Stable and reliable IGZO resistive switching device with HfAlOinterfacial layer

Area of Science:

• Materials Science
• Electrical Engineering
• Nanotechnology

Background:

• Resistive switching (RS) performance stability is crucial for resistive random-access memory (ReRAM) devices.
• Amorphous Indium Gallium Zinc Oxide (IGZO) is a promising material for memory applications, but its performance stability needs improvement.

Purpose of the Study:

• To enhance the resistive switching performance and stability of amorphous IGZO memory devices.
• To investigate the effect of inserting a thin Hafnium Aluminum Oxide (HfAlO) layer on RS characteristics.

Main Methods:

• Fabrication of amorphous IGZO memory devices with and without a HfAlO insertion layer between the IGZO and Pt electrode.
• Characterization of device performance, including switching voltages, speeds, energy consumption, retention time, endurance, and uniformity.

Main Results:

• The device with the HfAlO insertion layer exhibited significantly improved RS performance compared to a typical metal-insulator-metal structure.
• Lower switching voltages, faster switching speeds, reduced energy consumption, and enhanced uniformity of switching voltage and resistance states were observed.
• The HfAlO-modified device demonstrated excellent retention (>10^4 s at 85 °C), high on/off ratio, and over 10^3 endurance cycles.

Conclusions:

• The insertion of a thin HfAlO layer effectively improves the performance stability of amorphous IGZO memory devices.
• Interface effects at the HfAlO/IGZO junction regulate the formation and rupture of conductive filaments, leading to enhanced device reliability.
• This approach offers a promising strategy for developing high-performance and stable ReRAM devices.