Solution-processable, low-voltage, and high-performance monolayer field-effect transistors with aqueous stability and...

Area of Science:

• Materials Science
• Organic Electronics
• Nanotechnology

Background:

• Development of high-performance field-effect transistors (FETs) is crucial for advanced electronic applications.
• Solution-processed organic semiconductors and dielectrics offer pathways to low-cost fabrication.
• Achieving high sensitivity in FET-based sensors requires precise control over material morphology and interfaces.

Purpose of the Study:

• To demonstrate low-voltage, low-cost, high-performance monolayer field-effect transistors.
• To utilize core-cladding liquid-crystalline pentathiophenes for ordered monolayer formation.
• To develop a sensitive reporter system for analyte detection using these novel FETs.

Main Methods:

• Spin-coating of core-cladding liquid-crystalline pentathiophenes to form densely packed, long-range ordered monolayers.
• Solution processing of a high-k HfO2-based nanoscale gate dielectric.
• Fabrication and characterization of monolayer field-effect transistors.
• Testing of light-sensitivity and analyte detection capabilities.

Main Results:

• Successful demonstration of low-voltage, low-cost, high-performance monolayer FETs.
• Achieved densely packed, long-range ordered monolayers from liquid-crystalline pentathiophenes.
• Exhibited light-sensitive transistor behavior.
• Demonstrated ultrahigh sensitivity (≈10 ppb) in converting analyte binding events to electrical signals.

Conclusions:

• Monolayer field-effect transistors based on liquid-crystalline pentathiophenes and HfO2 dielectrics offer a promising platform for sensitive electronic reporters.
• The developed fabrication method enables low-cost, high-performance devices.
• These transistors show potential for various sensing applications requiring high sensitivity and low operating voltage.