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HL: Fachverband Halbleiterphysik

HL 35: Poster I

HL 35.35: Poster

Tuesday, March 8, 2016, 15:00–19:00, Poster A

Excitation spectroscopy of higher quantized states in GaInN quantum wells — •Tim Käseberg, Fedor Alexej Ketzer, Heiko Bremers, Uwe Rossow, and Andreas Hangleiter — Institut für Angewandte Physik, Technische Universität Braunschweig

In order to gain better knowledge about their structure and composition, we examine thin GaInN single and multiple quantum well structures with the help of their higher quantized states. Thus we set up a photoluminescence excitation spectroscopy (PLE) experiment. We excite the samples using a 150 W xenon arc lamp in the region of 360 to 520 nm, dispersed by a double-prism monochromator. The photoluminescence is then detected by a second monochromator and a silicon photodiode using a lock-in amplifier. Similar samples with different growth parameters were examined at various excitation wavelengths at room temperature. The composition of the samples influence the overlap of the wave functions and therefore their efficiency. Higher quantized states help to investigate the inner structure of these samples. Since the inhomogeneous broadening is relatively high, higher quantized states are hard to determine. Therefore we computed the absorption spectra of the samples by simulation of the quantum well and compared them to the observed PLE spectra. Similar characteristics are observed.