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Microfibrillated Cellulose Embedded with KCl as a Solid-Dopant Matrix into an Electrolyte-Gated Transistor.

Raquel Bettega1, Angelo C Lucizani1, Isabela Jasper2

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Summary

A novel solid-dopant matrix (SDM) using microfibrillated cellulose and potassium chloride simplifies electrolyte-gated transistors (EGTs). This material acts as an electrolyte reservoir and ion anchor, improving device stability and performance for green electronics.

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Area of Science:

  • Materials Science
  • Electronics Engineering
  • Electrochemistry

Background:

  • Electrolyte retention in electrolyte-gated transistors (EGTs) often requires complex fabrication or viscous electrolytes.
  • Developing simplified device architectures with stable performance is crucial for advancing EGT technology.

Purpose of the Study:

  • To introduce a multifunctional solid-dopant matrix (SDM) for enhanced electrolyte retention and ion anchoring in EGTs.
  • To investigate the performance of EGTs using different electrolyte configurations, including the novel SDM.
  • To demonstrate the potential of the SDM for stable and high-performance transistor operation.

Main Methods:

  • Fabrication of a solid-dopant matrix (SDM) using microfibrillated cellulose (MFC) embedded with potassium chloride (KCl).
  • Systematic investigation of four electrolyte configurations: H2O, MFC:H2O, KCl:H2O, and MFC:KCl:H2O in transistor devices.
  • Characterization of transistor performance, including on/off current ratio, threshold voltage, drain current, transconductance, and electrochemical window.

Main Results:

  • The MFC:KCl SDM effectively retains electrolytes and anchors ions, simplifying EGT architecture.
  • Transistors with MFC:KCl:H2O exhibited stable operation up to -2 V gate voltage with on/off ratios of ~10^3.
  • The SDM compressed the electrochemical window, enabling stable operation and improved performance (Vth=-0.7 V, Idmax=~10^-3 A, Gmmax=~3x10^2 mS) compared to ionic reference devices.

Conclusions:

  • Microfibrillated cellulose-based materials offer a versatile platform for both field-effect and electrochemical transistors.
  • The developed MFC:KCl SDM significantly enhances EGT stability and performance while simplifying device fabrication.
  • This approach aligns with green electronics initiatives by utilizing sustainable materials and avoiding synthetic polymers.