A Facile Method to Enhance Photovoltaic Performance of Benzodithiophene‐Isoindigo Polymers by Inserting Bithiophene Spacer

Abstract

A series of conjugated polymers containing benzodithiophene as donor and isoindigo as acceptor with no, one, two and three thiophene spacer groups is synthesized and characterized. The polymer with bithiophene as a spacer has a superior efficiency of 7.31% in solar cells. This demonstrates an important design strategy to produce polymers for high-performance solar cells by inserting thiophene spacer groups.