Disputation: Ymir Kalmann Frodason

Doctoral candidate Ymir Kalmann Frodason at the Department of Physics, Faculty of Mathematics and Natural Sciences, is defending the thesis 

"Hybrid functional investigations of point defects in ZnO and β-Ga2O3"

for the degree of Philosophiae Doctor.

portrait of the candidate

The PhD defence and trial lecture are fully digital and streamed using Zoom.  The chair of the defence will moderate the disputation.

Ex auditorio questions: the chair of the defence will invite the audience to ask ex auditorio questions either written or oral. This can be requested by clicking 'Participants' and then choose 'Raise hand'. 


Trial lecture

"Physical and technological challenges of quantum computers"

Recording of the trial lecture will be available here on January 25 until January 27.



Main research findings

Metal oxide semiconductors are widely recognized as prime materials for future energy technology along the low-carbon development path. Zinc oxide and gallium oxide, studied in the present thesis, promise highly efficient optoelectronic and electricity conversion devices. Point defects (zero-dimensional structural imperfections in the crystal lattice) can significantly influence the materials properties of semiconductors, and thus have a defining impact on their functionality, both as enablers and barriers. Understanding and controlling defects is therefore pivotal to the technological development of zinc oxide and gallium oxide.
The present work explores defects in zinc oxide and gallium oxide using first-principles calculations based on density functional theory. Recently developed methodology is employed to predict defect properties that can be compared directly with experimental data from electrical and optical defect spectroscopic techniques, aiding in the identification of prominent and technologically relevant defect signatures, and providing new insights into the defect physics.


Contact information to Department: Line Trosterud Resvold

Published Jan. 13, 2021 2:04 PM - Last modified Jan. 22, 2021 3:09 PM