Disputation: Martin Nyborg

Martin Nyborg will defend his thesis “Dominant Defect Complexes in Cuprous Oxide” for the degree of Philosophiae Doctor at the University of Oslo, Faculty of Mathematics and Natural Sciences.

portrait of the candidate

The PhD defence and trial lecture are partly digital. The chair of the defence will moderate the disputation. 

Ex auditorio questions:  the chair of the defence will invite the audience physically present in the auditorium to ask ex auditorio questions.

Join the disputation digitally

Trial lecture

Time and place: May 23, 2022; 10:15 AM, Kelvin (V316) - Fysikkbygningen

“Light Emitting Diodes, working principle and characterization techniques”

Join the trial lecture digitally 

Main research findings

The world’s energy demand is increasing and the conversion of existing energy sources to renewable alternatives is crucial in reducing CO2 emissions. A major contributor to the realization of this is solar cells, which are currently the fastest growing renewable energy resource, and will need to grow at an accelerating rate to meet the demand for renewable energy.

Cu2O is a promising semiconductor for solar cell applications and could be utilized in exciting applications such as semitransparent and flexible substrates. It is a high bandgap material, which opens the possibility of high-efficiency tandem solar cell applications. The efficiency of Cu2O-based solar cells has yet to reach its full potential.

In this work, Cu2O is studied to investigate its electrical properties related to solar cell performance. We have investigated both bulk and thin-film Cu2O to better understand the reason behind the limited performance seen in experimental Cu2O-based solar cells. It is proven challenging to conclusively identify and control the defects within the Cu2O material. The importance of a deep acceptor present in the studied samples is particularly interesting. The effect of such an acceptor is investigated through device simulations and demonstrates clearly how high concentrations will limit Cu2O-based solar cell performance.

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Adjudication Committee

  • Associate professor Patrick Leveque, University of Strasbourg, France
  • Dr. Rosaria Puglisi, CNR Institute for Microelectronics and Microsystems, Italy
  • Professor Ketil Røed, University of Oslo, Norway


  • Professor Eduard Monakhov, Department of Physics, University of Oslo, Norway
  • Dr. Kristin Bergum, Department of Physics, University of Oslo, Norway

Chair of defence

  • Professor Andreas Görgen, Department of Physics, University of Oslo, Norway

Contact information to Department: Line Trosterud Resvold


Published May 6, 2022 3:19 PM - Last modified May 16, 2022 3:09 PM