Toward a Detailed Understanding of Si(111)-7×7 Surface and Adsorbed Ge Nanostructures: Fabrications, Structures, and Calculations
Joint Authors
Guo, Hai-Ming
Wang, Ye-Liang
Qin, Zhi-Hui
Gao, Hong-Jun
Ma, Hai-Feng
Source
Issue
Vol. 2008, Issue 2008 (31 Dec. 2008), pp.1-19, 19 p.
Publisher
Hindawi Publishing Corporation
Publication Date
2008-02-19
Country of Publication
Egypt
No. of Pages
19
Main Subjects
Abstract EN
Firstly, both the rest atoms and the adatoms of Si(111)-7×7 surface are observed simultaneously by scanning tunneling microscopy (STM) when the sample bias voltages are kept less than − 0.7 V.
The visibility of the rest atoms is rationalized by first-principle calculations and a very sharper tip can resolve them.
Secondly, the behaviors of various Ge nanostructures fabricated on Si(111)-7×7, ranging from the initial adsorption sites of individual Ge atoms to the aggregation patterns of Ge nanoclusters, and then to 2D extended Ge islands, are comprehensively investigated by STM.
The individual Ge atoms tend to substitute for Si adatoms at Si(111)-7×7 with the preference of corner adatoms in the faulted half unit when keeping substrate at 150∘C.
With increasing Ge coverage, individual Ge atoms and Ge nanoclusters coexist on the substrate.
Subsequently, the density of Ge nanoclusters increase and cluster-distribution becomes gradually regular with the formation of final 2D extended hexagonal configuration.
When keeping the substrate at 300∘C, Ge islands consisting of more complicated reconstructions with intermixing Ge/Si components are present on the substrate.
The detail structural characterizations and the bonding nature of the observed Ge nanostructures are enunciated by the first-principle calculations.
American Psychological Association (APA)
Wang, Ye-Liang& Guo, Hai-Ming& Qin, Zhi-Hui& Ma, Hai-Feng& Gao, Hong-Jun. 2008. Toward a Detailed Understanding of Si(111)-7×7 Surface and Adsorbed Ge Nanostructures: Fabrications, Structures, and Calculations. Journal of Nanomaterials،Vol. 2008, no. 2008, pp.1-19.
https://search.emarefa.net/detail/BIM-988115
Modern Language Association (MLA)
Wang, Ye-Liang…[et al.]. Toward a Detailed Understanding of Si(111)-7×7 Surface and Adsorbed Ge Nanostructures: Fabrications, Structures, and Calculations. Journal of Nanomaterials No. 2008 (2008), pp.1-19.
https://search.emarefa.net/detail/BIM-988115
American Medical Association (AMA)
Wang, Ye-Liang& Guo, Hai-Ming& Qin, Zhi-Hui& Ma, Hai-Feng& Gao, Hong-Jun. Toward a Detailed Understanding of Si(111)-7×7 Surface and Adsorbed Ge Nanostructures: Fabrications, Structures, and Calculations. Journal of Nanomaterials. 2008. Vol. 2008, no. 2008, pp.1-19.
https://search.emarefa.net/detail/BIM-988115
Data Type
Journal Articles
Language
English
Notes
Includes bibliographical references
Record ID
BIM-988115