Silicene Passivation by Few-Layer Graphene

Ritter, Viktoria; Genser, Jakob; Nazzari, Daniele; Bethge, Ole; Bertagnolli, E.; Lugstein, Alois

doi:10.1021/acsami.8b20751

Cited by 21 publications

(28 citation statements)

References 53 publications

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“… 34 In our previous work, we have presented a method for passivating silicene layers by encapsulating them by few-layer graphene (FLG) flakes. 19 The passivation, performed directly in UHV, is based on the mechanical exfoliation of graphite on top of the freshly grown silicene layer. The FLG flake forms an exceptional barrier against oxidative species and, thanks to its inert surface, preserves silicene structure unaltered.…”

Section: Resultsmentioning

confidence: 99%

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Highly Biaxially Strained Silicene on Au(111)

et al. 2021

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Many of graphene’s remarkable properties arise from its linear dispersion of the electronic states, forming a Dirac cone at the K points of the Brillouin zone. Silicene, the 2D allotrope of silicon, is also predicted to show a similar electronic band structure, with the addition of a tunable bandgap, induced by spin–orbit coupling. Because of these outstanding electronic properties, silicene is considered as a promising building block for next-generation electronic devices. Recently, it has been shown that silicene grown on Au(111) still possesses a Dirac cone, despite the interaction with the substrate. Here, to fully characterize the structure of this 2D material, we investigate the vibrational spectrum of a monolayer silicene grown on Au(111) by polarized Raman spectroscopy. To enable a detailed ex situ investigation, we passivated the silicene on Au(111) by encapsulating it under few layers hBN or graphene flakes. The observed spectrum is characterized by vibrational modes that are strongly red-shifted with respect to the ones expected for freestanding silicene. By comparing low-energy electron diffraction (LEED) patterns and Raman results with first-principles calculations, we show that the vibrational modes indicate a highly (>7%) biaxially strained silicene phase.

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Section: Resultsmentioning

confidence: 99%

“…To enable detailed polarized micro-Raman characterization, silicene was passivated in situ immediately after the growth by mechanical exfoliation of few-layer hBN or graphene flakes (HQ Graphene) 19 in a dedicated UHV chamber, directly connected to the evaporation chamber.…”

Section: Methodsmentioning

confidence: 99%

Highly Biaxially Strained Silicene on Au(111)

et al. 2021

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“…27−29 For graphene, we demonstrated recently that it is capable of forming an effective barrier against oxidizing species, while preserving the structural integrity of a subjacent silicene layer on Ag(111). 29 In this study, silicene was passivated in situ directly after the growth using few-layer hBN, which has already been proven to be a suitable passivation for silicene 30 and germanene. 31 The intrinsic transparency of hBN with a wide band gap of 5.95 eV 32 enables direct access to the optical properties of the subjacent silicene layer over a wide spectral range.…”

Section: ■ Results and Discussionmentioning

confidence: 99%

“…Similar observations have been made when passivating silicene on Ag(111) with fewlayer graphene using the same technique. 29 Notably, traces of intact silicene in the center of an hBN flake can even be detected after several days in ambient atmosphere.…”

Section: ■ Results and Discussionmentioning

confidence: 99%

Optical Signatures of Dirac Electrodynamics for hBN-Passivated Silicene on Au(111)

et al. 2021

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The allotropic affinity for bulk silicon and unique electronic and optical properties make silicene a promising candidate for future high-performance devices compatible with mature complementary metal−oxide−semiconductor technology. However, silicene's outstanding properties are not preserved on its most prominent growth templates, due to strong substrate interactions and hybridization effects. In this letter, we report the optical properties of silicene epitaxially grown on Au(111). A novel in situ passivation methodology with few-layer hexagonal boron nitride enables detailed ex situ characterization at ambient conditions via μ-Raman spectroscopy and reflectance measurements. The optical properties of silicene on Au(111) appeared to be in accordance with the characteristics predicted theoretically for freestanding silicene, allowing the conclusion that its prominent electronic properties are preserved. The absorption features are, however, modified by many-body effects induced by the Au substrate due to an increased screening of electron−hole interactions.

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“…[ 195 ] Encapsulation of the silicene layer with ultra‐thin Al layer [ 196 ] and Al 2 O 3 [ 197 ] is an effective action to prevent the degradation process. As the excellent passivation layers, the 2D materials such as graphene [ 198 ] must be air‐stable and with inertness and good flexibility. Surface fluorinated silicene can provide more stability and thus induce transition from semiconductor to metal.…”

Section: Selected Properties Of Xenes For Electrochemical Applicationmentioning

confidence: 99%

Xenes as an Emerging 2D Monoelemental Family: Fundamental Electrochemistry and Energy Applications

Wang

Kou

et al. 2020

Adv Funct Materials

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As an emerging subclass of 2D materials, Xenes (e.g., borophene, silicene, germanene, stanene, phosphorene, arsenene, antimonene, and bismuthene) consist of one single element and have opened the door for various important applications. Benefiting from their impressive characteristics, including ultrathin folded structure, ultrahigh surface–volume ratio, excellent mechanical strength and flexibility, Xenes are considered as promising electrode materials in the field of electrochemical energy with large capacity, high rate, and high safety. This review provides a comprehensive summary of selected properties, synthetic challenges, and the latest theoretical and experimental advances in the energy‐related applications of Xenes, including Li/Na ion batteries, Li–S batteries, electrocatalysis, and supercapacitors. Finally, the challenges and outlook of this emerging field are discussed.

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Silicene Passivation by Few-Layer Graphene

Cited by 21 publications

References 53 publications

Highly Biaxially Strained Silicene on Au(111)

Highly Biaxially Strained Silicene on Au(111)

Optical Signatures of Dirac Electrodynamics for hBN-Passivated Silicene on Au(111)

Xenes as an Emerging 2D Monoelemental Family: Fundamental Electrochemistry and Energy Applications

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