Affiliation:
1. Key Laboratory of Organosilicon Chemistry and Materials Technology of Ministry of Education College of Materials Chemistry and Chemical Engineering Hangzhou Normal University Hangzhou 311121 P. R. China
2. Hoffmann Institute of Advanced Materials Shenzhen Polytechnic University Shenzhen 518055 P. R. China
3. The Institute for Advanced Studies Wuhan University Wuhan 430072 P. R. China
4. State Key Laboratory of Silicon and Advanced Semiconductor Materials Department of Polymer Science and Engineering Zhejiang University Hangzhou 310027 P. R. China
Abstract
AbstractThe ternary strategy proves effective for breakthroughs in organic photovoltaics (OPVs). Elevating three photovoltaic parameters synergistically, especially the proportion‐insensitive third component, is crucial for efficient ternary devices. This work introduces a molecular design strategy by comprehensively analyzing asymmetric end groups, side‐chain engineering, and halogenation to explore the outstanding optoelectronic properties of the proportion‐insensitive third component in efficient ternary systems. Three asymmetric non‐fullerene acceptors (BTP‐SA1, BTP‐SA2, and BTP‐SA3) are synthesized based on the Y6 framework and incorporated as the third component into the D18:Y6 binary system. BTP‐SA3, featuring asymmetric terminal (difluoro‐indone and dichloride‐cyanoindone terminal), with branched alkyl side chains, exhibited high open‐circuit voltage (VOC), balanced crystallinity and compatibility, achieving synergistic enhancements in VOC (0.862 V), short circuit‐current density (JSC, 27.52 mA cm−2), fill fact (FF, 81.01%), and power convert efficiency (PCE, 19.19%). Device based on D18/Y6:BTP‐SA3 (layer‐by‐layer processed) reached a high efficiency of 19.36%, demonstrating a high tolerance for BTP‐SA3 (10–50%). This work provides novel insights into optimizing OPVs performances in multi‐component systems and designing components with enhanced tolerance.
Funder
Natural Science Foundation of Zhejiang Province
National Natural Science Foundation of China
Hangzhou Normal University
National Key Research and Development Program of China