Atomic adsorption of Sn on mechanically cleaved WS2 surface at room temperature

Mohan, Manu; Singh, Vipin Kumar; Reshmi, S.; Barman, Sudipta Roy; Bhattacharjee, A. K.

doi:10.1016/j.susc.2020.121685

Cited by 5 publications

(9 citation statements)

References 90 publications

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“…Flat WS 2 surface with dark spots, a typical signature on the TMD crystal surfaces [42,43] is evident in Fig. 1(a).We do not find evidence of contaminants or foreign adsorbed species in the STM investigations [38] as shown in Fig. 1.…”

Section: Resultsmentioning

confidence: 59%

“…1. Bare WS 2 in the atomic scale exhibits clear honeycomb lattice structure with lattice constant of approximately 0.34 nm [38]as can be seen in Fig. 1(b).…”

Section: Resultsmentioning

confidence: 77%

“…We assign the bright protrusions in the STM micro-graph [Fig. 1(b)] as the `S' atoms [38]. STM measurements carried out on the Sn grown sample at RT are shown in Fig.…”

Section: Resultsmentioning

confidence: 99%

“…Our previous scanning tunneling microscopy (STM) investigations reveal a 2D like commensurate growth of Sn on the `top' `S' sites of the WS 2 surface [38]. Further investigations related to local electronic structure of the Sn/WS 2 system are important to study hybridized states and electronic stability.…”

Section: Introductionmentioning

confidence: 95%

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In-situ STS studies and first principles calculations on bare and Sn adsorbed UHV exfoliated WS₂ layers

Mohan

Singh

Sahoo

et al. 2022

IOP Conf. Ser.: Mater. Sci. Eng.

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Abstarct. Two dimensional (2D) derivatives of tin (Sn) have obtained special deliberations recently due to practical realization of planar, as well as, buckled hexagonal lattice of Sn called stanene. However, it has been observed that proper choice of substrate is very important for growth of stanene like films owing to large core size of Sn that prefers sp 3 hybridization over sp 2. Transition metal dichalcogenides (TMDs) like MoS2 or WS2 with honey comb lattice structure seem to be promising substrate candidates for 2D growth of Sn. In the present work, we report mechanical exfoliation of few layers of WS2 under ultra-high vacuum (UHV) conditions and investigations of growth and local electronic structure by in-situ scanning tunneling microscopy (STM) and spectroscopy (STS) studies. Flat WS2 surface with honeycomb lattice structure in the atomic scale with a lattice constant of 0.34 nm is evident in the STM investigations, whereas, STS measurements reveal local density of states (LDOS) of WS2 with a bandgap of approximately 1.34 eV. Density functional theory (DFT) calculations performed by considering bulk WS2 reveal conduction and valence band states comprised of S p and W d at both sides of the Fermi energy (EF) and an indirect bandgap of 1.38 eV. Experimental observations upon Sn adsorption, reveal commensurate growth of Sn atoms on the sulfur `S’ sites with a buckling height of 40 ±10 pm. STS measurements exhibit local electronic structure of the Sn adsorbed surface with clear evidence of in-gap states. DFT calculations quantify the experimental results demonstrating `S’ sites as the most stable sites for the atomic adsorption of Sn with a buckling height of around 80 pm and reveal signature of in-gap hybridized states comprised of Sn p and W d orbitals.

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Section: Resultsmentioning

confidence: 59%

“…1. Bare WS 2 in the atomic scale exhibits clear honeycomb lattice structure with lattice constant of approximately 0.34 nm [38]as can be seen in Fig. 1(b).…”

Section: Resultsmentioning

confidence: 77%

“…We assign the bright protrusions in the STM micro-graph [Fig. 1(b)] as the `S' atoms [38]. STM measurements carried out on the Sn grown sample at RT are shown in Fig.…”

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 95%

See 2 more Smart Citations

In-situ STS studies and first principles calculations on bare and Sn adsorbed UHV exfoliated WS₂ layers

Mohan

Singh

Sahoo

et al. 2022

IOP Conf. Ser.: Mater. Sci. Eng.

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“…Indeed, starting from a well-known electronic material and modifying its atomic structure by creating controlled defects allows to shape its electronic properties in a desired direction. In that respect, a major challenge nowadays to control the creation of such defects is also an accurate characterization at the atomic level [19,20,23]. Such a characterization can rely on atomic probe microscopies such as Scanning Tunneling Microscopy (STM) or Atomic Force microscopy (AFM) which allow us to characterize the local electronic density or the local atomic forces.…”

Section: Introductionmentioning

confidence: 99%

Theoretical approach to point defects in a single transition metal dichalcogenide monolayer: conductance and force calculations in MoS 2

González¹,

Dappe²

2022

Comptes Rendus. Physique

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We present here a small review on our exhaustive theoretical study of point defects in a MoS 2 monolayer. Using Density Functional Theory (DFT), we characterize structurally and electronically different kinds of defects based on S and Mo vacancies, as well as their antisites. In combination with a Keldysh-Green formalism, we model the corresponding Scanning Tunneling Microscopy (STM) images. Also, we determine the forces to be compared with Atomic Force Microscopy (AFM) measurements, and explore the possibilities of molecular adsorption. Our method, as a support to experimental measurements allows to clearly discriminate the different types of defects. Finally, we present very recent results on lateral conductance calculations of defective MoS 2 nanoribbons. All these findings pave the way to novel applications in nanoelectronics or gas sensors, and show the need to further explore these new systems.Résumé. Nous présentons ici une mini-revue de nos différents travaux sur l'étude théorique des défauts dans une monocouche de MoS 2 . En utilisant la Théorie de la Fonctionnelle de la Densité (DFT), nous avons caractérisé structurellement et électroniquement différents types de défauts à partir de lacunes de S et Mo, ainsi que leurs antisites. En combinaison avec un formalisme de Green-Keldysh, nous avons simulé les images de microscopie à effet tunnel (STM) correspondantes. Egalement, nous avons déterminé les forces,

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Local hybridized states of adsorbed atomic Sn on WS2 substrate

Mohan

Singh

Reshmi

et al. 2023

Applied Surface Science

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Atomic adsorption of Sn on mechanically cleaved WS2 surface at room temperature

Cited by 5 publications

References 90 publications

In-situ STS studies and first principles calculations on bare and Sn adsorbed UHV exfoliated WS₂ layers

In-situ STS studies and first principles calculations on bare and Sn adsorbed UHV exfoliated WS₂ layers

Theoretical approach to point defects in a single transition metal dichalcogenide monolayer: conductance and force calculations in MoS 2

Local hybridized states of adsorbed atomic Sn on WS2 substrate

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Atomic adsorption of Sn on mechanically cleaved WS2 surface at room temperature

Cited by 5 publications

References 90 publications

In-situ STS studies and first principles calculations on bare and Sn adsorbed UHV exfoliated WS2 layers

In-situ STS studies and first principles calculations on bare and Sn adsorbed UHV exfoliated WS2 layers

Theoretical approach to point defects in a single transition metal dichalcogenide monolayer: conductance and force calculations in MoS 2

Local hybridized states of adsorbed atomic Sn on WS2 substrate

Contact Info

Product

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In-situ STS studies and first principles calculations on bare and Sn adsorbed UHV exfoliated WS₂ layers

In-situ STS studies and first principles calculations on bare and Sn adsorbed UHV exfoliated WS₂ layers