Asymmetric Alkoxy and Alkyl Substitution on Nonfullerene Acceptors Enabling High‐Performance Organic Solar Cells
Abstract
In this paper, a strategy of asymmetric alkyl and alkoxy substitution is applied to state‐of‐the‐art Y‐series nonfullerene acceptors (NFAs), and it achieves great performance in organic solar cell (OSC) devices. Since alkoxy groups can have a significant influence on the material properties of NFAs, alkoxy substitution is applied to the Y6 molecule in a symmetric manner. The resulting molecule (named Y6‐2O), despite showing improved open‐circuit voltage (Voc), yields extremely poor performance due to low solubility and excessive aggregation properties, a change that is due to the conformational locking effect of alkoxy groups. In contrast, asymmetric alkyl and alkoxy substitution on Y6, yields a molecule named Y6‐1O that can maintain the positive effect of Voc improvement and obtain reasonably good solubility. The resulting molecule Y6‐1O enables highly efficient nonfullerene OSCs with 17.6% efficiency and the asymmetric side‐chain strategy has the potential to be applied to other NFA‐material systems to further improve their performance.
Document Details
- Document Type
- Pub Defense Publication
- Publication Date
- Nov 30, 2020
- Source ID
- 10.1002/aenm.202003141
Entities
People
- Fei Huang
- Feng Liu
- Fujin Bai
- Ha Kyung Kim
- Han Yu
- Harald Ade
- He Yan
- Jianquan Zhang
- Jie Zhang
- Jun Yuan
- Lei Zhu
- Lik‐kuen Ma
- Philip C Y Chow
- Xinhui Zou
- Yingping Zou
- Yunpeng Qin
- Yuzhong Chen
- Zhengxing Peng
Organizations
- Central South University
- Hong Kong University of Science and Technology
- Innovation and Technology Commission
- Ministry of Science and Technology of the People's Republic of China
- National Natural Science Foundation of China
- North Carolina State University
- Office of Basic Energy Sciences
- Office of Naval Research
- Office of Science
- Program 973
- Shanghai Jiao Tong University
- United States Department of Energy
- Yusuf Hamied Department of Chemistry