Hot-Carrier Seebeck Effect: Diffusion and Remote Detection of Hot Carriers in Graphene

Juan F. Sierra, Ingmar Neumann, Marius V. Costache, Sergio O. Valenzuela

    Research output: Contribution to journalArticleResearchpeer-review

    22 Citations (Scopus)

    Abstract

    © 2015 American Chemical Society. We investigate hot carrier propagation across graphene using an electrical nonlocal injection/detection method. The device consists of a monolayer graphene flake contacted by multiple metal leads. Using two remote leads for electrical heating, we generate a carrier temperature gradient that results in a measurable thermoelectric voltage VNL across the remaining (detector) leads. Due to the nonlocal character of the measurement, VNL is exclusively due to the Seebeck effect. Remarkably, a departure from the ordinary relationship between Joule power P and VNL, VNL ∼ P, becomes readily apparent at low temperatures, representing a fingerprint of hot-carrier dominated thermoelectricity. By studying VNL as a function of bias, we directly determine the carrier temperature and the characteristic cooling length for hot-carrier propagation, which are key parameters for a variety of new applications that rely on hot-carrier transport. (Figure Presented).
    Original languageEnglish
    Pages (from-to)4000-4005
    JournalNano Letters
    Volume15
    Issue number6
    DOIs
    Publication statusPublished - 10 Jun 2015

    Keywords

    • Graphene
    • Seebeck effect
    • electron?phonon interaction
    • hot carriers
    • supercollisions

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