Electron-beam assisted growth of hexagonal boron-nitride layer

Hwang, Bon‐Gang; Kwon, Jinhyeong; Lee, Myung Gyoon; Lim, So Young; Jeon, Seun; Kim, Sung Soo; Ham, Ungdon; Song, Young Jae; Kuk, Young

doi:10.1016/j.cap.2013.04.018

Cited by 8 publications

(8 citation statements)

References 27 publications

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“…To further unravel the elemental identities of the two types of GBs, LDOS measurements by STS combined with DFT calculations were performed. STS measurements on the perfect h-BN region reveal a band gap of ~ 5 eV (black line in Figure 4a), which is consistent with the reported electronic property of h-BN/Cu (111) 42,43,44. The STS spectra shown inFigure 4aare arithmetic average of several spectra…”

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confidence: 85%

Grain Boundary Structures and Electronic Properties of Hexagonal Boron Nitride on Cu(111)

Zou²,

et al. 2015

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Grain boundaries (GBs) of hexagonal boron nitride (h-BN) grown on Cu(111) were investigated by scanning tunneling microscopy/spectroscopy (STM/STS). The first experimental evidence of the GBs composed of square-octagon pairs (4|8 GBs) was given, together with those containing pentagon-heptagon pairs (5|7 GBs). Two types of GBs were found to exhibit significantly different electronic properties, where the band gap of the 5|7 GB was dramatically decreased as compared with that of the 4|8 GB, consistent with our obtained result from density functional theory (DFT) calculations. Moreover, the present work may provide a possibility of tuning the inert electronic property of h-BN via grain boundary engineering.

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confidence: 85%

Grain Boundary Structures and Electronic Properties of Hexagonal Boron Nitride on Cu(111)

Zou²,

et al. 2015

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“…The simultaneously acquired scanning tunnelling spectroscopy (STS) map (Fig. 1d) shows distinctively different [29][30][31][32]. The boundary on the right side (Fig.…”

Section: Resultsmentioning

confidence: 99%

Spatially resolved one-dimensional boundary states in graphene–hexagonal boron nitride planar heterostructures

et al. 2014

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Two-dimensional interfaces between crystalline materials have been shown to generate unusual interfacial electronic states in complex oxides. Recently, a one-dimensional interface has been realized in hexagonal boron nitride and graphene planar heterostructures, where a polar-on-nonpolar one-dimensional boundary is expected to possess peculiar electronic states associated with edge states of graphene and the polarity of boron nitride. Here we present a combined scanning tunnelling microscopy and first-principles theory study of the graphene-boron nitride boundary to provide a first glimpse into the spatial and energetic distributions of the one-dimensional boundary states down to atomic resolution. The revealed boundary states are about 0.6 eV below or above the Fermi level depending on the termination of the boron nitride at the boundary, and are extended along but localized at the boundary. These results suggest that unconventional physical effects similar to those observed at two-dimensional interfaces can also exist in lower dimensions.

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“…Atomically-thin hBN sheets attracted considerable interest as such spacer layers [18] and can promote site-dependent decoupling and adsorption [19,20], yielding access to optical transitions [21] as well as allowing for orbital-resolved STM imaging [19,[21][22][23]. For instance, hBN/Cu(111) [24][25][26][27] features a work function template with a moiré superstructure: Depending on the registry of the layer and substrate atoms, the surface is divided in areas of low and high local work function, denoted as "pores" and "wires", respectively [28][29][30][31]. In recent years, our group and others used hBN/Cu(111) to guide the selfassembly of porphyrins [28,32,33], decouple perylenetetracarboxylic dianhydride (PTCDA) aggregates [34], study interfacial charge transfer in binary phthalocyanine arrays [35], probe vibronic conductance in oligophenylenes [36], and control the charge state of F 16 CoPc [37].…”

Section: Introductionmentioning

confidence: 99%

Self-assembly and spectroscopic fingerprints of photoactive pyrenyl tectons on hBN/Cu(111)

Zimmermann¹,

Seufert²,

Đorđević³

et al. 2020

Beilstein J. Nanotechnol.

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The controlled modification of electronic and photophysical properties of polycyclic aromatic hydrocarbons by chemical functionalization, adsorption on solid supports, and supramolecular organization is the key to optimize the application of these compounds in (opto)electronic devices. Here, we present a multimethod study comprehensively characterizing a family of pyridin-4-ylethynyl-functionalized pyrene derivatives in different environments. UV–vis measurements in toluene solutions revealed absorption at wavelengths consistent with density functional theory (DFT) calculations, while emission experiments showed a high fluorescence quantum yield. Scanning tunneling microscopy (STM) and spectroscopy (STS) measurements of the pyrene derivatives adsorbed on a Cu(111)-supported hexagonal boron nitride (hBN) decoupling layer provided access to spatially and energetically resolved molecular electronic states. We demonstrate that the pyrene electronic gap is reduced with an increasing number of substituents. Furthermore, we discuss the influence of template-induced gating and supramolecular organization on the energies of distinct molecular orbitals. The selection of the number and positioning of the pyridyl termini in tetrasubstituted, trans- and cis-like-disubstituted derivatives governed the self-assembly of the pyrenyl core on the nanostructured hBN support, affording dense-packed arrays and intricate porous networks featuring a kagome lattice.

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Electron-beam assisted growth of hexagonal boron-nitride layer

Cited by 8 publications

References 27 publications

Grain Boundary Structures and Electronic Properties of Hexagonal Boron Nitride on Cu(111)

Grain Boundary Structures and Electronic Properties of Hexagonal Boron Nitride on Cu(111)

Spatially resolved one-dimensional boundary states in graphene–hexagonal boron nitride planar heterostructures

Self-assembly and spectroscopic fingerprints of photoactive pyrenyl tectons on hBN/Cu(111)

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