Asymmetric simple unfused acceptor enabling over 12% efficiency organic solar cells

Abstract High photovoltaic performance with cost-effective material synthesis and device fabrication are the prerequisite for commercialization of organic solar cells (OSCs). Herein, we conduct a systematic structure-property correlation study on unfused acceptors adopting different frameworks. Dithieno[3,2-b:2',3'-d]pyrrole (DTP) based A-D1-D-D2-A asymmetric acceptor (DBT-4F) has been screened as a promising acceptor for high-efficient OSCs. Three DTP-based unfused acceptors display strong near-infrared absorption with narrow optical band gap (Egopt