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Title: Self-assembly, dynamics, and structure of Si magic clusters
Authors: Ong, W.
Tok, E.S. 
Johll, H.
Kang, H.C. 
Issue Date: 29-Jun-2009
Source: 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.
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
ISSN: 10980121
DOI: 10.1103/PhysRevB.79.235439
Appears in Collections:Staff Publications

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