• Nucleation and Early Growth of Multicrystalline Solar Cell Silicon 

      Brynjulfsen, Ingvild Margrete (Doktoravhandlinger ved NTNU, 1503-8181; 2012:355, Doctoral thesis, 2012)
      As the production of solar cell silicon evolves and new concepts are introduced, the need for a more complete understanding of the basic principles of silicon solidification is also increasing. Nucleation has previously ...
    • Nucleation and Growth of High Performance Multicrystalline Silicon (HPMC-Si) in Si3N4 and SiC Coated Crucibles 

      Narayanankutty, Divya (Master thesis, 2019)
      The silicon material for photovoltaic (PV) industry demands high quality. It is known that dislocation clusters are among the foremost limiting effects on the minority carrier lifetime, and thus the PV efficiency. The ...
    • Nucleation and growth of multicrystalline silicon 

      Undheim, Espen (Doctoral theses at NTNU;2018:42, Doctoral thesis, 2018)
      This work has focused on the nucleation process of multicrystalline silicon (mc-Si) for photovoltaic (PV) applications during solidification in α-Si3N4 coated crucibles, the typical crucible coating used commercially. ...
    • Nucleation of Primary Mg2Si in Al-Mg-Si Alloys 

      Grøstad, Torstein (Master thesis, 2014)
      Al-Mg2Si Metal Matrix Composites have the potential to replace the frequently used near- and hyper-eutectic Al-Si alloys. In the as-cast condition, these alloys can contain coarse dendritic primary Mg2Si particles which ...
    • Nucleation of SiO2-CaO-Al2O3 Slag in Oxidative Ladle Refining of Metallurgical Grade Silicon 

      Bjørnstad, Erlend Lunnan; Tranell, Gabriella (Peer reviewed; Journal article, 2021)
      Oxidative ladle refining (OLR) is the most used refining method in industrial production of metallurgical grade silicon. OLR is performed by purging the liquid alloy with oxygen-enhanced air at 1823 K to 1873 K, reacting ...
    • Numerical Modeling of Hydrogen Fluoride Adsorption 

      Christensen, Eskil (Master thesis, 2021)
      Produksjonsmengden av aluminium øker for hvert år. For å møte etterspørselen, øker aluminiumsverk spenningen i elektrolysecellene for å øke produksjonen, men også den økonomiske gevinsten. En bi-effekt av dette er økt ...
    • Numerical modelling and photo-electrochemical characterization of dye sensitized solar cells 

      Hadler-Jacobsen, Jacob (Master thesis, 2017)
      Current-potential characteristics were recorded, and intensity modulated photocurrent spectroscopy (IMPS), intensity modulated photovoltage spectroscopy (IMVS), and electrochemical impedance spectroscopy (EIS) was performed ...
    • Numerical modelling of a Czochralski furnace with active cooling jacket - Optimization of quality and througput 

      Li, Zhengyu (Master thesis, 2015)
      In the single crystal silicon Czochlarski process, pull rate has a great impact on its production. More and more people put their eyes on optimizing the structure of Cz furnace to increase the pull rate, but experiments ...
    • Numerical simulation of bubble growth in a supersaturated solution 

      Vachaparambil, Kurian J.; Einarsrud, Kristian Etienne (Journal article; Peer reviewed, 2020)
      In this paper, a Volume of Fluid (VOF) based approach to simulate the growth of a pre-existing bubble in a supersaturated solution is developed and implemented in OpenFOAMⓇ. The model incorporates the Compressive Continuous ...
    • Numerical simulation of continuum scale electrochemical hydrogen bubble evolution 

      Vachaparambil, Kurian J.; Einarsrud, Kristian Etienne (Peer reviewed; Journal article, 2021)
      One of the important aspects in improving the efficiency of electrochemical processes, such as water electrolysis, is the efficient removal of bubbles which evolve from the electrodes. Numerical modelling based on Computational ...
    • Numerisk modellering av tilbakeglødingsoppførsel i utvalgte aluminiumslegeringer 

      Reiten, Mads (Master thesis, 2011)
      I denne rapporten er det tatt for seg modellering av mykningsreaksjoner etter deformasjon for AA1200- og AA3103-legeringer. Grunnleggende teori rundt mykningsreaksjonene for disse legeringene er presentert. Det er hentet ...
    • Observation of cation-specific critical behavior at the improper ferroelectric phase transition in Gd2(MoO4)3 

      Nylund, Inger-Emma; Tsoutsouva, Maria; Grande, Tor; Meier, Dennis (Journal article; Peer reviewed, 2022)
    • Observation of Electric-Field-Induced Structural Dislocations in a Ferroelectric Oxide 

