Effects of interlayer coupling on the excitons and electronic structures of WS2/hBN/MoS2 van der Waals heterostructures

Zhu, Xudan; He, Junbo; Zhang, Rongjun; Cong, Chunxiao; Zheng, Yu‐Xiang; Zhang, Hao; Wang, Song-You; Zhao, Haibin; Zhu, Meiping; Zhang, Shanwen; Li, Shaojuan; Chen, Liang‐Yao

doi:10.1007/s12274-021-3774-4

Cited by 23 publications

(36 citation statements)

References 67 publications

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“…The insulating hBN would prevent any possible charge transfer in the heterostructure. 47,48 This confirms that the charge transfer phenomenon is not responsible for the enhanced optical properties from our mixed-dimensional heterostructures. We perform numerical simulations employing finite element modeling to understand the origin of the enhanced optical response in our mixed-dimensional heterostructure.…”

Section: ■ Results and Discussionsupporting

confidence: 75%

“…The insulating hBN would prevent any possible charge transfer in the heterostructure. 47,48 Figure 3a,b shows the schematic and the optical image of the hBN intercalated mixeddimensional heterostructure, respectively. A PL mapping taken from the highlighted area of the optical image shows maximum emission from the MoS 2 /hBN/NW region.…”

Section: ■ Results and Discussionmentioning

confidence: 99%

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Inducing Strong Light–Matter Coupling and Optical Anisotropy in Monolayer MoS₂ with High Refractive Index Nanowire

Shafi

Ahmed

Fernández

et al. 2022

ACS Appl. Mater. Interfaces

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Mixed-dimensional heterostructures combine the merits of materials of different dimensions; therefore, they represent an advantageous scenario for numerous technological advances. Such an approach can be exploited to tune the physical properties of two-dimensional (2D) layered materials to create unprecedented possibilities for anisotropic and high-performance photonic and optoelectronic devices. Here, we report a new strategy to engineer the light−matter interaction and symmetry of monolayer MoS 2 by integrating it with one-dimensional (1D) AlGaAs nanowire (NW). Our results show that the photoluminescence (PL) intensity of MoS 2 increases strongly in the mixed-dimensional structure because of electromagnetic field confinement in the 1D high refractive index semiconducting NW. Interestingly, the 1D NW breaks the 3-fold rotational symmetry of MoS 2 , which leads to a strong optical anisotropy of up to ∼60%. Our mixed-dimensional heterostructure-based phototransistors benefit from this and exhibit an improved optoelectronic device performance with marked anisotropic photoresponse behavior. Compared with bare MoS 2 devices, our MoS 2 /NW devices show ∼5 times enhanced detectivity and ∼3 times higher photoresponsivity. Our results of engineering light−matter interaction and symmetry breaking provide a simple route to induce enhanced and anisotropic functionalities in 2D materials.

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Section: ■ Results and Discussionsupporting

confidence: 75%

Section: ■ Results and Discussionmentioning

confidence: 99%

Inducing Strong Light–Matter Coupling and Optical Anisotropy in Monolayer MoS₂ with High Refractive Index Nanowire

Shafi

Ahmed

Fernández

et al. 2022

ACS Appl. Mater. Interfaces

View full text Add to dashboard Cite

show abstract

“…† By monitoring the change of the polarization state of the reflected light, the optical information of the sample is recorded. In the SE measurement, the ellipsometric parameters Ψ and Δ are related to the reflectance ratio ρ, defined as [26][27][28][29]…”

Section: Resultsmentioning

confidence: 99%

“…By monitoring the change of the polarization state of the reflected light, the optical information of the sample is recorded. In the SE measurement, the ellipsometric parameters Ψ and Δ are related to the reflectance ratio ρ , defined as 26–29 ρ = r p / r s = tan Ψ exp( jΔ )where r p and r s are the Fresnel reflection coefficients of p- and s-polarized light, respectively. To obtain the dielectric constants of the SnS 2 layer, a three-phase model of sapphire substrate/SnS 2 /air ambient is considered.…”

