Affiliation:
1. School of Environmental Engineering and Chemistry Luoyang Institute of Science and Technology Luoyang 4710023 China
2. School of Materials Science and Engineering Zhengzhou University Zhengzhou 450001 China
3. Key Laboratory of Function‐Oriented Porous Materials, College of Chemistry and Chemical Engineering Luoyang Normal University Luoyang 471934 China
4. School of Chemistry and Life Sciences Suzhou University of Science and Technology Suzhou 215009 China
Abstract
AbstractNonfullerene acceptors with mediate bandgap play a crucial role in ternary devices as the third component, further boosting the performance of organic solar cells (OSCs). Herein, three F‐series acceptors (F‐H, F‐Cl, and F‐2Cl) with mediate bandgap are selected and introduced into the PM6:BDT‐Br binary system as third component to find the detailed influence of end groups with chlorine (Cl) atom substitution on the performance of ternary organic solar cells. Due to the increased substitution of Cl atoms on the end groups, F‐Cl and F‐2Cl as guest acceptors reveal a superior ability to regulate the morphology of blend films, contributing to the ordered packing properties and high crystallinity. As a result, F‐Cl and F‐2Cl based ternary OSCs achieve significantly improved PCEs of 13.89% and 14.67%, respectively, compared with the binary devices (12.70%). On the contrary, F‐H without Cl atom displays a poor compatibility with the host system, resulting in an inferior ternary device with a low PCE of 10.79%. This work indicates that F‐series acceptors with mediate bandgap are a promising class of third component for high‐performance ternary OSCs. And introducing more Cl atoms substitution on the end groups, especially F‐2Cl, will own a broad applicability for other binary devices.
Funder
National Natural Science Foundation of China
China Postdoctoral Science Foundation
Subject
Materials Chemistry,Polymers and Plastics,Organic Chemistry