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HL: Fachverband Halbleiterphysik

HL 33: Poster II

HL 33.9: Poster

Wednesday, March 29, 2023, 17:00–19:00, P1

Rapid hyperspectral imaging of transition metal dichalcogenides and their heterostructures — •Marc Schütte, David Tebbe, Christoph Stampfer, Bernd Beschoten, and Lutz Waldecker — 2nd Institute of Physics A, RWTH Aachen University, Aachen, Germany

Transition Metal Dichalcogenides are two-dimensional semiconductors with many interesting properties for optical applications, such as direct bandgaps in the visible spectral region or optically addressable inequivalent valleys. It is well known, however, that their optical properties can vary spatially by local changes of dielectric screening, doping or strain. Here, we present a measurement setup capable of performing photoluminescence and reflection contrast measurements of 2D heterostructures approximately twenty times faster compared to scanning a focal spot over the sample. The setup is based on simultaneously taking spectra along a line with an imaging spectrometer (push-broom technique), which enables the measurement of multiple spectra simultaneously. The speed of the technique allows for taking images in multidimensional sweeps of parameters, such as gate voltages or magnetic fields.

In this way, the measurements can be conducted by imaging sample regions up to the full size of the heterostructure for each sweep. This allows to distinguish inhomogeneities and enhances the statistical relevance of the data.