Preparation of non-oxidized Ge quantum dot lattices in amorphous Al2O3, Si3N4 and SiC matrices

Nekić, Nikolina; Šarić, Iva; Salamon, Krešimir; Basioli, Lovro; Sancho‐Parramon, Jordi; Grenzer, J.; Hübner, René; Bernstorff, Sigrid; Petravić, M.; Mičetić, Maja

doi:10.1088/1361-6528/ab1d3c

Cited by 15 publications

(32 citation statements)

References 31 publications

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“…The ordering type of QDs for this case is body-centered tetragonal (BCT), which can be concluded from the arrangement and shape of spots and also from the literature data about similar samples [10][11][12].…”

Section: D Ge Quantum Dot Latticesmentioning

confidence: 58%

“…The method is especially efficient for the analysis of systems that have some regularity in the NO ordering. Due to the regularity, distinctive Bragg peaks appear in GISAXS maps, because GISAXS reflects the structural properties in the reciprocal space [1][2][3][4][5][6][7][8][9][10][11][12]. Thus, a visual inspection of a GISAXS map is usually enough to roughly determine the type of the NO arrangement and the separations between the NOs.…”

Section: Introductionmentioning

confidence: 99%

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Application of GISAXS in the Investigation of Three-Dimensional Lattices of Nanostructures

et al. 2019

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The application of the grazing-incidence small-angle X-ray scattering (GISAXS) technique for the investigation of three-dimensional lattices of nanostructures is demonstrated. A successful analysis of three-dimensionally ordered nanostructures requires applying a suitable model for the description of the nanostructure ordering. Otherwise, it is possible to get a good agreement between the experimental and the simulated data, but the parameters obtained by fitting may be completely incorrect. In this paper, we theoretically examine systems having different types of nanostructure ordering, and we show how the choice of the correct model for the description of ordering influences the analysis results. Several theoretical models are compared in order to show how to use GISAXS in the investigation of self-assembled arrays of nanoparticles, and also in arrays of nanostructures obtained by ion-beam treatment of thin films or surfaces. All models are supported by experimental data, and the possibilities and limitations of GISAXS for the determination of material structure are discussed.

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Section: D Ge Quantum Dot Latticesmentioning

confidence: 58%

Section: Introductionmentioning

confidence: 99%

Application of GISAXS in the Investigation of Three-Dimensional Lattices of Nanostructures

et al. 2019

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“…We have assumed that the QDs are arranged in the BCT lattice, with the parameters a and c described above, in accordance with the arrangement of pure Ge QDs or Ge-core Si-shell QDs in alumina, produced by the same method. 4,5,19,23,24 The QDs are assumed to have a core− shell structure, with the radius of the core R c and the total radius R s . The center of the core is shifted from the center of the shell by the vector d. Details about the definition of these parameters can be found in ref 24.…”

Section: Structural Propertiesmentioning

confidence: 99%

“…The dependence of these optical constants with the photon energy was modeled using a flexible multiple Gaussian oscillator model 46 that has been shown to provide a good description of the optical properties of this kind of composites. 5,23 The optimal value of the parameters describing the oscillator model and the total multilayer thickness was numerically determined by fitting the measured ellipsometric spectra using the V-VASE software. The results, as well as the simulations explained below, are shown in Figure 6.…”

Section: Structural Propertiesmentioning

confidence: 99%

Ge Quantum Dots Coated with Metal Shells (Al, Ta, and Ti) Embedded in Alumina Thin Films for Solar Energy Conversion

Basioli

Sancho‐Parramon

Despoja

et al. 2020

ACS Appl. Nano Mater.

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A method to enhance the optoelectronic properties of thin films containing three-dimensional ordered germanium quantum dots (QDs) coated with metal shell (Al, Ta, and Ti) in alumina matrix is presented. The conditions for the achievement of self-assembled growth of the metal-coated Ge QDs by magnetron sputtering deposition are explored. The influence of the metal shell on the structural, optical, and optoelectronic properties is found to be radical and desirable. First, it reduces Ge oxidation. Second, it enhances overall absorption by an order of magnitude. Third, it enables manipulation of the absorption curve shape in two ways. The Ge absorption peak, useful for photoelectric conversion, can be tuned significantly via control of the Ge energy gap because of the quantum confinement effect. On the other hand, infrared absorption can be controlled by the amount of metal because the geometry of the system can enhance absorption in the core by excitation of plasmon resonances in the shell. The mentioned effects result in a high increase of the photocurrent and quantum efficiency of core−shell nanoparticles compared to simple Ge particles. The experiments are supported by theoretical predictions, showing that the intensity of the incident radiation is strongly amplified in the region around the metal−semiconductor interface upon the excitation of plasmon resonances, hence increasing the probability of photon absorption and, thus, of charge carrier generation in the photo-active material. Therefore, the presented materials are very promising for photoelectric devices.

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“…An important part of the development and research of new functional materials is related to the methods of preparation and conditioning of nanostructures in matrices [21,22]. The creation of spatially ordered nanoparticle (NP) lattices in the matrix material is not a necessary consequence of the magnetron deposition.…”

Section: Introductionmentioning

confidence: 99%

Structural, Optical and Electrical Properties of Al+MoO3 and Au+MoO3 Thin Films Prepared by Magnetron Codeposition

et al. 2021

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Structural, optical and electrical properties of Al+MoO3 and Au+MoO3 thin films prepared by simultaneous magnetron sputtering deposition were investigated. The influence of MoO3 sputtering power on the Al and Au nanoparticle formation and spatial distribution was explored. We demonstrated the formation of spatially arranged Au nanoparticles in the MoO3 matrix, while Al incorporates in the MoO3 matrix without nanoparticle formation. The dependence of the Au nanoparticle size and arrangement on the MoO3 sputtering power was established. The Al-based films show a decrease of overall absorption with an Al content increase, while the Au-based films have the opposite trend. The transport properties of the investigated films also are completely different. The resistivity of the Al-based films increases with the Al content, while it decreases with the Au content increase. The reason is a different transport mechanism that occurs in the films due to their different structural properties. The choice of the incorporated material (Al or Au) and its volume percentage in the MoO3 matrix enables the design of materials with desirable optical and electrical characteristics for a variety of applications.

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Preparation of non-oxidized Ge quantum dot lattices in amorphous Al₂O₃, Si₃N₄ and SiC matrices

Cited by 15 publications

References 31 publications

Application of GISAXS in the Investigation of Three-Dimensional Lattices of Nanostructures

Application of GISAXS in the Investigation of Three-Dimensional Lattices of Nanostructures

Ge Quantum Dots Coated with Metal Shells (Al, Ta, and Ti) Embedded in Alumina Thin Films for Solar Energy Conversion

Structural, Optical and Electrical Properties of Al+MoO3 and Au+MoO3 Thin Films Prepared by Magnetron Codeposition

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