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Authors: Tries, Alexander
Osella, Silvio
Zhang, Pengfei
Xu, Fugui
Ramanan, Charusheela
Kläui, Mathias
Mai, Yiyong
Beljonne, David
Wang, Hai I.
Title: Experimental observation of strong exciton effects in graphene nanoribbons
Online publication date: 20-Oct-2020
Language: english
Abstract: 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.
DDC: 530 Physik
530 Physics
Institution: Johannes Gutenberg-Universität Mainz
Department: FB 08 Physik, Mathematik u. Informatik
Place: Mainz
Version: Accepted version
Publication type: Zeitschriftenaufsatz
Document type specification: Scientific article
License: In Copyright
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Journal: Nano letters
Pages or article number: 2993
Publisher: ACS Publ.
Publisher place: Washington, DC
Issue date: 2020
ISSN: 1530-6984
Publisher URL:
Publisher DOI: 10.1021/acs.nanolett.9b04816
Appears in collections:JGU-Publikationen

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