Ba deposition on Si (1 0 0)2 × 1

Vlachos, D.; Kamaratos, M.; Papageorgopoulos, C.A.

doi:10.1016/0038-1098(94)90337-9

Cited by 33 publications

(21 citation statements)

References 27 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Submonolayer surface phases of Ba/ Si͑001͒ and Sr/ Si͑001͒ have been studied previously by low-energy electron diffraction ͑LEED͒, [6][7][8][9][10][11][12] Auger electron spectroscopy ͑AES͒, 8,11,12 reflection high energy electron diffraction ͑RHEED͒, 13 scanning tunneling microscopy ͑STM͒, [14][15][16][17][18][19] angle-integrated ultraviolet photoelectron spectroscopy ͑AIUPS͒, 20 ion scattering, 21 x-ray photoemission spectroscopy ͑XPS͒, 22 x-ray standing waves ͑XSW͒, 23,24 and density functional theory ͑DFT͒ calculations. 5,17,[25][26][27] Most of the atomic-scale structural models proposed for the various short and long-range ordered AEM/Si͑001͒ surface structures observed at AEM coverages between 0 and 1 / 2 ML consist of individual AEM adatoms occupying valley-bridge sites on a dimerized Si͑001͒ surface.…”

Section: Introductionmentioning

confidence: 99%

X-ray standing wave investigation of submonolayer barium and strontium surface phases on Si(001)

et al. 2005

View full text Add to dashboard Cite

Submonolayer ͑2 ϫ 1͒ Ba/ Si͑001͒ and ͑2 ϫ 1͒ Sr/ Si͑001͒ surface phases have been studied with normal Si͑004͒ and off-normal Si͑022͒ x-ray standing wave ͑XSW͒ measurements. These results are compared to previous XSW measurements of a ͑2 ϫ 3͒ phase of Sr on Si͑001͒. The ͑004͒ and ͑022͒ coherent positions indicate that alkaline-earth metal ͑AEM͒ atoms occupy the same type of high symmetry site in the ͑2 ϫ 1͒ Ba/ Si͑001͒, ͑2 ϫ 1͒ Sr/ Si͑001͒, and ͑2 ϫ 3͒ Sr/ Si͑001͒ surface phases. The difference between the AEM adatom heights measured for the ͑2 ϫ 1͒ Ba/ Si͑001͒ and ͑2 ϫ 1͒ Sr/ Si͑001͒ phases is consistent with the difference in the ionic radii of Ba and Sr. Consideration of the nearest neighbor AEM-Si bond lengths that would result from AEM atoms sitting on symmetrically dimerized Si͑001͒ at the height specified by the Ba and Sr coherent positions strongly suggests that the AEM atoms occupy valley-bridge sites.

show abstract

Section: Introductionmentioning

confidence: 99%

X-ray standing wave investigation of submonolayer barium and strontium surface phases on Si(001)

et al. 2005

View full text Add to dashboard Cite

show abstract

“…In contrast, little attention has been paid to the alkaline earth metals such as Ba, although the element in many aspects behaves similarly to the AM. 7 According to the limited reports obtained from various techniques such as x-ray photoelectron spectroscopy ͑XPS͒, 8,9 Auger electron spectroscopy ͑AES͒, 10,11 low-energy electron diffraction ͑LEED͒, [10][11][12] thermal desorption spectroscopy ͑TDS͒, 10,11,13 and metastable-atom deexcitation spectroscopy ͑MDS͒, 10,13 the behaviors of the Ba/Si(001)2ϫ1 interface can be summarized as ͑i͒ Ba grown layer by layer, ͑ii͒ ionic interaction between the first Ba overlayer and the silicon surface, leading a charge transfer from the former to the latter, ͑iii͒ the second overlayer and above having a metallic character, and ͑iv͒ no silicide formation at room temperature. The present high-resolution synchrotron radiation photoemission work on a clean Ba/Si(001)2ϫ1 interface found actually that ionic interaction does not occur, and the Ba silicides can be formed at room temperature, as long as the substrate surface is atomically clean.…”

mentioning

confidence: 99%

“…Thus, the previous conclusion of an ionic interaction due to the charge transfer is denied. 10,11,13 Instead, the polarized model is more appropriate for the Ba/Si system. 24 The present finding of Ba-silicides formation at room temperature is in great contrast to all the previous reports, which had them shown only in an annealed film.…”

mentioning

confidence: 99%

Synchrotron-radiation photoemission study of Ba on aSi(001)2×1surface

Cheng

Hong

1998

Phys. Rev. B

View full text Add to dashboard Cite

A synchrotron-radiation photoemission study of Ba deposited on a clean Si(001)2ϫ1 surface at room temperature is presented. Upon Ba adsorption, the maximum drop in work function is about 2.3 eV. At submonolayer coverage, the asymmetric dimers on the surface are preserved. Near to one monolayer, however, they become symmetric. In the meantime, barium silicides start to form, first the monosilicide followed by the disilicide with increasing coverage. The Si 2p core-level photoemission spectra clearly exhibit these monosilicide and disilicide components having a surface core-level shift of 1.05 and 1.84 eV, respectively.

show abstract

“…4,5,9,[11][12][13][14][15][16][17][18][19][20][21][22][23][24][25][26][27] The key question regarding these phases is whether they are simple alkaline-earth adatom structures or more complex surface alloys. Adatom models 8,28 fail to reproduce STM images of the (3×2) phase, 17,25,27 while alloy models 9,10,25 require significant Si dimer movement to occur at temperatures well below those typically required for mass transport on Si surfaces.…”

Section: Introductionmentioning

confidence: 99%

Formation of alkaline-earth template layers on Ge(100) for oxide heteroepitaxy: Self-organization of ordered islands and trenches

et al. 2011

View full text Add to dashboard Cite

The first step required for oxide heteroepitaxy with atomically abrupt interfaces on Si and Ge(100) is the formation of an alkaline earth template layer. The atomic structure of this template layer on Ge(100) was characterized using scanning tunneling microscopy (STM) and electron diffraction. At elevated temperatures, Sr immediately roughens the surface; a transition that can be associated with Sr displacing Ge from the surface. With increasing Sr coverage a series of ordered (3×4), (3×2), (9×1) and (6×1) phases were observed. Transitions between these phases were accompanied by morphological changes: formation of the (3×4) phase smoothed surface; transition to a local (3×2) ordering was accompanied by trench formation; ordering of the trenches led to the (9×1) structure; and finally the (6×1) structure was characterized by atomic rows.For both Sr and Ba, highly ordered arrays of one-dimensional islands could be produced with double height steps preventing orthogonal domain formation. We associate the morphological transitions with strain relief of the surface phases and interactions of step ledges.

show abstract

Ba deposition on Si (1 0 0)2 × 1

Cited by 33 publications

References 27 publications

X-ray standing wave investigation of submonolayer barium and strontium surface phases on Si(001)

X-ray standing wave investigation of submonolayer barium and strontium surface phases on Si(001)

Synchrotron-radiation photoemission study of Ba on aSi(001)2×1surface

Formation of alkaline-earth template layers on Ge(100) for oxide heteroepitaxy: Self-organization of ordered islands and trenches

Contact Info

Product

Resources

About