A Large Voltage Responsivity Pyroelectric Sensor Based on Hot-Pressed Lead Zirconate Titanate Ceramic.

Area of Science:

• Materials Science
• Electrical Engineering
• Sensor Technology

Background:

• Pyroelectric sensors utilize materials that generate an electric charge in response to temperature changes.
• Lead zirconate titanate (PZT) ceramics are known for their pyroelectric properties, making them suitable for sensor applications.
• Sensor performance is often influenced by the physical dimensions of the sensitive element.

Purpose of the Study:

• To investigate the effect of PZT ceramic thickness on the performance of pyroelectric sensors.
• To fabricate and characterize current mode pyroelectric sensors with varying chip thicknesses.
• To determine the optimal thickness for enhanced sensor performance.

Main Methods:

• Hot-pressed PZT ceramics were fabricated into pyroelectric chips of 80 μm, 40 μm, and 30 μm thicknesses.
• Three current mode pyroelectric sensors were constructed using these chips.
• Voltage responsivity and specific detectivity were measured and analyzed to evaluate sensor performance.

Main Results:

• The voltage responsivity of the fabricated sensors reached the order of 10^5 V/W.
• A significant size effect was observed, with performance increasing as PZT chip thickness decreased.
• The sensor with a 30 μm thick PZT chip exhibited a specific detectivity of 5.3 × 10^8 cm·Hz^1/2/W at 10 Hz modulation frequency.

Conclusions:

• Reducing the thickness of PZT ceramic pyroelectric chips significantly enhances sensor performance.
• Thinner pyroelectric elements are crucial for achieving higher sensitivity and detectivity in current mode sensors.
• The findings provide valuable insights for the design of advanced pyroelectric sensing devices.