Organic Electrochemical Transistors Monolithically Integrated with Precise Micro-Dispensing Enable High-Performance...

Area of Science:

• Bioelectronics
• Materials Science
• Organic Electronics

Background:

• Organic electrochemical transistors (OECTs) are crucial for bioelectronics but face integration challenges.
• High-performance OECTs and their integration are limited, hindering widespread adoption.

Purpose of the Study:

• To report the monolithic integration of OECTs and OECT-based amplifiers on flexible substrates.
• To demonstrate a scalable fabrication method for high-performance printed bioelectronic circuits.

Main Methods:

• Utilized high-resolution micro-dispensing for precise deposition of electronic materials.
• Achieved micrometer-scale resolution and femtoliter-volume control for conductors, semiconductors, insulators, and electrolytes.
• Fabricated OECTs and amplifier circuits entirely on flexible substrates.

Main Results:

• Achieved a record intrinsic gain of 330 V/V for OECTs.
• Developed fully printed amplifier circuits with a maximum voltage gain of 77.5.
• Demonstrated a gain-bandwidth product of 1 MHz for printed OECT amplifiers, the highest reported.
• Enabled real-time acquisition and amplification of electrooculography (EOG) signals with minimal distortion.

Conclusions:

• Micro-dispensing is a scalable and reliable method for manufacturing high-performance printed bioelectronic circuits.
• This work bridges the gap between low-cost fabrication and the performance needs of next-generation bioelectronics.
• The developed technology facilitates the widespread adoption of advanced bioelectronic devices.