Composition profiles of InAs–GaAs quantum dots determined by medium-energy ion scattering

Quinn, P.D.; Wilson, Neil R.; Hatfield, S. A.; McConville, Christopher F; Bell, GR; Noakes, T.C.Q.; Bailey, Paul; Al-Harthi, SH; Gard, F.S.

doi:10.1063/1.2099533

Cited by 22 publications

(17 citation statements)

References 18 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Several models of strain-induced QD formation have been proposed [2][3][4][5] but none of them takes the very important process of intermixing of the InAs deposit with substrate material into account. Growth parameter-dependent intermixing leads to a high content up to 90% of unintentional substrate material in the bottom layer of the QDs [6][7][8][9] which significantly modifies their strain status [10] and thus the process of QD formation. In this paper, we provide a model of QD formation that considers intermixing with substrate material.…”

Section: Introductionmentioning

confidence: 99%

Kinetic model of intermixing during self-assembled InAs quantum dot formation

Heyn¹,

Schramm²,

Kipp³

et al. 2007

Journal of Crystal Growth

View full text Add to dashboard Cite

Section: Introductionmentioning

confidence: 99%

Kinetic model of intermixing during self-assembled InAs quantum dot formation

Heyn¹,

Schramm²,

Kipp³

et al. 2007

Journal of Crystal Growth

View full text Add to dashboard Cite

“…7͒ and Au nanoparticles 8,9 and of InAs-GaAs quantum dots. 10 Basically the nanoparticles' shape, composition, size distribution, and stoichiometry have been successfully obtained. In addition, the determination of the number of nanosize inhomogeneities in thin films was also investigated for some particular geometrical shapes.…”

Section: Introductionmentioning

confidence: 99%

Characterization of nanoparticles through medium-energy ion scattering

Sortica

Grande

Machado

et al. 2009

Journal of Applied Physics

View full text Add to dashboard Cite

In this work we review the use of the medium-energy ion scattering ͑MEIS͒ technique to characterize nanostructures at the surface of a substrate. We discuss here how the determination of shape and size distribution of the nanoparticles is influenced by the energy loss at the backscattering collision, which leads to an asymmetrical energy-loss line shape. We show that the use of a Gaussian line shape may lead to important misinterpretations of a MEIS spectrum for nanoparticles smaller than 5 nm. The results are compared to measurements of gold nanoparticles adsorbed on a multilayered film of weak polyelectrolyte.

show abstract

“…Superimposed on the data are simulations calculated using an energy simulation code. This code is described in more detail elsewhere [19] but has been modified to incorporate an asymmetric lineshape (exponentially modified Gaussian) as this has been shown to be important when fitting energy spectra [20].…”

Section: Methodsmentioning

confidence: 99%

Stacking faults in ultra-thin films of silver on Al(111) investigated by medium energy ion scattering

et al. 2010

Self Cite

View full text Add to dashboard Cite

Medium energy ion scattering has been used to investigate depositions of 0.2, 1.4, 3.5 and 4.8 ML of silver onto Al(111). Energy profiles indicate alloying to the extent that aluminium is still visible after the deposition of 4.8 ML. From assessments of the visibility, blocking dips and fits using VEGAS simulations it is shown that the first two layers continue the fcc stacking but after that hcp and fcc twin-type stacking faults occur. The 1.4 ML structure is consistent with a mixed structure of 85% fcc and 15% hcp indicating that some silver occupies a third layer. The blocking curve from the structure formed by 3.5 ML equivalent deposition can be simulated by 56% fcc, 32% hcp and 12% fcc twin and that from 4.8 ML by 59% fcc, 23% hcp and 18% fcc twin. This provides direct evidence of the incidence of hcp stacking when silver is deposited onto Al(111) in the range between 2 and 5 ML.

show abstract

Composition profiles of InAs–GaAs quantum dots determined by medium-energy ion scattering

Cited by 22 publications

References 18 publications

Kinetic model of intermixing during self-assembled InAs quantum dot formation

Kinetic model of intermixing during self-assembled InAs quantum dot formation

Characterization of nanoparticles through medium-energy ion scattering

Stacking faults in ultra-thin films of silver on Al(111) investigated by medium energy ion scattering

Contact Info

Product

Resources

About