Journal
NANO LETTERS
Volume 20, Issue 5, Pages 2993-3002Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.nanolett.9b04816
Keywords
Graphene nanoribbons; Excitons; Exciton formation; Exciton binding energy; THz spectroscopy
Categories
Funding
- DFG [SPP 1459, SFB TRR 173 Spin+X]
- Max Planck Society
- Excellence Initiative by the Graduate School Materials Science in Mainz [GSC 266]
- National Natural Science Foundation of China [21774076]
- Program of Shanghai Academic Research Leader [19XD1421700]
- Interdisciplinary Center for Mathematical and Computational Modelling (ICM, University of Warsaw) [GA53-8, GA73-16, GA76-5]
- FNRS-FRFC
- Consortium des Equipements de Calcul Intensif CECI
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Graphene nanoribbons (GNRs) with atomically precise width and edge structures are a promising class of nanomaterials for optoelectronics, thanks to their semiconducting nature and high mobility of charge carriers. Understanding the fundamental static optical properties and ultrafast dynamics of charge carrier generation in GNRs is essential for optoelectronic applications. Combining THz spectroscopy and theoretical calculations, we report a strong exciton effect with binding energy up to similar to 700 meV in liquid-phase-dispersed GNRs with a width of 1.7 nm and an optical band gap of similar to 1.6 eV, illustrating the intrinsically strong Coulomb interactions between photogenerated electrons and holes. By tracking the exciton dynamics, we reveal an ultrafast formation of excitons in GNRs with a long lifetime over 100 ps. Our results not only reveal fundamental aspects of excitons in GNRs (strong binding energy and ultrafast exciton formation etc.) but also highlight promising properties of GNRs for optoelectronic devices.
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