Details
| Original language | English |
|---|---|
| Pages (from-to) | 2785-2794 |
| Number of pages | 10 |
| Journal | Surface Science |
| Volume | 600 |
| Issue number | 13 |
| Publication status | Published - 22 May 2006 |
Abstract
Exploring ways for self-organized structuring of insulating thin films, we investigated the possibility to produce replicas of step trains, given by a vicinal Si(0 0 1)-4°[1 1 0] surface, in layers of crystalline and perfectly lattice-matched Ba0.7Sr0.3O. For this purpose, we carried out high-resolution spot profile analyses in low-energy electron diffraction (SPA-LEED) both on flat Si(0 0 1) and on Si(0 0 1)-4°[1 1 0]. Oxide layers were generated by evaporating the metals in oxygen ambient pressure with the sample at room temperature. Our G(S) analysis of these mixed oxide layers reveals a strong influence of local compositional fluctuations of Sr and Ba ions and their respective scattering phases, which appears as an unphysically large variation of layer distances. Nevertheless, we are able to show that quite smooth and closed oxide films are obtained with an rms roughness of about 1 ML. These Ba0.7Sr0.3O films directly follow the step train of Sr-modified vicinal Si surfaces that form (1 1 3) oriented facets after adsorption of a monolayer of Sr. This proves that self-organized structuring of insulating films can indeed be an effective method.
Keywords
- Growth, Insulating surfaces, LEED, Oxides, Photoelectron spectroscopy
ASJC Scopus subject areas
- Physics and Astronomy(all)
- Condensed Matter Physics
- Physics and Astronomy(all)
- Surfaces and Interfaces
- Materials Science(all)
- Surfaces, Coatings and Films
- Materials Science(all)
- Materials Chemistry
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In: Surface Science, Vol. 600, No. 13, 22.05.2006, p. 2785-2794.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - Surface morphology of epitaxial lattice-matched Ba0.7Sr0.3O on Si(0 0 1) and vicinal Si(0 0 1)-4°[1 1 0] substrates
AU - Zachariae, J.
AU - Pfnür, Herbert
N1 - Funding information: We thank especially Dr. Wormeester, University of Twente, for software support (WinSpa32). Helpful discussions with Prof. Wollschläger and Dr. Tegenkamp and a critical reading of the manuscript by Prof. Wollschläger are gratefully acknowledged. This work was supported by the Deutsche Forschungsgemeinschaft (Grant No. Pf238/18).
PY - 2006/5/22
Y1 - 2006/5/22
N2 - Exploring ways for self-organized structuring of insulating thin films, we investigated the possibility to produce replicas of step trains, given by a vicinal Si(0 0 1)-4°[1 1 0] surface, in layers of crystalline and perfectly lattice-matched Ba0.7Sr0.3O. For this purpose, we carried out high-resolution spot profile analyses in low-energy electron diffraction (SPA-LEED) both on flat Si(0 0 1) and on Si(0 0 1)-4°[1 1 0]. Oxide layers were generated by evaporating the metals in oxygen ambient pressure with the sample at room temperature. Our G(S) analysis of these mixed oxide layers reveals a strong influence of local compositional fluctuations of Sr and Ba ions and their respective scattering phases, which appears as an unphysically large variation of layer distances. Nevertheless, we are able to show that quite smooth and closed oxide films are obtained with an rms roughness of about 1 ML. These Ba0.7Sr0.3O films directly follow the step train of Sr-modified vicinal Si surfaces that form (1 1 3) oriented facets after adsorption of a monolayer of Sr. This proves that self-organized structuring of insulating films can indeed be an effective method.
AB - Exploring ways for self-organized structuring of insulating thin films, we investigated the possibility to produce replicas of step trains, given by a vicinal Si(0 0 1)-4°[1 1 0] surface, in layers of crystalline and perfectly lattice-matched Ba0.7Sr0.3O. For this purpose, we carried out high-resolution spot profile analyses in low-energy electron diffraction (SPA-LEED) both on flat Si(0 0 1) and on Si(0 0 1)-4°[1 1 0]. Oxide layers were generated by evaporating the metals in oxygen ambient pressure with the sample at room temperature. Our G(S) analysis of these mixed oxide layers reveals a strong influence of local compositional fluctuations of Sr and Ba ions and their respective scattering phases, which appears as an unphysically large variation of layer distances. Nevertheless, we are able to show that quite smooth and closed oxide films are obtained with an rms roughness of about 1 ML. These Ba0.7Sr0.3O films directly follow the step train of Sr-modified vicinal Si surfaces that form (1 1 3) oriented facets after adsorption of a monolayer of Sr. This proves that self-organized structuring of insulating films can indeed be an effective method.
KW - Growth
KW - Insulating surfaces
KW - LEED
KW - Oxides
KW - Photoelectron spectroscopy
UR - http://www.scopus.com/inward/record.url?scp=33746940343&partnerID=8YFLogxK
U2 - 10.1016/j.susc.2006.05.002
DO - 10.1016/j.susc.2006.05.002
M3 - Article
AN - SCOPUS:33746940343
VL - 600
SP - 2785
EP - 2794
JO - Surface Science
JF - Surface Science
SN - 0039-6028
IS - 13
ER -