Argonne National Laboratory Center for Nanoscale Materials
An Office of Science User Facility
U.S. Department of Energy

Silicene? Silicon at the Two-Dimensional Limit

charge gradient microscopy diagram

A thorough investigation of silicon deposition on Ag(111) was performed by researchers in the Center for Nanoscale Materials' Electronic & Magnetic Materials & Devices Group and Northwestern University using advanced surface science characterization methods. Contrary to popular belief, the results showed that atomically thin sheets of silicene do not grow on Ag(111). Rather, a surface alloy phase of silicon with silver occurs until a critical concentration is reached and bulk Si(111) precipitates out. The Si(111) platelets are terminated with a well-known silver reconstruction. There is a clear electronic transition from metallic to near bulk-like semiconducting from the surface alloy phase to the Si(111) two-dimensional platelets (more>>)

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