High-Mobility All-Transparent TFTs with Dual-Functional Amorphous IZTO for Channel and Transparent Conductive...

Area of Science:

• Materials Science
• Electronics Engineering

Background:

• Growing demand for transparent and flexible displays drives research into advanced thin-film transistors (TFTs).
• Key requirements include high charge carrier mobility, optical transparency, and mechanical durability.

Purpose of the Study:

• To fabricate all-transparent TFTs (AT-TFTs) using a dual-functional amorphous indium-zinc-tin-oxide (a-IZTO) material.
• To evaluate a-IZTO for both channel and transparent conductive electrode (TCE) applications.

Main Methods:

• a-IZTO thin films were deposited via radio-frequency magnetron sputtering.
• Compositional tuning of a-IZTO for channel and electrode properties.
• X-ray Diffraction (XRD) for structural analysis, thermal annealing for stability.
• Fabrication and characterization of AT-TFT devices.

Main Results:

• Amorphous nature of a-IZTO confirmed by XRD, ensuring post-annealing stability.
• a-IZTO TCEs achieved 89.57% transparency and maintained low sheet resistance after 100,000 bending cycles.
• Fabricated AT-TFTs demonstrated high field-effect mobility (30.12 cm²/V·s), on/off ratio >10⁸, and low subthreshold swing (0.36 V/dec).
• AT-TFTs achieved a minimum transmittance of 75.46% in the visible range.

Conclusions:

• a-IZTO is a promising dual-functional material for transparent conductive electrodes and channel layers in AT-TFTs.
• The developed AT-TFTs exhibit excellent performance metrics suitable for advanced transparent and flexible display applications.