Scalable Conformal Electronics Based on Roll-to-Roll Exfoliated van der Waals Semiconductors

Area of Science:

• Materials Science
• Nanotechnology
• Electronics Engineering

Background:

• Integrating electronics onto complex, non-flat surfaces (e.g., skin, textiles) is crucial for advanced applications.
• Existing methods for 2D semiconductors face challenges in balancing mechanical conformability, electronic performance, and scalable manufacturing.
• Scalable liquid-phase processing often results in poor electronic performance, while high-quality methods (CVD) are complex.

Purpose of the Study:

• To establish a scalable fabrication route for conformal electronics using semiconducting van der Waals materials.
• To enable the integration of high-performance electronic devices onto surfaces with complex topography.

Main Methods:

• Combined high-throughput roll-to-roll mechanical exfoliation with temporary tattoo and waterslide decal transfer substrates.
• Fabricated ultrathin molybdenum disulfide (MoS2)-based electronic devices.

Main Results:

• Successfully transferred MoS2 devices onto diverse rough and curved surfaces, including skin, synthetic leather, and plant leaves.
• Demonstrated reliable device operation post-transfer with strong electronic and optoelectronic performance.
• Achieved high responsivity in photodetectors (~3.5 A W⁻¹), significant temperature coefficients in thermistors (-2 to -3.5% °C⁻¹), and good mobilities in field-effect transistors (~18 cm² V⁻¹ s⁻¹).

Conclusions:

• The developed method offers a scalable and effective approach for producing conformal electronics from van der Waals materials.
• This technique overcomes limitations of previous methods, enabling high-performance electronics on challenging substrates.
• The findings pave the way for advanced wearable electronics, bio-integrated devices, and flexible electronic systems.