Direct Evaluation of the Quantum Confinement Effect in Single Isolated Ge Nanocrystals

Oded Millo; Isacc Balberg; Doron Azulay; Tapas K. Purkait; Anindya K. Swarnakar; Eric Rivard; Jonathan G.C. Veinot

doi:10.1021/acs.jpclett.5b01541

Direct Evaluation of the Quantum Confinement Effect in Single Isolated Ge Nanocrystals

Oded Millo^*, Isacc Balberg, Doron Azulay, Tapas K. Purkait, Anindya K. Swarnakar, Eric Rivard, Jonathan G.C. Veinot

^*Corresponding author for this work

Racah Institute of Physics

Research output: Contribution to journal › Article › peer-review

38 Scopus citations

Abstract

To 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.

Original language	American English
Pages (from-to)	3396-3402
Number of pages	7
Journal	Journal of Physical Chemistry Letters
Volume	6
Issue number	17
DOIs	https://doi.org/10.1021/acs.jpclett.5b01541
State	Published - 14 Aug 2015

Bibliographical note

Publisher Copyright:
© 2015 American Chemical Society.

Keywords

band gap
germanium nanocrystals
quantum confinement
scanning tunneling spectroscopy

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10.1021/acs.jpclett.5b01541

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title = "Direct Evaluation of the Quantum Confinement Effect in Single Isolated Ge Nanocrystals",

abstract = "To 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.",

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AU - Swarnakar, Anindya K.

AU - Rivard, Eric

AU - Veinot, Jonathan G.C.

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AB - To 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.

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Direct Evaluation of the Quantum Confinement Effect in Single Isolated Ge Nanocrystals

Abstract

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Keywords

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