Linking structural and electronic properties of high-purity self-assembled GaSb/GaAs quantum dots

T. Nowozin; A. Marent; L. Bonato; A. Schliwa; D. Bimberg; E.P. Smakman; J.K. Garleff; P.M. Koenraad; R.J. Young; M. Hayne

doi:10.1103/PhysRevB.86.035305

Linking structural and electronic properties of high-purity self-assembled GaSb/GaAs quantum dots

T. Nowozin, A. Marent, L. Bonato, A. Schliwa, D. Bimberg, E.P. Smakman, J.K. Garleff, P.M. Koenraad, R.J. Young, M. Hayne

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Abstract

We present structural, electrical, and theoretical investigations of self-assembled type-II GaSb/GaAs quantum dots (QDs) grown by molecular beam epitaxy. Using cross-sectional scanning tunneling microscopy (X-STM) the morphology of the QDs is determined. The QDs are of high purity (~100% GaSb content) and have most likely the shape of a truncated pyramid. The average heights of the QDs are 4–6 nm with average base lengths between 9 and 14 nm. Samples with a QD layer embedded into a pn-diode structure are studied with deep-level transient spectroscopy (DLTS), yielding a hole localization energy in the QDs of 609 meV. Based on the X-STM results the electronic structure of the QDs is calculated using 8-band k·p theory. The theoretical localization energies are found to be in good agreement with the DLTS results. Our results also allow us to estimate how variations in size and shape of the dots influence the hole localization energy.

Original language	English
Article number	035305
Pages (from-to)	035305-1/6
Number of pages	6
Journal	Physical Review B
Volume	86
Issue number	3
DOIs	https://doi.org/10.1103/PhysRevB.86.035305
Publication status	Published - 2012

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title = "Linking structural and electronic properties of high-purity self-assembled GaSb/GaAs quantum dots",

abstract = "We present structural, electrical, and theoretical investigations of self-assembled type-II GaSb/GaAs quantum dots (QDs) grown by molecular beam epitaxy. Using cross-sectional scanning tunneling microscopy (X-STM) the morphology of the QDs is determined. The QDs are of high purity (~100% GaSb content) and have most likely the shape of a truncated pyramid. The average heights of the QDs are 4–6 nm with average base lengths between 9 and 14 nm. Samples with a QD layer embedded into a pn-diode structure are studied with deep-level transient spectroscopy (DLTS), yielding a hole localization energy in the QDs of 609 meV. Based on the X-STM results the electronic structure of the QDs is calculated using 8-band k·p theory. The theoretical localization energies are found to be in good agreement with the DLTS results. Our results also allow us to estimate how variations in size and shape of the dots influence the hole localization energy.",

author = "T. Nowozin and A. Marent and L. Bonato and A. Schliwa and D. Bimberg and E.P. Smakman and J.K. Garleff and P.M. Koenraad and R.J. Young and M. Hayne",

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doi = "10.1103/PhysRevB.86.035305",

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T1 - Linking structural and electronic properties of high-purity self-assembled GaSb/GaAs quantum dots

AU - Nowozin, T.

AU - Marent, A.

AU - Bonato, L.

AU - Schliwa, A.

AU - Bimberg, D.

AU - Smakman, E.P.

AU - Garleff, J.K.

AU - Koenraad, P.M.

AU - Young, R.J.

AU - Hayne, M.

PY - 2012

Y1 - 2012

N2 - We present structural, electrical, and theoretical investigations of self-assembled type-II GaSb/GaAs quantum dots (QDs) grown by molecular beam epitaxy. Using cross-sectional scanning tunneling microscopy (X-STM) the morphology of the QDs is determined. The QDs are of high purity (~100% GaSb content) and have most likely the shape of a truncated pyramid. The average heights of the QDs are 4–6 nm with average base lengths between 9 and 14 nm. Samples with a QD layer embedded into a pn-diode structure are studied with deep-level transient spectroscopy (DLTS), yielding a hole localization energy in the QDs of 609 meV. Based on the X-STM results the electronic structure of the QDs is calculated using 8-band k·p theory. The theoretical localization energies are found to be in good agreement with the DLTS results. Our results also allow us to estimate how variations in size and shape of the dots influence the hole localization energy.

AB - We present structural, electrical, and theoretical investigations of self-assembled type-II GaSb/GaAs quantum dots (QDs) grown by molecular beam epitaxy. Using cross-sectional scanning tunneling microscopy (X-STM) the morphology of the QDs is determined. The QDs are of high purity (~100% GaSb content) and have most likely the shape of a truncated pyramid. The average heights of the QDs are 4–6 nm with average base lengths between 9 and 14 nm. Samples with a QD layer embedded into a pn-diode structure are studied with deep-level transient spectroscopy (DLTS), yielding a hole localization energy in the QDs of 609 meV. Based on the X-STM results the electronic structure of the QDs is calculated using 8-band k·p theory. The theoretical localization energies are found to be in good agreement with the DLTS results. Our results also allow us to estimate how variations in size and shape of the dots influence the hole localization energy.

U2 - 10.1103/PhysRevB.86.035305

DO - 10.1103/PhysRevB.86.035305

M3 - Article

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VL - 86

SP - 035305-1/6

JO - Physical Review B

JF - Physical Review B

IS - 3

M1 - 035305

ER -

Linking structural and electronic properties of high-purity self-assembled GaSb/GaAs quantum dots

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