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Group Seminar 2023/24

Group Seminar
Wednesday 22 November 2023, 14:00-15:00
William Henry Bragg LT (2.37)
Dr Sara Dale
Department of Physics, University of Bath
Chemical Doping of 2D Transition Metal Dichalcogenides


Transition metal dichalcogenides (TMD), which consist of a transition metal (M), a chalcogen (X) and have the formula MX2, have shown to have a whole array of interesting electronic properties including semiconducting, metallic and superconductivity. Manipulation of these properties has taken many forms including chemical surface functionalisation, intercalation of molecules in between layers and electric field doping. The latter of these techniques allows precise control of the electronic state of the 2D material meaning a semiconducting insulating 2D material can be doped into the conducting state. An ionic liquid field effect transistor is one example of electric field doping and has been shown to induce extremely high doping due to the high capacitance created at the 2D material/ionic liquid interface. An ionic liquid is placed on top of the 2D material and a voltage is applied to an electrode in the liquid so as to induce charge separation within the liquid. The compact electrical double layer formed at the interface between the liquid and the 2D material induces a high level of doping and in this talk I will discuss the role the ionic liquid plays in changing the electrical properties of MoS2.