Interlayer exciton formation, relaxation, and transport in TMD van der Waals heterostructures

Light Science & Applications, Journal Year: 2021, Volume and Issue: 10(1)

Published: April 2, 2021

Abstract Van der Waals (vdW) heterostructures based on transition metal dichalcogenides (TMDs) generally possess a type-II band alignment that facilitates the formation of interlayer excitons between constituent monolayers. Manipulation in TMD vdW holds great promise for development excitonic integrated circuits serve as counterpart electronic circuits, which allows photons and to transform into each other thus bridges optical communication signal processing at circuit. As consequence, numerous studies have been carried out obtain deep insight physical properties excitons, including revealing their ultrafast formation, long population recombination lifetimes, intriguing spin-valley dynamics. These outstanding ensure with good transport characteristics, may pave way potential applications efficient devices heterostructures. At present, systematic comprehensive overview exciton relaxation, transport, is still lacking. In this review, we give description discussion these frontier topics provide valuable guidance researchers field.

Language: Английский

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2D Material‐Based Heterostructures for Rechargeable Batteries

Advanced Energy Materials, Journal Year: 2021, Volume and Issue: 12(4)

Published: June 26, 2021

Abstract 2D materials are regarded as promising electrode for rechargeable batteries because of their advantages in providing ample active sites and improving electrochemical reaction kinetics. However, it remains a great challenge to fulfill all requirements high‐performance energy storage devices terms electronic conductivity, the number accessible sites, structural stability, mass production capability. Recent advances constructing material‐based heterostructures offer opportunities utilizing synergistic effects between individual blocks achieve optimized properties enhanced performance. In this perspective, latest summarized, with particular emphasis on multifunctional roles batteries. Synthetic strategies, features mixed dimensionalities, structure engineering distinct functionalities various applications systematically introduced. Finally, challenges perspectives presented highlight future developing practical storage.

Language: Английский

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MoS2 Based Photodetectors: A Review

Sensors, Journal Year: 2021, Volume and Issue: 21(8), P. 2758 - 2758

Published: April 14, 2021

Photodetectors based on transition metal dichalcogenides (TMDs) have been widely reported in the literature and molybdenum disulfide (MoS2) has most extensively explored for photodetection applications. The properties of MoS2, such as direct band gap low dimensional structures, strong light–matter interaction good carrier mobility, combined with possibility fabricating thin MoS2 films, attracted interest this material field optoelectronics. In work, MoS2-based photodetectors are reviewed terms their main performance metrics, namely responsivity, detectivity, response time dark current. Although neat detectors already show remarkable characteristics visible spectral range, can be advantageously coupled other materials to further improve detector Nanoparticles (NPs) quantum dots (QDs) exploited combination boost devices near ultraviolet (NUV) infrared (IR) range. Moreover, heterostructures different (e.g., TMDs, Graphene) speed up through creation built-in electric fields faster transport charge carriers. Finally, order enhance stability devices, perovskites both passivation layers electron reservoirs.

Language: Английский

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Monolayer CeI2 : An intrinsic room-temperature ferrovalley semiconductor

Physical review. B./Physical review. B, Journal Year: 2022, Volume and Issue: 105(7)

Published: Feb. 14, 2022

Two-dimensional ferrovalley semiconductors with robust room-temperature ferromagnetism and sizable valley polarization hold great prospects for future miniature information storage devices. As a new member of the ferroic family, however, such materials have rarely been reported. By first-principles calculations, we identify that monolayer $\mathrm{Ce}{\mathrm{I}}_{\text{2}}$ is an intrinsic ferromagnetic semiconductor exhibits excellent ambient stability, strong easy in-plane magnetocrystalline anisotropy, high magnetic transition temperature up to 374 K. The found arise from hybridization Ce-$4f/5d$ I-$5p$ orbitals. When magnetized toward off-plane $z$ direction, spontaneous as large 208 meV in top valence band can be achieved due simultaneous breaking both inversion symmetry time-reversal symmetry, which further verified by perturbation theory spin-orbital coupling. Also, anomalous Hall effect observed under electrical field valley-contrasting Berry curvature. Overall, combination semiconducting renders compelling potential applications nanoscale spintronics valleytronics.

