Regensburg 2025 – wissenschaftliches Programm
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HL: Fachverband Halbleiterphysik
HL 42: Quantum Dots and Wires: Optics I
HL 42.7: Vortrag
Mittwoch, 19. März 2025, 18:30–18:45, H17
Insights from Long-Delay Transient Absorption Spectroscopy in Indium Phosphide Quantum Dots — •Claudio Pineda-Bosque1 and Holger Lange2 — 1Institute of Physics and Astronomy, University of Potsdam Karl-Liebknecht-Strasse 24-25, 28.1.029 14476 Potsdam, Germany — 2Institute of Physics and Astronomy, University of Potsdam Karl-Liebknecht-Strasse 24-25, 28.1.029 14476 Potsdam, Germany
This study investigates the electron dynamics of indium phosphide quantum dots (InP QDs) using long-delay transient absorption (TA) spectroscopy. Nanosecond processes are apparent in time-resolved photoluminescence spectroscopy, but the assignment of the involved carriers is difficult. By using long-delay TA we can explore the processes of carrier relaxation, recombination, and energy transfer in InP QDs across different timescales with a more direct access to the carrier populations. First experiments allow disentangling defect- related dynamics from multi-carrier processes. The goal of the ongoing study is to provide insights into the role of surface states, and the influence of size-dependent effects on the dynamics. We hope to highlight the significance of slow electron processes for understanding and optimizing InP QDs.
Keywords: Quantum dots; Transient Absorption; Size dependance; Slow electron processes