A single-phase epitaxially grown ferroelectric perovskite nitride

Area of Science:

• Materials Science
• Solid-State Physics
• Solid-State Chemistry

Background:

• Integration of ferroelectric materials with semiconductors is key for advanced electronic devices like transistors and memory.
• Limited synthesis of high-quality single-crystalline ferroelectric nitride perovskites has hindered research into their switching dynamics.

Purpose of the Study:

• To synthesize and characterize epitaxial single-phase ferroelectric cerium tantalum nitride (CeTaN₃) on various substrates.
• To confirm the polar symmetry and ferroelectric properties of CeTaN₃.

Main Methods:

• Epitaxial growth of cerium tantalum nitride (CeTaN₃) on oxide and semiconductor substrates.
• Characterization using techniques such as optical second harmonic generation and piezoresponse force microscopy.
• Analysis of atomic displacement and polarization-electric field hysteresis loops.

Main Results:

• Successful synthesis of epitaxial single-phase ferroelectric CeTaN₃.
• Confirmation of polar symmetry through atomic displacement and optical second harmonic generation.
• Observation of switchable ferroelectric domains and square-like polarization-electric field hysteresis loops with a remanent polarization of ~20 μC/cm² at room temperature.

Conclusions:

• CeTaN₃ exhibits robust ferroelectric properties, making it a promising material for functional devices.
• This research bridges the gap between ferroelectric nitride perovskites and practical applications.
• Paves the way for next-generation information and energy storage devices.