Stiffness and Interface Engineered Soft Electronics with Large-Scale Robust Deformability.

Area of Science:

• Materials Science
• Electronics Engineering
• Biomedical Engineering

Background:

• Stretchable electronics offer advanced human-machine interfaces but face challenges balancing electronic performance with mechanical reliability.
• Existing stretchable electronic systems often compromise either conductivity or deformability.

Purpose of the Study:

• To develop a general strategy for creating robust, large-scale deformable electronics.
• To address the strain-induced degradation in stretchable electronic devices and interconnects.

Main Methods:

• Designed a copolymer substrate with mosaic stiff and elastic regions and cross-linked interfaces.
• Utilized hydrogen bonds for conformal attachment of electronic devices and liquid metal (LM) interconnects to specific substrate areas.
• Isolated functional devices from mechanical strain and ensured stable conductivity of LM interconnects during deformation.

Main Results:

• Achieved a modulus contrast of four orders of magnitude in the copolymer substrate.
• Demonstrated that LM interconnect resistances changed by less than one time even under 550% substrate deformation.
• Successfully integrated solar cells, wireless charging antennas, supercapacitors, and light-emitting diodes into a self-powered electronic skin.

Conclusions:

• The developed strategy effectively isolates strain and strengthens interfaces, enabling highly deformable and reliable electronic systems.
• The integrated electronic skin demonstrates stable performance during complex, repeated deformations, suitable for wearable applications.
• This work presents an efficient pathway for realizing energy-autonomous soft electronics with superior mechanical adaptability.