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How Big Does a Si Nanocluster Favor Bulk Bonding Geometry?

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journal contribution
posted on 10.02.2016, 20:34 authored by Wen-Hua Yang, Wen-Cai Lu, C. Z. Wang, K. M. Ho
Low-energy structures of silicon nanoclusters (NCs) at the size about 220 atoms were studied using tight-binding and first-principles calculations. The structures including bulk-like, icosahedral, bucky–diamond, and onion-like structures have been extensively investigated. The results showed that the bulk-like structures are energetically favorable for the Si220 NCs. Our calculations also showed that although the icosahedral structure is energetically competitive with the bulk-like structures at the special size of 220 atoms, the bulk-like structures are more robust as the number of atoms varies. We also studied the structure-energy trend for Si NCs as the function of cluster size and the structural transition to bulk-like motif occur at the size range of 173–215 atoms.