One-dimensional organic nanostructures: A novel approach based on the selective adsorption of organic molecules on silicon nanowires

Salomon, Éric; Kahn, Antoine

doi:10.1016/j.susc.2008.04.023

Cited by 23 publications

(9 citation statements)

References 20 publications

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“…Thus far, freestanding silicene has not been synthesized. Most of the silicene structures were grown on Ag surfaces89101112131415161718, with a few successes on ZrB 2 19 and Ir20. Yet, interaction with the substrate may render it rather difficult to probe the intrinsic properties of silicene21222324.…”

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confidence: 99%

Interfacial Coupling and Electronic Structure of Two-Dimensional Silicon Grown on the Ag(111) Surface at High Temperature

Feng

Wagner

Zhang

2015

Sci Rep

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Freestanding silicene, a monolayer of Si arranged in a honeycomb structure, has been predicted to give rise to massless Dirac fermions, akin to graphene. However, Si structures grown on a supporting substrate can show properties that strongly deviate from the freestanding case. Here, combining scanning tunneling microscopy/spectroscopy and differential conductance mapping, we show that the electrical properties of the phase of few-layer Si grown on Ag(111) strongly depend on film thickness, where the electron phase coherence length decreases and the free-electron-like surface state gradually diminishes when approaching the interface. These features are presumably attributable to the inelastic inter-band electron-electron scattering originating from the overlap between the surface state, interface state and the bulk state of the substrate. We further demonstrate that the intrinsic electronic structure of the as grown phase is identical to that of the R30° reconstructed Ag on Si(111), both of which exhibit the parabolic energy-momentum dispersion relation with comparable electron effective masses. These findings highlight the essential role of interfacial coupling on the properties of two-dimensional Si structures grown on supporting substrates, which should be thoroughly scrutinized in pursuit of silicene.

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confidence: 99%

Interfacial Coupling and Electronic Structure of Two-Dimensional Silicon Grown on the Ag(111) Surface at High Temperature

Feng

Wagner

Zhang

2015

Sci Rep

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“…3 and fig. 5 of Salomon and Kahn [23]. 14 In this context, let us mention that passivation of the SiNRs by hydrogen should be easy; transposing from hydrogenated silicon nanowires, we can expect the appearance of a direct band gap [24].…”

Section: Reactivity Ofthe Silicene Stripesmentioning

confidence: 99%

Graphene-like Silicon Nano-ribbons on the Silver (110) Surface

Dávila¹,

Leandri

Kara

et al. 2008

2008 International Conference on Advanced Semiconductor Devices and Microsystems

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Silicene, a monolayer ofsilicon atoms packed into a two-dimensional honeycomb lattice is the challenging hypothetical reflection in the silicon realm ofgraphene, a one-atom thick graphite sheet, presently the hottest new material in condensed matter physics and nanotechnology. If existing, it would also reveal a cornucopia ofnew physics andpotential applications. Here, we reveal the catalytic growth of graphene-like silicon nano-ribbons self-aligned in a massively parallel array on the anisotropic Ag(110) surface. We compare with one-dimensional (ID) structures formed, more classically, the other way around, upon depositing gold or silver on the silicon (111) surface. Finally, we envisage wide ranging applications for these novel silicene stripes. IntroductionA huge number of works have been devoted to studies of the formation of metal-onsemiconductor interfaces, typically noble metals on group IV elemental semiconductor, and, especially, gold and silver on Si(111) surfaces, which are the most prototypical systems [1,2]. In the last period, interest has focused on 1D, Au and Ag atomic chains self-assembled on this surface because of their highly intriguing electronic properties involving novel onedimensional physics [3][4][5]. Conversely, very few studies have examined the reverse process of formation of silicon films on noble metal surfaces, although such films have also potential applications in semiconductor technology. Recent studies comprise the strongly reactive Si/Cu(1 10) system [6], the diffusive Si/Au(1 10) one [7] and the abrupt Si/Ag(1 10) one, first studied in Marseille [8][9]. Surprisingly, in this last case, massively parallel, straight, high aspect ratio, epitaxial metallic silicon nanoribbons (SiNRs) are formed on this anisotropic surface. We will see that they are stripes of silicene [10], a monolayer of silicon atoms packed into a two-dimensional (2D) honeycomb lattice [11], the challenging reflection in the silicon realm of graphene, a one-atom thick graphite sheet, presently the hottest new material in condensed matter physics and nanotechnology [12]. These silicene stripes can further cover the whole surface by self-assembly and lateral compaction to form a grating at the molecular scale with a pitch of just -2 (nm) [13]. In a sense, these stripes are typically alternatives to the ID metallic 5x2 superstructure induced by Au on the Si(1 11) surface [3,5]. In the following we will review their striking structural features and electronic properties.

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“…18 An original surface-supported Si arrangement was later proposed by Cerdá et al 19 , based on density functional theory (DFT), rapidly confirmed by Prévot et al 20 using a combined GIXD-STM-DFT study: the Si NRs correspond to pentamer chains lying in the missing row troughs of the reconstructed Ag(110) surface. Apart from these studies, the Si DNR array, covering uniformly the whole Ag(110) surface, has been successfully used as a template for the growth of identical 1D nanostructures made of Co 21 , Mn 22 , 9,10phenanthrenequinone 23 or C 60 24 and the study of their magnetic properties in the case of Co 25 . Moreover, questions remain regarding the early stages of growth, especially concerning the role and the atomic structure of the Si nanodots observed by STM, considered as the precursor for the formation of SNRs.…”

Section: Introductionmentioning

confidence: 99%

Nanoscale investigation of Si nanoribbon growth on Ag(110)

Mansour

Parret

Masson

2018

Journal of Vacuum Science & Technology A

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We present a nanoscale investigation by means of scanning tunneling microscopy of Si nanostructure growth on the anisotropic silver (110) surface, in the submonolayer range. Four types of Si nanostructures are studied statistically as a function of the substrate temperature in the range 300 K to 500 K: isolated single-and double nanoribbons, which differ only by a factor of two in their width, and their respective bi-dimensional counterparts in the self-assembly regime. Our observations highlight different growth regimes controlled by kinetics. Below 320 K, the Si adatoms diffuse along the easy [11 0] direction, forming essentially isolated single nanoribbons randomly distributed on the silver terraces. At higher temperatures, transverse diffusion along the [001] direction is activated and a competition between the growth of self-assembled single nanoribbons and isolated double nanoribbons is observed. Above 440 K, a transition from one-to two-dimensional double nanoribbon growth is evidenced. At 490 K, the Si deposition results in the formation of massively self-assembled double nanoribbons. Based on Arrhenius analyses, activation barriers are found to be (125 + 15) meV and (210 + 20) meV for the formation of isolated Si nanoribbons and self-assembled Si double nanoribbons, respectively. Our results allow for a better understanding of the kinetic limiting processes which determine the submonolayer morphology and illustrate the role played by the missing row reconstruction of the Ag(110) surface in the formation of extended Si nanoribbon arrays.

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One-dimensional organic nanostructures: A novel approach based on the selective adsorption of organic molecules on silicon nanowires

Cited by 23 publications

References 20 publications

Interfacial Coupling and Electronic Structure of Two-Dimensional Silicon Grown on the Ag(111) Surface at High Temperature

Interfacial Coupling and Electronic Structure of Two-Dimensional Silicon Grown on the Ag(111) Surface at High Temperature

Graphene-like Silicon Nano-ribbons on the Silver (110) Surface

Nanoscale investigation of Si nanoribbon growth on Ag(110)

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