Regensburg 2022 – wissenschaftliches Programm

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HL: Fachverband Halbleiterphysik

HL 25: Poster 1

HL 25.1: Poster

Mittwoch, 7. September 2022, 18:00–20:00, P2

A versatile transfer printing toolbox for 2D material stacking — •Ioannis Caltzidis, Maja Groll, Julius Bürger, Marc Satison, Jörg K. N. Lindner, and Klaus D. Jöns — Institute for Photonic Quantum Systems, Center for Optoelectronics and Photonics Paderborn, and Department of Physics, Paderborn University, 33098 Paderborn, Germany

2D materials are of great interest to scientists due to the versatile integration with other materials into, for example, Van-der-Waals heterostructures. The resulting nanoscale Moiré superlattices have applications in electronic and photonic quantum technologies. In 2D materials, the electronic band structure is generally determined by the number of layers, species of materials, as well as their angular and relative translational orientation. Transfer printing 2D materials on top of each other or onto different platforms is a frequently used fabrication method for 2D devices in state-of-the-art laboratories worldwide. Here we show how our transfer printing apparatus can be used to deterministically transfer tungsten diselenide (WSe₂) on transmission electron microscope (TEM) grids for high-resolution differential phase contrast measurements, revealing the electronic field distribution. We employ water-assisted and dry transfer methods with WSe₂ on a polyvinylalcohol (PVA) - polymethylmethacrylate (PMMA) or polydimethylsiloxane (PDMS) polymer substrate. The transfer stage’s translational, rotational, and azimuthal degrees of freedom enable deterministic positioning and control in the fabrication process.