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Dissertation
Photo-electrical Properties of Transparent Conductive Materials in Hybrid Perovskite Solar Cells
Authors: --- --- --- ---
Year: 2020 Publisher: Liège Université de Liège (ULiège)

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Abstract

Since their emergence about ten years ago, perovskite solar cells show great promise. Indeed, they have achieved performances comparable to those of silicon cells and have good flexibility properties. However, their transparent conductive electrodes - transparent conductive oxides -, are not only composed of scarce elements but are also quite fragile. In the present work, silver nanowire networks will be suggested as a more viable alternative. For this purpose, the production process of perovskite solar cells will be analyzed step by step, allowing the identification of the stresses experienced by the cells. Similarly, silver nanowire networks will&#13;be produced and characterized in order to determine what stresses they can withstand. It will be found that in the case of replacement, two main factors can cause problems: the high production temperatures of the cells and the low adhesion of the nanowire networks. Various solutions will be proposed for successful replacement.


Dissertation
Travail de Fin d'Etudes : Optical and electrical properties of metallic nanostructures as electrode material for wide bandgap semiconducting junctions
Authors: --- --- --- --- --- et al.
Year: 2020 Publisher: Liège Université de Liège (ULiège)

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Optoelectronic components are made of active layers sandwiched between two electrodes. The challenge in developing transparent devices is to combine optical transparency and electrical conductivity, since highly transparent materials (glass, plastic) are insulating, while highly electrically conducting materials (silver, gold) are opaque. We fabricated a transparent&#13;electrode made of a silver nanowire network and relied on a wide band gap semiconductor (Cu2O and Cu2O:Mg) to make the p-type layer of a pn-junction. The goal was to test the compatibility between the silver nanowire network and the underlying cuprous oxide thin film. Les composants optoélectroniques sont constitués de couches actives prises en sandwich entre deux électrodes. Le défi du développement de dispositifs transparents consiste à combiner la transparence optique et la conductivité électrique, car les matériaux hautement transparents (verre, plastique) sont isolants, tandis que les matériaux très conducteurs d'électricité (argent, or) sont opaques. Nous avons fabriqué une électrode transparente constituée d'un réseau de nanofils d'argent déposée sur un semi-conducteur à large bande interdite (Cu2O et Cu2O:Mg) pour réaliser la couche de type p d'une jonction pn. L'objectif était de tester la compatibilité entre le réseau de nanofils d'argent et la couche mince d'oxyde cuivreux sous-jacente.


Book
Mesh-Free and Finite Element-Based Methods for Structural Mechanics Applications
Author:
Year: 2021 Publisher: Basel, Switzerland MDPI - Multidisciplinary Digital Publishing Institute

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Abstract

The problem of solving complex engineering problems has always been a major topic in all industrial fields, such as aerospace, civil and mechanical engineering. The use of numerical methods has increased exponentially in the last few years, due to modern computers in the field of structural mechanics. Moreover, a wide range of numerical methods have been presented in the literature for solving such problems. Structural mechanics problems are dealt with using partial differential systems of equations that might be solved by following the two main classes of methods: Domain-decomposition methods or the so-called finite element methods and mesh-free methods where no decomposition is carried out. Both methodologies discretize a partial differential system into a set of algebraic equations that can be easily solved by computer implementation. The aim of the present Special Issue is to present a collection of recent works on these themes and a comparison of the novel advancements of both worlds in structural mechanics applications.

