“Synthesis of high-oxidation Y-Ba-Cu-O phases in superoxygenated thin films”. Zhang H, Gauquelin N, McMahon C, Hawthorn DG, Botton GA, Wei JYT, Physical review materials 2, 033803 (2018). http://doi.org/10.1103/PHYSREVMATERIALS.2.033803
Abstract: It is known that solid-state reaction in high-pressure oxygen can stabilize high-oxidation phases of Y-Ba-Cu-O superconductors in powder form. We extend this superoxygenation concept of synthesis to thin films which, due to their large surface-to-volume ratio, are more reactive thermodynamically. Epitaxial thin films of YBa2Cu3O7-delta grown by pulsed laser deposition are annealed at up to 700 atm O-2 and 900 degrees C, in conjunction with Cu enrichment by solid-state diffusion. The films show the clear formation of Y2Ba4Cu7O15-delta and Y2Ba4Cu8O16 as well as regions of YBa2Cu5O9-delta and YBa2Cu6O10-delta phases, according to scanning transmission electron microscopy, x-ray diffraction, and x-ray absorption spectroscopy. Similarly annealed YBa2Cu3O7-delta powders show no phase conversion. Our results demonstrate a route of synthesis towards discovering more complex phases of cuprates and other superconducting oxides.
Keywords: A1 Journal article; Electron microscopy for materials research (EMAT)
Times cited: 2
DOI: 10.1103/PHYSREVMATERIALS.2.033803
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“Strong-coupling limit for one-dimensional polarons in a finite box”. Vansant P, Smondyrev MA, Peeters FM, Devreese JT, Zeitschrift für Physik: B: condensed matter and quanta 99, 345 (1996). http://doi.org/10.1007/s002570050047
Keywords: A1 Journal article; Condensed Matter Theory (CMT); Theory of quantum systems and complex systems
Times cited: 1
DOI: 10.1007/s002570050047
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Berthelot A (2018) Modeling of microwave plasmas for carbon dioxide conversion. University of Antwerp, Antwerp
Keywords: Doctoral thesis; Plasma Lab for Applications in Sustainability and Medicine – Antwerp (PLASMANT)
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“Probing the intrinsic limitations of the contact resistance of metal/semiconductor interfaces through atomistic simulations”. Pourtois G, Dabral A, Sankaran K, Magnus W, Yu H, de de Meux AJ, Lu AKA, Clima S, Stokbro K, Schaekers M, Houssa M, Collaert N, Horiguchi N, Semiconductors, Dielectrics, And Metals For Nanoelectronics 15: In Memory Of Samares Kar , 303 (2017). http://doi.org/10.1149/08001.0303ECST
Abstract: In this contribution, we report a fundamental study of the factors that set the contact resistivity between metals and highly doped semiconductors. We investigate the case of n-type doped Si contacted with amorphous TiSi combining first-principles calculations with Non-Equilibrium Green functions transport simulations. The intrinsic contact resistivity is found to saturate at similar to 2x10(-10) Omega.cm(2) with the doping concentration and sets an intrinsic limit to the ultimate contact resistance achievable for n-doped Si vertical bar amorphous-TiSi. This limit arises from the intrinsic properties of the semiconductor and of the metal such as their electron effective masses and Fermi energies. We illustrate that, in this regime, contacting metals with a heavy electron effective mass helps reducing the interface intrinsic contact resistivity.
