Dynamics of photoexcited carriers in monolayer epitaxial graphene probed by photoluminescence in the near-infrared region

Takeshi Koyama, Yoshito Ito, Kazuma Yoshida, Hiroki Ago, Arao Nakamura

    Research output: Chapter in Book/Report/Conference proceedingConference contribution

    Abstract

    We investigate the dynamics of photoexcited carriers in a single monolayer graphene at room temperature in air by femtosecond time-resolved luminescence measurements. The luminescence kinetics observed in the near-infrared region from 0.7 to 0.9 eV are analyzed based on the two-temperature model describing the cooling of thermalized carriers due to the carrier-optical-phonon coupling. The observed luminescence kinetics are well reproduced by the model, though the calculated electron temperature increases only to ∼420 K at the maximum, which is much lower than the optical phonon energies. This indicates the predominance of optical phonons over acoustic phonons in the carrier-phonon interaction even at a temperature of ∼400 K.

    Original languageEnglish
    Title of host publicationPhysics of Semiconductors - Proceedings of the 31st International Conference on the Physics of Semiconductors, ICPS 2012
    PublisherAmerican Institute of Physics Inc.
    Pages167-168
    Number of pages2
    ISBN (Print)9780735411944
    DOIs
    Publication statusPublished - Jan 1 2013
    Event31st International Conference on the Physics of Semiconductors, ICPS 2012 - Zurich, Switzerland
    Duration: Jul 29 2012Aug 3 2012

    Publication series

    NameAIP Conference Proceedings
    Volume1566
    ISSN (Print)0094-243X
    ISSN (Electronic)1551-7616

    Other

    Other31st International Conference on the Physics of Semiconductors, ICPS 2012
    CountrySwitzerland
    CityZurich
    Period7/29/128/3/12

    Fingerprint

    graphene
    photoluminescence
    luminescence
    phonons
    kinetics
    electron energy
    cooling
    temperature
    acoustics
    air
    room temperature
    interactions
    energy

    All Science Journal Classification (ASJC) codes

    • Ecology, Evolution, Behavior and Systematics
    • Ecology
    • Plant Science
    • Physics and Astronomy(all)
    • Nature and Landscape Conservation

    Cite this

    Koyama, T., Ito, Y., Yoshida, K., Ago, H., & Nakamura, A. (2013). Dynamics of photoexcited carriers in monolayer epitaxial graphene probed by photoluminescence in the near-infrared region. In Physics of Semiconductors - Proceedings of the 31st International Conference on the Physics of Semiconductors, ICPS 2012 (pp. 167-168). (AIP Conference Proceedings; Vol. 1566). American Institute of Physics Inc.. https://doi.org/10.1063/1.4848338

    Dynamics of photoexcited carriers in monolayer epitaxial graphene probed by photoluminescence in the near-infrared region. / Koyama, Takeshi; Ito, Yoshito; Yoshida, Kazuma; Ago, Hiroki; Nakamura, Arao.

    Physics of Semiconductors - Proceedings of the 31st International Conference on the Physics of Semiconductors, ICPS 2012. American Institute of Physics Inc., 2013. p. 167-168 (AIP Conference Proceedings; Vol. 1566).

    Research output: Chapter in Book/Report/Conference proceedingConference contribution

    Koyama, T, Ito, Y, Yoshida, K, Ago, H & Nakamura, A 2013, Dynamics of photoexcited carriers in monolayer epitaxial graphene probed by photoluminescence in the near-infrared region. in Physics of Semiconductors - Proceedings of the 31st International Conference on the Physics of Semiconductors, ICPS 2012. AIP Conference Proceedings, vol. 1566, American Institute of Physics Inc., pp. 167-168, 31st International Conference on the Physics of Semiconductors, ICPS 2012, Zurich, Switzerland, 7/29/12. https://doi.org/10.1063/1.4848338
    Koyama T, Ito Y, Yoshida K, Ago H, Nakamura A. Dynamics of photoexcited carriers in monolayer epitaxial graphene probed by photoluminescence in the near-infrared region. In Physics of Semiconductors - Proceedings of the 31st International Conference on the Physics of Semiconductors, ICPS 2012. American Institute of Physics Inc. 2013. p. 167-168. (AIP Conference Proceedings). https://doi.org/10.1063/1.4848338
    Koyama, Takeshi ; Ito, Yoshito ; Yoshida, Kazuma ; Ago, Hiroki ; Nakamura, Arao. / Dynamics of photoexcited carriers in monolayer epitaxial graphene probed by photoluminescence in the near-infrared region. Physics of Semiconductors - Proceedings of the 31st International Conference on the Physics of Semiconductors, ICPS 2012. American Institute of Physics Inc., 2013. pp. 167-168 (AIP Conference Proceedings).
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