Electronic Configuration Tuning of Centrally Extended Non‐Fullerene Acceptors Enabling Organic Solar Cells with Efficiency Approaching 19 %

Author:

Duan Tainan12ORCID,Feng Wanying1,Li Yulu2,Li Zhixiang1,Zhang Zhe1,Liang Huazhe1,Chen Hongbin1,Zhong Cheng3,Jeong Seonghun4,Yang Changduk4,Chen Shanshan5,Lu Shirong2,Rakitin Oleg A.6,Li Chenxi1,Wan Xiangjian1,Kan Bin7,Chen Yongsheng1ORCID

Affiliation:

1. State Key Laboratory and Institute of Elemento-Organic Chemistry The Centre of Nanoscale Science and Technology and Key Laboratory of Functional Polymer Materials Renewable Energy Conversion and Storage Center (RECAST) College of Chemistry Nankai University Tianjin 300071 China

2. Chongqing Institute of Green and Intelligent Technology Chongqing School, University of Chinese Academy of Sciences (UCAS Chongqing) Chinese Academy of Sciences Chongqing 400714 China

3. Hubei Key Laboratory on Organic and Polymeric Opto-electronic Materials College of Chemistry and Molecular Sciences Wuhan University Wuhan 430072 China

4. Department of Energy Engineering School of Energy and Chemical Engineering Perovtronics Research Center Low Dimensional Carbon Materials Center Ulsan National Institute of Science and Technology (UNIST) Ulsan 44919 Republic of Korea

5. Key Laboratory of Low-grade Energy Utilization Technologies and Systems CQU-NUS Renewable Energy Materials & Devices Joint Laboratory School of Energy & Power Engineering Chongqing University Chongqing 400044 China

6. N. D. Zelinsky Institute of Organic Chemistry Russian Academy of Sciences 47 Leninsky Prospekt 119991 Moscow Russia

7. School of Materials Science and Engineering National Institute for Advanced Materials Nankai University Tianjin 300350 China

Abstract

AbstractIn the molecular optimizations of non‐fullerene acceptors (NFAs), extending the central core can tune the energy levels, reduce nonradiative energy loss, enhance the intramolecular (donor‐acceptor and acceptor‐acceptor) packing, facilitate the charge transport, and improve device performance. In this study, a new strategy was employed to synthesize acceptors featuring conjugation‐extended electron‐deficient cores. Among these, the acceptor CH‐BBQ, embedded with benzobisthiadiazole, exhibited an optimal fibrillar network morphology, enhanced crystallinity, and improved charge generation/transport in blend films, leading to a power conversion efficiency of 18.94 % for CH‐BBQ‐based ternary organic solar cells (OSCs; 18.19 % for binary OSCs) owing to its delicate structure design and electronic configuration tuning. Both experimental and theoretical approaches were used to systematically investigate the influence of the central electron‐deficient core on the properties of the acceptor and device performance. The electron‐deficient core modulation paves a new pathway in the molecular engineering of NFAs, propelling relevant research forward.

Funder

Ministry of Science and Technology of the People's Republic of China

National Natural Science Foundation of China

Youth Innovation Promotion Association of the Chinese Academy of Sciences

Natural Science Foundation of Tianjin Municipality

Higher Education Discipline Innovation Project

Fundamental Research Funds for Central Universities of the Central South University

Nankai University

Natural Science Foundation Project of Chongqing

Publisher

Wiley

Subject

General Medicine

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