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/lp/wiley/the-crystalline-behavior-and-device-function-of-nonfullerene-acceptors-79FumFm445
- Publisher
- Wiley
- Copyright
- © 2022 Wiley‐VCH GmbH
- ISSN
- 1614-6832
- eISSN
- 1614-6840
- DOI
- 10.1002/aenm.202201338
- Publisher site
- See Article on Publisher Site
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.
Journal
Advanced Energy Materials – Wiley
Published: Sep 1, 2022
Keywords: crystal structure; intermolecular interaction; morphology; nonfullerene acceptor; organic photovoltaics