Solution processable multi-channel ZnO nanowire field-effect transistors with organic gate dielectric

Area of Science:

• Materials Science
• Nanotechnology
• Electronics Engineering

Background:

• Nanowire (NW) field-effect transistors (FETs) offer potential for low-cost, large-area electronics.
• Challenges exist in precisely depositing and aligning NWs for reproducible device fabrication.

Purpose of the Study:

• To demonstrate the use of dielectrophoresis (DEP) for controlled assembly of zinc oxide nanowires (ZnO NWs).
• To fabricate high-performance hybrid FETs using aligned ZnO NWs and organic gate dielectrics.
• To evaluate the performance and stability of these hybrid devices for large-area electronics.

Main Methods:

• Utilized dielectrophoresis (DEP) for selective deposition and orientation of ZnO NWs on predefined substrate locations.
• Fabricated top-gate FET devices on glass substrates incorporating organic gate dielectric layers and surrounding source-drain contacts.
• Performed current-voltage (I-V) measurements to characterize device performance under N2 ambient and air exposure.

Main Results:

• Achieved precise alignment and positioning of multiple ZnO NWs using DEP.
• Demonstrated high-performance hybrid ZnO NW FETs with high on/off ratios (~10^7) and electron mobility (~35 cm^2 V^-1 s^-1).
• Confirmed stable device operation after 3 months of air exposure, maintaining excellent performance parameters.

Conclusions:

• Dielectrophoresis (DEP) is an effective technique for assembling NWs from solvent formulations, enabling low-temperature hybrid transistor fabrication.
• The developed hybrid ZnO NW FETs show promise for large-area, low-cost electronic applications.
• The method facilitates the integration of inorganic NWs with organic dielectrics for advanced electronic devices.