Charge Transfer and Aggregation Effects on the Performance of Planar vs Twisted Nonfullerene Acceptor Isomers for Organic Solar Cells
| Autor: | Wei Chen, Theodore Goodson, Paul M. Zimmerman, Valerii Sharapov, Luping Yu, Donglin Zhao, Hyungjun Kim, Ifeanyi K. Madu, Benedetta Carlotti, Zhengxu Cai |
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| Jazyk: | angličtina |
| Rok vydání: | 2018 |
| Předmět: |
Materials Chemistry2506 Metals and Alloys
Materials science Organic solar cell General Chemical Engineering Chemistry (all) Chemical Engineering (all) 02 engineering and technology 010402 general chemistry Photochemistry 01 natural sciences chemistry.chemical_compound Diimide Materials Chemistry Structural isomer chemistry.chemical_classification technology industry and agriculture General Chemistry Electron acceptor 021001 nanoscience & nanotechnology Acceptor 0104 chemical sciences Photoexcitation chemistry Intramolecular force 0210 nano-technology Perylene |
| Popis: | Newly synthesized perylene diimide dimers were investigated as nonfullerene electron acceptors for organic solar cells. In particular, two analogous positional isomers exhibiting twisted vs planar geometries were prepared to make a direct comparison of their optical and electronic properties. These properties were investigated to provide information regarding the impact of the nonfullerene acceptor geometry on the ultimate photovoltaic performance. The two isomers exhibited strikingly different optical and photophysical properties in solution as well as in film. The ultrafast spectroscopic investigation in solution revealed the occurrence of charge transfer upon photoexcitation, which takes place more efficiently in the planar isomer. This is also supported by theoretical simulations. The planar conformation exhibits higher aggregation in the neat film as well as in the blend. However, our results suggest that the dominance of intramolecular charge transfer in the planar isomer is the crucial factor in de... |
| Databáze: | OpenAIRE |
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