Dresden 2026 – scientific programme
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HL: Fachverband Halbleiterphysik
HL 45: Perovskite and Photovoltaics: Spectroscopy
HL 45.5: Talk
Thursday, March 12, 2026, 16:15–16:30, POT/0006
Resolving Ultrafast Conductivity Dynamics in 2D-Perovskites via correlative THz-NIR Spectroscopy — •Lion Krüger1, Fabian Brütting1, Michael Baumann2, Moritz B. Heindl1, Maximilian Spies3, Anna Köhler3, Alexander JC Kühne2, and Georg Herink1 — 1Experimental Physics VIII, University of Bayreuth, Germany — 2Institute of Organic and Macromolecular Chemistry, Ulm University, Germany — 3Experimental Physics II, University of Bayreuth, Germany
Quasi-2D Metal-Halide Perovskites offer flexible tuning of optoelectronic properties via composition and quantum confinement.
In this contribution we present measurements of the ultrafast carrier dynamics and mobilities of 3D- and quasi-2D-methylammonium lead iodide (MAPI) using optical-pump terahertz-probe spectroscopy (OPTP). The comparison with corresponding optical transient absorption measurements allows for the extraction of an ultrafast feature on a picosecond timescale that is correlated with the delayed hot-carrier cooling, known from 3D hybrid perovskites. Here this "hot phonon bottleneck" manifests as a 2D-specific, intensity-dependent signature in the THz-conductivity and is attributed to transient exciton formation [1].
[1] Lion Krüger, Fabian Brütting, Michael Baumann, Moritz B. Heindl, Maximilian Spies, Anna Köhler, Alexander JC Kühne, Georg Herink. "Confinement-induced Ultrafast Conductivity in 2D Perovskites resolved by correlative Terahertz-NIR Spectroscopy". 2025. In review.
Keywords: THz; OPTP; 2D perovskite; THz spectroscopy; ultrafast spectroscopy