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Manipulating Ge quantum dots on ultrathin Si x Ge1−x oxide films using scanning tunneling microscope tips
- Source :
-
Surface Science . Sep2006, Vol. 600 Issue 17, p3456-3460. 5p. - Publication Year :
- 2006
-
Abstract
- Abstract: Germanium quantum dots (QDs) were extracted from ultrathin Si x Ge1−x oxide films using scanning tunneling microscope (STM) tips. The extraction was most efficiently performed at a positive sample bias voltage of +5.0V. The tunneling current dependence of the extraction efficiency was explained by the electric field evaporation transfer mechanism for positive Ge ions from QDs to STM tips. Ge QDs (∼7nm) were formed and isolated spatially by extracting the surrounding Ge QDs with an ultrahigh density of >1012 cm−2. Scanning tunneling spectroscopy of the spatially-isolated QDs revealed that QDs with an ultrahigh density are electrically-isolated from the adjacent dots. [Copyright &y& Elsevier]
- Subjects :
- *MINING engineering
*EXCAVATION
*SPECTRUM analysis
*EPITAXY
Subjects
Details
- Language :
- English
- ISSN :
- 00396028
- Volume :
- 600
- Issue :
- 17
- Database :
- Academic Search Index
- Journal :
- Surface Science
- Publication Type :
- Academic Journal
- Accession number :
- 22278674
- Full Text :
- https://doi.org/10.1016/j.susc.2006.06.035