Enhanced Emission from Defect Levels in Multilayer MoS<sub>2</sub>

Lin, Yuankun; Hathaway, Evan; Habis, Fatimah; Wang, Yuanxi; González-Rodríguez, Roberto; Alnasser, Khadijah; Hurley, Noah; Cui, Jingbiao

doi:10.1002/adom.202201059

Cited by 9 publications

(16 citation statements)

References 80 publications

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“…In contrast, in a multilayer MoS 2 , it has been shown that large thermal energies are essential to change the electronic band structure and to enable the population inversion and subsequent radiative relaxations from the defect levels. [68] In agreement with ref. [68], we have also observed the suppression of PL emissions from defect-bound excitons in multilayer MoS 2 (see Section S11, Supporting Information).…”

Section: [27]supporting

confidence: 92%

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Spectroscopic Study of the Excitonic Structure in Monolayer MoS₂ under Multivariate Physical and Chemical Stimuli

Bender

Bucher

Mishuk

et al. 2023

Physica Status Solidi (a)

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Photoluminescence (PL) spectroscopy has proven to provide deep insights into the optoelectronic properties of monolayer . Herein, a corresponding study is conducted on the excitonic properties of mechanically exfoliated monolayer under multivariate physical and chemical stimuli. Specifically, midgap exciton states that originate from lattice defects are characterized and they are compared to existing models. Through statistical data analyses of substrate‐, temperature‐, and laser‐power‐dependent measurements, a PL enhancement is revealed through physisorption of water molecules of the controversially discussed excited‐state A biexciton (). In addition, analyses of monolayer on gold substrates show that surface roughness does not account for changes in doping level within the material. Also, a shift in the electron–phonon coupling properties that arises from thin films of water that are physisorbed on top of the samples is reported.

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Section: [27]supporting

confidence: 92%

“…[68] In agreement with ref. [68], we have also observed the suppression of PL emissions from defect-bound excitons in multilayer MoS 2 (see Section S11, Supporting Information).…”

Section: [27]supporting

confidence: 92%

Spectroscopic Study of the Excitonic Structure in Monolayer MoS₂ under Multivariate Physical and Chemical Stimuli

Bender

Bucher

Mishuk

et al. 2023

Physica Status Solidi (a)

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“…We did not observe any superfluorescence [56] or stimulated emission as observed in the multilevel energy system. [57] Again we look at the irreversible and reversible relaxation phenomenon for RPP of n = 2. Figure 3b shows normalized PLs relative to the LES peak when the laser power was initially at 0.2 mW, increased to 3.5 mW, and then returned to 0.2 mW.…”

Section: Figure 1amentioning

confidence: 99%

Reversible and Irreversible Layer Edge Relaxation in Laser‐Radiation‐Hardened 2D Organic–Inorganic Perovskite Crystals

Kamau

Hou

Hurley

et al. 2023

Physica Rapid Research Ltrs

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The layer edge states or low energy state (LES) in 2D hybrid organic–inorganic perovskites demonstrate a prolonged carrier lifetime for better performance of optoelectronic devices. However, the fundamental understanding of LES in 2D perovskites is still inconclusive. Herein, a photoluminescence (PL) study of LES in 2D Ruddlesden–Popper perovskites is presented with n = 2 and n = 3 from their cleaved cross sections that are more stable than the natural edge. The PL measurements clearly observe reversible, and irreversible surface relaxations (case I and case II) in three laser intensity ranges, further supported by a PL excitation cycle from low to high laser intensity, and vice versa. The PL wavelength of LES is tunable with laser intensity and blueshifts with increasing laser intensity during irreversible surface relaxation process (case I). Fluorescence lifetime imaging (FLIM) shows that the LES has a longer lifetime than the band‐edge emission in the sample without a photodegradation, while the BE lifetime becomes relatively longer in the area with a photodegradation. The presented laser tunable LES and the related irreversible relaxation process provide a new insight that can help improve the photostability in 2D perovskites and understand roles of LESs in optoelectronic device performance.

