Please use this identifier to cite or link to this item:
|Title:||Self-assembly, dynamics, and structure of Si magic clusters|
|Citation:||Ong, W., Tok, E.S., Johll, H., Kang, H.C. (2009-06-29). Self-assembly, dynamics, and structure of Si magic clusters. Physical Review B - Condensed Matter and Materials Physics 79 (23) : -. ScholarBank@NUS Repository. https://doi.org/10.1103/PhysRevB.79.235439|
|Abstract:||We demonstrate the preferential formation and self-assembly of monodisperse Si magic clusters (X4) of size ∼13.5±0.5 on Si (111) - (7×7) surface using scanning tunneling microscope. The growth process is observed to occur via a stepwise assembly of planarized Si tetramers (X1) formed from Si adatoms deposited at room temperature, leading to Si tetraclusters (X2) (size ∼4.6±0.5) and culminating in tetracluster dimer (X3) and trimer (X4) formations as the surface is being annealed progressively to 150°C. The respective cluster species density distribution at each annealing temperature also shows the preferential formation of X1 → X2 → X3 → X4 at higher temperatures, which we describe using surface reaction schemes; X1 → X2, X2 + X2 → X3, and X2 + X3 → X4. We determine the activation and formation energies for respective cluster species and elucidate the formation energetics and dynamics of tetraclusters which function unequivocally as fundamental building blocks in the self-assembly of stable Si magic clusters. Finally, we resolve the structure of the Si magic cluster to comprise three tetraclusters or n=12 Si atoms taking into consideration (i) cluster symmetry and alignment, (ii) close packing, and (iii) minimization of dangling bonds. © 2009 The American Physical Society.|
|Source Title:||Physical Review B - Condensed Matter and Materials Physics|
|Appears in Collections:||Staff Publications|
Show full item record
Files in This Item:
There are no files associated with this item.
checked on Sep 17, 2018
WEB OF SCIENCETM
checked on Sep 5, 2018
checked on Jul 27, 2018
Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.