Tuning Conjugated Chain Ends in Small Molecular Acceptors for Enhancing Molecular Packing in Binary Blend acceptors and Inducing High Efficiency in Planar Junction Organic Photovoltaics

A series of AD'A'D'A type small-molecule acceptors based on dithienothiophen-pyrrolo-benzothiadiazole core and dicyanomethylene-3-indanone (Y5-IC) with different types of conjugated chain end units such as thiophene (-T), thieno[3,2-b]thiophene (-TT), and dithieno[3,2-b:2’,3’-d]thiophene...