      Evans, Donald; Småbråten, Didrik Rene; Holstad, Theodor Secanell; Vullum, Per Erik; Mosberg, Aleksander Buseth; Yan, Zewu; Bourret, Edith; Van Helvoort, Antonius; Selbach, Sverre Magnus; Meier, Dennis (Peer reviewed; Journal article, 2021)
      Dislocations are 1D topological defects with emergent electronic properties. Their low dimensionality and unique properties make them excellent candidates for innovative device concepts, ranging from dislocation-based ...
    • Observation of uncompensated bound charges at improper ferroelectric domain walls 

      Schoenherr, Peggy; Shapovalov, Konstantin; Schaab, Jakob; Yan, Zewu; Bourret, Edith; Hentschel, Mario; Stengel, Massimiliano; Fiebig, Manfred; Cano, Andrés; Meier, Dennis (Journal article; Peer reviewed, 2019)
      Low-temperature electrostatic force microscopy (EFM) is used to probe unconventional domain walls in the improper ferroelectric semiconductor Er0.99Ca0.01MnO3 down to cryogenic temperatures. The low-temperature EFM maps ...
    • Observation of Unconventional Dynamics of Domain Walls in Uniaxial Ferroelectric Lead Germanate 

      Bak, Ohheum; Holstad, Theodor Secanell; Lu, Haidong; Evans, Donald; Hunnestad, Kasper Aas; Wang, Bo; Becker, Petra; Bohatý, Ladislav; Helvoort, Antonius T. J. van; Gregg, J Marty; Meier, Dennis Gerhard; Gruverman, Alexei (Peer reviewed; Journal article, 2020)
      Application of scanning probe microscopy techniques such as piezoresponse force microscopy (PFM) opens the possibility to re‐visit the ferroelectrics previously studied by the macroscopic electrical testing methods and ...
    • Octahedral coupling in (111)- and (001)-oriented La0.7Sr0.3MnO3/SrTiO3 heterostructures 

      Moreau, Magnus; Selbach, Sverre Magnus; Tybell, Per Thomas Martin (Journal article; Peer reviewed, 2018)
      Rotations and distortions of oxygen octahedra in perovskites play a key role in determining their functional properties. Here, we investigate how octahedral rotations can couple from one material to another in La2/3Sr1/3 ...
    • Octoxy capped Si nanoparticles synthesized by homogeneous reduction of SiCl4 with crown ether alkalide 

      Sletnes, Malin; Jerome, Maria; Grande, Tor; Lindgren, Mikael; Einarsrud, Mari-Ann (Journal article; Peer reviewed, 2014)
      Blue-green luminescent octoxy capped Si nanoparticles were synthesized via homogeneous reduction of SiCl4 with the crown ether alkalide K+(15-crown-5)2K− in tetrahydrofuran. The Si nanoparticles were characterized with ...
    • On design, modelling, and analysis of a 10‐MW medium‐speed drivetrain for offshore wind turbines 

      Wang, Shuaishuai; Rasekhi Nejad, Amir; Moan, Torgeir (Peer reviewed; Journal article, 2020)
      Utformingen av et drivverk med middels hastighet for 10-MW referanse offshore vindturbin for Danmarks Tekniske Universitet (DTU). Det foreslås en fire-punkts drivlinjeoppsett som er utstyrt med en girkasse med to planetrinn ...
    • On Gaseous Emissions During Alumina Feeding 

      Gylver, Sindre Engzelius; Follo, Åste Hegglid; Aulie, Vegard; Granlund, Helene Marie; Sørhuus, Anders; Sandnes, Espen; Einarsrud, Kristian Etienne (Peer reviewed; Journal article, 2021)
      Aluminium electrolysis involves feeding of alumina into a cryolite-based bath. Water originating from alumina as well as from air reacts with fluorides and results in HF evolution. Untreated HF gas is a significant ...
    • On intermetallic phases formed during interdiffusion between aluminium alloys and stainless steel 

      Bergh, Tina; Arbo, Siri Marthe; Hagen, Anette Brocks; Blindheim, Jørgen; Friis, Jesper; Khalid, Muhammad Zeeshan; Ringdalen, Inga Gudem; Holmestad, Randi; Westermann, Ida; Vullum, Per Erik (Peer reviewed; Journal article, 2022)
      One of the major challenges in welding of aluminium (Al) alloys and steels is the growth of brittle intermetallic phases, which depends on the thermomechanical processing history and the alloying elements. This work focuses ...