Keywords

History of engineering & technology --- direction field --- tensor line --- principal stress --- tailored fiber placement --- heat conduction --- finite elements --- space-time --- elastodynamics --- mesh adaptation --- non-circular deep tunnel --- complex variables --- conformal mapping --- elasticity --- numerical simulation --- numerical modeling --- joint static strength --- finite element method --- parametric investigation --- reinforced joint (collar and doubler plate) --- nonlocal elasticity theory --- Galerkin weighted residual FEM --- silicon carbide nanowire --- silver nanowire --- gold nanowire --- biostructure --- rostrum --- paddlefish --- Polyodon spathula --- maximum-flow/minimum-cut --- stress patterns --- finite element modelling --- laminated composite plates --- non-uniform mechanical properties --- panel method --- marine propeller --- noise --- FW-H equations --- experimental test --- continuation methods --- bifurcations --- limit points --- cohesive elements --- functionally graded materials --- porosity distributions --- first-order shear deformation theory --- shear correction factor --- higher-order shear deformation theory --- equivalent single-layer approach --- direction field --- tensor line --- principal stress --- tailored fiber placement --- heat conduction --- finite elements --- space-time --- elastodynamics --- mesh adaptation --- non-circular deep tunnel --- complex variables --- conformal mapping --- elasticity --- numerical simulation --- numerical modeling --- joint static strength --- finite element method --- parametric investigation --- reinforced joint (collar and doubler plate) --- nonlocal elasticity theory --- Galerkin weighted residual FEM --- silicon carbide nanowire --- silver nanowire --- gold nanowire --- biostructure --- rostrum --- paddlefish --- Polyodon spathula --- maximum-flow/minimum-cut --- stress patterns --- finite element modelling --- laminated composite plates --- non-uniform mechanical properties --- panel method --- marine propeller --- noise --- FW-H equations --- experimental test --- continuation methods --- bifurcations --- limit points --- cohesive elements --- functionally graded materials --- porosity distributions --- first-order shear deformation theory --- shear correction factor --- higher-order shear deformation theory --- equivalent single-layer approach


Book
Mesh-Free and Finite Element-Based Methods for Structural Mechanics Applications
Author:
Year: 2021 Publisher: Basel, Switzerland MDPI - Multidisciplinary Digital Publishing Institute

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Abstract

The problem of solving complex engineering problems has always been a major topic in all industrial fields, such as aerospace, civil and mechanical engineering. The use of numerical methods has increased exponentially in the last few years, due to modern computers in the field of structural mechanics. Moreover, a wide range of numerical methods have been presented in the literature for solving such problems. Structural mechanics problems are dealt with using partial differential systems of equations that might be solved by following the two main classes of methods: Domain-decomposition methods or the so-called finite element methods and mesh-free methods where no decomposition is carried out. Both methodologies discretize a partial differential system into a set of algebraic equations that can be easily solved by computer implementation. The aim of the present Special Issue is to present a collection of recent works on these themes and a comparison of the novel advancements of both worlds in structural mechanics applications.


Book
Nanowire Field-Effect Transistor (FET)
Authors: --- ---
Year: 2021 Publisher: Basel, Switzerland MDPI - Multidisciplinary Digital Publishing Institute

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In the last few years, the leading semiconductor industries have introduced multi-gate non-planar transistors into their core business. These are being applied in memories and in logical integrated circuits to achieve better integration on the chip, increased performance, and reduced energy consumption. Intense research is underway to develop these devices further and to address their limitations, in order to continue transistor scaling while further improving performance. This Special Issue looks at recent developments in the field of nanowire field-effect transistors (NW-FETs), covering different aspects of the technology, physics, and modelling of these nanoscale devices.

Keywords

History of engineering & technology --- random dopant --- drift-diffusion --- variability --- device simulation --- nanodevice --- screening --- Coulomb interaction --- III-V --- TASE --- MOSFETs --- Integration --- nanowire field-effect transistors --- silicon nanomaterials --- charge transport --- one-dimensional multi-subband scattering models --- Kubo–Greenwood formalism --- schrödinger-poisson solvers --- DC and AC characteristic fluctuations --- gate-all-around --- nanowire --- work function fluctuation --- aspect ratio of channel cross-section --- timing fluctuation --- noise margin fluctuation --- power fluctuation --- CMOS circuit --- statistical device simulation --- variability effects --- Monte Carlo --- Schrödinger based quantum corrections --- quantum modeling --- nonequilibrium Green’s function --- nanowire transistor --- electron–phonon interaction --- phonon–phonon interaction --- self-consistent Born approximation --- lowest order approximation --- Padé approximants --- Richardson extrapolation --- ZnO --- field effect transistor --- conduction mechanism --- metal gate --- material properties --- fabrication --- modelling --- nanojunction --- constriction --- quantum electron transport --- quantum confinement --- dimensionality reduction --- stochastic Schrödinger equations --- geometric correlations --- silicon nanowires --- nano-transistors --- quantum transport --- hot electrons --- self-cooling --- nano-cooling --- thermoelectricity --- heat equation --- non-equilibrium Green functions --- power dissipation


