I work as a senior scientist at SINTEF Materials physics in Oslo. Here I am investigating the material properties of all types of materials, from steel for construction, polymers, catalyst materials for CO2 storage, to semiconductor thin films for solar cells and batteries, using advanced characterization equipment such as tranmission electron microscopy. My passion is to investigate and develop new materials for renewable energy.

New paper out in Journal of Applied physics (Featured Article)

Investigation of the areas with high D07-band emission in multicrystalline silicon wafers using electron microscopy and hyperspectral photoluminescence imaging. Annett Thøgersen, Ingvild J. T. Jensen, Torbjørn Mehl, Ingunn Burud; Espen Olsen, Inga Gudem Ringdalen, Junjie Zhu, and Rune Søndenå. J. Appl. Phys. 135, 133101 (2024)

This paper is part of the work from the Letup project with IFE and NMBU. In this paper we use hyperspectral photoluminescence imaging to locate areas with high D07 band emission peak in high-performance multi-crystalline silicon for solar cell devices. We then explore the fundamental structural origins of the peak using scanning electron microscopy, electron backscatter diffraction, high-resolution scanning transmission electron microscopy, and density functional theory calculations.

New paper and cover photo from the SolOPP project

Interrogation of the Interfacial Energetics at a Tantalum Nitride/Electrolyte Heterojunction during Photoelectrochemical Water Splitting by Operando Ambient Pressure X-ray Photoelectron Spectroscopy. Øystein Dahl, Martin Fleissner Sunding, Veronica Killi, Ingeborg-Helene Svenum, Mathieu Grandcolas, Magnus Andreassen, Ola Nilsen, Annett Thøgersen, Ingvild Julie Thue Jensen, and Athanasios Chatzitakis. ACS Catal. 2023, 13, 17, 11762–11770

This work is from our work investigating the degradation of Tantallum nitride using in-operando XPS at the Max IV synchrotron in Lund.

Two new papers out

1. Annett Thøgersen, Xinwei Sun, Ingvild Thue Jensen,  Øystein Prytz, Truls Norby. In-situ electron loss spectroscopy reveals surface dehydrogenation of hydrated ceria nanoparticles at elevated temperatures. Journal of Physics and Chemistry of Solids Volume 170, November 2022, 110955
2. Annett Thøgersen, Ingvild J. T. Jensen, Joachim S. Graff, Inga Gudem Ringdalen, Patricia Almeida Carvalho, Torbjørn Mehl, Junjie Zhu, Ingunn Burud, Espen Olsen and Rune Søndenå. Investigation of veryintenseD3-band emission in multi-crystalline silicon wafers using electron microscopy and hyperspectral photoluminescence imaging. J. Appl. Phys. 131, 145703 (2022); doi: 10.1063/5.0087119

SolOPP

We have a new project (SINTEF and UiO) SolOPP – A highly efficient and stable electrode for solar-driven water electrolysis, interrogated by advanced operando and in situ techniques. The goal of the SolOPP project is to produce a stable Ta3N5-based photoelectrode that exceeds the limit of 8 mA/cm2 set by the EU and US Energy Departments as a target for commercial exploitation. More information can be seen here.

NanoSol

In a project at SINTEF we developed a method to produce 3-d imensional nanostructures of silicon and aluminum, particles, nano-wires and nano-tunnels, using a self-organizing process. These structures can potentially be used in solar cells, sensors, batteries, and thermoelectric elements that generate electrical power by heat.

Latest publications from NanoSol:

T. Kjeldstad, A Thøgersen, M Stange, A Azarov, E Monakhov and A Galeckas. Monitoring selective etching of self-assembled nanostructured a-Si:Al films. Nanotechnology 30 (2019) 135601

Torunn Kjeldstad, Annett Thøgersen, Marit Stang, Ingvild Thue Jensen, Eduard Monakhov,  and Augustinas Galeckas.  Surface Effects and Optical Properties of Self-Assembled Nanostructured a-Si:Al. Nanomaterials 2019, 9(8), 1106.

Annett Thøgersen, Ingvild J T Jensen, Marit Stange, Arne Røyset, Ole Martin Løvvik, Alexander G Ulyashin and Spyros Diplas Valence charge distribution in homogenous silicon-aluminium thin-filmsJournal of Physics: Condensed Matter, Volume 30, Number 33 (2018)

Annett Thøgersen, Ingvild J T Jensen, Marit Stange, Torunn Kjeldstad, Diego Martinez-Martinez, Ole Martin Løvvik, Alexander G Ulyashin and Spyros Diplas Formation of nanoporous Si upon self-organized growth of Al and Si nanostructuresNanotechnology, Volume 29, Number 31 (2018)

Kjeldstad, T., Thøgersen, A., Nilsen, O., Monakhov, E. and Galeckas, A. Controllable template approach for ZnO nanowire growth.Phys. Status Solidi A, 214: n/a, 1600480 (2017)

Annett Thøgersen, Marit Stange, Ingvild J. T. Jensen, Arne Røyset, Alexander Ulyashin and Spyros Diplas.  Structure and optical properties of aSiAl and aSiAlHx magnetron sputtered thin films. APL Materials, 4, 036103 (2016)

Our PhD student Torunn Kjeldstad has participated in Forsker Grand Prix 2017, and she won the regional final and participated in the national final. Here is her presentation at the regional final, and a page about her research.