Picosecond photoresponse in van der Waals heterostructures

Abstract

Two-dimensional (2D) crystals, such as graphene and transition metal dichalcogenides (TMDs), present a collection of unique and complementary optoelectronic properties. Assembling different 2D materials in vertical heterostructures enables the combination of these properties in one device, thus creating multi-functional optoelectronic systems with superior performance. Here we demonstrate that graphene/WSe2/graphene heterostructures ally the high photodetection efficiency of TMDs with a picosecond photoresponse comparable to that of graphene, thereby optimizing both speed and efficiency in a single photodetector. We follow in time the extraction of photoexcited carriers in these devices using time-resolved photocurrent measurements and demonstrate a photoresponse time as short as 5.5 ps, which we tune by applying a bias and by varying the TMD layer thickness. Our study provides direct insight into the physical processes governing the detection speed and quantum efficiency of these van der Waals (vdW) heterostuctures, such as out-of-plane carrier drift and recombination. The observation and understanding of ultrafast and efficient photodetection demonstrate the potential of hybrid TMD-based heterostructures as a platform for future optoelectronic devices.

References in corpus (11)

• Atomically thin p-n junctions with van der Waals heterointerfaces
• Waveguide-integrated black phosphorus photodetector with high responsivity and low dark current
• Mechanisms of photoconductivity in atomically thin MoS2
• Ultrafast Dynamics of Defect-Assisted Electron-Hole Recombination in Monolayer MoS2
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• Nonlinear Photoluminescence in Atomically Thin Layered WSe2 Arising from Diffusion-Assisted Exciton-Exciton Annihilation
• Electric field induced strong enhancement of electroluminescence in multi-Layer MoS2
• Infrared Reflectance Spectrum of BN Calculated from First Principles
• High Intrinsic Mobility and Ultrafast Carrier Dynamics in Multilayer Metal Dichalcogenide MoS2
• Charge photogeneration in few-layer MoS2

Cited by in corpus (74)

