Affiliation:
1. College of Materials and Chemistry & Chemical Engineering Chengdu University of Technology Chengdu 610059 P. R. China
2. School of Chemical Engineering Key Laboratory of Green Chemistry and Technology of Ministry of Education and State Key Laboratory of Polymer Materials Engineering Sichuan University Chengdu 610065 P. R. China
3. Key Laboratory of Applied Surface and Colloid Chemistry of Ministry of Education Shaanxi Key Laboratory for Advanced Energy Devices Shaanxi Engineering Lab for Advanced Energy, Technology School of Materials Science & Engineering Shaanxi Normal University Xi'an 710119 P. R. China
4. National Synchrotron Light Source II Brookhaven National Lab Suffolk Upton NY 11973 USA
Abstract
AbstractA desired morphology is essential for achieving efficient polymer solar cells. Donors and acceptors with appropriate crystallization can lead to a suitable phase‐separated morphology for effective photocurrent generation process. Inspired by the success of Y6 acceptors and the 2D side chain engineering on popular polymer donors and small molecule acceptors, the usage of unique 2D 3,4‐ethylene dioxythiophene (EDOT) side chains on Y6 to regulate its crystallinity, compatibility, and thus the related blend morphology is explored. In this study, two molecules of BTP‐EDOT‐4F and BTP‐EDOT‐4Cl with such unique 2D EDOT side chains are designed and synthesized. Due to the advantage of EDOT side chain, when these molecules are blended with PM6, the decent power conversion efficiencies (PCEs) of 16.78% and 15.87% are obtained. Furthermore, BTP‐EDOT‐4F is selected as the third component and added into PM6:L8‐BO binary system to form ternary blends. The optimized crystallinity, compatibility, and morphology of such ternary blend are discovered in the presence of BTP‐EDOT‐4F, which enables efficient exciton dissociation and charge transport as well as decreased recombination, resulting in higher short circuit current density (Jsc) and fill factor. Finally, the outstanding PCE of 18.56% is achieved in ternary blends containing PM6, L8‐BO, and BTP‐EDOT‐4F.
Funder
National Natural Science Foundation of China
Sichuan University
China Postdoctoral Science Foundation
Brookhaven National Laboratory
Subject
Electrochemistry,Condensed Matter Physics,Biomaterials,Electronic, Optical and Magnetic Materials
Cited by
10 articles.
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