol solution followed by 12 h of dipping in t
he dye CH
2Cl
2 solution. Electroc
hemical impedance measurement data implies that t
he electron lifetime can be increased by coadsorption of CDCA, which leads to a lower rate of charge recombination and thus improved
Voc.
Keywords:
isoindigo; D-A-蟺-A; broad absorption; henodeoxycholic+acid&qsSearchArea=searchText">chenodeoxycholic acid; solar cells; triarylamine