Epitaxial growth of thin Ag and Au films on Si(111) using thin copper silicide buffer layers

Pedersen, Kjeld; Morgen, Per; Pedersen, Thomas Garm; Li, Zheshen; Hoffmann, Søren Vrønning

doi:10.1116/1.1564035

Cited by 7 publications

(3 citation statements)

References 23 publications

(26 reference statements)

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“…This interlayer relaxes the lattice mismatch between Cu and Si, enabling epitaxial growth . The epitaxial growth of silver (Ag) thin films on copper silicide interlayers has also been reported. , However, epitaxial Ag thin films prepared using this approach exhibited excessive hydrocarbon selectivities uncharacteristic of Ag at potentials cathodic of −1 V vs RHE (see section SI-7). Ion-scattering spectroscopy (ISS) revealed that this is due to the presence of Cu on the surface of these electrodes after CO 2 reduction, which most likely reaches the electrode surface as a consequence of adsorbate induced segregation from the copper silicide interlayer .…”

Section: Resultsmentioning

confidence: 99%

Influence of Atomic Surface Structure on the Activity of Ag for the Electrochemical Reduction of CO₂ to CO

et al. 2019

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The present work was undertaken to elucidate the facet-dependent activity of Ag for the electrochemical reduction of CO 2 to CO. To this end, CO 2 reduction was investigated over Ag thin films with (111), (100), and (110) orientations prepared via epitaxial growth on single-crystal Si wafers with the same crystallographic orientations. This preparation technique yielded larger area electrodes than can be achieved using single-crystals, which enabled the electrocatalytic activity of the corresponding Ag surfaces to be quantified in the Tafel regime. The Ag(110) thin films exhibited higher CO evolution activity compared to the Ag(111) and Ag(100) thin films, consistent with previous single-crystal studies. Density functional theory calculations suggest that CO 2 reduction to CO is strongly facet-dependent, and that steps are more active than highly coordinated terraces. This is the result of both a higher binding energy of the key intermediate COOH as well as an enhanced double-layer electric field stabilization over undercoordinated surface atoms located at step edge defects. As a consequence, step edge defects likely dominate the CO 2 reduction activity observed over the Ag(111) and Ag(100) thin films. The higher activity observed over the Ag(110) thin film is then related to the larger density of undercoordinated sites compared to the Ag(111) and Ag(100) thin films. Our conclusion that undercoordinated sites dominate the CO 2 reduction activity observed over close-packed surfaces highlights the need to consider the contribution of such defects in studies of single-crystal electrodes.

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Section: Resultsmentioning

confidence: 99%

Influence of Atomic Surface Structure on the Activity of Ag for the Electrochemical Reduction of CO₂ to CO

et al. 2019

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“…We have observed the wavevector quantization in LaSrCuO films thinner than 12 unit cells grown on SrTiO 3 substrates. Low energy dispersions were determined in situ for different photon energies by angle resolved photoemission spectroscopy.…”

Section: Fermi Surface Determination From Wavevector Quantization In mentioning

confidence: 80%

“…[1][2][3][4] The effect is due to the discrete nature of the energy spectra associated with the standing wave solutions of the Schrödinger equation in a finite medium. 5 However, due to the roughness of their surfaces and interfaces, it is often not observed in very thin films.…”

Section: Fermi Surface Determination From Wavevector Quantization In mentioning

confidence: 99%

Fermi surface determination from wavevector quantization in LaSrCuO films

Ariosa

Cancellieri

Lin

et al. 2008

Applied Physics Letters

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We have observed the wavevector quantization in LaSrCuO films thinner than 12 unit cells grown on SrTiO3 substrates. Low energy dispersions were determined in situ for different photon energies by angle resolved photoemission spectroscopy. From the wavevector quantization, we extract three dimensional dispersions within a tight-binding model and obtain the Fermi surface topology, without resorting to the nearly free-electron approximation. Such method can be extended to similar confined electron nanostructures.

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Nanostructured Films on Silicon Surfaces

Morgen¹,

Bahari²,

Pedersen

2006

Functional Properties of Nanostructured Materials

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Epitaxial growth of thin Ag and Au films on Si(111) using thin copper silicide buffer layers

Abstract: Articles you may be interested inSchottky barrier height measurements of Cu/Si(001), Ag/Si(001), and Au/Si(001) interfaces utilizing ballistic electron emission microscopy and ballistic hole emission microscopy

Cited by 7 publications

References 23 publications

Influence of Atomic Surface Structure on the Activity of Ag for the Electrochemical Reduction of CO₂ to CO

Influence of Atomic Surface Structure on the Activity of Ag for the Electrochemical Reduction of CO₂ to CO

Fermi surface determination from wavevector quantization in LaSrCuO films

Nanostructured Films on Silicon Surfaces

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Epitaxial growth of thin Ag and Au films on Si(111) using thin copper silicide buffer layers

Abstract: Articles you may be interested inSchottky barrier height measurements of Cu/Si(001), Ag/Si(001), and Au/Si(001) interfaces utilizing ballistic electron emission microscopy and ballistic hole emission microscopy

Cited by 7 publications

References 23 publications

Influence of Atomic Surface Structure on the Activity of Ag for the Electrochemical Reduction of CO2 to CO

Influence of Atomic Surface Structure on the Activity of Ag for the Electrochemical Reduction of CO2 to CO

Fermi surface determination from wavevector quantization in LaSrCuO films

Nanostructured Films on Silicon Surfaces

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Product

Resources

About

Influence of Atomic Surface Structure on the Activity of Ag for the Electrochemical Reduction of CO₂ to CO

Influence of Atomic Surface Structure on the Activity of Ag for the Electrochemical Reduction of CO₂ to CO