Real-Time Observation of Reactive Spreading of Gold on Silicon

Details Real-Time Observation of Reactive Spreading of Gold on Silicon Real-Time Observation of Reactive Spreading of Gold on Silicon

2009-12-04

arxiv.org/abs/0912.0761v3

Phys. Rev. Lett. 103 (2009), 256102

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

4 pages, 4 figures

Scientific paper

10.1103/PhysRevLett.103.256102

The spreading of a bilayer gold film propagating outward from gold clusters, which are pinned to clean Si(111), is imaged in real time by low energy electron microscopy. By monitoring the evolution of the boundary of the gold film at fixed temperature, a linear dependence of the spreading radius on time is found. The measured spreading velocities in the temperature range of 800 < T < 930 K varied from below 100 pm/s to 50 nm/s. We show that the spreading rate is limited by the reaction to form Au silicide, and the spreading velocity is likely regulated by the reconstruction of the gold silicide that occurs at the interface.

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