Book
Mesh-Free and Finite Element-Based Methods for Structural Mechanics Applications
Author:
Year: 2021 Publisher: Basel, Switzerland MDPI - Multidisciplinary Digital Publishing Institute

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Abstract

The problem of solving complex engineering problems has always been a major topic in all industrial fields, such as aerospace, civil and mechanical engineering. The use of numerical methods has increased exponentially in the last few years, due to modern computers in the field of structural mechanics. Moreover, a wide range of numerical methods have been presented in the literature for solving such problems. Structural mechanics problems are dealt with using partial differential systems of equations that might be solved by following the two main classes of methods: Domain-decomposition methods or the so-called finite element methods and mesh-free methods where no decomposition is carried out. Both methodologies discretize a partial differential system into a set of algebraic equations that can be easily solved by computer implementation. The aim of the present Special Issue is to present a collection of recent works on these themes and a comparison of the novel advancements of both worlds in structural mechanics applications.


Book
Nanowire Field-Effect Transistor (FET)
Authors: --- ---
Year: 2021 Publisher: Basel, Switzerland MDPI - Multidisciplinary Digital Publishing Institute

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Abstract

In the last few years, the leading semiconductor industries have introduced multi-gate non-planar transistors into their core business. These are being applied in memories and in logical integrated circuits to achieve better integration on the chip, increased performance, and reduced energy consumption. Intense research is underway to develop these devices further and to address their limitations, in order to continue transistor scaling while further improving performance. This Special Issue looks at recent developments in the field of nanowire field-effect transistors (NW-FETs), covering different aspects of the technology, physics, and modelling of these nanoscale devices.

Keywords

random dopant --- drift-diffusion --- variability --- device simulation --- nanodevice --- screening --- Coulomb interaction --- III-V --- TASE --- MOSFETs --- Integration --- nanowire field-effect transistors --- silicon nanomaterials --- charge transport --- one-dimensional multi-subband scattering models --- Kubo–Greenwood formalism --- schrödinger-poisson solvers --- DC and AC characteristic fluctuations --- gate-all-around --- nanowire --- work function fluctuation --- aspect ratio of channel cross-section --- timing fluctuation --- noise margin fluctuation --- power fluctuation --- CMOS circuit --- statistical device simulation --- variability effects --- Monte Carlo --- Schrödinger based quantum corrections --- quantum modeling --- nonequilibrium Green’s function --- nanowire transistor --- electron–phonon interaction --- phonon–phonon interaction --- self-consistent Born approximation --- lowest order approximation --- Padé approximants --- Richardson extrapolation --- ZnO --- field effect transistor --- conduction mechanism --- metal gate --- material properties --- fabrication --- modelling --- nanojunction --- constriction --- quantum electron transport --- quantum confinement --- dimensionality reduction --- stochastic Schrödinger equations --- geometric correlations --- silicon nanowires --- nano-transistors --- quantum transport --- hot electrons --- self-cooling --- nano-cooling --- thermoelectricity --- heat equation --- non-equilibrium Green functions --- power dissipation


Book
Nanowire Field-Effect Transistor (FET)
Authors: --- ---
Year: 2021 Publisher: Basel, Switzerland MDPI - Multidisciplinary Digital Publishing Institute

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Abstract

In the last few years, the leading semiconductor industries have introduced multi-gate non-planar transistors into their core business. These are being applied in memories and in logical integrated circuits to achieve better integration on the chip, increased performance, and reduced energy consumption. Intense research is underway to develop these devices further and to address their limitations, in order to continue transistor scaling while further improving performance. This Special Issue looks at recent developments in the field of nanowire field-effect transistors (NW-FETs), covering different aspects of the technology, physics, and modelling of these nanoscale devices.

