Structure-Property Relationship of New Organic Sensitizers Based on Multicarbazole Derivatives for Dye-Sensitized Solar Cells

Table 1

Electrochemical parameters of organic dyes.

Dye	𝜀max^a/M^−1 cm^−1	𝜆max^a/nm (Sol)	𝐸0-0/(eV)^b (abs)	𝐸^cox  (V vs. NHE)	𝐸ox − 𝐸0-0^d  (V vs. NHE)	HOMO (eV)	LUMO (eV)
C1A1	15260	392	2.64	0.84	−1.8	−5.23	−2.59
C2A2	22815	417	2.5	0.68	−1.82	−5.07	−2.57
C2S1A1	26191	442	2.28	0.5	−1.78	−4.89	−2.61

aMaximum absorption and extinction coefficient at maximum absorption of dyes in chloroform solution. ^b𝐸_0-0 (band gap) was determined from intersection of absorption and emission spectra in chloroform solution. ^cOxidation potential (𝐸_HOMO) of dye was measured using cyclic voltammogram in chloroform solution. ^d𝐸_HOMO − 𝐸_0-0 = 𝐸_LUMO.