Language: Английский

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Valleytronics in bulk MoS2 with a topologic optical field

Nature, Journal Year: 2024, Volume and Issue: 628(8009), P. 746 - 751

Published: April 24, 2024

Language: Английский

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Synthesis, Modulation, and Application of Two-Dimensional TMD Heterostructures

Chemical Reviews, Journal Year: 2024, Volume and Issue: 124(17), P. 10112 - 10191

Published: Aug. 27, 2024

Two-dimensional (2D) transition metal dichalcogenide (TMD) heterostructures have attracted a lot of attention due to their rich material diversity and stack geometry, precise controllability structure properties, potential practical applications. These not only overcome the inherent limitations individual materials but also enable realization new properties through appropriate combinations, establishing platform explore physical chemical at micro-nano-pico scales. In this review, we systematically summarize latest research progress in synthesis, modulation, application 2D TMD heterostructures. We first introduce techniques for fabricating heterostructures, examining rationale, mechanisms, advantages, disadvantages each strategy. Furthermore, emphasize importance characteristic modulation discuss some approaches achieve novel functionalities. Then, representative applications Finally, highlight challenges future perspectives synthesis device fabrication provide feasible solutions.

Language: Английский

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Enhanced Electrochemical Performance and Charge-Transfer Dynamics of 2D MoS₂/WO₃ Nanocomposites for Futuristic Energy Applications

ACS Applied Nano Materials, Journal Year: 2024, Volume and Issue: 7(8), P. 8593 - 8611

Published: April 15, 2024

The hybrid structures of transition-metal dichalcogenides and oxides show enhanced properties by incorporating the qualities two pristine materials into a single one. In view this, present work focuses on synthesizing series MoS2/WO3 nanocomposites wherein molar ratio MoS2 to WO3 was gradually varied achieve optimized for photovoltaic applications. samples were analyzed structural, optical, morphological, microstructural, electrokinetic, electrical, electrochemical properties. Integrating provided in form wider absorbance range, band gap, better colloidal stability, increased charge-carrier mobility. as-synthesized showed UV visible regions with gap varying from 1.3 2.66 eV. zeta potential measurement high stability some values < −30 mV. Hall effect study revealed enhancement electrical properties, mobility is found be order 880 m2/(V s). redox process also more prominent nanocomposite as well diffusive behavior cyclic voltammetry. presence Warburg diffusion along high-exchange current density observed few potentio impedance spectroscopy highest value 336 μA. reveals that catalytic, can solar cell applications controlling constituent materials.

Language: Английский

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Spintronics in Two-Dimensional Materials

Nano-Micro Letters, Journal Year: 2020, Volume and Issue: 12(1)

Published: April 18, 2020

Abstract Spintronics, exploiting the spin degree of electrons as information vector, is an attractive field for implementing beyond Complemetary metal-oxide-semiconductor (CMOS) devices. Recently, two-dimensional (2D) materials have been drawing tremendous attention in spintronics owing to their distinctive spin-dependent properties, such ultra-long relaxation time graphene and spin–valley locking transition metal dichalcogenides. Moreover, related heterostructures provide unprecedented probability combining different characteristics via proximity effect, which could remedy limitation individual 2D materials. Hence, engineering has growing extremely fast made significant achievements injection manipulation. Nevertheless, there are still challenges toward practical application; example, mechanism unclear, high-efficiency gating not yet achieved. In this review, we focus on systematically summarize progress injection, transport, manipulation, application storage processing. We also highlight current future perspectives studies spintronic devices based

Language: Английский

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Direct Observation of the Linear Dichroism Transition in Two-Dimensional Palladium Diselenide

Nano Letters, Journal Year: 2020, Volume and Issue: 20(2), P. 1172 - 1182

Published: Jan. 16, 2020

The linear dichroism (LD) transition within anisotropic photonic materials displays promising prospects for applications in polarization-wavelength-selective detectors, optical switching, and communication. In conventional two-dimensional (2D) materials, the LD is predominantly uniaxial over a broad spectrum of wavelengths arises principally from reduced symmetry materials. However, behavior crystalline 2D remains elusive. Here, we demonstrate observation unique conversion phenomenon at wavelength 472 nm palladium diselenide (PdSe2) using polarization-resolved absorption spectroscopy. This material exhibits prominent responses high ratio αy/αx ≈ 1.11 364 nm, 1.15 532 0.84 633 nm. We propose that this abnormal originates forceful localization rules different parallel energy bands exist material. Furthermore, robust periodicity Ag B1g modes Raman spectroscopy good agreement with theoretical structure analysis. indicates strong intrinsic effect nature PdSe2, which offers macrolevel determination crystal orientations. Such features, combination effects, enable air-stable PdSe2 to be potential candidate technological innovations multispectral imaging, sensing, polarization-sensitive wavelength-controllable photoelectronic applications.

Language: Английский

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Controllable synthesis of NiS and NiS2 nanoplates by chemical vapor deposition

Nano Research, Journal Year: 2020, Volume and Issue: 13(9), P. 2506 - 2511

Published: July 2, 2020

Language: Английский

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