Organic dyes with remarkably high absorptivity; all solid-state dye sensitized solar cell and role of fluorine substitutionElectronic supplementary information (ESI) available: Experimental details. See DOI: 10.1039/c0cc00808g

A series of new organic D-π-A dyes, A1, A2-H and A2-F, possessing a remarkably high absorption extinction coefficient of > 5.0 × 10 4 M −1 cm −1 at peak wavelength were synthesized, among which, A2-F having a key fluorine substitution attains excellent all solid-state DSSC performance, with optimized parameters of η = 4.86%, J SC = 7.52 mA cm −2 , V OC = 0.91 V, and FF = 0.71. New D-π-A dye A2-F, having a key fluorine substitution, attains excellent all solid-state DSSC performance: η = 4.86%, J SC = 7.52 mA cm −2 , V OC = 0.91 V and FF = 0.71.