Enhancement of photovoltaic performances in dye-sensitized solar cells by co-sensitization with metal-free organic dyes

A one-step dye cocktail strategy is proposed for the efficient sensitization of a ZnO photoelectrode in dye-sensitized solar cells. A high IPCE plateau is obtained between 400 and 600 nm by using two complementary indoline metal-free organic dyes. The roles of the co-adsorbents are also investigated and the cells are shown to be highly stable upon aging.