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Inert-Atmosphere Microfabrication Technology for 2D Materials and Heterostructures.

Aliaksandr Duleba¹, Mikhail Pugachev¹, Mark Blumenau¹

¹P.N. Lebedev Physical Institute of the Russian Academy of Sciences, Moscow 119991, Russia.

|January 23, 2024

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This study presents a compact, low-cost inert atmosphere fabrication setup for creating 2D material devices. This setup enables the fabrication and testing of unstable materials like black phosphorus, extending their usable device lifetime.

Area of Science:

Materials Science
Condensed Matter Physics
Nanotechnology

Background:

Two-dimensional (2D) materials often exhibit instability under ambient conditions, complicating device fabrication.
Existing methods using glove boxes and ex situ lithography offer partial solutions but are not fully integrated.
The development of advanced fabrication techniques is crucial for harnessing the potential of unstable 2D materials.

Purpose of the Study:

To demonstrate a next-generation inert atmosphere fabrication setup for 2D materials.
To enable integrated device fabrication, characterization, and electrical measurements within a controlled nitrogen environment.
To provide a cost-effective and compact solution for laboratories working with sensitive 2D materials.

Main Methods:

Keywords:

2D materials lithography metal films nanofabrication van der Waals heterostructures

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Development of an inert atmosphere (<20 ppm oxygen) fabrication system.

Integration of optical contact mask lithography (2 μm resolution), metal evaporation, and lift-off processes.

In situ sample transfer to a cryostat for electrical measurements within the same inert environment.

Main Results:

Successful fabrication of van der Waals heterostructures using black phosphorus within the inert atmosphere setup.
Demonstration of the fabrication process, including construction principles and budget considerations.
Observation of the degradation of black-phosphorous-based structures over several weeks, highlighting the importance of the inert environment.

Conclusions:

The proposed compact and inexpensive inert atmosphere fabrication setup is feasible for widespread implementation in 2D materials research.
This integrated approach facilitates the study of unstable 2D materials and their heterostructures.
The system enables in-depth analysis of material stability and device performance under controlled conditions.