Correlating the electron-donating core structure with morphology and performance of carbon oxygen-bridged ladder-type non-fullerene acceptor based organic solar cells
| Autor: | Onkar Game, Robert S. Gurney, Emma L. K. Spooner, Wei Li, Joel A. Smith, Rachel C. Kilbride, Mengxue Chen, Dan Liu, Zuo Xiao, Jinlong Cai, David G. Lidzey, Liming Ding, X. J. Meng, Richard A. L. Jones, Huijun Zhang, Tao Wang, Donghui Li |
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| Rok vydání: | 2019 |
| Předmět: |
Materials science
Fullerene Organic solar cell Renewable Energy Sustainability and the Environment Band gap 02 engineering and technology Crystal structure 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences Acceptor 0104 chemical sciences law.invention chemistry.chemical_compound Crystallography chemistry law Thiophene General Materials Science Lamellar structure Electrical and Electronic Engineering Crystallization 0210 nano-technology |
| Zdroj: | Spooner, E L K, Game, O S, Gurney, R S, Jones, R A L, Lidzey, D G & Wang, T 2019, ' Correlating the electron-donating core structure with morphology and performance of carbon–oxygen-bridged ladder-type non-fullerene acceptor based organic solar cells ', Nano Energy . https://doi.org/10.1016/j.nanoen.2019.04.053 |
| ISSN: | 2211-2855 |
| DOI: | 10.1016/j.nanoen.2019.04.053 |
| Popis: | The chemical structure of non-fullerene acceptors (NFAs) affects their light-harvesting capabilities, energy levels and molecular orders, all of which play a crucial role in determining the efficiency of organic solar cells (OSCs). In this work, we have systematically investigated a series of ladder-type NFAs having different carbon-oxygen-bridged electron-donating cores, and revealed the effects of core structures and film casting conditions on molecular ordering and performance of OSCs. We found that NFAs containing the thieno [3,2-b]thiophene centered, 6 or 8 fused rings (i.e. COi6DFIC, COi8DFIC) exhibit narrower optical band gaps than NFAs containing the benzene centered, 5 or 7 fused rings (i.e. COi5DFIC, COi7DFIC). NFAs containing less fused rings in the carbon-oxygen-bridged core (i.e. COi5DFIC and COi6DFIC) exhibit edge-on molecular orientation in the blends with face-on oriented PTB7-Th donor, and result in low device efficiency. Although NFAs containing more fused rings (i.e. COi7DFIC and COi8DFIC) possess a pronounced flat-on lamellar crystalline structure in the pure state, the crystallization can be reduced when blending with PTB7-Th and under hot-substrate casting, while the lamella in COi8DFIC can be effectively suppressed to form face-on H- and J-type aggregates, leading to enhanced efficiency. |
| Databáze: | OpenAIRE |
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