Grazing-incidence small-angle X-ray scattering: application to the study of quantum dot lattices

Buljan, Maja; Radić, Nikola; Bernstorff, Sigrid; Dražić, Goran; Bogdanović-Radović, Ivančica; Holý, V.

doi:10.1107/s0108767311040104

Cited by 62 publications

(107 citation statements)

References 47 publications

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“…[18]. Because we are interested only in QD information, the mentioned range with the small Q y values is not important for this study.…”

Section: Structural Propertiesmentioning

confidence: 99%

“…A clearly different image for the core/shell and only core QDs of the same size is shown, thus giving us the powerful tool of showing that a core/shell structure is obtained. Insets show simulations obtained using the model that was explained in detail elsewhere [18].…”

Section: Structural Propertiesmentioning

confidence: 99%

“…To get the structural parameters, GISAXS maps were numerically analyzed using the model described in Ref. [18]. For the analysis, it was assumed that QDs are arranged in a 3D paracrystal body centered tetragonal (BCT) lattice and that they have a core/ shell internal structure, with the center of the core shifted from the shell center (see Figures 1 and 3).…”

Section: Structural Propertiesmentioning

confidence: 99%

“…A more detailed structural analysis of the films was performed using the grazing incidence small-angle X-ray scattering (GISAXS) method, as it was shown to be very sensitive to the internal structure of core/shell QDs as well as to their arrangement properties [17,18].…”

Section: Structural Propertiesmentioning

confidence: 99%

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Ge/Si core/shell quantum dots in alumina: tuning the optical absorption by the core and shell size

et al. 2017

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Ge/Si core/shell quantum dots (QDs) recently received extensive attention due to their specific properties induced by the confinement effects of the core and shell structure. They have a type II confinement resulting in spatially separated charge carriers, the electronic structure strongly dependent on the core and shell size. Herein, the experimental realization of Ge/Si core/shell QDs with strongly tunable optical properties is demonstrated. QDs embedded in an amorphous alumina glass matrix are produced by simple magnetron sputtering deposition. In addition, they are regularly arranged within the matrix due to their self-assembled growth regime. QDs with different Ge core and Si shell sizes are made. These core/shell structures have a significantly stronger absorption compared to pure Ge QDs and a highly tunable absorption peak dependent on the size of the core and shell. The optical properties are in agreement with recent theoretical predictions showing the dramatic influence of the shell size on optical gap, resulting in 0.7 eV blue shift for only 0.4 nm decrease at the shell thickness. Therefore, these materials are very promising for light-harvesting applications.

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“…[18]. Because we are interested only in QD information, the mentioned range with the small Q y values is not important for this study.…”

Section: Structural Propertiesmentioning

confidence: 99%

Section: Structural Propertiesmentioning

confidence: 99%

Section: Structural Propertiesmentioning

confidence: 99%

Section: Structural Propertiesmentioning

confidence: 99%

See 2 more Smart Citations

Ge/Si core/shell quantum dots in alumina: tuning the optical absorption by the core and shell size

et al. 2017

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“…For this study, a new program has been implemented for simulating and fitting GISAXS data collected from compact 3D assemblies. The program is based on a model previously published by Buljan, et al, 64 describing diluted assemblies where the sizes and positions of the quantum dots could be assumed to be statistically uncorrelated. That model was then improved and applied to the GISAXS study of a 3D ordered non-diluted assembly of colloidal iron oxide NCs.…”

Section: Gisaxs -3d Self-assembly Of Iron Oxide Ncs 59mentioning

confidence: 99%

Assembled Nanostructured Architectures Studied by Grazing Incidence X-Ray Scattering

