Study of Light Harvesting Properties of Different Classes of Metal-Free Organic Dyes in TiO₂ Based Dye-Sensitized Solar Cells

Table 1

Molecular formula, colour, solubility, value, and structure of fluorone, triarylmethane, azo, and thiazine based metal-free organic dyes.

Dyes	Colour	Formula (M. Wt.)	Solubility	(nm)	Structure
Fluorone based dyes
Phloxine B	Red	C20H2Br4Cl4Na2; (829.7)	Slightly in water and ethanol	548 nm
Ethyl eosin	Red	C22H11O5Br4Na; (714)	Slightly in ethanol and water	532 nm
Eosinol	Red	C20H8Br4O5; (647.9)	Slightly in water and moderately in ethanol	524 nm
Erythrosin B	Maroon	C20H6O5I4Na2; (879.9)	Slightly in water and ethanol	524 nm
Triarylmethane based dyes
Victoria blue 4R	Blue	C34H34N3Cl; (520.1)	Ethanol and slightly in water	591 nm
Methyl green	Green	C26H33N3Cl2; (458.5)	Soluble in ethanol	630 nm, 420 nm
Acid fuchsin	Red	C20H17N3Na2O9S3; (585.6)	Water, slightly in ethanol	540–546 nm
Chromoxane cyanin R	Yellow brown	C23H15O9SNa3; (536.4)	Readily soluble in water and ethanol	518 nm
Azo based dyes
Sudan III	Red	C22H16N4O; (352.4)	Slightly in ethanol	507 nm
Orange G	Orange	C16H10N2O7S2Na2; (452.386)	Slightly in water and ethanol	475 nm
Azophloxine	Red	C18H13N3O8S2Na2; (509.44)	Soluble in water and slightly soluble in ethanol	532, 506 nm
Xylidine Ponceau	Red	C18H14N2O7S2Na2; (480.44)	Soluble in water and slightly soluble in ethanol	503 nm
Thiazine based dyes
Azure C	Blue	C13H12N3SCl; (277.8)	Readily soluble in ethanol	616 nm
Azure B	Blue	C15H16N3SCl; (305.8)	Readily soluble in ethanol	648 nm
Toluidine blue O	Blue	C15H16N3SCl; (305.8)	Slightly in water and ethanol	626 nm