Optical and structural studies of nanoscale light emitters

PhD defence, Tuesday 13 March 2018, Søren Roesgaard Nielsen

2018.03.13 | Helle Karvonen

Søren Roesgaard Nielsen

Illustration of tin nanocrystal embedded in silicon with the elements highlighted in the periodic table.

Silicon is widely used in computer processors as the electronic backbone. Combining the silicon electronic elements with optical functionalities could lead to much faster computers by transferring the data as light instead of electrically. However, silicon is poor light emitter by itself, but a possible solution is to embed nanostructures into the silicon.

Søren Roesgaard has investigated tin nanocrystals as such nanostructures and their potential as light emitters. Combining results from multiple analysis methods such as photoluminescence spectroscopy and scanning tunneling microscopy the mechanism behind the light emission is investigated.

Understanding the fundamental limitations of such systems could help identifying and overcoming the processes that limit the light emission efficiency. This could help develop high-efficiency light emitters, enabling the integration of electronic and optical technologies onto one computer chip.

The Ph.D. degree was completed at the Interdisciplinary Nanoscience Center (iNANO), Science and Technology, Aarhus University.

This résumé was prepared by the Ph.D. student.

Time: Tuesday 13 Marts 2018, kl. 12.15

Place: 1593-012 (aud.), iNANO, Gustav Wieds Vej 14, Aarhus University, 8000 Aarhus C.
Title of dissertation: Light-emitting tin nanocrystals embedded in silicon
Contact information: Søren Roesgaard, e-mail: roesgaard@inano.au.dk, tel.: +45 28781425
Members of the assessment committee:

Senior research associate Philippe Boucaud, Institut dÉlectronique Fondamentale, Universite Paris Sud, France

Associate emeritus Erik Johnson, Niels Bohr Institute, Copenhagen University, Denmark

Associate professor Jeppe Vang Lauritsen (chair), iNANO and Department of Physics and Astronomy, Aarhus University, Denmark

Main supervisor:
Associate Professor Brian Julsgaard, iNANO and Department of Physics and Astronomy, Aarhus University, Denmark

Professor Emeritus Arne Nylandsted Larsen, iNANO and Department of Physics and Astronomy, Aarhus University, Denmark
Language: The Ph.D. dissertation will be defended in English

The defense is public.
The dissertation is available for reading at the Graduate School of Science and Technology/GSST, Ny Munkegade 120, building 1520, rooms 128-134, 8000 Aarhus C.

PhD defence
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Revised 23.03.2018