Keywords: P1 Proceeding; Engineering sciences. Technology; Condensed Matter Theory (CMT); Plasma Lab for Applications in Sustainability and Medicine – Antwerp (PLASMANT)
Times cited: 1
DOI: 10.1149/08001.0303ECST
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“Epitaxial CVD growth of ultra-thin Si passivation layers on strained Ge fin structures”. Loo R, Arimura H, Cott D, Witters L, Pourtois G, Schulze A, Douhard B, Vanherle W, Eneman G, Richard O, Favia P, Mitard J, Mocuta D, Langer R, Collaert N, Semiconductor Process Integration 10 , 241 (2017). http://doi.org/10.1149/08004.0241ECST
Abstract: Epitaxially grown ultra-thin Si layers are often used to passivate Ge surfaces in the high-k gate module of (strained) Ge FinFET devices. We use Si4H10 as Si precursor as it enables epitaxial Si growth at temperatures down to 330 degrees C. C-V characteristics of blanket capacitors made on Ge virtual substrates point to the presence of an optimal Si thickness. In case of compressively strained Ge fin structures, the Si growth results in non-uniform and high strain levels in the strained Ge fin. These strain levels have been calculated for different shapes of the Ge fin and in function of the grown Si thickness. The high strain is the driving force for potential (unwanted) Ge surface reflow during the Si deposition. The Ge surface reflow is strongly affected by the strength of the H-passivation during Si-capping and can be avoided by carefully selected process conditions.
Keywords: P1 Proceeding; Plasma Lab for Applications in Sustainability and Medicine – Antwerp (PLASMANT)
DOI: 10.1149/08004.0241ECST
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“Self-consistent 30-band simulation approach for (non-)uniformly strained confined heterostructure tunnel field-effect transistors”. Verreck D, Verhulst AS, Van de Put ML, Sorée B, Magnus W, Collaert N, Mocuta A, Groeseneken G, Simulation of Semiconductor Processes and, Devices (SISPAD)AND DEVICES (SISPAD 2017) , 29 (2017)
Abstract: Heterostructures of III-V materials under a mechanical strain are being actively researched to enhance the performance of the tunnel field-effect transistor (TFET). In scaled III-V device structures, however, the interplay between the effects of strain and quantum confinement on the semiconductor band structure and hence the performance is highly non-trivial. We have therefore developed a computationally efficient quantum mechanical simulator Pharos, which enables self-consistent full-zone k.p-based simulations of III-V TFETs under a general non-uniform strain. We present the self-consistent procedure and demonstrate it on confined staggered bandgap GaAs0.5Sb0.5/In0.53Ga0.47As TFETs. We find a large performance degradation due to size-induced quantum confinement compared to non-confined devices. We show that some performance can be regained either by applying a uniform biaxial tensile strain or through the non-uniform strain profile at a lattice-mismatched heterostructure.
Keywords: P1 Proceeding; Condensed Matter Theory (CMT)
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“Resistivity scaling model for metals with conduction band anisotropy”. De Clercq M, Moors K, Sankaran K, Pourtois G, Dutta S, Adelmann C, Magnus W, Sorée B, Physical review materials 2, 033801 (2018). http://doi.org/10.1103/PHYSREVMATERIALS.2.033801
Abstract: It is generally understood that the resistivity of metal thin films scales with film thickness mainly due to grain boundary and boundary surface scattering. Recently, several experiments and ab initio simulations have demonstrated the impact of crystal orientation on resistivity scaling. The crystal orientation cannot be captured by the commonly used resistivity scaling models and a qualitative understanding of its impact is currently lacking. In this work, we derive a resistivity scaling model that captures grain boundary and boundary surface scattering as well as the anisotropy of the band structure. The model is applied to Cu and Ru thin films, whose conduction bands are (quasi-) isotropic and anisotropic, respectively. After calibrating the anisotropy with ab initio simulations, the resistivity scaling models are compared to experimental resistivity data and a renormalization of the fitted grain boundary reflection coefficient can be identified for textured Ru.
