Experimental Observation of Strong Exciton Effects in Graphene Nanoribbons

Experimental Observation of Strong Exciton Effects in Graphene Nanoribbons

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 char...

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Veröffentlicht in:Nano letters 2020-05, Vol.20 (5), p.2993-3002
Hauptverfasser: Tries, Alexander, Osella, Silvio, Zhang, Pengfei, Xu, Fugui, Ramanan, Charusheela, Kläui, Mathias, Mai, Yiyong, Beljonne, David, Wang, Hai I
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container_end_page 3002
container_issue 5
container_start_page 2993
container_title Nano letters
container_volume 20
creator Tries, Alexander
Osella, Silvio
Zhang, Pengfei
Xu, Fugui
Ramanan, Charusheela
Kläui, Mathias
Mai, Yiyong
Beljonne, David
Wang, Hai I
description 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 ∼700 meV in liquid-phase-dispersed GNRs with a width of 1.7 nm and an optical band gap of ∼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.
doi_str_mv 10.1021/acs.nanolett.9b04816
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title Experimental Observation of Strong Exciton Effects in Graphene Nanoribbons
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