Vanadium Oxide Thermal Resistor With Stress Pattern for Higher TCR
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Vanadium oxide thermal resistance devices experience a decrease in temperature coefficient of resistance (TCR) characteristics when compressive stress is applied, which affects their performance in converting temperature changes into electrical signals.
Innovation Solution
A thermal resistance device with a stress control pattern made of a patterned metal material, such as Ti and V, is used under the vanadium oxide layer to provide tensile stress, improving the TCR characteristics. The device includes a silicon oxynitride layer, a vanadium oxide layer, and a support based on silicon, with a Peano curve structure for the stress control pattern to enhance tensile stress and resistivity changes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If compressive stress is applied to the vanadium oxide layer, then the device structure is stabilized, but the temperature coefficient of resistance (TCR) characteristics deteriorate
Solution Approach 1:
The patent applies preliminary anti-action by introducing a stress control pattern that generates tensile stress to counteract the compressive stress applied to the vanadium oxide layer. This pre-compenation approach prevents the deterioration of TCR characteristics before they can occur, allowing the device to maintain both structural stability and electrical performance
Solution Approach 2:
The patent changes the stress parameter from compressive to tensile by introducing a stress control pattern made of metal materials with different thermal expansion coefficients. This parameter change allows the vanadium oxide layer to experience tensile stress that compensates for and counteracts the harmful compressive stress, thereby improving TCR characteristics while maintaining device stability
2Reliability
If a stress control pattern is introduced to improve TCR characteristics, then the TCR increases to 2.7% or more, but the device structure becomes more complex
Solution Approach 1:
The patent applies segmentation by dividing the stress control function into a separate patterned layer rather than modifying the entire device structure. The stress control pattern is formed as a distinct metal layer with specific geometric patterns (such as mesh or grid patterns), allowing the TCR improvement function to be isolated and implemented without fundamentally redesigning the entire device architecture
Solution Approach 2:
The patent introduces an intermediary stress control pattern layer made of metal materials that acts as a mediator between the substrate and the vanadium oxide layer. This intermediary layer transfers tensile stress to the vanadium oxide layer to improve TCR characteristics without requiring direct modification of the vanadium oxide layer itself, thereby simplifying the overall implementation
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 implementation of the stress control pattern under the vanadium oxide layer increases the TCR to 2.7% or more, improving the device's ability to convert temperature changes into electrical signals effectively, while minimizing noise from Johnson noise.
Implementation Method 1
the stress control pattern formed under the vanadium oxide layer provides tensile stress to the vanadium oxide layer, thereby improving the temperature coefficient of resistance (TCR) characteristics of the thermal resistance device
Implementation Method 2
the resistor is required to have a large change in resistance with a small change in temperature
Implementation Method 3
The thermal resistance device uses a resistor that converts a temperature change into an electrical signal. The resistor is required to have a large change in resistance with a small change in temperature
Data Source
AI summary
A thermal resistance device having a vanadium oxide layer and a method of manufacturing the thermal resistance device are proposed. The device may include a stress control pattern that can improve temperature coefficient of resistance (TCR) characteristics. The thermal resistance device may include a support comprising silicon and having an opening formed in a center thereof, and a silicon oxynitride layer formed on the support to cover the opening. The thermal resistance device may also include the stress control pattern formed of a patterned metal material on the silicon oxynitride layer over the opening. The thermal resistance device may further include the vanadium oxide layer formed to cover the stress control pattern and receiving tensile stress from the stress control pattern.