Enhancement of IGZO TFT Performance via Metal-Induced Crystallization: A Pathway to High-Performance Next-Generation...

Area of Science:

• Materials Science
• Semiconductor Physics
• Device Engineering

Background:

• Indium Gallium Zinc Oxide (IGZO) is a key material for thin-film transistors (TFTs).
• Low-temperature processing is crucial for cost-effective manufacturing and flexible electronics.
• Controlling crystallization and defects is vital for device performance and stability.

Purpose of the Study:

• To develop a low-temperature crystallization method for IGZO using metal-induced crystallization (MIC).
• To investigate the effect of zinc (Zn) content on IGZO microstructural evolution and electrical properties.
• To demonstrate the potential of Ti-MIC for high-performance and stable IGZO TFTs.

Main Methods:

• Annealing IGZO films at 400 °C followed by Ti-MIC at 300 °C under ambient oxygen.
• Systematically varying Zn content in IGZO compositions.
• Fabrication and characterization of IGZO TFTs, including electrical performance and stability tests.

Main Results:

• Optimized IGZO composition (In_0.22Ga_0.17Zn_0.61O) achieved highly aligned crystalline phase.
• Achieved excellent TFT performance: mobility of 73.4 cm²/V·s, near-zero V_TH (0.33 V), and low SS (174.9 mV/decade).
• Demonstrated outstanding operational and environmental stability, with minimal degradation under stress and aging.

Conclusions:

• Ti-MIC provides a scalable, low-temperature route to high-performance IGZO TFTs.
• Zn content critically influences crystallization, defect density, and device characteristics.
• This method offers a viable alternative to conventional technologies for next-generation displays and electronics.