Direct evaluation of the quantum confinement effect in single isolated Ge nanocrystals

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DOIResolve DOI: http://doi.org/10.1021/acs.jpclett.5b01541
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TypeArticle
Journal titleThe Journal of Physical Chemistry Letters
ISSN1948-7185
Volume6
Issue17
Pages33963402
Subjectband gap; germanium nanocrystals; quantum confinement; scanning tunneling spectroscopy
AbstractTo address the yet open question regarding the nature of quantum confinement in Ge nanocrystals (Ge NCs) we employed scanning tunneling spectroscopy to monitor the electronic structure of individual isolated Ge NCs as a function of their size. The (single-particle) band gaps extracted from the tunneling spectra increase monotonically with decreasing nanocrystal size, irrespective of the capping ligands, manifesting the effect of quantum confinement. Band-gap widening of ∼1 eV with respect to the bulk value was observed for Ge-NCs 3 nm in diameter. The picture emerging from comparison with theoretical calculations and other experimental results is discussed.
Publication date
LanguageEnglish
AffiliationNational Institute for Nanotechnology; National Research Council Canada
Peer reviewedYes
NPARC number23000828
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Record identifierede33cd6-06fe-45d7-9a19-a6230bbab7b3
Record created2016-10-17
Record modified2016-10-17
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