Dithieno[2,3-d;2′,3′-d′]benzo[1,2-b;4,5-b′]dithiophene based organic sensitizers for dye-sensitized solar cells

Abstract

We report two novel D–π–A type organic dyes with a coplanar dithieno[2,3-d;2′,3′-d′]benzo[1,2 b;4,5-b′]dithiophene (DTBDT) as π-spacer for dye-sensitized solar cells. A best device performance with a power conversion efficiency of 6.32% is achieved, making DTBDT unit a promising building block for design of organic sensitizers.