Journal
ACS NANO
Volume 8, Issue 12, Pages 12676-12681Publisher
AMER CHEMICAL SOC
DOI: 10.1021/nn5056223
Keywords
X-ray reflectivity; thin films; native silicon oxide; self-assembled monolayers
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Funding
- DFG research unit 1878
- US-Israel Binational Science Foundation, Jerusalem
- Division of Materials Sciences (DOE) [DE-AC02-76CH0016]
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X-ray reflectivity measurements of increasingly more complex interfaces involving silicon (001) substrates reveal the existence of a thin low-density layer intruding between the single-crystalline silicon and the amorphous native SiO2 terminating it. The importance of accounting for this layer in modeling silicon/liquid interfaces and silicon-supported monolayers is demonstrated by comparing fits of the measured reflectivity curves by models including and excluding this layer. The inclusion of this layer, with 6-8 missing electrons per silicon unit cell area, consistent with one missing oxygen atom whose bonds remain hydrogen passivated, is found to be particularly important for an accurate and high-resolution determination of the surface normal density profile from reflectivities spanning extended momentum transfer ranges, now measurable at modern third-generation synchrotron sources.
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