Ultrahigh-speed absolute temperature sensing using ferroelectric HfO₂ enabled by transient negative differential...

Area of Science:

• Materials Science
• Nanoscience
• Electrical Engineering

Background:

• Conventional pyroelectric sensors struggle with slow response times and limited integration with nanoelectronics.
• Existing ferroelectric sensors face challenges in operating under constant temperature conditions and broad application adaptability.

Purpose of the Study:

• To develop a high-accuracy, high-speed ferroelectric-based pyroelectric sensor for absolute temperature measurement.
• To overcome the limitations of conventional temperature sensing technologies.

Main Methods:

• Utilized ferroelectric hafnium zirconium oxide (HZO) nanolaminates.
• Applied a perturbation pulse (+0.8 V, 180 ns duration) to probe temperature-dependent properties.
• Integrated the sensor with a universal serial bus (USB) interface for real-time monitoring.

Main Results:

• Achieved an ultrafast response time of approximately 50 nanoseconds, enabling one million readings per second.
• Demonstrated temperature sensing accuracy comparable to state-of-the-art methods (1.0 K).
• Observed performance linked to temperature-dependent transient negative differential capacitance and effective ferroelectric polarization in HZO.

Conclusions:

• The developed HZO-based pyroelectric sensor offers a significant advancement for both steady-state and dynamic temperature measurements.
• This methodology expands the application scope of pyroelectric sensors in various fields.
• The sensor's high speed, accuracy, and integration capabilities pave the way for next-generation temperature monitoring solutions.