Ymir Kalmann Frodason

• 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 (2020). Ti- and Fe-related charge transition levels in beta-Ga2O3. Applied Physics Letters.  ISSN 0003-6951.  116(7) . doi: 10.1063/1.5139402 Fulltekst i vitenarkiv.
• Zimmermann, Christian; Frodason, Ymir Kalmann; Rønning, Vegard; Varley, Joel B & Vines, Lasse (2020). Combining steady-state photo-capacitance spectra with first-principles calculations: the case of Fe and Ti in β-Ga2O3. New Journal of Physics.  ISSN 1367-2630.  22 . doi: 10.1088/1367-2630/ab8e5b Fulltekst i vitenarkiv.
• Zimmermann, Christian; Rønning, Vegard; Frodason, Ymir Kalmann; Bobal, Viktor; Varley, Joel B & Vines, Lasse (2020). Primary intrinsic defects and their charge transition levels in beta-Ga2O3. PHYSICAL REVIEW MATERIALS.  ISSN 2475-9953.  4(7) . doi: 10.1103/PhysRevMaterials.4.074605 Fulltekst i vitenarkiv.
• Zimmermann, Christian; Verhoeven, Espen Førdestrøm; Frodason, Ymir Kalmann; Weiser, Philip Michael; Varley, Joel B & Vines, Lasse (2020). Formation and control of the E2* center in implanted b-Ga2O3 by reverse-bias and zero-bias annealing. Journal of Physics D: Applied Physics.  ISSN 0022-3727.  53(46) . doi: 10.1088/1361-6463/aba64d Fulltekst i vitenarkiv.
• Aarholt, Thomas; Frodason, Ymir Kalmann & Prytz, Øystein (2020). Imaging defect complexes in scanning transmission electron microscopy: Impact of depth, structural relaxation, and temperature investigated by simulations. Ultramicroscopy.  ISSN 0304-3991.  209 . doi: 10.1016/j.ultramic.2019.112884 Fulltekst i vitenarkiv.
• Borgersen, Jon; Vines, Lasse; Frodason, Ymir Kalmann; Kuznetsov, Andrej; von Wenckstern, Holger; Grundmann, Marius; Allen, Martin; Perez, Jesus Zuniga & Johansen, Klaus Magnus H (2020). Experimental exploration of the amphoteric defect model by cryogenic ion irradiation of a range of wide band gap oxide materials. Journal of Physics: Condensed Matter.  ISSN 0953-8984.  32(50) . doi: 10.1088/1361-648X/abac8b
• Frodason, Ymir Kalmann; Johansen, Klaus Magnus H; Vines, Lasse & Varley, J.B. (2020). Self-trapped hole and impurity-related broad luminescence in β-Ga2O3. Journal of Applied Physics.  ISSN 0021-8979.  127(7) . doi: 10.1063/1.5140742 Fulltekst i vitenarkiv.
• Reinertsen, Vilde Mari; Weiser, Philip Michael; Frodason, Ymir Kalmann; Bathen, Marianne Etzelmüller; Vines, Lasse & Johansen, Klaus Magnus H (2020). Anisotropic and trap-limited diffusion of hydrogen/deuterium in monoclinic gallium oxide single crystals. Applied Physics Letters.  ISSN 0003-6951.  117 . doi: 10.1063/5.0027333 Fulltekst i vitenarkiv. Vis sammendrag

  The effect of lattice anisotropy on the diffusion of hydrogen (H)/deuterium (2H) in b-Ga2O3 was investigated using secondary ion mass spectrometry (SIMS) and hybrid-functional calculations. Concentration-depth profiles of 2H-implanted single crystals show that 2H can diffuse along the direction perpendicular to the (010) surface at temperatures as low as 300 degC, whereas diffusion along the direction perpendicular to the (-201) surface occurs only around 500 degC. For both directions, the evolution of the 2H concentration–depth profiles after heat treatments can be modeled by trap-limited diffusion. Moreover, the traps can be present in the as-received crystals or created during ion implantation. Comparison of the experimentally obtained binding energy for 2H to the trap (2.3+/-0.2 eV) with the binding energies determined from first-principles calculations suggests that intrinsic point defects (e.g., VGa^ib) or defect complexes (e.g., VGa(2)VO(2)) are excellent candidates for the trap and will play a crucial role in the diffusion of H or 2H in b-Ga2O3.

