Porous Semiconducting Polymers Enable High-Performance Electrochemical Transistors.

Area of Science:

• Materials Science
• Organic Electronics
• Polymer Chemistry

Background:

• Organic polymer electrochemical transistors (OECTs) are crucial for flexible electronics and bioelectronics.
• Optimizing OECTs requires balancing redox chemistry, electronic transport, and ion transport.
• Hydrophobic semiconducting polymers hinder ion penetration, limiting OECT performance.

Purpose of the Study:

• To investigate the OECT performance of dense versus porous semiconducting polymer films.
• To explore a facile breath figure approach for fabricating porous polymer films.
• To demonstrate a general strategy for enhancing OECT performance.

Main Methods:

• Fabrication of dense and porous semiconducting polymer films using a breath figure method.
• Characterization of film properties and OECT response.
• Comparison of hydrophobic (DPPDTT, P3HT) and hydrophilic (Pg2T-T) polymers.

Main Results:

• Porous films enabled fast ion doping and high transconductance (up to 364 S cm⁻¹) for hydrophobic polymers.
• The porous morphology improved OECT metrics, rivaling or exceeding hydrophilic polymers.
• Porous structure also enhanced transconductance in hydrophilic polymers.

Conclusions:

• A porous morphology is a general strategy for fabricating high-performance OECTs.
• The breath figure approach offers a facile route to enhance OECT performance.
• This work overcomes limitations of hydrophobic polymers in electrochemical transistors.