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Importance of the substrate's surface evolution during the MOVPE growth of 2D-transition metal dichalcogenides. KU Leuven

Jiongjiong Mo, Salim El Kazzi, Wouter Mortelmans, Ankit Nalin Mehta, Stefanie Sergeant, Quentin Smets, Inge Asselberghs, Cedric Huyghebaert
In this paper, we explore the impact of changing the growth conditions on the substrate surface during the metal-organic vapor phase epitaxy of 2D-transition metal dichalcogenides. We particularly study the growth of molybdenum disulfide (MoS2) on sapphire substrates at different temperatures. We show that a high temperature leads to a perfect epitaxial alignment of the MoS2 layer with respect to the sapphire substrate underneath, whereas a low ...

Benefits of Using a Spatially-Variant Penalty Strength With Anatomical Priors in PET Reconstruction KU Leuven

Yu-Jung Tsai, Georg Schramm, Sangtae Ahn, Alexandre Bousse, Simon Arridge, Johan Nuyts, Brian F Hutton, Charles W Stearns, Kris Thielemans
In this study, we explore the use of a spatially-variant penalty strength in penalized image reconstruction using anatomical priors to reduce the dependence of lesion contrast on surrounding activity and lesion location. This work builds on a previous method to make the local perturbation response (LPR) approximately spatially invariant. While the dependence of lesion contrast on the local properties introduced by the anatomical penalty is ...

Corrosion protection of Cu by atomic layer deposition Vrije Universiteit Brussel

Véronique Cremers, Geert Rampelberg, Kitty Baert, Shoshan Tamar Abrahami, Nathalie Claes, Thais Milagres De Oliveira, Herman Terryn, Sara Bals, Jolien Dendooven, Christophe Detavernier, et al.

Atomic layer deposition (ALD) is a vapor phase technique that is able to deposit uniform, conformal thin films with an excellent thickness control at the atomic scale. 18 nm thick Al2O3 and TiO2 coatings were deposited conformaly and pinhole-free onto micrometer-sized Cu powder, using trimethylaluminum and tetrakis(dimethylamido)titanium(IV), respectively, as a precursor and de-ionized water as a reactant. The capability of the ALD coating to ...

Peculiar alignment and strain of 2D WSe2 grown by van der Waals epitaxy on reconstructed sapphire surfaces KU Leuven

Wouter Mortelmans, Salim El Kazzi, Ankit Nalin Mehta, Danielle Vanhaeren, Thierry Conard, Johan Meersschaut, Thomas Nuytten, Stefan De Gendt, Marc Heyns, Clement Merckling, et al.
The increasing scientific and industry interest in 2D MX2 materials within the field of nanotechnology has made the single crystalline integration of large area van der Waals (vdW) layers on commercial substrates an important topic. The c-plane oriented (3D crystal) sapphire surface is believed to be an interesting substrate candidate for this challenging 2D/3D integration. Despite the many attempts that have been made, the yet incomplete ...

Managing PV power injection and storage, enabling a larger direct consumption of renewable energy: A case study for the Belgian electricity system KU Leuven Universiteit Hasselt

Marc Meuris, Pieter Lodewijks, Raf Ponnette, Frank Meinke-Hubeny, Pieter Valkering, Ronnie Belmans, Jozef Poortmans
© 2018 John Wiley & Sons, Ltd. An overall model and scenario for increasing the share of renewable electricity consumption in the Belgium grid is proposed by simulating different PV and home battery capacities. The model is balancing the electricity generation of these renewable sources on an hourly basis with the historical consumption profiles of 2014, 2015, and 2016 to estimate how much renewable energy can be consumed directly. The ...

Ladder-type high gap conjugated polymers based on indacenodithieno[3,2-b]thiophene and bithiazole for organic photovoltaics Vrije Universiteit Brussel Universiteit Hasselt

Asfaw Negash, Zewdneh Genene, Raghavendran Thiruvallur Eachambadi, Pieter Verstappen, Niko Van den Brande, Jurgen Kesters, Jan D'Haen, Ergang Wang, Koen Vandewal, Wouter Maes, et al.
Two push-pull type conjugated polymers - PIDTT−BTz and PIDTT−DTBTz, based on the ladder-type donor unit indacenodithieno[3,2-b]thiophene (IDTT) and bithiazole (BTz) as acceptor component - are designed and synthesized for photovoltaic applications. The polymers exhibit relatively high optical gaps of ~2.0 eV with strong absorption in the range of 400–600 nm, rendering them of particular interest for the harvesting of indoor light and/or ...