Room-temperature deposition and growth of Au on clean and oxygen passivated Si(111) surfaces investigated by optical second-harmonic generation

Kjeld Pedersen*, Per Morgen

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Abstrakt

Room-temperature deposition and growth of Au on Si(111) is investigated by means of optical second-harmonic generation. The process on the clean 7×7 surface is compared under identical conditions to that of the oxygen passivated surface. Ordered Au/Si interfaces occur in both cases. For the 7 × 7 surface the interface ordering starts after deposition of 4 monolayers, completing the formation of a phase with some dissolved Si, after which a continuous Au film grows between the substrate and the mixed phase. Oxygen passivation causes interface ordering from a lower Au coverage and a considerably higher degree of interface order. Oscillating second-harmonic generation intensities versus coverage with periods in the 12-17 monolayer range show that quantum well states formed in the Au film are responsible for the second-harmonic signal. The annealing behaviours of the Au/Si structures are also studied, and discussed with the inclusion of photoemission results.

OriginalsprogEngelsk
TidsskriftJournal of Physics Condensed Matter
Vol/bind9
Udgave nummer44
Sider (fra-til)9497-9506
Antal sider10
ISSN0953-8984
DOI
StatusUdgivet - 3. nov. 1997

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