High‐Efficiency Binary and Ternary Organic Solar Cells Based on Novel Nonfused‐Ring Electron Acceptors

Author:

Lu Hao12,Liu Wenlong3,Ran Guangliu4,Li Jingyi3,Li Dawei3,Liu Yahui2,Xu Xinjun3,Zhang Wenkai4,Bo Zhishan123ORCID

Affiliation:

1. College of Materials Science and Engineering Qingdao University Qingdao 266071 China

2. College of Textiles & Clothing State Key Laboratory of Bio‐Fibers and Eco‐Textiles Qingdao University Qingdao 266071 China

3. Beijing Key Laboratory of Energy Conversion and Storage Materials College of Chemistry Beijing Normal University Beijing 100875 China

4. Department of Physics and Applied Optics Beijing Area Major Laboratory Beijing Normal University Beijing 100875 China

Abstract

AbstractIn this study, three nonfused‐ring electron acceptors (2TT, 2TT‐C6‐F, and 2TT‐C11‐F) with the same steric hindrance groups (2,4,6‐tripropylbenzene) are designed and synthesized and the impact of electron‐withdrawing and lateral alkyl side chains on the performance of binary and ternary organic solar cells (OSCs) is explored. For the binary OSCs, 2TT‐C11‐F with IC‐2F terminal groups and lateral undecyl side chains display a red shifted absorption spectrum and suitable energy levels, and the corresponding blend film exhibits appropriate phase separation and crystallinity. Thus, binary OSCs based on 2TT‐C11‐F achieve an impressive power conversion efficiency of 13.03%, much higher than the efficiencies of those based on 2TT (9.68%) and 2TT‐C6‐F (12.11%). In the ternary OSCs, 2TT with CC terminal groups and lateral hexyl side chains exhibit complementary absorption and cascade energy levels with a host binary system (D18:BTP‐eC9‐4F). Hence, the ternary OSCs based on 2TT achieve a remarkable efficiency of 19.39%, ranking among the highest reported values. The research yields comprehensive 2TT‐series nonfused‐ring electron acceptors, demonstrating their great potential for the fabrication of high‐performance binary and ternary OSCs.

Funder

National Natural Science Foundation of China

Natural Science Foundation of Shandong Province

Publisher

Wiley

Subject

Mechanical Engineering,Mechanics of Materials,General Materials Science

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