Two-Dimensional Metal–Chalcogenide Films in Tunable Optical Microcavities

Schwarz, Stefan; Dufferwiel, S.; Walker, P. M.; Withers, Freddie; Trichet, A. A. P.; Sich, M.; Li, F.; Chekhovich, E. A.; Borisenko, D. N.; Kolesnikov, N. N.; Новоселов, К. С.; Skolnick, M. S.; Smith, Jason M.; Krizhanovskii, D. N.; Tartakovskii, A. I.

doi:10.1021/nl503312x

Cited by 132 publications

(110 citation statements)

References 34 publications

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“…As mentioned before, at low excitation powers of several tens of W/cm 2 typically only one emission line is visible. We believe that the emission stems This sub-linear increase has been reported previously for bound excitons in two-dimensional semiconductors [35] and GaSe [36] as well as for multiple quantum wells [37], while free excitons exhibit a linear increase with the power. The low energy emission LXX at 1.957 eV increases quadratically compared to the localized exciton LX ( ), which is typical for biexcitons [38].…”

supporting

confidence: 76%

Single-photon emitters in GaSe

et al. 2017

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This is an author produced version of a paper subsequently published in 2D Mater. Tonndorf et al, Single-photon emitters in GaSe (2017) 4 021010, https://doi.org/10. 1088/2053-1583/aa525b eprints@whiterose.ac.uk https://eprints.whiterose.ac.uk/ Reuse Unless indicated otherwise, fulltext items are protected by copyright with all rights reserved. The copyright exception in section 29 of the Copyright, Designs and Patents Act 1988 allows the making of a single copy solely for the purpose of non-commercial research or private study within the limits of fair dealing. The publisher or other rights-holder may allow further reproduction and re-use of this version -refer to the White Rose Research Online record for this item. Where records identify the publisher as the copyright holder, users can verify any specific terms of use on the publisher's website. TakedownIf you consider content in White Rose Research Online to be in breach of UK law, please notify us by emailing eprints@whiterose.ac.uk including the URL of the record and the reason for the withdrawal request.

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supporting

confidence: 76%

Single-photon emitters in GaSe

et al. 2017

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“…Spontaneous emission from a TMD monolayer can be enhanced due to the Purcell effect by coupling to an optical cavity [78,79]. Enhanced PL emission from MoS 2 , placed on top of a microdisc cavity, was shown by Reed et al [80] Photonic crystal cavities [81] (Figure 6a) or microdisc cavities [82,83] (Figure 6b) with even higher quality factors have been used to demonstrate lasing.…”

Section: Light-emittersmentioning

confidence: 97%

Optoelectronic Devices Based on Atomically Thin Transition Metal Dichalcogenides

2016

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Abstract:We review the application of atomically thin transition metal dichalcogenides in optoelectronic devices. First, a brief overview of the optical properties of two-dimensional layered semiconductors is given and the role of excitons and valley dichroism in these materials are discussed. The following sections review and compare different concepts of photodetecting and light emitting devices, nanoscale lasers, single photon emitters, valleytronics devices, as well as photovoltaic cells. Lateral and vertical device layouts and different operation mechanisms are compared. An insight into the emerging field of valley-based optoelectronics is given. We conclude with a critical evaluation of the research area, where we discuss potential future applications and remaining challenges.

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“…Such properties are very attractive for optoelectronic applications including photovoltaics [12][13][14][15] and light emitting diodes 10,[16][17][18][19][20][21][22][23] as well as optical micro-cavity devices 24,25 including lasers and exciton-polariton structures 26 . Furthermore, a strong spin-orbit interaction in these compounds, has been predicted by density functional theory 27,28 : in WX 2 (MoX 2 ) the lowest energy states in the conduction band and the highest energy states in the valence band have the opposite (same) spin orientations, preventing (enabling) their recombination with emission of a photon (see Fig.1F).…”

Section: Introductionmentioning

confidence: 99%

WSe₂ Light-Emitting Tunneling Transistors with Enhanced Brightness at Room Temperature

et al. 2015

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Monolayers of molybdenum and tungsten dichalcogenides are direct bandgap semiconductors, which makes them promising for opto-electronic applications. In particular, van der Waals heterostructures consisting of monolayers of MoS 2 sandwiched between atomically thin hexagonal boron nitride (hBN) and graphene electrodes allows one to obtain light emitting quantum wells (LEQW's) with low-temperature external quantum efficiency (EQE) of 1%. However, the EQE of MoS 2 and MoSe 2 -based LEQW's shows behavior common for many other materials: it decreases fast from cryogenic conditions to room temperature, undermining their practical applications. Here we compare MoSe 2 and WSe 2 LEQW's. We show that the EQE of WSe 2 devices grows with temperature, with room temperature EQE reaching 5%, which is 250x more than the previous best performance of MoS 2 and MoSe 2 quantum wells in ambient conditions. We attribute such a different temperature dependences to the inverted sign of spin-2 orbit splitting of conduction band states in tungsten and molybdenum dichalcogenides, which makes the lowest-energy exciton in WSe 2 dark.

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Two-Dimensional Metal–Chalcogenide Films in Tunable Optical Microcavities

Cited by 132 publications

References 34 publications

Single-photon emitters in GaSe

Single-photon emitters in GaSe

Optoelectronic Devices Based on Atomically Thin Transition Metal Dichalcogenides

WSe₂ Light-Emitting Tunneling Transistors with Enhanced Brightness at Room Temperature

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Two-Dimensional Metal–Chalcogenide Films in Tunable Optical Microcavities

Cited by 132 publications

References 34 publications

Single-photon emitters in GaSe

Single-photon emitters in GaSe

Optoelectronic Devices Based on Atomically Thin Transition Metal Dichalcogenides

WSe2 Light-Emitting Tunneling Transistors with Enhanced Brightness at Room Temperature

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Product

Resources

About

WSe₂ Light-Emitting Tunneling Transistors with Enhanced Brightness at Room Temperature