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“…A possible breakthrough in this area could be achieved through a combination of stimulated emission and single-photon emission, as demonstrated in the work by Wei et al [21] Strain engineering, [22][23][24][25][26][27][28] as an additional degree of freedom, has been used for controlling and manipulating the electrical and optical properties of 2D semiconductors. Thermal strains induced through laser excitation, mechanical strains through wrinkles, or tension strains have been shown to tune the direct bandgap to indirect and vice versa, [29][30][31] enhance PL emission [29,32,33] and single-photon emission, [3,27,[34][35][36][37] and improve carrier mobilities in TMD-based transistors. [38] Excitonic lasers based on free excitons in monolayer TMDs [39,40] have been realized by integrating monolayers into microdisk resonators or photonic crystal cavity.…”

Section: Introductionmentioning

confidence: 99%

Strain‐Activated Stimulated Emission from Multilayer MoSe₂ in a Narrow Operation Window

Lin,

Hurley,

Kamau

et al. 2023

Physica Rapid Research Ltrs

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In this paper, we have studied photoluminescence (PL) and fluorescence lifetime imaging (FLIM) in multilayer MoSe2. We have firmly observed strain‐activated stimulated emission via defect levels in multilayer MoSe2 under laser excitation, for the first time in defects of transition metal dichalcogenides. The stimulated emission is indicated by a threshold behavior of PL emission intensity with respect to laser intensity, strong polarization effects, achieved population inversion with a difference in lifetimes of two competing excited states, and localization of the stimulated emission zone as observed in FLIM. The presented results not only demonstrate strain‐activated stimulated emission and highlight the necessity of strain‐engineering in tailoring two‐dimensional layered materials for optoelectronic applications, but also shed light on the design of stimulated emission in transition metal dichalcogenide’s defects to tailor for potential single‐photon emission behavior.This article is protected by copyright. All rights reserved.

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Enhanced Emission from Defect Levels in Multilayer MoS₂

Abstract: The ORCID identification number(s) for the author(s) of this article can be found under https://doi.org/10.1002/adom.202201059.

Cited by 9 publications

References 80 publications

Spectroscopic Study of the Excitonic Structure in Monolayer MoS₂ under Multivariate Physical and Chemical Stimuli

Spectroscopic Study of the Excitonic Structure in Monolayer MoS₂ under Multivariate Physical and Chemical Stimuli

Reversible and Irreversible Layer Edge Relaxation in Laser‐Radiation‐Hardened 2D Organic–Inorganic Perovskite Crystals

Strain‐Activated Stimulated Emission from Multilayer MoSe₂ in a Narrow Operation Window

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Enhanced Emission from Defect Levels in Multilayer MoS2

Abstract: The ORCID identification number(s) for the author(s) of this article can be found under https://doi.org/10.1002/adom.202201059.

Cited by 9 publications

References 80 publications

Spectroscopic Study of the Excitonic Structure in Monolayer MoS2 under Multivariate Physical and Chemical Stimuli

Spectroscopic Study of the Excitonic Structure in Monolayer MoS2 under Multivariate Physical and Chemical Stimuli

Reversible and Irreversible Layer Edge Relaxation in Laser‐Radiation‐Hardened 2D Organic–Inorganic Perovskite Crystals

Strain‐Activated Stimulated Emission from Multilayer MoSe2 in a Narrow Operation Window

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Product

Resources

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Enhanced Emission from Defect Levels in Multilayer MoS₂

Spectroscopic Study of the Excitonic Structure in Monolayer MoS₂ under Multivariate Physical and Chemical Stimuli

Spectroscopic Study of the Excitonic Structure in Monolayer MoS₂ under Multivariate Physical and Chemical Stimuli

Strain‐Activated Stimulated Emission from Multilayer MoSe₂ in a Narrow Operation Window