Shape transition in InAs nanostructures formed by Stranski-Krastanow growth mode on InP (001) substrate

Ponchet, Anne; Pédesseau, Laurent; Corre, Alain Le; Cornet, Charles; Bertru, Nicolas

doi:10.1063/1.5091058

Cited by 9 publications

(8 citation statements)

References 23 publications

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“…In addition, the height of QNS is also limited, as the InSb adatoms do not have enough energy to migrate to the top of the QNSs due to the usage of low growth temperature. Observations of elongated nanostructures similar to InSb QNSs obtained in this work in other material systems have also been reported …”

Section: Resultssupporting

confidence: 83%

“…The crystallographic planes of InSb that align parallel to [110] and

[1 \bar{1} 0]

directions possess different atomic arrangements. The facets along [110] and

[1 \bar{1} 0]

directions then have nonequivalent surface energies . This surface energy anisotropy is considered to determine the QNS equilibrium shape, in which, in this case, the facet of InSb QNS along [110] direction is postulated to have a lower surface energy than that of the facet along

[1 \bar{1} 0]

direction.…”

Section: Resultsmentioning

confidence: 99%

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Investigation of the Morphology of InSb/InAs Quantum Nanostripe Grown by Molecular Beam Epitaxy

Rongrueangkul

Srisinsuphya

Thainoi

et al. 2019

Physica Status Solidi (b)

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The dimensions and morphologies of quantum nanostructures are keys to controlling an operating wavelength to a desirable wavelength range due to the quantum effect. The dimension and morphology evolutions of InSb/InAs quantum nanostructures grown by molecular beam epitaxy with respect to the number of InSb monolayers (MLs) are investigated. The formation of the quantum nanostructures is dominated by lateral growth, in which the morphology is further elongated as the number of MLs is increased. Such an anisotropic growth is explained by the difference in the surface energy along each direction, which corresponds to different atomic arrangements in the crystalline structure of InSb. Cross‐sectional transmission electron microscopic images show a reduction in the lateral dimension and an increase in the height of the embedded InSb quantum nanostructures when they are embedded in the InAs matrix. The results herein provide a means for obtaining the precise control over dimensions and morphologies of the InSb/InAs nanostructures, which is essential for extending the operating wavelength further into the mid‐infrared region.

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Section: Resultssupporting

confidence: 83%

“…The crystallographic planes of InSb that align parallel to [110] and

[1 \bar{1} 0]

directions possess different atomic arrangements. The facets along [110] and

[1 \bar{1} 0]

[1 \bar{1} 0]

direction.…”

Section: Resultsmentioning

confidence: 99%

Investigation of the Morphology of InSb/InAs Quantum Nanostripe Grown by Molecular Beam Epitaxy

Rongrueangkul

Srisinsuphya

Thainoi

et al. 2019

Physica Status Solidi (b)

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“…In this article, we aim at uncovering the mechanisms responsible for this important morphological evolution. As for some other nanostructures [8], the continuous approach adopted here provides a theoretical frame to explore the energy landscape as a function of the core and shell morphologies for NPs of any size, particularly in the typical experimental range (from 1 to 50 nm [7,[9][10][11]), and as such is a complementary approach to atomistic simulations.…”

Section: Introductionmentioning

confidence: 99%

Equilibrium shape of core(Fe)–shell(Au) nanoparticles as a function of the metals volume ratio

Ponchet

Combettes

Benzo

et al. 2020

Journal of Applied Physics

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The equilibrium shape of nanoparticles is investigated to elucidate the various core-shell morphologies observed in a bimetallic system associating two immiscible metals, iron and gold, that crystallize respectively in the bcc and fcc lattices. Fe-Au core-shell nanoparticles present a crystalline Fe core embedded in a polycrystalline Au shell, with core and shell morphologies both depending on the Au/Fe volume ratio. A model is proposed to calculate the energy of these nanoparticles as a function of the Fe volume, Au/Fe volume ratio, core shape and shell shape, using the DFT-computed energy densities of the metal surfaces and of the two possible Au/Fe interfaces. Three driving forces leading to equilibrium shapes were identified: the strong adhesion of Au on Fe, the minimization of the Au/Fe interface energy that promotes one of the two possible interface types, and the Au surface energy minimization that promotes a 2D-3D Stranski-Krastanov like transition of the shell. For low Au/Fe volume ratio, the wetting is the dominant driving force and leads to the same polyhedral shape for the core and the shell, with an octagonal section. For large Au/Fe ratio, the surface and interface energy minimizations can act independently to form an almost cube-shaped Fe core surrounded by six Au pyramids. The experimental nanoparticles shapes are well reproduced by the model, for both low and large Au/ Fe volume ratios.

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“…Previously, we have also shown that small and large Qdashes have roughly the same aspect ratios [ 16 ]. This aspect ratio conservation points to the stability and energetic favorability of the {114} facet [ 30 ]. In InAs QDs on GaAs, the stable facet is {136}, which would appear as ~ 29° chevron tails on RHEED images [ 29 ].…”

Section: Resultsmentioning

confidence: 99%

Punctuated growth of InAs quantum dashes-in-a-well for enhanced 2-μm emission

et al. 2023

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InAs quantum dashes (Qdash) engineered to emit near 2 μm are envisioned to be promising quantum emitters for next-generation technologies in sensing and communications. In this study, we explore the effect of punctuated growth (PG) on the structure and optical properties of InP-based InAs Qdashes emitting near the 2-μm wavelength. Morphological analysis revealed that PG led to an improvement in in-plane size uniformity and increases in average height and height distribution. A 2 × boost in photoluminescence intensity was observed, which we attribute to improved lateral dimensions and structural stabilization. PG encouraged formation of taller Qdashes while photoluminescence measurements revealed a blue-shift in the peak wavelength. We proposed that the blue-shift originates from the thinner quantum well cap and decreased distance between the Qdash and InAlGaAs barrier. This study on the punctuated growth of large InAs Qdashes is a step toward realizing bright, tunable, and broadband sources for 2-μm communications, spectroscopy, and sensing.

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Shape transition in InAs nanostructures formed by Stranski-Krastanow growth mode on InP (001) substrate

Cited by 9 publications

References 23 publications

Investigation of the Morphology of InSb/InAs Quantum Nanostripe Grown by Molecular Beam Epitaxy

Investigation of the Morphology of InSb/InAs Quantum Nanostripe Grown by Molecular Beam Epitaxy

Equilibrium shape of core(Fe)–shell(Au) nanoparticles as a function of the metals volume ratio

Punctuated growth of InAs quantum dashes-in-a-well for enhanced 2-μm emission

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