Section: Resultsmentioning

confidence: 99%

Excellent response to near ultraviolet light and large intervalley scatterings of electrons in 2D SnS₂

Chen

et al. 2022

Nanoscale

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“…Employing timeresolved fluorescence/phosphorescence and transient absorption spectra can obtain a more sophisticated observation of the excitonic behavior. Moreover, the real-time and in situ characterization technologies, such as transient absorption (TA) spectra, spectroscopic ellipsometry (SE), 136 and polarization-resolved confocal PL mapping, 137 can trace the excitons' behavior online under real reaction conditions. We believe this insight into the excitonic effects is of great significance to skillfully design and optimize the surface and bulk structure of 2D materials for other photocatalytic applications, including N 2 fixation, water splitting, oxidative coupling of methane, atmospheric pollutant removal, disinfection, biomass conversion, plastic waste recycling, and phototherapy.…”

Section: Discussionmentioning

confidence: 99%

Manipulating Excitonic Effects in Layered Bismuth Oxyhalides for Photocatalysis

Shi

Mao

et al. 2022

ACS EST Eng.

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Two-dimensional semiconductors have attracted considerable attention in recent years because of their ability to utilize solar energy to mitigate environmental pollution through reactive oxygen species (ROSs) and synthesize solar fuels using superfluous CO2 as a raw material. However, low-dimensional materials usually display robust Coulomb interaction between electron and hole pairs because of their strong structure confinement ability, thus leading to the formation of electroneutral excitons. In light of this, excitonic effects overwhelmingly influence the photocatalytic properties of two-dimensional semiconductors, which should be comprehensively explored. Bismuth oxyhalides (BiOX, X = Cl, Br, I) of giant exciton binding energies are usually recognized as an excellent platform for excitonic effect investigation because their flexible geometric and electronic structures allow us to rationally manipulate the excitonic effects. This review first summarizes the recent progress in accelerating exciton dissociation for enhancing charge-carrier-dominated photocatalytic reactions and then demonstrates that harnessing the excitonic effects allows for the generation of singlet oxygen (1O2) for green chemical synthesis through a unique energy-transfer-dominated O2 activation route. We believe that a critical understanding of the excitonic effects in two-dimensional semiconductors can offer new perspectives and guidelines for the rational fabrication of advanced materials for photocatalytic applications.

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Effects of interlayer coupling on the excitons and electronic structures of WS2/hBN/MoS2 van der Waals heterostructures

Cited by 23 publications

References 67 publications

Inducing Strong Light–Matter Coupling and Optical Anisotropy in Monolayer MoS₂ with High Refractive Index Nanowire

Inducing Strong Light–Matter Coupling and Optical Anisotropy in Monolayer MoS₂ with High Refractive Index Nanowire

Excellent response to near ultraviolet light and large intervalley scatterings of electrons in 2D SnS₂

Manipulating Excitonic Effects in Layered Bismuth Oxyhalides for Photocatalysis

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Effects of interlayer coupling on the excitons and electronic structures of WS2/hBN/MoS2 van der Waals heterostructures

Cited by 23 publications

References 67 publications

Inducing Strong Light–Matter Coupling and Optical Anisotropy in Monolayer MoS2 with High Refractive Index Nanowire

Inducing Strong Light–Matter Coupling and Optical Anisotropy in Monolayer MoS2 with High Refractive Index Nanowire

Excellent response to near ultraviolet light and large intervalley scatterings of electrons in 2D SnS2

Manipulating Excitonic Effects in Layered Bismuth Oxyhalides for Photocatalysis

Contact Info

Product

Resources

About

Inducing Strong Light–Matter Coupling and Optical Anisotropy in Monolayer MoS₂ with High Refractive Index Nanowire

Inducing Strong Light–Matter Coupling and Optical Anisotropy in Monolayer MoS₂ with High Refractive Index Nanowire

Excellent response to near ultraviolet light and large intervalley scatterings of electrons in 2D SnS₂