Mirror electron microscopy applied to the continuous local measurement of work-function variations

Babout, M; Guittard, C; Guivarch, Michel; Pantel, R.; Bujor, M.

doi:10.1088/0022-3727/13/7/011

Cited by 21 publications

(13 citation statements)

References 9 publications

(5 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…4). In order to confirm these results, we determined Φ values using a different procedure, 14,15 and obtained consistent results. An important factor that affects the work function of bilayer graphene is the in-plane orientation of the two layers, which we next discuss from the perspective of electronic structure calculations.…”

Section: Work Function Of Graphene Bilayers On Pdmentioning

confidence: 62%

Growth structure and work function of bilayer graphene on Pd(111)

et al. 2012

View full text Add to dashboard Cite

Using in situ low-energy electron microscopy and density functional theory, we studied the growth structure and work function of bilayer graphene on Pd(111). Low-energy electron diffraction analysis established that the two graphene layers have multiple rotational orientations relative to each other and the substrate plane. We observed heterogeneous nucleation and simultaneous growth of multiple, faceted layers prior to the completion of second layer. We propose that the facetted shapes are due to the zigzag-terminated edges bounding graphene layers growing under the larger overlying layers. We also found that the work functions of bilayer graphene domains are higher than those of monolayer graphene, and depend sensitively on the orientations of both layers with respect to the substrate. Based on first-principles simulations, we attribute this behavior to oppositely oriented electrostatic dipoles at the graphene/Pd and graphene/graphene interfaces, whose strengths depend on the orientations of the two graphene layers.

show abstract

Section: Work Function Of Graphene Bilayers On Pdmentioning

confidence: 62%

Growth structure and work function of bilayer graphene on Pd(111)

et al. 2012

View full text Add to dashboard Cite

show abstract

“…5(a), three normalized bright field IV-LEEM spectra taken from bare Ir and the two hBN island types are shown. By looking at the drop in electron reflectivity when increasing the electron energy, it is obvious that the examined areas have different work functions (WFs) [55]. We estimate the difference in the WF between Ir and triangular hBN island to be 0.98 eV, while it is larger for the trapezoidal island and amounts to 1.08 eV.…”

Section: Work Function and Interaction With Iridiummentioning

confidence: 90%

Microanalysis of single-layer hexagonal boron nitride islands on Ir(111)

Petrović

Hagemann²,

Hoegen

et al. 2017

Applied Surface Science

View full text Add to dashboard Cite

Large hexagonal boron nitride (hBN) single-layer islands of high crystalline quality were grown on Ir(111) via chemical vapor deposition (CVD) and have been studied with low-energy electron microscopy (LEEM). Two types of hBN islands have been observed that structurally differ in their shape and orientation with respect to iridium, where the former greatly depends on the iridium step morphology. Photoemission electron microscopy (PEEM) and IV-LEEM spectroscopy revealed that the two island types also exhibit different work functions and bindings to iridium, which provides an explanation for differences in their shape and growth modes. In addition, various temperatures were used for the CVD synthesis of hBN, and it was found that at temperatures higher than ~950 {\deg}C boron atoms, originating either from decomposed borazine molecules or disintegrated hBN islands, can form additional compact reconstructed regions. The presented results are important for advancement in synthesis of high-quality hBN and other boron-based layered materials, and could therefore expedite their technological implementation.Comment: 9 pages, 6 figure

show abstract

“…A series of images were recorded at room temperature to determine the mirror electron microscopy (MEM) mode/LEEM mode transition [14], [15]. The sample is biased to a negative potential close to that of the LEEM electron gun (-20 kV).…”

Section: Quantitative Differences In Their Work Functions-mem/leem Trmentioning

confidence: 99%

Local investigation of the emissive properties of LaB6–ZrB2 eutectics

et al. 2017

View full text Add to dashboard Cite

LaB 6-ZrB 2 composites obtained by directional solidification at eutectic composition have been investigated by low-energy electron microscopy (LEEM) and thermal emission electron microscopy (ThEEM). The transitions from the mirror electron microscopy mode to the LEEM mode for the hexa-and diborides indicate lower work functions of the two phases when embedded in the composite compared to the corresponding single phases. In the composite, the work function of the ZrB 2 fibers is similar to that of the matrix and ThEEM images display a brighter contrast for the fibers. This is explained by the thermally activated diffusion of La on the fiber surface.

show abstract

Mirror electron microscopy applied to the continuous local measurement of work-function variations

Cited by 21 publications

References 9 publications

Growth structure and work function of bilayer graphene on Pd(111)

Growth structure and work function of bilayer graphene on Pd(111)

Microanalysis of single-layer hexagonal boron nitride islands on Ir(111)

Local investigation of the emissive properties of LaB6–ZrB2 eutectics

Contact Info

Product

Resources

About