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• Magnetic structure and phase stability of the van der Waals bonded ferromagnet Fe3-xGeTe2
• Near-direct bandgap $WS{e}_2$/$Re{S}_2$ type-II pn heterojunction for enhanced ultrafast photodetection and high-performance photovoltaics
• Photo-thermionic effect in vertical graphene heterostructures
• Ultrafast Exciton Dissociation and Long-Lived Charge Separation in a Photovoltaic Pentacene MoS2 van der Waals Heterojunction
• Fast multicolor photodetectors based on graphene-contacted p-GaSe/n-InSe van der Waals heterostructures
• Interlayer excitons and Band Alignment in MoS${}_2$/hBN/WSe${}_2$ van der Waals Heterostructures
• Enhanced Light-Matter Interaction in Two-Dimensional Transition Metal Dichalcogenides
• Out-of-plane heat transfer in van der Waals stacks: electron-hyperbolic phonon coupling
• Dissociation of two-dimensional excitons in monolayer WSe2
• 2D MoS2-Graphene-based multilayer van der Waals heterostructures: Enhanced charge transfer and optical absorption, and electric-field tunable Dirac point and band gap
• Proximity effects in bilayer graphene on monolayer WSe${}_2$: Field-effect spin-valley locking, spin-orbit valve, and spin transistor
• Photocurrent as a multi-physics diagnostic of quantum materials
• Device physics of van der Waals heterojunction solar cells
• Filtering the photoluminescence spectra of atomically thin semiconductors with graphene
• Thermal expansion and transport in van der Waals solids from first-principles calculations
• Ultrafast Radiative Heat Transfer
• A WSe2 vertical field emission transistor
• Long-Lived Charge Separation Following Pump-Energy Dependent Ultrafast Charge Transfer in Graphene/WS${}_2$ Heterostructures
• Ultrafast intrinsic optical-to-electrical conversion dynamics in graphene photodetector
• Imaging of interlayer coupling in van der Waals heterostructures using a bright-field optical microscope
• Near-unity light absorption in a monolayer WS2 van der Waals heterostructure cavity
• Charge versus energy transfer in atomically-thin graphene-transition metal dichalcogenide van der Waals heterostructures
• 2D condensate of electrons and holes in ultrathin MoTe${}_2$ photocells
• Exciton optics, dynamics and transport in atomically thin semiconductors
• Mapping of the dark exciton landscape in transition metal dichalcogenides
• Gate Tunable Photovoltaic Effect in MoS2 vertical P-N Homostructures
• Highly Sensitive MoS2 Photodetectors with Graphene Contacts
• Nano-photocurrent mapping of local electronic structure in twisted bilayer graphene
• Scalable Fabrication of Atomically Thin Monolayer MoS2 Photodetectors
• Unique excitonic effects in tungsten disulphide monolayers on two-layer graphene
• Microscopic understanding of ultrafast charge transfer in van-der-Waals heterostructures
• Two-dimensional Platinum Diselenide Waveguide-Integrated Infrared Photodetectors
• Mechanical and liquid phase exfoliation of cylindrite: a natural van der Waals superlattice with intrinsic magnetic interactions
• Twistronics in graphene-based van der Waals structures
• Charge Separation at Mixed-Dimensional Single and Multilayer MoS2/Silicon Nanowire Heterojunctions
• Picosecond energy transfer in a transition metal dichalcogenide-graphene heterostructure revealed by transient Raman spectroscopy
• Graphene Plasmonic Fractal Metamaterials for Broadband Photodetectors
• Highly Sensitive, Fast Graphene Photodetector with Responsivity $>10^6$ A/W Using Floating Quantum Well Gate
• Light emission from the layered metal 2H-TaSe${}_2$ and its potential applications
• Fast Yet Quantum-Efficient Few-Layer Vertical MoS2 Photodetectors
• Tailoring Semiconductor Lateral Multi-junctions for Giant Photoconductivity Enhancement
• Sub-ns intrinsic response time of PbS nanocrystal IR-photodetectors
• Photoresponsivity enhancement in monolayer MoS${}_2$ by rapid O${}_2$:Ar plasma treatment
• Zero-bias photodetection in 2d materials via geometric design of contacts
• Signatures of sub-band excitons in few-layer black phosphorus
• Infrared photodetectors based on graphene van der Waals heterostructures
• Ultrafast photocurrent and absorption microscopy of few-layer TMD devices isolate rate-limiting dynamics driving fast and efficient photoresponse
• Effect of doping on the characteristics of infrared photodetectors based on van der Waals~heterostructures with multiple graphene layers
• Spatiotemporal Imaging of Thickness-Induced Band Bending Junctions
• Phonon-assisted Exciton Dissociation in Transition Metal Dichalcogenides
• Multiple negative differential conductance regions and inelastic phonon assisted tunneling in graphene-hBN-graphene structures
• A primer on twistronics: A massless Dirac fermion's journey to moiré patterns and flat bands in twisted bilayer graphene
• Plasmon-assisted resonant tunneling in graphene-based heterostructures
• General theoretical description of angle-resolved photoemission spectroscopy of van der Waals structures
• Reduced absorption due to defect-localized interlayer excitons in transition metal dichalcogenide-graphene heterostructures
• Multifunctional 2d infrared photodetectors enabled by asymmetric singular metasurfaces
• Graphene Oxide Photoreduction Recovers Graphene Hot Electron Cooling Dynamics
• Unravelling a Zigzag Pathway for Hot-Carrier Collection at CH3NH3PbI3/Graphene Interfaces
• Probing the formation of dark interlayer excitons via ultrafast photocurrent
• Photodiodes based in La0.7Sr0.3MnO3/single layer MoS2 hybrid vertical heterostructures
• Single- and narrow-line photoluminescence in a boron nitride-supported MoSe${}_2$/graphene heterostructure
• External screening and lifetime of exciton population in single-layer ReSe${}_2$ probed by time- and angle-resolved photoemission spectroscopy
• Device model for pixelless infrared image up-converters based on polycrystalline graphene heterostructures
• Towards Fast Multicolor Photodetectors based on Graphene Contacted Vertical p-GaSe/n-InSe van der Waals Heterostructure
• Dielectric properties of graphene on transition metal dichalcogenide substrate
• Designable exciton mixing through layer alignment in WS${}_2$-graphene heterostructures
• Intrinsic ultrafast edge photocurrent dynamics in WTe${}_2$ driven by broken crystal symmetry
• Strained 2D TMD lateral heterojunctions via grayscale thermal-Scanning Probe Lithography
• Subnanometric control of coupling between WS${}_2$ monolayers with a molecular spacer
• Chargeable photoconductivity in Van der Waals heterojunctions