Light-emitting diodes by bandstructure engineering in van der Waals heterostructures

Abstract

The advent of graphene and related 2D materials has recently led to a new technology: heterostructures based on these atomically thin crystals. The paradigm proved itself extremely versatile and led to rapid demonstration of tunnelling diodes with negative differential resistance, tunnelling transistors5, photovoltaic devices, etc. Here we take the complexity and functionality of such van der Waals heterostructures to the next level by introducing quantum wells (QWs) engineered with one atomic plane precision. We describe light emitting diodes (LEDs) made by stacking up metallic graphene, insulating hexagonal boron nitride (hBN) and various semiconducting monolayers into complex but carefully designed sequences. Our first devices already exhibit extrinsic quantum efficiency of nearly 10% and the emission can be tuned over a wide range of frequencies by appropriately choosing and combining 2D semiconductors (monolayers of transition metal dichalcogenides). By preparing the heterostructures on elastic and transparent substrates, we show that they can also provide the basis for flexible and semi-transparent electronics. The range of functionalities for the demonstrated heterostructures is expected to grow further with increasing the number of available 2D crystals and improving their electronic quality.

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• Electric Field Effect in Atomically Thin Carbon Films
• Two Dimensional Atomic Crystals
• Atomically thin p-n junctions with van der Waals heterointerfaces
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Cited by in corpus (63)

• 2D materials and van der Waals heterostructures
• Mixed-Dimensional van der Waals Heterostructures
• Photocurrent generation with two-dimensional van der Waals semiconductors
• Resonantly hybridised excitons in moiré superlattices in van der Waals heterostructures
• Determination of band alignment in the single layer MoS2/WSe2 heterojunction
• Recent progress in the assembly of nanodevices and van der Waals heterostructures by deterministic placement of 2D materials
• Sequential Edge-Epitaxy in 2D Lateral Heterostructures
• Electrical suppression of all nonradiative recombination pathways in monolayer semiconductors
• Interlayer Exciton Optoelectronics in a 2D Heterostructure p-n Junction
• Ultrafast Exciton Dissociation and Long-Lived Charge Separation in a Photovoltaic Pentacene MoS2 van der Waals Heterojunction
• Intrinsically patterned two-dimensional materials for selective adsorption of molecules and nanoclusters
• Exciton and trion dynamics in atomically thin MoSe2 and WSe2: effect of localization
• Optimal charge-to-spin conversion in graphene on transition metal dichalcogenides
• Optical response of monolayer, few-layer and bulk tungsten disulfide
• Device physics of van der Waals heterojunction solar cells
• Phase segregation facilitates exfoliation of franckeite crystals to a single unit cell thickness
• Composite super-moiré lattices in double aligned graphene heterostructures
• Franckeite: a naturally occurring van der Waals heterostructure
• Inhibited nonradiative decay at all exciton densities in monolayer semiconductors
• Indirect to direct gap crossover in two-dimensional InSe revealed by ARPES
• Observing imperfection in atomic interfaces for van der Waals heterostructures
• Structure, preparation, and applications of 2D material-based metal-semiconductor heterostructures
• Upconverted electroluminescence via Auger scattering of interlayer excitons in van der Waals heterostructures
• Efficient cathodoluminescence of monolayer transitional metal dichalcogenides in a van der Waals heterostructure
• Ultra-thin van der Waals crystals as semiconductor quantum wells
• Rearrangement of Van-der-Waals Stacking and Formation of a Singlet State at $T=90$ K in a Cluster Magnet
• Thermal light emission from monolayer MoS2
• Planar and van der Waals heterostructures for vertical tunnelling single electron transistors
• Dielectrics for Two-Dimensional Transition Metal Dichalcogenide Applications
• Sub-bandgap voltage electroluminescence and magneto-oscillations in a WSe2 light-emitting van der Waals heterostructure
• Pinpoint pick-up and bubble-free assembly of 2D materials using PDMS/PMMA polymers with lens shapes
• Dative epitaxy of commensurate monocrystalline covalent-van der Waals moiré supercrystal
• Exploring the Structural Stability, Electronic and Thermal Attributes of synthetic 2D Materials and their Heterostructures
• Rotationally Aligned Hexagonal Boron Nitride on Sapphire by High-Temperature Molecular Beam Epitaxy
• Ultralow Schottky Barriers in hBN-Encapsulated Monolayer WSe${}_2$ Tunnel Field-Effect Transistors
• Mechanical and liquid phase exfoliation of cylindrite: a natural van der Waals superlattice with intrinsic magnetic interactions
• Field-induced dissociation of two-dimensional excitons in transition-metal dichalcogenides
• Electronic and optical excitations of two-dimensional ZrS${}_2$ and HfS${}_2$ and their heterostructure
• Enhanced Light-Matter Interaction in Graphene/h-BN van der Waals Heterostructures
• Tunneling-current-induced local excitonic luminescence in p-doped WSe${}_2$ monolayers
• Simultaneous measurement of anisotropic thermal conductivity and thermal boundary conductance of 2-dimensional materials
• Strain and Water Effects on the Electronic Structure and Chemical Activity of In-Plane Graphene/Silicene Heterostructure
• Oxidising and carburising catalyst conditioning for the controlled growth and transfer of large crystal monolayer hexagonal boron nitride
• Plasma-enhanced atomic layer deposition of Al${}_2$O${}_3$ on graphene using monolayer hBN as interfacial layer
• Dynamical screening effects of substrate phonons on two-dimensional excitons
• Abrupt changes in the graphene on Ge(001) system at the onset of surface melting
• First-principles quantum corrections for carrier correlations in double-layer two-dimensional heterostructures
• Metric-driven search for structurally stable inorganic compounds
• Selective Etching of Hexagonal Boron Nitride by High-Pressure CF4 Plasma for Individual One-dimensional Ohmic Contacts to Graphene Layers
• Growth, charge and thermal transport of flowered graphene
• Self-assembled nano-columns in Bi2Se3 grown by molecular beam epitaxy
• Phonon-Mediated Quasiparticle Lifetime Renormalizations in Few-Layer Hexagonal Boron Nitride
• Photodiodes based in La0.7Sr0.3MnO3/single layer MoS2 hybrid vertical heterostructures
• Microsphere-coupled light emission control of van der Waals heterostructures
• Two-dimensional Janus van der Waals heterojunctions: a review of recent research progresses
• Electronic structure of 2D van der Waals crystals and heterostructures investigated by spatially- and angle-resolved photoemission
• Genuine Ohmic van der Waals contact between indium and MoS2
• Winterface: An Interface from Wannier90 to Quantum Transport
• Charge distribution at metal-multilayered semiconductor interfaces
• The scaling of the microLED and the advantage of 2D materials
• Understanding the Effects of Dielectric Property, Separation Distance, and Band Alignment on Interlayer Excitons in 2D Hybrid MoS2/WSe2 Heterostructures
• Excitation energy dependence of Raman spectra of few-layer WS2
• Coupling quantum emitters in 2D materials with tapered fibers