20.2% Efficiency Organic Photovoltaics Employing a π‐Extension Quinoxaline‐Based Acceptor with Ordered Arrangement

Author:

Chen Zhenyu12,Ge Jinfeng1,Song Wei1,Tong Xinyu12,Liu Hui1,Yu Xueliang1,Li Jing3,Shi Jingyu12,Xie Lin1,Han Chengcheng1,Liu Quan1,Ge Ziyi12ORCID

Affiliation:

1. Zhejiang Provincial Engineering Research Center of Energy Optoelectronic Materials and Devices Ningbo Institute of Materials Technology & Engineering Chinese Academy of Sciences Ningbo 315201 China

2. Center of Materials Science and Optoelectronics Engineering University of Chinese Academy of Sciences Beijing 100049 P. R. China

3. Key Laboratory of Photochemical Conversion and Optoelectronic Materials Technical Institute of Physics and Chemistry Chinese Academy of Sciences Beijing 100190 China

Abstract

AbstractOrganic solar cells, as a cutting‐edge sustainable renewable energy technology, possess a myriad of potential applications, while the bottleneck problem of less than 20% efficiency limits the further development. Simultaneously achieving an ordered molecular arrangement, appropriate crystalline domain size, and reduced nonradiative recombination poses a significant challenge and is pivotal for overcoming efficiency limitations. This study employs a dual strategy involving the development of a novel acceptor and ternary blending to address this challenge. A novel non‐fullerene acceptor, SMA, characterized by a highly ordered arrangement and high lowest unoccupied molecular orbital energy level, is synthesized. By incorporating SMA as a guest acceptor in the PM6:BTP‐eC9 system, it is observed that SMA staggered the liquid‐solid transition of donor and acceptor, facilitating acceptor crystallization and ordering while maintaining a suitable domain size. Furthermore, SMA optimized the vertical morphology and reduced bimolecular recombination. As a result, the ternary device achieved a champion efficiency of 20.22%, accompanied by increased voltage, short‐circuit current density, and fill factor. Notably, a stabilized efficiency of 18.42% is attained for flexible devices. This study underscores the significant potential of a synergistic approach integrating acceptor material innovation and ternary blending techniques for optimizing bulk heterojunction morphology and photovoltaic performance.

Funder

National Science Fund for Distinguished Young Scholars

National Natural Science Foundation of China

Publisher

Wiley

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