A scalable method to reduce the contact resistance of graphene

The exceptional electronic properties of graphene make it a material with large potential for low-power, high-frequency electronics. However, the performance of a graphene-based device depends not only on the properties of the graphene itself, but also on the quality of its metal contacts. The lack of effective and manufacturable approaches to establish good ohmic contacts to a graphene sheet is one of the factors that limit today the full application potential of graphene technology.

(a–d) Schematics showing the process sequence for manufacturing the devices and the laser irradiation of graphene in the contact regions. (e) Optical micrograph of one of the measured devices
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An automatic flake-search tool for 2D materials

Researchers at the Aachen Graphene & 2D Materials Center have released an open-source platform to automatically identify and classify exfoliated flakes of two-dimensional (2D) materials on a substrate, shortening one of the most time-consuming and tedious tasks in the study of 2D materials.

Exfoliated flakes of hexagonal Boron Nitride (hBN) on Si/SiO2 substrate. The red contour indicates a flake with a thickness of about 5 nanometers and size of approximately 50µm x 50µm.
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First observation of coherent charge dynamics in graphene quantum dots

In a recent study published in Nature Communications, researchers from RWTH Aachen University and Forschungszentrum Jülich have reported the observation of coherent charge oscillations in bilayer graphene quantum dots. This marks a significant milestone on the way to spin and valley qubits in a two-dimensional material system.

Katrin Hecker (right), Christian Volk (left) and colleagues from RWTH Aachen University have realized the first “charge qubit” in bilayer graphene, marking a significant milestone on the way to spin and valley qubits in a two-dimensional material system. (Photo: Hubert Dulisch/RWTH Aachen University)
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High quality hexagonal Boron Nitride – made in Aachen

Good news for the community working on two-dimensional materials in Europe: a team of researchers at RWTH Aachen University has successfully implemented the process for growing high-quality hexagonal Boron Nitride at atmospheric pressure and high temperature, increasing the resilience of the supply chain of this unique material.

Hexagonal Boron Nitride grown in Aachen: the growth process results in a continuous crystal-layer with crystal grains of the order of a few 100 µm.
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