Dresden 2026 – wissenschaftliches Programm

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HL: Fachverband Halbleiterphysik

HL 23: Transport Properties

HL 23.8: Vortrag

Mittwoch, 11. März 2026, 11:30–11:45, POT/0051

Self-Trapped Exciton Diffusion in a Lead-Free Two- Dimensional Hybrid Perovskite — •Jan-Heinrich Littmann¹, Lukas Gümbel¹, Philip Klement¹, Meng Yang², Markus Stein¹, Johanna Heine^2,3, 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 — ³Institute of Chemistry, Carl von Ossietzky Universität Oldenburg, Ammerländer Heerstraße 114-118, 26129 Oldenburg, Germany

Self-trapped excitons (STEs) in low-dimensional metal-halide perovskites arise from lattice distortions. The mobility of such excitations is expected to be limited, however, remains vastly unexplored experimentally.

Here, we directly image STE transport in a lead-free perovskite using spatially and temporally resolved photoluminescence microscopy. The STEs exhibit measurable mobility and propagate over micrometer distances despite their strongly-localized nature. At low temperatures, their motion is limited and nearly temperature independent. Transport becomes thermally activated above 150k and overcomes local energy barriers. Together this infers trap-limited diffusion. These results establish that STEs are mobile under suitable conditions and provide a quantitative framework for STE transport in lead-free perovskite materials.

Keywords: Diffusion; Perovskites; Self-trapped excitons