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Digital printing of 2D materials using laser light

Researchers have used laser-induced forward transfer (LIFT) to print single-layer graphene pixels, a promising step for creating printed circuits from 2D materials. They produced high-mobility graphene field effect transistors (GFETs) on a flexible substrate as part of the Horizon Europe project L2D2, a collaboration between NTU of Athens and Graphenea in Spain. Their work was presented at the SPIE Photonics Europe 2024 conference.

Researcher Filimon Zacharatos showcased the printing of 2D material pixels with sizes ranging from 40 to 200 micrometers. The study highlighted digital printing methods to produce metal contacts on flexible substrates, followed by LIFT deposition of graphene. The resulting graphene transistors achieved high carrier mobilities, with the smallest devices reaching a hole mobility of 1800 cm²/Vs. The team also transferred hexagonal boron nitride (hBN) and hBN/graphene stacks.

Launched in October 2022, the project has demonstrated LIFT printing of various 2D materials and aims to scale up their growth and transfer through an eco-friendly process. L2D2 seeks to achieve 8-inch scale upscaling of 2D materials and wafer-scale integration using laser-assisted transfer.

Read more on Graphenea's page

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