Browsing Det matematisk-naturvitenskapelige fakultet by Author "Weiser, Philip Michael"

Now showing items 1-15 of 15

  • Anisotropic and trap-limited diffusion of hydrogen/deuterium in monoclinic gallium oxide single crystals 
    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 ...
  • Donors and polaronic absorption in rutile TiO2 single crystals 
    Weiser, Philip Michael; Zimmermann, Christian; Bonkerud, Julie; Vines, Lasse; Monakhov, Eduard (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2020)
    We have used a combination of optical absorption and electrical conductivity measurements to study the effect of the main donor on small polarons in rutile TiO2 single crystals rendered n-type conductive by hydrogenation ...
  • Electrically-active defects in reduced and hydrogenated rutile TiO2 
    Bonkerud, Julie; Zimmermann, Christian; Weiser, Philip Michael; Herklotz, Frank; Seiffert, Christoph; Verhoeven, Espen Førdestrøm; Vines, Lasse; Monakhov, Eduard (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2021)
  • Fabrication and characterization of Schottky barrier diodes on rutile TiO2 
    Bonkerud, Julie; Zimmermann, Christian; Weiser, Philip Michael; Aarholt, Thomas; Verhoeven, Espen Førdestrøm; Vines, Lasse; Monakhov, Eduard; Herklotz, Frank (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2020)
  • Formation and control of the E2* center in implanted b-Ga2O3 by reverse-bias and zero-bias annealing 
    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 ...
  • Formation and control of the E2* center in implanted b-Ga2O3 by reverse-bias and zero-bias annealing 
    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 ...
  • Hydrogen-related defects measured by infrared spectroscopy in multicrystalline silicon wafers throughout an illuminated annealing process 
    Weiser, Philip Michael; Monakhov, Eduard; Haug, Halvard; Wiig, Marie Syre; Søndenå, Rune (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2020)
    Hydrogen (H) is thought to be strongly involved in the light and elevated temperature-induced degradation observed predominantly in p-type silicon wafers, but the nature of the defect or defects involved in this process ...
  • Influence of heat treatments in H2 and Ar on the E1 center in β-Ga2O3 
    Langørgen, Amanda; Zimmermann, Christian; Frodason, Ymir Kalmann; Verhoeven, Espen Førdestrøm; Weiser, Philip Michael; Karsthof, Robert Michael; Basile Varley, Joel; Vines, Lasse (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2022)
    The influence of heat treating [Formula: see text]-type bulk [Formula: see text]-Ga[Formula: see text]O[Formula: see text] in hydrogen (H[Formula: see text]) and argon (Ar) gases on the presence of the defect level commonly ...
  • Interplay of vacancies, hydrogen, and electrical compensation in irradiated and annealed n-type β-Ga2O3 
    Karjalainen, Antti; Weiser, Philip Michael; Makkonen, I.; Reinertsen, Vilde Mari; Vines, Lasse; Tuomisto, Filip (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2021)
    Positron annihilation spectroscopy, Fourier transform-infrared absorption spectroscopy, and secondary ion mass spectrometry have been used to study the behavior of gallium vacancy-related defects and hydrogen in deuterium ...
  • Li and group-III impurity doping in ZnSnN2: Potential and limitations 
    Olsen, Vegard Skiftestad; Frodason, Ymir Kalmann; Hommedal, Ylva Knausgård; Nielsen, Dina Marie; Weiser, Philip Michael; Johansen, Klaus Magnus H; Lee, In-Hwan; Kuznetsov, Andrej; Vines, Lasse (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2022)
    II–IV nitrides and their alloys represent an earth-abundant and potentially cost-efficient alternative to the well-developed AlN-GaN-InN system. A major drawback with the II–IV nitrides is that ZnSnN2, the lowest band gap ...
  • Multistability of isolated and hydrogenated Ga-O divacancies in beta-Ga2O3 
    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 ...
  • On the permittivity of titanium dioxide 
    Bonkerud, Julie; Zimmermann, Christian; Weiser, Philip Michael; Vines, Lasse; Monakhov, Eduard (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2021)
    Abstract Conductive rutile TiO 2 has received considerable attention recently due to multiple applications. However, the permittivity in conductive, reduced or doped TiO 2 appears to cause controversy with reported values ...
  • Temperature-Dependent Photochromic Performance of Yttrium Oxyhydride Thin Films 
    Baba, Elbruz Murat; Weiser, Philip Michael; Zayim, Esra; Karazhanov, Smagul (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2020)
    Yttrium oxyhydride (YHO) is a rare‐earth‐metal oxyhydride that has attracted considerable attention due to its outstanding photochromic properties. The transparency of YHO thin films across the infrared and visible spectral ...
  • The Impact of Different Hydrogen Configurations on Light- and Elevated-Temperature- Induced Degradation 
    Hammann, Benjamin; Assmann, Nicole; Weiser, Philip Michael; Kwapil, Wolfram; Niewelt, Tim; Schindler, Florian; Søndenå, Rune; Monakhov, Eduard; Schubert, Martin C. (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2023)
    In this article, the impact of different hydrogen configurations and their evolution on the extent and kinetics of light- and elevated-temperature-induced degradation (LeTID) is investigated in float-zone silicon via charge ...
  • Trapping of multiple H atoms at the Ga(1) vacancy in b-Ga2O3 
    Fowler, W. Beall; Stavola, Michael; Qin, Ying; Weiser, Philip Michael (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2020)
    Recent suggestions that hydrogen incorporation at the Ga(1) vacancy in β-Ga2O3 may have an impact on its electronic properties have led us to extend our earlier work on these defects. While our previous work provides strong ...