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|Title:||Real time dynamics of Si magic clusters mediating phase transformation: Si(111)-(1 × 1) to (7 × 7) reconstruction revisited|
Scanning tunneling microscope
|Citation:||Ong, W.J., Tok, E.S. (2012-07). Real time dynamics of Si magic clusters mediating phase transformation: Si(111)-(1 × 1) to (7 × 7) reconstruction revisited. Surface Science 606 (13-14) : 1037-1044. ScholarBank@NUS Repository. https://doi.org/10.1016/j.susc.2012.02.025|
|Abstract:||Using Scanning Tunneling Microscope (STM), we show that the surface undergoes phase transformation from disordered "1 × 1" to (7 × 7) reconstruction which is mediated by the formation of Si magic clusters. Mono-disperse Si magic clusters of size ∼ 13.5 ± 0.5 Å can be formed by heating the Si(111) surface to 1200°C and quenching it to room temperature at cooling rates of at least 100°C/min. The structure consists of 3 tetra-clusters of size ∼ 4.5 similar to the Si magic clusters that were formed from Si adatoms deposited by Si solid source on Si(111)-(7 × 7) . Using real time STM scanning to probe the surface at ∼ 400°C, we show that Si magic clusters pop up from the (1 × 1) surface and form spontaneously during the phase transformation. This is attributed to the difference in atomic density between "disordered 1 × 1" and (7 × 7) surface structures which lead to the release of excess Si atoms onto the surface as magic clusters. © 2012 Elsevier B.V.|
|Source Title:||Surface Science|
|Appears in Collections:||Staff Publications|
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