Keywords: A1 Journal article; Condensed Matter Theory (CMT)
DOI: 10.1103/PHYSREVMATERIALS.2.033801
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Sun S (2018) Study of carbon dioxide dissociation mechanisms in a gliding arc discharge. Beihang University, School of Astronautics, Beijing
Keywords: Doctoral thesis; Plasma Lab for Applications in Sustainability and Medicine – Antwerp (PLASMANT)
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Ş,entosun K (2018) 2D and 3D characterization of plasmonic and porous nanoparticles using transmission electron microscopy. Antwerp
Keywords: Doctoral thesis; Electron microscopy for materials research (EMAT)
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Jelić, Ž, (2018) Emergent vortex phenomena in spatially and temporally modulated superconducting condensates. Liège
Keywords: Doctoral thesis; Engineering sciences. Technology; Condensed Matter Theory (CMT)
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“DIY measurement of your personal HRTF at home : low-cost, fast and validated”. Reijniers J, Partoens B, Peremans H, , 1 (2017)
Abstract: <script type='text/javascript'>document.write(unpmarked('The breakthrough of 3D audio has been hampered by the lack of personalized head-related transfer functions (HRTF) required to create realistic 3D audio environments using headphones. In this paper we present a new method for the user to personalize his/her HRTF, similar to the measurement in an anechoic room, yet it is low-cost and can be carried out at home. We compare the resulting HRTFs with those measured in an anechoic room. Subjecting the participants to a virtual localization experiment, we show that they perform significantly better when using their personalized HRTF, compared to a generic HRTF. We believe this method has the potential of opening the way for large scale commercial use of 3D audio through headphones.'));
Keywords: P3 Proceeding; Engineering sciences. Technology; Engineering Management (ENM); Condensed Matter Theory (CMT)
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van den Bos KHW (2017) Quantitative atomic resolution transmission electron microscopy for heterogeneous nanomaterials. Antwerpen
Keywords: Doctoral thesis; Electron microscopy for materials research (EMAT)
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Aierken Y (2017) First-principles studies of novel two-dimensional materials and their physical properties. Antwerpen
Keywords: Doctoral thesis; Condensed Matter Theory (CMT)
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Mirzakhani M (2017) Electronic properties and energy levels of graphene quantum dots. Antwerpen
Keywords: Doctoral thesis; Condensed Matter Theory (CMT)
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Zanaga D (2017) Advanced algorithms for quantitative electron tomography. Antwerpen
Keywords: Doctoral thesis; Electron microscopy for materials research (EMAT)
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Bladt E (2017) Two- and three-dimensional transmission electron microscopy of colloidal nanoparticles : from struture to composition. Antwerpen
Keywords: Doctoral thesis; Electron microscopy for materials research (EMAT)
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Dabaghmanesh S (2017) Atomistic modeling of the structural and electronic properties of Cr-based oxides and their potential application as TCO materials. Antwerpen
Keywords: Doctoral thesis; Plasma Lab for Applications in Sustainability and Medicine – Antwerp (PLASMANT)
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Garcí,a Sá,nchez C (2017) Quantifying inflow uncertainties for CFD simulations of dispersion in the atmospheric boundary layer. Antwerpen
Keywords: Doctoral thesis; Electron microscopy for materials research (EMAT)
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“Investigating lattice strain in Au nanodecahedrons”. Goris B, De Beenhouwer J, de Backer A, Zanaga D, Batenburg J, Sanchez-Iglesias A, Liz-Marzan L, Van Aert S, Sijbers J, Van Tendeloo G, Bals S, , 11 (2016). http://doi.org/10.1002/9783527808465.EMC2016.5519
Keywords: P1 Proceeding; Electron microscopy for materials research (EMAT); Vision lab
DOI: 10.1002/9783527808465.EMC2016.5519
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“Perspective of tunnel-FET for future low-power technology nodes”. Verhulst AS, Verreck D, Smets Q, Kao K-H, Van de Put M, Rooyackers R, Sorée B, Vandooren A, De Meyer K, Groeseneken G, Heyns MM, Mocuta A, Collaert N, Thean AV-Y, 2014 Ieee International Electron Devices Meeting (iedm) (2014)
Keywords: P1 Proceeding; Condensed Matter Theory (CMT)
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“Luminescence of fixed site Ag nanoclusters in a simple oxyfluoride glass host and plasmon absorption of amorphous Ag nanoparticles in a complex oxyfluoride glass host”. Shestakov MV, Meledina M, Turner S, Baekelant W, Verellen N, Chen X, Hofkens J, Van Tendeloo G, Moshchalkov VV, Proceedings of the Society of Photo-optical Instrumentation Engineers
T2 –, 8th International Conference on Photonics, Devices, and System VI, AUG 27-29, 2014, Prague, CZECH REPUBLIC , Unsp 94501n (2015). http://doi.org/10.1117/12.2068198
Abstract: Ag nanocluster-doped glasses have been prepared by a conventional melt-quenching method. The effect of melt temperature and dwell time on the formation of Ag nanoclusters and Ag nanoparticles in simple host oxyfluoride glasses has been studied. The increase of melt temperature and dwell time results in the dissolution of Ag nanoparticles and substantial red-shift of absorption and photoluminescence spectra of the prepared glasses. The quantum yield of the glasses is similar to 5% and does not depend on melt temperature and dwell time. The prepared glasses may be used as red phosphors or down-conversion layers for solar-cells.
