ACS Appl. Mater. Interfaces 2015, 7, 22436−22447. In this work, four new D−D−π−A organic dyes with dithieno[3,2-b:2′,3′-d]pyrrole (DTP) or bis(amine) donor have been designed and synthesized for a investigation of the influence of the terminal electron donor in D−D−π−A organic dye-sensitized solar cells.