Keywords

History of engineering & technology --- random dopant --- drift-diffusion --- variability --- device simulation --- nanodevice --- screening --- Coulomb interaction --- III-V --- TASE --- MOSFETs --- Integration --- nanowire field-effect transistors --- silicon nanomaterials --- charge transport --- one-dimensional multi-subband scattering models --- Kubo–Greenwood formalism --- schrödinger-poisson solvers --- DC and AC characteristic fluctuations --- gate-all-around --- nanowire --- work function fluctuation --- aspect ratio of channel cross-section --- timing fluctuation --- noise margin fluctuation --- power fluctuation --- CMOS circuit --- statistical device simulation --- variability effects --- Monte Carlo --- Schrödinger based quantum corrections --- quantum modeling --- nonequilibrium Green’s function --- nanowire transistor --- electron–phonon interaction --- phonon–phonon interaction --- self-consistent Born approximation --- lowest order approximation --- Padé approximants --- Richardson extrapolation --- ZnO --- field effect transistor --- conduction mechanism --- metal gate --- material properties --- fabrication --- modelling --- nanojunction --- constriction --- quantum electron transport --- quantum confinement --- dimensionality reduction --- stochastic Schrödinger equations --- geometric correlations --- silicon nanowires --- nano-transistors --- quantum transport --- hot electrons --- self-cooling --- nano-cooling --- thermoelectricity --- heat equation --- non-equilibrium Green functions --- power dissipation --- random dopant --- drift-diffusion --- variability --- device simulation --- nanodevice --- screening --- Coulomb interaction --- III-V --- TASE --- MOSFETs --- Integration --- nanowire field-effect transistors --- silicon nanomaterials --- charge transport --- one-dimensional multi-subband scattering models --- Kubo–Greenwood formalism --- schrödinger-poisson solvers --- DC and AC characteristic fluctuations --- gate-all-around --- nanowire --- work function fluctuation --- aspect ratio of channel cross-section --- timing fluctuation --- noise margin fluctuation --- power fluctuation --- CMOS circuit --- statistical device simulation --- variability effects --- Monte Carlo --- Schrödinger based quantum corrections --- quantum modeling --- nonequilibrium Green’s function --- nanowire transistor --- electron–phonon interaction --- phonon–phonon interaction --- self-consistent Born approximation --- lowest order approximation --- Padé approximants --- Richardson extrapolation --- ZnO --- field effect transistor --- conduction mechanism --- metal gate --- material properties --- fabrication --- modelling --- nanojunction --- constriction --- quantum electron transport --- quantum confinement --- dimensionality reduction --- stochastic Schrödinger equations --- geometric correlations --- silicon nanowires --- nano-transistors --- quantum transport --- hot electrons --- self-cooling --- nano-cooling --- thermoelectricity --- heat equation --- non-equilibrium Green functions --- power dissipation


Book
Silica and Silicon Based Nanostructures
Author:
Year: 2022 Publisher: Basel : MDPI - Multidisciplinary Digital Publishing Institute,

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Silica and silicon-based nanostructures are now well-understood materials for which the technologies are mature. The most obvious applications, such as electronic devices, have been widely explored over the last two decades. The aim of this Special Issue is to bring together the state of the art in the field and to enable the emergence of new ideas and concepts for silicon and silica-based nanostructures.


Book
Novel Magnetic Properties in Curved Geometries
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Year: 2022 Publisher: Basel MDPI - Multidisciplinary Digital Publishing Institute

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This reprint focuses on fundamentals and applied research on magnetic structures with curved geometries. The influence of curvature in the magnetic structures is an appealing topic of research opening novel perspectives to engineer the magnetic textures and the magnetisation reversal processes. Special attention is given to the fabrication and optimisation of magnetic structures, their characterisation and possible use in technological applications.

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