Z-contrast scanning transmission electron microscopy on self-assembled CdSe quantum dots in ZnSe and (Zn,Mn)Se matrices

Teya Topuria; Peter Möck; Nigel D. Browning; Lubov V. Titova; Malgorzata Dobrowolska; Sanghoon Lee; Jacek K. Furdyna

Z-contrast scanning transmission electron microscopy on self-assembled CdSe quantum dots in ZnSe and (Zn,Mn)Se matrices

Teya Topuria, Peter Möck, Nigel D. Browning, Lubov V. Titova, Malgorzata Dobrowolska, Sanghoon Lee, Jacek K. Furdyna

Research output: Contribution to journal › Conference article › peer-review

Abstract

Z-contrast imaging in the scanning transmission electron microscope (STEM) was employed to study single and multi-sheet arrangements of self-assembled CdSe quantum dots (QDs) in ZnSe and (Zn_0.9Mn_0.1)Se matrices. The negligible influence of strain field on Z-contrast images allow for an analysis of the shapes and sizes of a large number of QDs. Higher levels of self-ordering could be proven by such analyses in a sample for which a fractional monolayer of MnSe was deposited prior to the deposition of a single CdSe sheet, that subsequently self-assembled into three dimensional (3D) quantum dots. In the multi-sheet structure, we observed the co-existence of a variety of differently shaped, sized, and self-ordered Cd rich agglomerates. Several of these agglomerates showed different types of compositional modulation on the atomic scale. The advantages of using atomic resolution Z-contrast imaging in STEM for the elucidation of these modulations are demonstrated. Results of the standardless qualitative elemental mapping technique of Z-contrast STEM are in agreement with the results of semi-quantitative energy dispersive X-ray spectroscopy (EDS).

Original language	English
Pages (from-to)	J8.3.1-J8.3.6
Journal	Materials Research Society Symposium - Proceedings
Volume	642
Publication status	Published - 2001
Externally published	Yes
Event	Semiconductor Quantum Dots II - Boston, MA, United States Duration: 2000 Nov 27 → 2000 Nov 30

ASJC Scopus subject areas

Materials Science(all)
Condensed Matter Physics
Mechanics of Materials
Mechanical Engineering

Cite this

@article{bf0239bb91c74cc48b27e2c808b5302a,

title = "Z-contrast scanning transmission electron microscopy on self-assembled CdSe quantum dots in ZnSe and (Zn,Mn)Se matrices",

abstract = "Z-contrast imaging in the scanning transmission electron microscope (STEM) was employed to study single and multi-sheet arrangements of self-assembled CdSe quantum dots (QDs) in ZnSe and (Zn0.9Mn0.1)Se matrices. The negligible influence of strain field on Z-contrast images allow for an analysis of the shapes and sizes of a large number of QDs. Higher levels of self-ordering could be proven by such analyses in a sample for which a fractional monolayer of MnSe was deposited prior to the deposition of a single CdSe sheet, that subsequently self-assembled into three dimensional (3D) quantum dots. In the multi-sheet structure, we observed the co-existence of a variety of differently shaped, sized, and self-ordered Cd rich agglomerates. Several of these agglomerates showed different types of compositional modulation on the atomic scale. The advantages of using atomic resolution Z-contrast imaging in STEM for the elucidation of these modulations are demonstrated. Results of the standardless qualitative elemental mapping technique of Z-contrast STEM are in agreement with the results of semi-quantitative energy dispersive X-ray spectroscopy (EDS).",

author = "Teya Topuria and Peter M{\"o}ck and Browning, {Nigel D.} and Titova, {Lubov V.} and Malgorzata Dobrowolska and Sanghoon Lee and Furdyna, {Jacek K.}",

year = "2001",

language = "English",

volume = "642",

pages = "J8.3.1--J8.3.6",

journal = "Materials Research Society Symposium Proceedings",

issn = "0272-9172",

publisher = "Materials Research Society",

note = "Semiconductor Quantum Dots II ; Conference date: 27-11-2000 Through 30-11-2000",

}

TY - JOUR

T1 - Z-contrast scanning transmission electron microscopy on self-assembled CdSe quantum dots in ZnSe and (Zn,Mn)Se matrices

AU - Topuria, Teya

AU - Möck, Peter

AU - Browning, Nigel D.

AU - Titova, Lubov V.

AU - Dobrowolska, Malgorzata

AU - Lee, Sanghoon

AU - Furdyna, Jacek K.

PY - 2001

Y1 - 2001

N2 - Z-contrast imaging in the scanning transmission electron microscope (STEM) was employed to study single and multi-sheet arrangements of self-assembled CdSe quantum dots (QDs) in ZnSe and (Zn0.9Mn0.1)Se matrices. The negligible influence of strain field on Z-contrast images allow for an analysis of the shapes and sizes of a large number of QDs. Higher levels of self-ordering could be proven by such analyses in a sample for which a fractional monolayer of MnSe was deposited prior to the deposition of a single CdSe sheet, that subsequently self-assembled into three dimensional (3D) quantum dots. In the multi-sheet structure, we observed the co-existence of a variety of differently shaped, sized, and self-ordered Cd rich agglomerates. Several of these agglomerates showed different types of compositional modulation on the atomic scale. The advantages of using atomic resolution Z-contrast imaging in STEM for the elucidation of these modulations are demonstrated. Results of the standardless qualitative elemental mapping technique of Z-contrast STEM are in agreement with the results of semi-quantitative energy dispersive X-ray spectroscopy (EDS).

AB - Z-contrast imaging in the scanning transmission electron microscope (STEM) was employed to study single and multi-sheet arrangements of self-assembled CdSe quantum dots (QDs) in ZnSe and (Zn0.9Mn0.1)Se matrices. The negligible influence of strain field on Z-contrast images allow for an analysis of the shapes and sizes of a large number of QDs. Higher levels of self-ordering could be proven by such analyses in a sample for which a fractional monolayer of MnSe was deposited prior to the deposition of a single CdSe sheet, that subsequently self-assembled into three dimensional (3D) quantum dots. In the multi-sheet structure, we observed the co-existence of a variety of differently shaped, sized, and self-ordered Cd rich agglomerates. Several of these agglomerates showed different types of compositional modulation on the atomic scale. The advantages of using atomic resolution Z-contrast imaging in STEM for the elucidation of these modulations are demonstrated. Results of the standardless qualitative elemental mapping technique of Z-contrast STEM are in agreement with the results of semi-quantitative energy dispersive X-ray spectroscopy (EDS).

UR - http://www.scopus.com/inward/record.url?scp=0035559706&partnerID=8YFLogxK

M3 - Conference article

AN - SCOPUS:0035559706

SN - 0272-9172

VL - 642

SP - J8.3.1-J8.3.6

JO - Materials Research Society Symposium Proceedings

JF - Materials Research Society Symposium Proceedings

T2 - Semiconductor Quantum Dots II

Y2 - 27 November 2000 through 30 November 2000

ER -

Z-contrast scanning transmission electron microscopy on self-assembled CdSe quantum dots in ZnSe and (Zn,Mn)Se matrices

Abstract

ASJC Scopus subject areas

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