A large amount of attention has been caught on dye-sensitized solar cells(DSCs)to support the coming sustainable energy supply,in the worldwide theme of questing for low-cost,eco-friendly technologies of converting the affluent solar light to clean electricity.Ruthenium(Ⅱ)bipyridine complexes have been employed for the commercial DSC products and zinc porphyrin complexes have been demonstrated thus far to be the most efficient photosensitizers in DSCs,exhibiting 13％power conversion efficiency at the Am1.5G conditions.Meanwhile,owing to the wide availability of raw materials and the grand flexibility of molecular tailoring,metal-free organic dyes also have been actively pursued and impressive advances have been attained in the past years,mainly via judicious conjugating electron-rich and electron-deficient blocks as well as rational modulating photo-inactive auxiliary moieties.However,this advancement was slowed down from 2010 to 2012 in spite of the birth of a large amount of new and complex dye molecules.One fundamental reason is the relatively large energy-gaps of simple organic sensitizers developed in the earlier period,which do not meet some critical kinetic limitations presently faced by the new infrared absorptions dyes.For dye-sensitized solar cells made with some medium-sized single-electron redox couples,it is still a big challenge to enhance the capacity of capturing solar photons while at the same time control the separation and recombination of charges at the functional nanojunction.In this talk,I will present our recent work on new materials development as well as interface engineering,highlighting the urgent attentions on controlling the three key charge recombination pathways involving the species of excited dye molecules,photo-oxidized dye molecules and oxidants in electrolytes.Without these controls,any type of low energy-gaps dyes must be less meaningful for the Gr?tzel cells.Our recent studies have suggested that it will be very instructive in the future studies to examine the atomic picture(microstructure)of the complicate photoanode interface composed of various components,apart from that of the individual dye molecules.