Organic Thin Film Transistors Fabricated by a Solution Process Using Direct Patterned Single-Layer Graphene...

Area of Science:

• Materials Science
• Organic Electronics
• Nanotechnology

Background:

• Organic thin-film transistors (OTFTs) are crucial for flexible electronics.
• Current fabrication methods for electrodes can be complex and introduce contamination.
• Improving charge injection and transport in OTFTs is essential for performance enhancement.

Purpose of the Study:

• To develop a direct, contamination-free method for transferring and patterning single-layer graphene (SLG) for OTFT electrodes.
• To investigate the performance of OTFTs fabricated with SLG electrodes compared to traditional metal electrodes.
• To assess the impact of SLG electrodes on contact resistance and field-effect mobility.

Main Methods:

• Direct transfer of SLG from copper-foil to a polymeric insulator.
• Direct patterning of SLG using soft-lithography for source and drain electrodes.
• Fabrication of 6,13-bis(triisopropylsilylethynyl) pentacene OTFTs in solution.

Main Results:

• Soft-lithography enables easier and more versatile patterning of SLG compared to photolithography.
• OTFTs fabricated with SLG electrodes exhibited approximately a four-fold increase in field-effect mobility.
• The performance enhancement is attributed to a significant decrease in contact resistance.

Conclusions:

• The proposed direct transfer and soft-lithography patterning method offers a simplified and effective route for fabricating high-performance OTFTs.
• SLG electrodes demonstrate superior performance over conventional metal electrodes in solution-processed OTFTs.
• This approach paves the way for advanced, contamination-free fabrication of graphene-based organic electronic devices.