Intrinsically Stretchable Organic Electrochemical Transistors with Rigid-Device-Benchmarkable Performance.

Area of Science:

• Bioelectronics
• Materials Science
• Organic Electronics

Background:

• Intrinsically stretchable organic electrochemical transistors (OECTs) are crucial for soft bioelectronic interfaces.
• Current stretchable OECTs exhibit performance limitations compared to rigid devices.
• Advancing stretchable electronics requires overcoming the performance gap with conventional rigid systems.

Purpose of the Study:

• To engineer intrinsically stretchable OECTs with performance comparable to rigid counterparts.
• To investigate the impact of substrate properties on OECT performance, specifically the on/off ratio.
• To demonstrate the potential of high-performance stretchable OECTs for advanced bioelectronic applications.

Main Methods:

• Fabrication of intrinsically stretchable OECTs using novel substrate materials.
• Systematic variation of oxygen levels and permeabilities in stretchable substrates.
• Characterization of OECT performance, including on/off ratio and stability under mechanical strain.

Main Results:

• Achieved intrinsically stretchable OECTs with performance benchmarkable to rigid devices.
• Identified substrate oxygen level as a critical factor influencing OECT on/off ratio.
• Elevated the on/off ratio from approximately 10 to a record-high of 10^4 by using low-oxygen-permeability substrates.
• Demonstrated functional device stability after cyclic stretching tests.

Conclusions:

• Intrinsically stretchable OECTs with performance rivaling rigid devices have been successfully developed.
• Low oxygen permeability of stretchable substrates is key to achieving high on/off ratios in OECTs.
• These high-performance stretchable OECTs are promising building blocks for electronic skin, soft implantables, and neuromorphic computing.