Novel Imidazole Substituted Bodipy-Based Organic Sensitizers in Dye-Sensitized Solar Cells

Table 1

Photophysical and electrochemical data of three dyes.

Dye	λmax (nm)^a	ε × 10^−4 (M^−1·cm^-1)^a	λmax (nm)^b	fwhm (nm)^c	Eox^onset (V)^d	E0,0 (eV)^e	Eox (V)^f
BPI-P	531	6.20	505	38 (92)	1.26	2.22 (560 nm)	−0.96
BPI-T	531	6.40	527	47 (>175)	1.19	2.11 (588 nm)	−0.92
DPI-T	532	8.02	528	49 (170)	1.20	2.11 (589 nm)	−0.91

^aAbsorption maximum in CHCl₃ solution. ^bAbsorption maximum on TiO₂ was obtained through measuring the dyes adsorbed on 6 μm TiO₂ nanoparticle films. ^cValues in CHCl₃ solutions (on TiO₂ film). ^dE_ox^onset was measured in CH₂Cl₂ with 0.1 M TBAPF₆ as the electrolyte. ^eE_0,0 was estimated from the onset point of the absorption spectra. ^fE_ox was estimated by subtracting E_0,0 from the E_ox^onset.