Advanced Methods of Semiconductor Research Seminar – Tuesday 17th of March 2026
We cordially invite you to Advanced Methods of Semiconductor Research Seminar on Tuesday 17th of March 2026 at 13:15 in room 321, building A-1, where there will be delivered a lecture:
Molecules, Excitons, and Phonons Interplay – Surface Activity of Core-Shell Nanowires
by Radosław Szymon
from Department of Experimental Physics, Wrocław Tech
The lecture abstract is attached below.
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Lecture abstract:
Semiconductors surface provides a dynamic environment, in which numerous physical and chemical processes occur. External molecules adsorb onto the surface, modifying the local electronic structure. Excitons generated in the bulk propagate through the material and may become trapped at surface states, opening additional radiative and non-radiative channels. At the same time, symmetry breaking at the surface activates additional vibrational modes, which accompany bulk phonons, modified by internal strain field.
In this seminar, I focus on these surface-related phenomena in a well-established model system – gallium nitride nanowires. In such structures, the interplay between molecular adsorption, exciton dynamics, and lattice vibrations can be investigated using photoluminescence and Raman spectroscopy. I will present the spectroscopic signatures of surface effects revealed by these techniques and discuss how they can be used to better understand and optimize GaN nanowires for applications in optoelectronics and photocatalysis.
Research founded by: Polish National Science Centre grant Preludium (no. 2025/57/N/ST11/03230), Minister of Education and Science „Pearl of Sciences” (no. PN/01/0123/2022), and Foundation for Polish Science (no. START 088.2025).
