Nonfullerene Acceptor Featuring Unique Self‐Regulation Effect for Organic Solar Cells with 19 % Efficiency

Author:

Liu Feng12ORCID,Jiang Yuanyuan13,Xu Renjie1,Su Wenli4,Wang Shijie5,Zhang Yaogang13,Liu Kerui13,Xu Shengjie1,Zhang Wenkai4,Yi Yuanping13,Ma Wei5,Zhu Xiaozhang13ORCID

Affiliation:

1. Beijing National Laboratory for Molecular Sciences, CAS Key Laboratory for Organic Solids, Institute of Chemistry Chinese Academy of Sciences Beijing 100190 China

2. School of Chemistry and Chemical Engineering Shanxi University Taiyuan 030006 China

3. School of Chemical Sciences University of Chinese Academy of Sciences Beijing 100049 China

4. Department of Physics and Applied Optics Beijing Area Major Laboratory, Center for Advanced Quantum Studies Beijing Normal University Beijing 100875 China

5. State Key Laboratory for Mechanical Behavior of Materials Xi'an Jiaotong University Xi'an 710049 China

Abstract

AbstractThe blend nanomorphology of electron‐donor (D) and ‐acceptor (A) materials is of vital importance to achieving highly efficient organic solar cells. Exogenous additives especially aromatic additives are always needed to further optimize the nanomorphology of blend films, which is hardly compatible with industrial manufacture. Herein, we proposed a unique approach to meticulously modulate the aggregation behavior of NFAs in both crystal and thin film nanomorphology via self‐regulation effect. Nonfullerene acceptor Z9 was designed and synthesized by tethering phenyl groups on the inner side chains of the Y6 backbone. Compared with Y6, the tethered phenyl groups participated in the molecular aggregation via the π–π stacking of phenyl‐phenyl and phenyl‐2‐(5,6‐difluoro‐3‐oxo‐2,3‐dihydro‐1H‐inden‐1‐ylidene)malononitrile (IC‐2F) groups, which induced 3D charge transport with phenyl‐mediated super‐exchange electron coupling. Moreover, ordered molecular packing with suitable phase separation was observed in Z9‐based blend films. High power conversion efficiencies (PCEs) of 19.0 % (certified PCE of 18.6 %) for Z9‐based devices were achieved without additives, indicating the great potential of the self‐regulation strategy in NFA design.

Funder

Natural Science Foundation of Beijing Municipality

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

National Natural Science Foundation of China

Chinese Academy of Sciences

Shanxi Provincial Science and Technology Department

Publisher

Wiley

Subject

General Chemistry,Catalysis

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