Regensburg 2022 – scientific programme
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DS: Fachverband Dünne Schichten
DS 12: 2D Materials 4 (joint session HL/CPP/DS)
DS 12.2: Talk
Tuesday, September 6, 2022, 10:00–10:15, H36
Optical Spectroscopy of Colloidal Transition Metal Dichalcogenides — •André Philipp Frauendorf1, André Niebur2, Jens Hübner1, Jannika Lauth2,3, and Michael Oestreich1 — 1Institut für Festkörperphysik, Leibniz Universität Hannover — 2Institut für Physikalische Chemie und Elektrochemie, Leibniz Universität Hannover — 3Institut für Physikalische und Theoretische Chemie, Universität Tübingen
Atomically thin transition metal dichalcogenides (TMDs) are at the forefront of a new generation of two-dimensional semiconductor systems and experience an increasing research interest due to their unique optical properties. As an additional fabrication approach the wet-chemical synthesis has emerged as a promising method for the straightforward solution-processing of these materials. [1] Nevertheless, the optical properties of colloidal TMD mono- and few-layer structures have been sparsely studied.
Here, we demonstrate room-temperature micro-photoluminescence of colloidal TMD nanosheets. Both, mono-and multilayer photoluminescence are observed rendering these delicate structures fully competitive with conventionally fabricated TMDs. [1] In addition temperature-dependent transient absorption measurements are presented as a convincing technique for the exploration of the ultra-fast recombination dynamics of two-dimensional materials. [2]
[1] A. Frauendorf et al., J. Phys. Chem. C 125, 18841 (2021).
[2] A. Frauendorf et al., Manuscript in preparation (2022).