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

41 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	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

Access to Document

10.1021/acs.jpclett.5b01541

Cite this

@article{396a66b7a13147ce9c57a61ea87e8a90,

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.",

keywords = "band gap, germanium nanocrystals, quantum confinement, scanning tunneling spectroscopy",

author = "Oded Millo and Isacc Balberg and Doron Azulay and Purkait, {Tapas K.} and Swarnakar, {Anindya K.} and Eric Rivard and Veinot, {Jonathan G.C.}",

note = "Publisher Copyright: {\textcopyright} 2015 American Chemical Society.",

year = "2015",

month = aug,

day = "14",

doi = "10.1021/acs.jpclett.5b01541",

language = "אנגלית",

volume = "6",

pages = "3396--3402",

journal = "Journal of Physical Chemistry Letters",

issn = "1948-7185",

publisher = "American Chemical Society",

number = "17",

}

TY - JOUR

T1 - Direct Evaluation of the Quantum Confinement Effect in Single Isolated Ge Nanocrystals

AU - Millo, Oded

AU - Balberg, Isacc

AU - Azulay, Doron

AU - Purkait, Tapas K.

AU - Swarnakar, Anindya K.

AU - Rivard, Eric

AU - Veinot, Jonathan G.C.

PY - 2015/8/14

Y1 - 2015/8/14

N2 - 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.

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.

KW - band gap

KW - germanium nanocrystals

KW - quantum confinement

KW - scanning tunneling spectroscopy

UR - http://www.scopus.com/inward/record.url?scp=84940919630&partnerID=8YFLogxK

U2 - 10.1021/acs.jpclett.5b01541

DO - 10.1021/acs.jpclett.5b01541

M3 - ???researchoutput.researchoutputtypes.contributiontojournal.article???

C2 - 26275992

AN - SCOPUS:84940919630

SN - 1948-7185

VL - 6

SP - 3396

EP - 3402

JO - Journal of Physical Chemistry Letters

JF - Journal of Physical Chemistry Letters

IS - 17

ER -

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

Abstract

Bibliographical note

Keywords

Access to Document

Other files and links

Fingerprint

Cite this