Microbolometer VOx Manufacturing Process Stabilization
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Solution Overview
Problem
Microbolometers using vanadium oxide as sensitive material face degradation in electrical properties during manufacturing, leading to increased noise in 1/f, which affects their performance in detecting electromagnetic radiation.
Innovation Solution
A method of manufacturing microbolometers with a sensitive material comprising vanadium oxide and additional chemical elements like boron or carbon, involving thermal exposure to preserve electrical properties, where the material is formed into a thin layer and exposed to a temperature higher than ambient, resulting in an electrical resistivity at least 50% of its native value.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If vanadium oxide-based sensitive material is used in microbolometer manufacturing, then the material provides good compatibility with conventional deposition and etching steps, but the electrical properties of the material degrade during the manufacturing process
Solution Approach 1:
The patent modifies the chemical composition parameters of the vanadium oxide material by adding specific elements (tungsten, molybdenum, niobium, tantalum, or silicon) to create a composite material that maintains compatibility with conventional manufacturing processes while improving thermal stability and preserving electrical properties during fabrication
Solution Approach 2:
The patent creates a composite sensitive material by combining vanadium oxide with other metal oxides or elements, forming a multi-component system that leverages the beneficial properties of each component: vanadium oxide provides manufacturing compatibility while the added elements provide thermal stability and electrical property preservation
2Productivity
If the sensitive material is exposed to high temperature during manufacturing, then the manufacturing process can be completed, but the electrical resistivity of the material decreases significantly (to less than 50% of native value)
Solution Approach 1:
The patent adds stabilizing elements (tungsten, molybdenum, niobium, tantalum, or silicon) to the vanadium oxide material before the manufacturing process, creating a buffer that prevents excessive resistivity changes during thermal exposure, thereby cushioning against the harmful effects of temperature-induced resistivity degradation
3Stability of the object's composition
If additional chemical elements are added to improve thermal stability, then the electrical resistivity is better preserved, but the chemical composition becomes more complex
Solution Approach 1:
The patent introduces specific stabilizing elements at controlled concentrations (0.1-5 atomic percent) into the vanadium oxide lattice, creating localized regions of enhanced thermal stability without fundamentally altering the overall material structure or composition complexity, thus maintaining manufacturability while improving performance
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 method effectively limits or eliminates the degradation of noise in 1/f, enhancing the thermal stability and maintaining the electrical properties of the sensitive material, thereby improving the performance of microbolometers in detecting electromagnetic radiation.
Implementation Method 1
each microbolometer having an absorbing portion capable of absorbing the electromagnetic radiation to be detected
Implementation Method 2
The absorbing membrane comprises a sensitive material whose electrical resistivity ρ varies with the material's temperature
Implementation Method 3
These anchoring pillars and thermal insulation arms also serve an electrical function by electrically connecting the suspended membranes to a readout circuit
Data Source
Figure 1A~1B
Figure 2A~2C
Figure 3A~3B
AI summary
The invention relates to a process for manufacturing a microbolometer (10) comprising a vanadium oxide (VOx)-based sensitive material (15) that contains an additional chemical element selected from among boron (B) and carbon (C), excluding nitrogen (N), said process involving the following steps: i. determining an efficient non-zero amount of the additional chemical element (B, C) from which the sensitive material (15), after having been subjected to a temperature Tr for a time period Δtr, has an electric resistivity ρa|r, at ambient temperature, amounting to at least 50% of the intrinsic value ρa of the sensitive material (15); ii. creating a thin layer of the sensitive material (15) containing an amount of the additional chemical element (B, C) that is at least equal to the previously determined efficient amount thereof, the sensitive material being amorphous and having an electric resistivity of 1 to 30 Ω.cm; iii. subjecting the sensitive material (15) to a temperature of no more than Tr for a time period of no more than Δtr.