Now showing items 1-14 of 14

  • Bathen, Marianne Etzelmüller; Coutinho, José; Ayedh, Hussein Mohammed Hussein; Hassan, Jawad U; Farkas, Ildiko; Öberg, Sven; Frodason, Ymir Kalmann; Svensson, Bengt Gunnar; Vines, Lasse (Journal article / Tidsskriftartikkel / AcceptedVersion; Peer reviewed, 2019)
    We investigate the migration mechanism of the carbon vacancy (VC) in silicon carbide (SiC) using a combination of theoretical and experimental methodologies. The VC, commonly present even in state-of-the-art epitaxial SiC ...
  • Reinertsen, Vilde Mari; Weiser, Philip Michael; Frodason, Ymir Kalmann; Bathen, Marianne Etzelmüller; Vines, Lasse; Johansen, Klaus Magnus H (Journal article / Tidsskriftartikkel / AcceptedVersion; Peer reviewed, 2020)
    The effect of lattice anisotropy on the diffusion of hydrogen (H)/deuterium (2H) in β-Ga2O3 was investigated using secondary ion mass spectrometry (SIMS) and hybrid-functional calculations. Concentration-depth profiles of ...
  • Frodason, Ymir Kalmann; Johansen, Klaus Magnus H; Galeckas, Augustinas; Vines, Lasse (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2019)
    Zn substitutional lithium ( Li Zn ) and sodium ( Na Zn ) acceptors and their complexes with common donor impurities ( Al Zn , Hi, and HO) in ZnO have been studied using hybrid functional calculations. The results show ...
  • Zimmermann, Christian; Frodason, Ymir Kalmann; Rønning, Vegard; Varley, Joel B; Vines, Lasse (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2020)
  • Sky, Thomas Neset; Johansen, Klaus Magnus H; Frodason, Ymir Kalmann; Aarholt, Thomas; Riise, Heine Nygard; Prytz, Øystein; Svensson, Bengt Gunnar; Vines, Lasse (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2019)
  • Bathen, Marianne Etzelmüller; Galeckas, Augustinas; Müting, Johanna; Ayedh, Hussein Mohammed Hussein; Grossner, Ulrike; Coutinho, José; Frodason, Ymir Kalmann; Vines, Lasse (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2019)
    Reliable single-photon emission is crucial for realizing efficient spin-photon entanglement and scalable quantum information systems. The silicon vacancy (VSi) in 4H-SiC is a promising single-photon emitter exhibiting ...
  • Borgersen, Jon; Vines, Lasse; Frodason, Ymir Kalmann; Kuznetsov, Andrej; von Wenckstern, Holger; Grundmann, Marius; Allen, Martin; Perez, Jesus Zuniga; Johansen, Klaus Magnus H (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2020)
    The evolution of electrical resistance as function of defect concentration is examined for the unipolar n-conducting oxides CdO, β-Ga2O3, In2O3, SnO2 and ZnO in order to explore the predictions of the amphoteric defect ...
  • Zimmermann, Christian; Verhoeven, Espen Førdestrøm; Frodason, Ymir Kalmann; Weiser, Philip Michael; Varley, Joel B; Vines, Lasse (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2020)
    Deep-level transient spectroscopy measurements are conducted onβ-Ga2O3thin-filmsimplanted with helium and hydrogen (H) to study the formation of the defect levelE∗2(EA=0.71 eV) during heat treatments under an applied ...
  • Zimmermann, Christian; Verhoeven, Espen Førdestrøm; Frodason, Ymir Kalmann; Weiser, Philip Michael; Varley, Joel B; Vines, Lasse (Journal article / Tidsskriftartikkel / AcceptedVersion; Peer reviewed, 2020)
    Deep-level transient spectroscopy measurements are conducted on β-Ga2O3 thin-films implanted with helium and hydrogen (H) to study the formation of the defect level E2 lowast (EA = 0.71 eV) during heat treatments under an ...
  • Aarholt, Thomas; Frodason, Ymir Kalmann; Prytz, Øystein (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2020)
  • Frodason, Ymir Kalmann; Zimmermann, Christian; Verhoeven, Espen Førdestrøm; Weiser, Philip Michael; Vines, Lasse; Varley, Joel B (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2021)
    This work systematically explores 19 unique configurations of the close-associate Ga–O divacancies (VGaVO) in β−Ga2O3, including their complexes with H impurities, using hybrid functional calculations. Interestingly, most ...
  • Zimmermann, Christian; Rønning, Vegard; Frodason, Ymir Kalmann; Bobal, Viktor; Varley, Joel B; Vines, Lasse (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2020)
    A steady-state photocapacitance (SSPC) setup directly connected to the beamline of a MeV ion implanter is utilized to study primary intrinsic defects in β–Ga2O3 generated by He implantation at cryogenic temperatures (120 ...
  • Frodason, Ymir Kalmann; Johansen, Klaus Magnus H; Vines, Lasse; Varley, J.B. (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2020)
    This work explores the luminescence properties of self-trapped holes and impurity-related acceptors using one-dimensional configuration coordinate diagrams derived from hybrid functional calculations. The photoluminescence ...
  • Zimmermann, Christian; Frodason, Ymir Kalmann; Barnard, Abraham Willem; Varley, Joel B; Irmscher, Klaus; Galazka, Zbigniew; Karjalainen, Antti; Meyer, Walter Ernst; Auret, F.D.; Vines, Lasse (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2020)
    Deep-level transient spectroscopy measurements on β-Ga2O3 crystals reveal the presence of three defect signatures labeled E2a, E2b, and E3 with activation energies at around 0.66 eV, 0.73 eV, and 0.95 eV below the conduction ...