Hot-carrier photocurrent effects at graphene-metal interfaces

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.

References in corpus (12)

• Making graphene visible
• Photo-excitation Cascade and Multiple Carrier Generation in Graphene
• Ultrafast Photoluminescence from Graphene
• Intrinsic response time of graphene photodetectors
• Supercollision cooling in undoped graphene
• Semiconducting-to-metallic photoconductivity crossover and temperature-dependent Drude weight in graphene
• Extreme sensitivity of graphene photoconductivity to environmental gases
• Competing Ultrafast Energy Relaxation Pathways in Photoexcited Graphene
• Photo-excited Carrier Dynamics and Impact Excitation Cascade in Graphene
• Competing Channels for Hot Electron Cooling in Graphene
• Observation of suppressed terahertz absorption in photoexcited graphene
• Substrate Sensitive Mid-Infrared Photoresponse in Graphene

Cited by in corpus (13)

• Ultrafast intrinsic optical-to-electrical conversion dynamics in graphene photodetector
• Extraordinary linear dynamic range in laser-defined functionalized graphene photodetectors
• Light-Driven Nanoscale Vectorial Currents
• Plasmonic graphene photodetector based on channel photo-thermoelectric effect
• Zero-bias photodetection in 2d materials via geometric design of contacts
• Tunable Ultrafast Thermal Relaxation in Graphene Measured by Continuous-Wave Photomixing
• Photo-Nernst detection of cyclotron resonance in partially irradiated graphene
• Polarization-resolving graphene-based mid-infrared detector
• Photo-accelerated water dissociation across one-atom-thick electrodes
• Theory of the effective Seebeck coefficient for photoexcited 2D materials: the case of graphene
• Photon drag at the junction between metal and 2d semiconductor
• Intrinsic ultrafast edge photocurrent dynamics in WTe${}_2$ driven by broken crystal symmetry
• Exact theory of edge diffraction and launching of transverse electric plasmons at two-dimensional junctions