Hot-carrier photocurrent effects at graphene–metal interfaces

2014/11/20 by K. J. Tielrooij, K J Tielrooij, M. Massicotte +13 · 92 citations
Materials Science · Physics and Astronomy · #2D Materials and Applications #Electron #Graphene #Graphene research and applications #Photoconductivity #Photocurrent #Photoexcitation #Photon energy #Topological Materials and Phenomena #Ultrashort pulse #cond-mat.mes-hall

paper · pdf · doi:10.1088/0953-8984/27/16/164207

published in Journal of Physics Condensed Matter 27(16), 164207 (IOP Publishing)

arxiv created 2014/11/20 · openalex publication_date 2015/04/02 · arxiv updated 2015/04/24 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/06

Abstract

Photoexcitation of graphene leads to an interesting sequence of phenomena, some of which can be exploited in optoelectronic devices based on graphene. In particular, the efficient and ultrafast generation of an electron distribution with an elevated electron temperature and the concomitant generation of a photo-thermoelectric voltage at symmetry-breaking interfaces is of interest for photosensing and light harvesting. Here, we experimentally study the generated photocurrent at the graphene-metal interface, focusing on the time-resolved photocurrent, the effects of photon energy, Fermi energy and light polarization. We show that a single framework based on photo-thermoelectric photocurrent generation explains all experimental results.

Citations

• Snapshots of non-equilibrium Dirac carrier distributions in graphene
• Photoexcited carrier dynamics and impact-excitation cascade in graphene
• Electronic transport in two-dimensional graphene
• Hot Carrier–Assisted Intrinsic Photoresponse in Graphene
• Making graphene visible

Cited by

• Slow Noncollinear Coulomb Scattering in the Vicinity of the Dirac Point in Graphene
• Interface defect-assisted phonon scattering of hot carriers in graphene