Keywords: P1 Proceeding; Electron microscopy for materials research (EMAT)
DOI: 10.1117/12.2068198
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“Electron relaxation times and resistivity in metallic nanowires due to tilted grain boundary planes”. Moors K, Soree B, Tokei Z, Magnus W, On Ultimate Integration On Silicon (eurosoi-ulis) , 201 (2015)
Abstract: We calculate the resistivity contribution of tilted grain boundaries with varying parameters in sub-10nm diameter metallic nanowires. The results have been obtained with the Boltzmann transport equation and Fermi's golden rule, retrieving correct state-dependent relaxation times. The standard approximation schemes for the relaxation times are shown to fail when grain boundary tilt is considered. Grain boundaries tilted under the same angle or randomly tilted induce a resistivity decrease.
Keywords: P1 Proceeding; Condensed Matter Theory (CMT)
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Van Laer K (2017) Numerical and experimental study of a packed bed plasma reactor for environmental applications. Antwerpen
Keywords: Doctoral thesis; Plasma Lab for Applications in Sustainability and Medicine – Antwerp (PLASMANT)
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Petrovic M (2017) Characterization of scanning gate technique and transport in nanostructured graphene. Antwerpen
Keywords: Doctoral thesis; Condensed Matter Theory (CMT)
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Alania M (2017) Quantification of 3D atomic positions for nanoparticles using scanning transmission electron microscopy: statistical parameter estimation, dose-limited precision and optimal experimental design. Antwerpen
Keywords: Doctoral thesis; Electron microscopy for materials research (EMAT)
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Ferná,ndez Becerra VL (2017) Novel mesoscopic effects and topological states in chiral p-wave superconductors. Antwerpen
Keywords: Doctoral thesis; Condensed Matter Theory (CMT)
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Huygh S (2017) Towards a fundamental understanding of plasma : TiO2 catalyst interaction for greenhouse gas conversion. Universiteit Antwerpen, Antwerpen
Keywords: Doctoral thesis; Engineering sciences. Technology; Plasma Lab for Applications in Sustainability and Medicine – Antwerp (PLASMANT)
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Milovanović, S (2017) Electronic transport properties in nano- and micro-engineered graphene structures. Antwerpen
Keywords: Doctoral thesis; Condensed Matter Theory (CMT)
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Snoeckx R (2017) Plasma technology : a novel solution for CO2 conversion? Antwerpen
Keywords: Doctoral thesis; Engineering sciences. Technology; Plasma Lab for Applications in Sustainability and Medicine – Antwerp (PLASMANT)
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“Laser synthesis of hard carbon for anodes in Na-ion battery”. Zhang B, Deschamps M, Ammar M-R, Raymundo-Pinero E, Hennet L, Batuk D, Tarascon J-M, Advanced Materials Technologies 2, 1600227 (2017). http://doi.org/10.1002/ADMT.201600227
Keywords: A1 Journal article; Electron microscopy for materials research (EMAT)
Times cited: 10
DOI: 10.1002/ADMT.201600227
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