Thin noble metal films on Si (111) investigated by optical second-harmonic generation and photoemission

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

“…2 That is also clear from the absence of the Cu͑111͒ surface state in the data in Figs. The structures of the overlayers are close to those obtained for growth on bulk metal surfaces.…”

“…It is important to realize, however, that the copper silicide-like buffer layer does not have the same properties as bulk Cu͑111͒ as previous investigations have shown. 2 It might in principle be advantageous to use an even thinner Cu buffer layer with the first QW level at higher binding energy. 2 and 5.…”

“…After annealing at room temperature for several hours the valence band spectra shown in Fig. 2 The decay of the peak of the Cu d band around 3.5 eV is shown in the inset. At this energy the cross section of the Cu valence band excitation is much higher than that of Ag.…”

“…2 This was deduced from observations of the sharpness of quantum well ͑QW͒ resonances in a 10 monolayer ͑ML͒ Ag film grown on a wedge-shaped Cu film with thickness varying from 0 to 20 ML. 2 This was deduced from observations of the sharpness of quantum well ͑QW͒ resonances in a 10 monolayer ͑ML͒ Ag film grown on a wedge-shaped Cu film with thickness varying from 0 to 20 ML.…”