Regensburg 2022 – wissenschaftliches Programm

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HL: Fachverband Halbleiterphysik

HL 25: Poster 1

HL 25.81: Poster

Mittwoch, 7. September 2022, 18:00–20:00, P2

Establishment of a method to make PL measurements on optically active layers in different dielectric structures comparable — •Sayed Shkeebullah Sadat, Danial Kohminaei, Timo Kruck, Hans-Georg Babin, Andreas Wieck, and Arne Ludwig — Ruhr-Universität Bochum, Bochum, Deutschland

To improve extraction of photoemission from optically active layers such as quantum dots (QDs) or quantum wells (QWs) one can e.g. grow them inside dielectric structures (DBR - distributed Bragg reflector). However, the emerging wavelength-dependent standing wave field alters the spectral intensity of the quantum emitters, which means straightforward comparisons of photoluminescence (PL) measurements are no longer possible. Therefore we present a method by which you can obtain the unaltered spectrum. To calculate the standing field we determine the specific reflectivity first and adjust it to the true thickness of the layers. From here it is possible to determine the efficiency of the photon extraction and thus the quantum yield, which allows us to calibrate and transfer the spectra back to its unmodified form. Since this can be performed on any dielectric structure it now is possible to compare the calibrated spectra with each other. Furthermore there is a possibility to automate this process, allowing the instantaneous comparison of PL measurements on optically active layers in DBR surroundings. To verify the validity of this method the calibrated spectrum is compared to the spectra of cleaved-edge probes, where the DBR has no notable influence since the photons are detected from the side here.

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