Doping and quantum confinement effects in single Si nanocrystals observed by scanning tunneling spectroscopy

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DOIResolve DOI: http://doi.org/10.1021/nl400570p
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TypeArticle
Journal titleNano Letters
ISSN1530-6984
Volume13
Issue6
Pages25162521; # of pages: 6
SubjectBand gap variation; Capping ligands; Electronic levels; Quantum confinement effects; scanning-tunneling-spectroscopy; Silicon nanocrystals; surface-doping; Tunneling spectra; Charge transfer; Energy gap; Ligands; Nanocrystals; Photoluminescence; Quantum confinement; Scanning; Scanning tunneling microscopy; Spectroscopy; Silicon
AbstractWe have applied scanning tunneling spectroscopy in studies of the electronic level structure of surface-functionalized colloidal Si nanocrystals (Si-NCs) as a function of their size for various capping ligands. The energy gaps extracted from the tunneling spectra increase with decreasing NC size, manifesting the effect of quantum confinement. This is consistent with the blueshift revealed by photoluminescence (PL) from dodecene functionalized Si-NCs. The tunneling spectra measured on NCs functionalized with NH 4Br or allylamine show band-edge shifts toward higher energies, akin to p-type doping. This behavior can be accounted for by the combined contributions of the ligands' dipole moments and charge transfer between a Si-NC and its surface groups. Concomitantly, size-independent PL spectra, which cannot be associated with NC band gap variations, were observed for the latter Si-NCs. © 2013 American Chemical Society.
Publication date
LanguageEnglish
AffiliationNational Research Council Canada (NRC-CNRC); Security and Disruptive Technologies
Peer reviewedYes
NPARC number21271837
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Record identifierd6c0940d-0c97-437c-a62a-4f624ba4e8f9
Record created2014-04-23
Record modified2016-05-09
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