SKM 2023 – wissenschaftliches Programm

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HL: Fachverband Halbleiterphysik

HL 33: Poster II

HL 33.42: Poster

Mittwoch, 29. März 2023, 17:00–19:00, P1

Temperature dependent Raman spectroscopy on GaN:Si — •Christina Harms, Jona Grümbel, Martin Feneberg, and Rüdiger Goldhahn — Institut für Physik, Otto-von-Guericke-Universität Magdeburg, Germany

GaN structures are of high interest for optical and electronic applications in current research projects. We investigate the Raman excitations of hexagonal bulk GaN:Si under temperature variation from 80 K up to 300 K. Seven samples with carrier concentrations ranging between 1012 - 1019 cm-3 were measured using laser excitation of 532 nm. It is shown, that within room temperature measurements both coupled phonon-plasmon-modes (LPP±) are visible and follow the prediction of polaritonic excitations. Under variation of temperature the LPP+ mode shows a weak frequency shift with elevated temperature or remains unaffected for low carrier concentrations. Surprisingly, the LPP mode shifts towards lower frequencies with increasing temperatures for all samples, which contradicts previous assumptions. A qualitative description of the results and possible interpretations will be presented. Additionally, we also investigated the temperature dependent FWHM of the LPP± mode and the E2 phonon mode. Here, both behaviours match the theoretical and experimental previous research.

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