The Crystalline Behavior and Device Function of Nonfullerene Acceptors in Organic Solar Cells
Abstract
The current research investigates the structure features and intermolecular interactions of nonfullerene acceptors (NFAs) in single crystal and thin films, as well as their solar cell applications. Guiding parameters and key intermolecular forces that lead to 2D brickwork or 3D web packing are identified. The atomic modification is shown as the key to induce hydrogen bonding or π–π stacking column, which results in different crystalline packing. The molecular assembly in thin film is initiated by hydrogen bonding, and completed by π–π stacking reorganization. The packing energy is seen as a guiding parameter that dictates the NFA crystalline morphology in blended thin films. The crystalline packing motif is not directly related with device efficiency. However, the crystalline morphology is the key parameter to influence exciton/carrier dynamics and device performance. A broader picture on the scaling behavior of organic semiconductor crystals ranging from oligoacenes to NFAs is established.
Document Details
- Document Type
- Pub Defense Publication
- Publication Date
- Jul 22, 2022
- Source ID
- 10.1002/aenm.202201338
Entities
People
- Alex K.‐y. Jen
- Feng Liu
- Francis Lin
- Gang Wei
- Guanqing Zhou
- Jinqiu Xu
- Ke Gao
- Lei Zhu
- Ming Zhang
- Tianyu Hao
- Yecheng Zou
- Yongming Zhang
- Yuanping Yi
Organizations
- City University of Hong Kong
- National Natural Science Foundation of China
- Natural Science Foundation of Shandong Province
- Office of Naval Research
- Office of Science
- Royal Institute of Chemistry
- Shandong University
- Shanghai Jiao Tong University
- United States Department of Energy
- University of Washington