[2,2'-Bithiophene]-5-carboxaldehyde, 5'-bromo-3,3'-dihexyl-

5''-Bromo-3,3''-dihexyl[2,2''-bithiophene]-5-carboxaldehyde is a useful intermediate in the preparation of organic dyes containing tert-butyl-capped N-arylcarbazole moiety for dye-sensitized solar cells.