Facet-Engineered Atomic Interface and On-Chip Continuous-Amplitude Modulated Recovery Enabling Ultra-High Endurance...

Area of Science:

• Materials Science
• Solid State Physics
• Electrical Engineering

Background:

• Ferroelectric hafnia-based materials are crucial for next-generation nonvolatile memories and beyond-Moore computing.
• Device fatigue, caused by interfacial charge injection and oxygen vacancies, limits the resilience of these materials under repeated electrical cycling.

Purpose of the Study:

• To develop a comprehensive strategy for mitigating fatigue in hafnium zirconate (Hf_0.5Zr_0.5O₂) memory arrays.
• To enhance the endurance and reliability of ferroelectric memory devices through synergistic material and circuit design.

Main Methods:

• Engineered titanium nitride (TiN) electrodes with preferential {111} facet orientation and controlled surface oxidation.
• Integrated on-chip continuous-amplitude modulated recovery (CAMR) circuit design for oxygen vacancy redistribution.
• Fabrication and characterization of ferroelectric memory capacitors utilizing the combined approach.

Main Results:

• The facet-engineered TiN electrodes effectively inhibited interfacial charge injection and polarization pinning.
• The synergistic design resulted in ferroelectric capacitors with high residual polarization (2P_r = 52 μC/cm²) and negligible wake-up effects.
• Devices demonstrated ultra-high endurance exceeding 10¹³ cycles, indicating excellent sustainability and reliability.

Conclusions:

• The combination of facet-engineered electrodes and CAMR provides a robust solution to ferroelectric fatigue in Hf_0.5Zr_0.5O₂ memory arrays.
• This synergistic design enables a viable pathway for the large-scale integration and application of hafnium-based ferroelectric nonvolatile memories.
• The study highlights the importance of interfacial engineering and circuit co-design for advancing high-performance memory technologies.