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A new figure of merit, the product of electronic mobility and charge storage capacity (µC*), is introduced for organic electrochemical transistors (OECTs). This metric aids in designing and benchmarking organic mixed conductors for improved performance.

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Area of Science:

  • Materials Science
  • Organic Electronics
  • Electrochemistry

Background:

  • Organic mixed conductors are crucial for bioelectronics and energy applications.
  • Organic electrochemical transistors (OECTs) require efficient charge transport and ion injection for high performance.
  • Existing conducting polymers have limitations in functionality, processability, and stability.

Purpose of the Study:

  • To establish a materials/system figure of merit for OECTs.
  • To benchmark and compare the performance of ten previously reported OECT materials.
  • To guide the design and processing of new organic mixed conductors.

Main Methods:

  • Defining the figure of merit as the product of electronic mobility and volumetric charge storage capacity (µC*).
  • Benchmarking steady-state OECT performance of ten materials using the µC* framework.
  • Analyzing the independent verification and decoupling of mobility and charge storage.

Main Results:

  • The product µC* serves as a key figure of merit for OECTs.
  • The framework allows for effective benchmarking of diverse OECT materials.
  • Materials design and processing can be guided by independently assessing mobility and charge storage.

Conclusions:

  • OECTs are valuable tools for understanding and designing novel organic mixed conductors.
  • The µC* metric provides a clear pathway for optimizing materials for OECT applications.
  • This research advances the development of high-performance organic electronic devices.