Altamura

Sibillano

Siliqi

et al. 2012

Nanomaterials and Nanotechnology

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In this chapter, we will focus on a specific X-raybased technique among those employed in surface science and which is especially suitable for the study of self-assembled nanocrystals: Grazing Incidence Small Angle X-ray Scattering (GISAXS). We will first introduce the main field of investigation considered herein, with basic notions of X-ray scattering from surfaces, and then address basic concepts about GISAXS. Finally, we will describe a few relevant examples of studies, of nanostructured architectures, through ex situ and in situ experiments of grazing incidence X-ray scattering. This manuscript is focused on the former, showing that they can be performed by using laboratory instruments. In situ investigations still need synchrotron radiation sources in most cases; therefore, only a few examples selected from the literature are reported here, for the sake of completeness. The experiments described are mainly performed in the small angle range, providing information on the size and shape of nanocrystals, together with their spatial arrangement. Both 2D and 3D architectures are considered. In particular, GISAXS measurements of 2D superlattices of nano-octapods, performed both at a third generation synchrotron beamline and with a table-top set-up, are compared; the employed table-top set-up is described in a dedicated paragraph. Further examples of grazing incidence studies as performed by the authors with a table-top set-up are reported: a GISAXS study of 3D iron oxide nanocrystal superlattices, showing the importance of modelling in order to obtain structural information from data; a combined small/wide angle scattering (GISAXS/GIWAXS) study of 3D PbS nanocrystal superlattices; and a GIWAXS study of P3HT nanofibres, showing how the ordering at the molecular and atomic length scales can be obtained by exploring different angular ranges in the same grazing incidence geometry. Finally, selected examples of in situ GISAXS studies, performed with synchrotron radiation sources, are described.

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Influence of annealing conditions on the structural and photoluminescence properties of Ge quantum dot lattices in a continuous Ge + Al₂ O₃ film

Buljan

Radić

Bogdanović-Radović

et al. 2013

Phys. Status Solidi A

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We investigate the structural and photoluminescence (PL) properties of regularly ordered lattices of Ge quantum dots (QDs) formed by self-assembly in a thick film of Ge þ Al 2 O 3 mixture. The effects of annealing at different temperatures and different annealing environments (vacuum and air) are studied. We show that the regular ordering of QDs remains unchanged for annealing up to 800 8C in vacuum, while it is preserved up to 700 8C when annealing is performed in air. The inner/ crystalline structure of Ge QDs and their shape depend on the annealing conditions. The crystalline grains of g-Al 2 O 3 form in the initially amorphous Al 2 O 3 matrix after annealing at 800 8C. The PL spectra are found to consist of two main contributions, one from the matrix and the other from Ge QDs. Both contributions depend strongly on the annealing conditions. The annealing treatment of Ge quantum dot lattices formed by self-assembly in alumina matrix influence significantly the internal structure and photoluminescence properties of the films.

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Grazing-incidence small-angle X-ray scattering: application to the study of quantum dot lattices

Cited by 62 publications

References 47 publications

Ge/Si core/shell quantum dots in alumina: tuning the optical absorption by the core and shell size

Ge/Si core/shell quantum dots in alumina: tuning the optical absorption by the core and shell size

Assembled Nanostructured Architectures Studied by Grazing Incidence X-Ray Scattering

Influence of annealing conditions on the structural and photoluminescence properties of Ge quantum dot lattices in a continuous Ge + Al₂ O₃ film

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Grazing-incidence small-angle X-ray scattering: application to the study of quantum dot lattices

Cited by 62 publications

References 47 publications

Ge/Si core/shell quantum dots in alumina: tuning the optical absorption by the core and shell size

Ge/Si core/shell quantum dots in alumina: tuning the optical absorption by the core and shell size

Assembled Nanostructured Architectures Studied by Grazing Incidence X-Ray Scattering

Influence of annealing conditions on the structural and photoluminescence properties of Ge quantum dot lattices in a continuous Ge + Al2 O3 film

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Product

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Influence of annealing conditions on the structural and photoluminescence properties of Ge quantum dot lattices in a continuous Ge + Al₂ O₃ film