Tetragonal Pb-Nb-Ti Pyroelectric Film for High Sensitivity
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Solution Overview
Problem
Current pyroelectric sensors and thermoelectric conversion elements face challenges in achieving high sensitivity, particularly due to limitations in the pyroelectric coefficient and electrostatic capacitance, which affect their performance in detecting temperature changes and infrared radiation.
Innovation Solution
A thermoelectric conversion element is developed using a composite oxide with a tetragonal crystal structure oriented in the {100} direction, comprising Pb, Nb, and Ti, forming a nano-domain with a specific composition and crystallite diameter, which enhances the pyroelectric coefficient and sensitivity, while maintaining lower electrostatic capacitance compared to traditional lead zirconate titanate (PZT) materials.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional PZT material is used as pyroelectric material, then a relatively large pyroelectric coefficient can be obtained, but the electrostatic capacitance is high which reduces sensitivity
Solution Approach 1:
The patent changes the crystal structure parameter from rhombohedral (PZT) to tetragonal, and controls the crystallite diameter to be 10 nm or less. This parameter change in crystal structure and size reduces the electrostatic capacitance while maintaining or improving the pyroelectric coefficient, thereby increasing sensitivity according to the relationship ΔV=ΔQ/C
Solution Approach 2:
The patent uses a composite oxide material with specific composition (Pb, Nb, Ti) that forms a tetragonal crystal structure. This composite material approach allows optimization of both pyroelectric properties and capacitance characteristics, achieving higher sensitivity compared to traditional single-phase PZT materials
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The improved pyroelectric coefficient and reduced electrostatic capacitance result in increased sensitivity and detection efficiency for temperature changes and infrared radiation, enabling more effective operation of pyroelectric sensors and thermoelectric conversion elements.
Implementation Method 1
The thermoelectric conversion element has properties (pyroelectric effect) which cause temperature change by absorbing infrared thermal energy such that an electrical charge is generated in response to the temperature change
Data Source
AI summary
A thermoelectric conversion element includes a first electrode on provided a substrate; a pyroelectric film that is provided on the first electrode, is formed of a composite oxide having an ABO3-type perovskite structure, and generates a surface charge due to temperature change; and a second electrode provided on the pyroelectric film, in which the composite oxide which forms at least a portion of layer in the pyroelectric film contains at least Pb, Nb, and Ti, and is formed of tetragonal crystal which is oriented in the direction of {100} on the substrate.