MEMS Gas Sensor Membrane Structure for Low-Power Partial Heating
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Solution Overview
Problem
Conventional semiconductor-type gas sensors exhibit high power consumption due to bulk heating methods, making them unsuitable for IoT and wearable applications, and there is a need for a low-power alternative that can be mass-produced using MEMS technology.
Innovation Solution
A MEMS gas sensor design featuring a substrate with a recess, a membrane with through-holes, and multiple sensing layers, including a lower, middle, and upper sensing layers, supported by insulation layers and a heater layer, which allows for partial heating and reduced power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by stationary object
If bulk heating method is used in conventional gas sensor, then heating capability is sufficient, but power consumption becomes several hundred mW
Solution Approach 1:
The substrate is divided into two regions: a heated region where the heater is located and a non-heated region that remains at ambient temperature. This segmentation allows only the necessary portion to be heated, reducing power consumption from several hundred mW to less than 100 mW while maintaining effective gas sensing in the heated zone.
Solution Approach 2:
The heater is designed to provide localized heating to specific regions of the substrate and sensing layers, rather than uniform bulk heating. This local quality approach ensures that only the areas requiring thermal activation for gas sensing are heated, minimizing energy waste and reducing overall power consumption.
2Power
If entire substrate heating method is used, then uniform temperature distribution is achieved, but heater size becomes large and power consumption increases
Solution Approach 1:
The heating function is segmented to operate only in specific regions rather than across the entire substrate. The heater is positioned to heat only the necessary portions of the sensing layers, reducing both the heater area and power consumption while maintaining effective sensing performance in the heated zones.
Solution Approach 2:
Instead of heating the entire substrate uniformly, only partial regions are heated to the required temperature. This partial action approach reduces the heater size and power consumption by avoiding unnecessary heating of areas that do not require thermal activation for gas sensing.
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 MEMS gas sensor achieves low-power operation by minimizing heater size and heat loss, enabling integration into IoT and wearable devices through a CMOS-compatible process.
Implementation Method 1
a heater layer disposed on the middle insulation layer
Implementation Method 2
a membrane disposed in the recess and having a through-hole configured to expose a portion of a top surface of the substrate
Data Source
AI summary
Disclosed are a MEMS gas sensor and a manufacturing method thereof. The MEMS gas sensor includes a substrate having a recess, a membrane disposed in the recess and having a through-hole configured to expose a portion of a top surface of the substrate, which is disposed at a central portion of the recess, sensing electrodes disposed in the membrane, and a sensing layer disposed on each of bottom and top surfaces of the membrane and disposed in the through-hole.