Berlin 2018 – scientific programme

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SYDM: Symposium 2D Materials

SYDM 1: 2D Materials

SYDM 1.4: Invited Talk

Thursday, March 15, 2018, 16:45–17:15, H 0105

Exploring exciton physics in liquid-exfoliated 2D materials — •Claudia Backes — Applied Physical Chemistry, University of Heidelberg, Im Neuenheimer Feld 253, 69120 Heidelberg

Transition metal dichalcogenides (TMDSs) are a diverse source of semiconducting 2D materials interesting for number of application areas. Group VI-TMDs are direct bandgap semiconductors in the monolayer form with strongly bound exciton and trions. The physics of these excitons is of both fundamental interest and importance for exploiting these properties in applications and has been studied by optical techniques typically on micromechanically cleaved nanosheets. In this talk I will review our progress on investigating the exciton physics of layered materials exfoliated in the liquid phase. Liquid phase exfoliation has become a popular technique to obtain nanosheets in the form of colloidally stable dispersions suitable for solution processing. It is an extremely versatile technique that can be applied to a whole host of layered crystals. While dispersions of nanosheets are usually polydisperse containing broad distributions of lateral sizes and thicknesses, they can nonetheless be used to study fundamental physical properties once the distributions are quantified by statistical microscopy. The advantage of the technique is the broad applicability and characterisation of an ensemble eliminating potential variations across different nanosheets. In addition, environmental effects can be conveniently studied by exchanging the liquid environment.