Mainz 2026 – wissenschaftliches Programm

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MO: Fachverband Molekülphysik

MO 23: Contributions to SYLC I

MO 23.5: Vortrag

Donnerstag, 5. März 2026, 12:15–12:30, P 110

Femtosecond transient circular dichroism spectroscopy of chiral organic-inorganic lead perovskites — •Thomas Lenzer and Kawon Oum — University of Siegen, Physical Chemistry 2, Adolf-Reichwein-Str. 2, 57076 Siegen

Chiral lead-based perovskites represent promising candidates for the generation of spin-polarized charge carriers, enabling advances in spintronic and optoelectronic applications. We report thin films of hybrid organic-inorganic perovskites that exhibit pronounced circular dichroism (CD) responses reaching 5000 mdeg and dissymmetry factors exceeding 0.10, with negligible contributions from linear dichroism and linear birefringence. Using transient circular dichroism (TrCD) spectroscopy with femtosecond resolution,[1,2] we investigate the ultrafast dynamics of spin-polarized carriers. Complementary transient absorption measurements reveal the dominant relaxation pathways following photoexcitation in these materials.

[1] D. Gust, M. Scholz, V. Schumacher, J.-C. Mulatier, D. Pitrat, L. Guy, K. Oum and T. Lenzer, Sci. Rep. 2024, 14, 12694. [2] M. Morgenroth, M. Scholz, M. J. Cho, D. H. Choi, K. Oum and T. Lenzer, Nat. Commun. 2022, 13, 210.

Keywords: Femtosecond transient CD spectroscopy; Chiral perovskites; Spin polarization; Carrier dynamics; Femtosecond transient absorption spectroscopy