• Bathen, Marianne Etzelmüller; Galeckas, Augustinas; Müting, Johanna; Ayedh, Hussein Mohammed Hussein; Grossner, Ulrike; Coutinho, José; Frodason, Ymir Kalmann & Vines, Lasse (2019). Electrical charge state identification and control for the silicon vacancy in 4H-SiC. npj Quantum Information.  ISSN 2056-6387.  5(1), s 1- 9 . doi: 10.1038/s41534-019-0227-y Fulltekst i vitenarkiv.
• Bathen, Marianne Etzelmüller; Coutinho, José; Ayedh, Hussein Mohammed Hussein; Hassan, Jawad U; Farkas, Ildiko; Öberg, Sven; Frodason, Ymir Kalmann; Svensson, Bengt Gunnar & Vines, Lasse (2019). Anisotropic and plane-selective migration of the carbon vacancy in SiC: Theory and experiment. Physical review B (PRB).  ISSN 2469-9950.  100(1), s 014103-1- 014103-15 . doi: 10.1103/PhysRevB.100.014103 Fulltekst i vitenarkiv.
• Frodason, Ymir Kalmann; Johansen, Klaus Magnus H; Alkauskas, A & Vines, Lasse (2019). Negative- U and polaronic behavior of the Zn-O divacancy in ZnO. Physical review B (PRB).  ISSN 2469-9950.  99(17), s 1- 7 . doi: 10.1103/PhysRevB.99.174106
• Frodason, Ymir Kalmann; Johansen, Klaus Magnus H; Galeckas, Augustinas & Vines, Lasse (2019). Broad luminescence from donor-complexed LiZn and NaZn acceptors in ZnO. Physical review B (PRB).  ISSN 2469-9950.  100(18) . doi: 10.1103/PhysRevB.100.184102 Fulltekst i vitenarkiv.
• Sky, Thomas Neset; Johansen, Klaus Magnus H; Frodason, Ymir Kalmann; Aarholt, Thomas; Riise, Heine Nygard; Prytz, Øystein; Svensson, Bengt Gunnar & Vines, Lasse (2019). Diffusion of indium in single crystal zinc oxide: a comparison between group III donors. Semiconductor Science and Technology.  ISSN 0268-1242.  34(2), s 1- 6 . doi: 10.1088/1361-6641/aafa4c Fulltekst i vitenarkiv.
• Frodason, Ymir Kalmann; Johansen, Klaus Magnus H; Bjørheim, Tor Svendsen; Svensson, Bengt Gunnar & Alkauskas, Audrius (2018). Zn vacancy-donor impurity complexes in ZnO. Physical review B (PRB).  ISSN 2469-9950.  97(10), s 1- 8 . doi: 10.1103/PhysRevB.97.104109
• Sky, Thomas Neset; Johansen, Klaus Magnus H; Frodason, Ymir Kalmann; Svensson, Bengt Gunnar & Vines, Lasse (2018). The interaction between lithium acceptors and gallium donors in zinc oxide. Journal of Applied Physics.  ISSN 0021-8979.  124(24), s 1- 6 . doi: 10.1063/1.5063326 Fulltekst i vitenarkiv.
• Frodason, Ymir Kalmann; Johansen, Klaus Magnus H; Bjørheim, Tor Svendsen; Svensson, Bengt Gunnar & Alkauskas, Audrius (2017). Zn vacancy as a polaronic hole trap in ZnO. Physical review B (PRB).  ISSN 2469-9950.  95(9) . doi: 10.1103/PhysRevB.95.094105

