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HL: Fachverband Halbleiterphysik

HL 35: HL Poster II

HL 35.12: Poster

Mittwoch, 3. April 2019, 17:30–20:00, Poster E

Low temperature spectroscopy of phonon replica in group-III-nitride quantum wells — •Conny Becht, Mursal A. Baggash, and Ulrich T. Schwarz — Institude of Physics, Chemnitz University of Technology, Experimental Sensor Science

Phonon replica are side peaks of photoluminescence emission spectra. For InGaN quantum wells (QWs), the energy difference between phonon replica and main peak are multiple of 91  meV, given by the energy of the longitudinal optical phonon (LO phonon). The relative height of the phonon replica and correspondingly for electron-phonon coupling strength is the Huang-Rhys factor S. As coupling to the phonons is relevant for recombination processes, we investigate the spatial variation of the Huang-Rhys factor in InGaN multi quantum well samples. We observe a spatial correlation of the Huang-Rhys factor with dislocation distribution in these samples. The aim of the study is to develop an understanding of the role of phonons in Shockley-Read-Hall and Auger nonradiative recombination.