Affiliation:
1. State Key Laboratory of Silicon Materials MOE Key Laboratory of Macromolecular Synthesis and Functionalization Department of Polymer Science and Engineering Zhejiang University Hangzhou 310027 P. R. China
2. Department of Chemistry Zhejiang University Hangzhou 310027 P. R. China
3. State Key Laboratory for Modification of Chemical Fibers and Polymer Materials Center for Advanced Low‐dimension Materials College of Materials Science and Engineering Donghua University Shanghai 201620 P. R. China
4. The Institute for Advanced Studies Wuhan University Wuhan 430072 P. R. China
5. Zhejiang University‐Hangzhou Global Scientific and Technological Innovation Center Hangzhou 310014 P. R. China
Abstract
AbstractThe ternary blend is demonstrated as an effective strategy to promote the device performance of organic photovoltaics (OPVs) due to the dilution effect. While the compromise between the charge generation and recombination remains a challenge. Here, a mixed diluent strategy for further improving the device efficiency of OPV is proposed. Specifically, the high‐performance OPV system with a polymer donor, i.e., PM6, and a nonfullerene acceptor (NFA), i.e., BTP‐eC9, is diluted by the mixed diluents, which involve a high bandgap NFA of BTP‐S17 and a low bandgap NFA of BTP‐S16 (similar with that of the BTP‐eC9). The BTP‐S17 of better miscibility with BTP‐eC9 can dramatically enhance the open‐circuit voltage (VOC), while the BTP‐S16 maximizes the charge generation or the short‐circuit current density (JSC). The interplay of BTP‐17 and BTP‐S16 enables better compromise between charge generation and recombination, thus leading to a high device performance of 19.76% (certified 19.41%), which is the best among single‐junction OPVs. Further analysis on carrier dynamics validates the efficacy of mixed diluents for balancing charge generation and recombination, which can be further attributed to the more diverse energetic landscapes and improved morphology. Therefore, this work provides an effective strategy for high‐performance OPV for further commercialization.
Funder
National Natural Science Foundation of China
National Key Research and Development Program of China
Fundamental Research Funds for the Central Universities
China Postdoctoral Science Foundation
Zhejiang University
Subject
Mechanical Engineering,Mechanics of Materials,General Materials Science
Cited by
100 articles.
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