MEMS Membrane Reinforcement for Sensitivity and Robustness
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Solution Overview
Problem
MEMS devices face challenges in achieving both high sensitivity to detect low signal levels and robustness against excessive forces, such as drops or pressure bursts, due to the need for a balance between membrane flexibility and durability.
Innovation Solution
The MEMS device incorporates a reinforcement region with a larger thickness than adjoining regions, mechanically coupled to a deflectable membrane structure, and an electrode structure vertically spaced apart, using methods like LOCOS to enhance robustness while maintaining sensitivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the membrane is made thinner to increase flexibility and sensitivity, then the sensitivity to detect low signal levels is improved, but the robustness against excessive forces deteriorates
Solution Approach 1:
The membrane is designed with non-uniform thickness distribution, featuring a thinner central region for high sensitivity and flexibility, and a thicker border region for enhanced mechanical strength and robustness. This local variation in thickness allows each region to fulfill its specific functional requirement simultaneously.
Solution Approach 2:
The membrane structure combines regions of different thicknesses within a single continuous membrane, creating a composite structure that integrates both flexible and robust characteristics. The transition between different thickness regions is achieved through controlled deposition or etching processes.
2Strength
If the membrane is made thicker to increase robustness, then the robustness against excessive forces is improved, but the flexibility and sensitivity deteriorate
Solution Approach 1:
The membrane is designed with non-uniform thickness distribution, featuring a thinner central region for high sensitivity and flexibility, and a thicker border region for enhanced mechanical strength and robustness. This local variation in thickness allows each region to fulfill its specific functional requirement simultaneously.
3Measurement precision
If the membrane is made more flexible to detect low signal levels, then the sensitivity is improved, but the durability against excessive forces deteriorates
Solution Approach 1:
The membrane is designed with non-uniform thickness distribution, featuring a thinner central region for high sensitivity and flexibility, and a thicker border region for enhanced mechanical strength and robustness. This local variation in thickness allows each region to fulfill its specific functional requirement simultaneously.
Solution Approach 2:
The membrane structure combines regions of different thicknesses within a single continuous membrane, creating a composite structure that integrates both flexible and robust characteristics. The transition between different thickness regions is achieved through controlled deposition or etching processes.
4Reliability
If the membrane is made more robust to withstand excessive forces, then the durability is improved, but the flexibility and sensitivity deteriorate
Solution Approach 1:
The membrane is designed with non-uniform thickness distribution, featuring a thinner central region for high sensitivity and flexibility, and a thicker border region for enhanced mechanical strength and robustness. This local variation in thickness allows each region to fulfill its specific functional requirement simultaneously.
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 solution provides a MEMS device with improved robustness against mechanical stress while maintaining high sensitivity by distributing stress uniformly, preventing damage during operation, overload, or misuse conditions.
Implementation Method 1
manufacturing the reinforcement region of the first membrane structure using a local-Oxidation-of-Silicon, LOCOS
Data Source
Figure 1
Figure 2a
Figure 2b
AI summary
A MEMS device comprises a first membrane structure having a reinforcement region formed from one piece of the first membrane structure, wherein the reinforcement region has a larger layer thickness than an adjoining region of the first membrane structure. The MEMS device comprises an electrode structure, wherein the electrode structure is vertically spaced apart from the first membrane structure.