Organic dyes with remarkably high absorptivity; all solid-state dye sensitized solar cell and role of fluorine substitution

Abstract

A series of new organic D–π–A dyes, A1, A2-H and A2-F, possessing a remarkably high absorption extinction coefficient of ε > 5.0 × 10⁴ 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.