All graphene-based thin film transistors on flexible plastic substrates

Area of Science:

• Materials Science
• Electronics Engineering
• Nanotechnology

Background:

• Graphene's unique properties offer potential for advanced electronic devices.
• Flexible electronics require novel materials for active layers, dielectrics, and electrodes.
• Existing flexible transistors often face challenges with performance and durability.

Purpose of the Study:

• To fabricate a high-performance, flexible thin film transistor (TFT) entirely from graphene-based materials.
• To evaluate the electrical and mechanical properties of graphene oxide (GO) as a dielectric layer.
• To demonstrate the viability of graphene for flexible and stretchable electronic applications.

Main Methods:

• Fabrication of a TFT on plastic substrates using a graphene active layer, graphene oxide (GO) dielectrics, and graphene electrodes.
• Characterization of GO dielectric properties, including dielectric constant, leakage current, and breakdown bias.
• Measurement of TFT performance, including hole and electron mobility, and assessment of mechanical flexibility and optical transmittance.

Main Results:

• The GO dielectrics demonstrated a dielectric constant of 3.1 (at 77 K), low leakage current (17 mA/cm²), and high breakdown bias (1.5 × 10⁶ V/cm).
• Graphene-based TFTs achieved hole and electron mobilities of 300 and 250 cm²/(V·s), respectively.
• The fabricated devices exhibited excellent mechanical flexibility and high optical transmittance.

Conclusions:

• A high-performance, flexible all-graphene TFT was successfully fabricated on plastic substrates.
• Graphene oxide proves to be a suitable dielectric material for flexible electronic applications.
• This work represents a significant advancement towards the integration of graphene in flexible and stretchable electronics.