All 2D Material Printed Diodes and Circuits on Paper for Sustainable Electronics

Area of Science:

• Materials Science
• Nanotechnology
• Electronics Engineering

Background:

• Sustainable electronics face challenges with resource-intensive methods, rare metals, and unstable nanomaterials.
• Plastic substrates in electronics also pose environmental concerns.
• Solution-processed two-dimensional (2D) materials offer a sustainable alternative using water-based inks on biodegradable paper.

Purpose of the Study:

• To demonstrate the first fully inkjet-printed 2D material-based diodes on paper.
• To develop sustainable and scalable fabrication methods for printed electronic components.
• To integrate these diodes into functional electronic circuits on paper.

Main Methods:

• Utilized water-based graphene and molybdenum disulfide (MoS2) inks prepared via liquid-phase exfoliation.
• Employed electrochemical exfoliation for semiconducting MoS2 ink.
• Fabricated metal-insulator-semiconductor and metal-insulator-metal-semiconductor diodes using inkjet printing at room temperature and ambient pressure.

Main Results:

• Achieved a maximum forward-to-reverse current ratio of 330 and a forward current density of 1 mA/cm² at 1 V.
• Demonstrated stable device performance under bending up to 4% strain over 10,000 cycles.
• Successfully integrated diodes into printed RC circuits, differentiators, integrators, and AC-to-DC converters on paper.

Conclusions:

• The developed method offers a sustainable, low-cost, and scalable approach for fabricating fully printed diodes and integrated circuits on paper.
• This technology avoids high-pressure sputtering, thermal evaporation, and precious metals, aligning with eco-friendly electronics goals.
• The printed devices show promising performance and mechanical stability, suitable for disposable and sustainable electronics applications.