Please use this identifier to cite or link to this item:
http://doi.org/10.25358/openscience-5154
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 |
Year of first publication: | 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 |
ROR: | https://ror.org/023b0x485 |
DOI: | http://doi.org/10.25358/openscience-5154 |
Version: | Accepted version |
Publication type: | Zeitschriftenaufsatz |
Document type specification: | Scientific article |
License: | In Copyright |
Information on rights of use: | https://rightsstatements.org/vocab/InC/1.0/ |
Journal: | Nano letters 20 5 |
Pages or article number: | 2993 3002 |
Publisher: | ACS Publ. |
Publisher place: | Washington, DC |
Issue date: | 2020 |
ISSN: | 1530-6984 |
Publisher URL: | https://www.doi.org/10.1021/acs.nanolett.9b04816 |
Publisher DOI: | 10.1021/acs.nanolett.9b04816 |
Appears in collections: | JGU-Publikationen |
Files in This Item:
File | Description | Size | Format | ||
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tries_alexander-experimental_o-20200930085522125.pdf | 1.01 MB | Adobe PDF | View/Open |