From p- to n-Type Mixed Conduction in Isoindigo-Based Polymers through Molecular Design

Area of Science:

• Materials Science
• Organic Electronics
• Bioelectronics

Background:

• Organic mixed ionic and electronic conductors are crucial for advanced bioelectronic applications.
• Developing materials with tunable properties is essential for optimizing device performance.

Purpose of the Study:

• To synthesize and characterize novel polymeric mixed conductors based on isoindigoid building blocks.
• To investigate the structure-property relationships governing their electronic and ionic conductivity.
• To establish molecular design strategies for efficient organic electrochemical transistors (OECTs) in aqueous environments.

Main Methods:

• Synthesis of three distinct isoindigoid-based polymers.
• Characterization using experimental techniques (electrochemical, structural) and computational methods.
• Device fabrication and testing of organic electrochemical transistors (OECTs).

Main Results:

• Achieved polymers with diverse structural and electronic properties by varying isoindigoid scaffolds and comonomers.
• Demonstrated control over charge carrier dominance (hole or electron) through subtle molecular modifications.
• Established clear structure-property correlations for mixed ionic and electronic conduction.

Conclusions:

• Isoindigo-based polymers offer a versatile platform for designing high-performance organic mixed conductors.
• Precise molecular engineering enables fine-tuning of electronic delocalization and charge transport.
• Developed strategies support efficient p-type, n-type, and ambipolar transistor operation in aqueous media.