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• Aarholt, Thomas; Frodason, Ymir Kalmann & Prytz, Øystein (2019). The impact of local relaxation on defect-complex STEM contrast.
• Bathen, Marianne Etzelmüller; Galeckas, Augustinas; Müting, Johanna; Ayedh, Hussein Mohammed Hussein; Grossner, Ulrike; Coutinho, José; Frodason, Ymir Kalmann & Vines, Lasse (2019). Electrical charge-state identification and emission intensity modulation of the silicon vacancy in 4H-SiC.
• Borgersen, Jon; Johansen, Klaus Magnus H; Vines, Lasse; Kuznetsov, Andrej; Frodason, Ymir Kalmann; von Wenckstern, Holger; Grundmann, Marius; Allen, Martin & Perez, Jesus Zuniga (2019). Electrical properties of intrinsic defects in wide band gap oxides.
• Frodason, Ymir Kalmann; Johansen, Klaus Magnus H; Galeckas, Augustinas & Vines, Lasse (2019). Optical properties of donor-complexed Li_Zn in ZnO.
• Bathen, Marianne Etzelmüller; Galeckas, Augustinas; Frodason, Ymir Kalmann; Vines, Lasse & Svensson, Bengt Gunnar (2018). Tuning silicon vacancy formation in 4H-SiC via proton irradiation for quantum technology.
• Bathen, Marianne Etzelmüller; Vines, Lasse; Galeckas, Augustinas; Frodason, Ymir Kalmann & Svensson, Bengt Gunnar (2018). Charge state transitions of the silicon vacancy in 4H-SiC: Combined DLTS, PL and DFT study.
• Bathen, Marianne Etzelmüller; Vines, Lasse; Galeckas, Augustinas; Frodason, Ymir Kalmann & Svensson, Bengt Gunnar (2018). Correlating charge state transitions of the Si vacancy to the S1/S2 peaks in DLTS spectra of n-type 4H-SiC.
• Frodason, Ymir Kalmann; Johansen, Klaus Magnus H; Bjørheim, Tor Svendsen; Vines, Lasse & Svensson, Bengt Gunnar (2018). Hybrid functional study of the Zn-O divacancy in ZnO.
• Grini, Sigbjørn; Borgersen, Jon Arthur; Sky, Thomas Neset; Frodason, Ymir Kalmann; Riise, Heine Nygard & Zimmermann, Christian (2018). Omvisning MENA.
• Bergum, Kristin; Borgersen, Jon Arthur; Ellingsen, Josef Gert Åsheim; Frodason, Ymir Kalmann; Galeckas, Augustinas; Ingebrigtsen, Mads Eide; Kuznetsov, Andrej & Sky, Thomas Neset (2017). Omvisning MiNaLab.
• Frodason, Ymir Kalmann; Bergum, Kristin; Sky, Thomas Neset; Ingebrigtsen, Mads Eide; Borgersen, Jon; Ellingsen, Josef Gert Åsheim; Galeckas, Augustinas & Kuznetsov, Andrej (2017). MiNa-Lab tour highlighting LENS activities.
• Frodason, Ymir Kalmann; Johansen, Klaus Magnus H; Bjørheim, Tor Svendsen; Svensson, Bengt Gunnar & Alkauskas, Audrius (2017). Luminescence from Zn vacancy-donor complexes in ZnO.
• Johansen, Klaus Magnus H; Sky, Thomas Neset; Frodason, Ymir Kalmann; Venkatachalapathy, Vishnukanthan; Svensson, Bengt Gunnar & Vines, Lasse (2017). Tailoring donor diffusion in ZnO by defects and doping.
• Frodason, Ymir Kalmann; Johansen, Klaus Magnus H; Bjørheim, Tor Svendsen; Alkauskas, A & Svensson, Bengt Gunnar (2016). Polaronic hole binding by the Zn vacancy in ZnO.
• Johansen, Klaus Magnus H; Frodason, Ymir Kalmann; Tuomisto, Filip; Makkonen, Ilja & Vines, Lasse (2016). Formation of Zn- and O-vacancy Clusters in ZnO by thermal treatment.
• Johansen, Klaus Magnus H; Sky, Thomas Neset; Vines, Lasse; Frodason, Ymir Kalmann; Riise, Heine Nygard; Bjørheim, Tor Svendsen & Svensson, Bengt Gunnar (2016). The dynamic interplay between intrinsic defects and shallow donor dopants (Al and Ga) in ZnO.
• Johansen, Klaus Magnus H; Sky, Thomas Neset; Vines, Lasse; Frodason, Ymir Kalmann; Riise, Heine Nygard; Bjørheim, Tor Svendsen & Svensson, Bengt Gunnar (2015). The Interplay between Ga Dopants and Intrinsic Defects in ZnO - Seen from the Diffusion Perspective.

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