Transferable Highly Crystalline Perovskite Ferroelectrics for Low-Power Memory

Area of Science:

• Materials Science
• Solid State Physics
• Device Engineering

Background:

• Data-centric applications require energy-efficient and compact memory.
• Ferroelectric field-effect transistors (FeFETs) offer potential but face material limitations.
• Developing compatible ferroelectric materials with low switching energy is crucial.

Purpose of the Study:

• To investigate the integration of transferable bismuth ferrite (BiFeO3) with two-dimensional materials for low-power FeFETs.
• To characterize the ferroelectric properties of BiFeO3 films and their performance in FeFET devices.
• To demonstrate a compact, all-FeFET computing system for pattern classification.

Main Methods:

• Transfer of high-quality perovskite ferroelectric BiFeO3 films.
• Fabrication of metal-ferroelectric-semiconductor (MFS) and metal-ferroelectric-metal-insulator-semiconductor (MFMIS) FeFET structures.
• Integration with molybdenum disulfide (MoS2) to form high-quality interfaces.
• Device characterization and performance evaluation for memory and computing applications.

Main Results:

• Transferred BiFeO3 films exhibited a low coercive field (30 kV/cm) and leakage current (<10^-5 A/cm^2), yielding a switching energy of 0.05 J/cm^3.
• MFS and MFMIS FeFETs demonstrated low power consumption (1.5 fJ/bit/μm^2 and 11.2 fJ/bit/μm^2, respectively).
• A functional all-FeFET computing system for pattern classification was successfully constructed.

Conclusions:

• Transferable high-quality BiFeO3 is a viable material for low-power FeFETs.
• The developed FeFETs enable efficient volatile and nonvolatile memory operations.
• This work highlights the potential of BiFeO3-based FeFETs for future low-power memory and computing systems.