Regensburg 2025 – wissenschaftliches Programm

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HL: Fachverband Halbleiterphysik

HL 20: Poster I

HL 20.22: Poster

Dienstag, 18. März 2025, 10:00–12:30, P3

Resolving temporal signatures of optical excitations in semiconductor nanostructures — •Lion Krüger, Fabian Brütting, Moritz B. Heindl, and Georg Herink — Experimental Physics VIII, University of Bayreuth, Germany

Characteristic ultrafast signatures in the photo-induced response of nanostructured materials encode the class of optical excitations and characterize the performance for opto-electronic applications. Time-resolved visible transient absorption (TA) spectroscopy and optical pump THz probe (OPTP) spectroscopy are well-established methods for contact-free probing of ultrafast dynamics. Here, we present correlated TA-OPTP measurements performed in a setup that combines multiple probing modalities under identical excitation conditions. In particular, we present different strategies to enhance detection speed and sensitivity, enabling the disentanglement of free carrier and excitonic signatures in semiconductor nanostructures of varying dimensionality and quantum-confinement [1].

[1] Motti, Silvia G., et al. “Exciton Formation Dynamics and Band-Like Free Charge-Carrier Transport in 2D Metal Halide Perovskite Semiconductors”. Advanced Functional Materials 33 (2023)

Keywords: THz; Perovskite; Quantum dots; Optical Pump THz Probe; Transient absorption