Dye-sensitized solar cells are currently attracting a great deal of both scientific and industrial interest,owing to their grand potential of supplying clean electricity at a preferable performance/price ratio.In recent years,structure design and optimization of dye sensitizers have achieved considerable progress.Absorption spectra of the dyes can be effectively broadened through introducing new low-band-gap groups such as benzothiadiazole,diketopyrrolopyrrole and bithiazole as π conjugation,strong electron donors like aromatic amine,indoline or designing D-D-π-A structure,thereby improve short-circuit photocurrent density.