Dresden 2026 – wissenschaftliches Programm
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HL: Fachverband Halbleiterphysik
HL 26: Poster II
HL 26.28: Poster
Mittwoch, 11. März 2026, 09:30–11:30, P1
Optical Composition-Property Relationships in a Lead-Free Isostructural 2D Hybrid Metal-Halide Series — •Nils Kasten1, Jan-H. Littmann1, Meng Yang2, Natalie Dehnhardt-Fehst2, Lukas Gümbel1, Ralph Kusche2,3, Markus Stein1, Johanna Heine2,3, and Sangam Chatterjee1 — 1Institute of Experimental Physics I and Center for Materials Research (ZfM), Justus Liebig University Giessen, Heinrich-Buff-Ring 16, 35392 Giessen, Germany. — 2Department of Chemistry and Material Sciences Center, Philipps-Universität Marburg, Hans-Meerwein-Straße, 35043 Marburg, Germany. — 3Insitute of Chemistry, Carl von Ossietzky Universität Oldenburg, Ammerländer Heerstraße 114-118, 26129 Oldenburg, Germany.
Organic–inorganic metal halides have achieved notable success in photovoltaics. Among these, metal-halide perovskites represent a versatile class of compounds, exhibiting diverse optoelectronic behaviour, ranging from narrow-band emission to broadband white-light photoluminescence (PL), typically arising from self-trapped excitons (STEs). These characteristics render them relevant for optoelectronic applications. In this study, we investigate a lead-free isostructural series of two-dimensional hybrid metal halides, [(R)-1-(4-F)PEA]4 [E2X10]; (R)-1-(4-F)PEA = (R)-1-(4-fluoro) phenylethylammonium, where E = Sb, Bi and X = Cl, Br, I. All compounds share a common structural framework, which allows us to isolate the effects of metal-cation and halide-anion substitution on the optical response. We employ PL and Raman spectroscopy to characterize these compounds.
Keywords: Hybrid Metal Halides; Composition-Property Relationship; Self-Trapped Excitons; Broadband Emission; Lead-Free Optoelectronics