Regulating the properties of small molecular acceptors with different end groups
| Autor: | Qingya Wei, Hongjian Peng, Yingping Zou, Jiage Song, Honggang Chen, Jing Li, Jun Yuan |
|---|---|
| Rok vydání: | 2021 |
| Předmět: |
chemistry.chemical_classification
Benzotriazole Materials science Renewable Energy Sustainability and the Environment Solar spectra 020209 energy 02 engineering and technology 021001 nanoscience & nanotechnology Acceptor chemistry.chemical_compound End-group Crystallography chemistry Absorption band 0202 electrical engineering electronic engineering information engineering General Materials Science 0210 nano-technology Absorption (electromagnetic radiation) Isopropyl Alkyl |
| Zdroj: | Solar Energy. 223:100-105 |
| ISSN: | 0038-092X |
| DOI: | 10.1016/j.solener.2021.05.051 |
| Popis: | In this work, we designed and synthesized two small molecular acceptors, based on benzotriazole (BTA) as the center core with isopropyl alkyl chain, thienothiophene unit (TT) β-position connected n-hexane alkyl chain as wing, and using different end groups, 2-(3-oxygen generation-2, 3-2H − 1H-indane-1-alkyl)-malononitrile (IC) and 2-(5,6-difluoro-3-oxo-2,3-dihydro-1H-indane-1-alkylene) (2FIC), named BIT-IC and BIT-2FIC, respectively. The device based on PM6: BIT-IC achieved the PCE of 3.63%, which exhibited inferior performance because the device absorption is not complementary with solar spectrum, leading to the low Jsc of the device. However, the absorption band of the acceptor BIT-2FIC with 2FIC end group can reach 944 nm, and the HOMO energy level is lower than BIT-IC, therefore, the device based on PM6: BIT-2FIC can achieve more efficient exciton dissociation and charge transport, after thermal annealing treatment at 90 °C for 10 min, the device based on PM6: BIT-2FIC can achieve the PCE over 14%. |
| Databáze: | OpenAIRE |
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