Monolithic MEMS Proof-Mass Integration on Semiconductor Layer
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Solution Overview
Problem
Existing MEMS devices face inefficiencies and high costs due to the need for multiple steps in fabrication and limited electromechanical integration, with separate semiconductor layers required for circuitry and proof-mass structures, leading to increased manufacturing and packaging costs.
Innovation Solution
A monolithic MEMS device is fabricated where the proof-mass, support structure, and electrodes are integrated within the same semiconductor layers as the drive/sense circuitry, allowing for movement in multiple directions without additional deposited layers, enhancing electrical-mechanical integration and reducing parasitic capacitance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If separate semiconductor layers are used for circuitry and proof-mass structures, then fabrication process is simplified, but manufacturing and packaging costs increase and electromechanical integration is limited
Solution Approach 1:
The patent merges the circuitry and proof-mass structures into a single integrated semiconductor layer, eliminating the need for separate layers. This integration allows the proof-mass, support structures, and circuitry to be fabricated simultaneously in the same manufacturing process, reducing both fabrication steps and packaging complexity while improving electromechanical integration.
2Manufacturing precision
If multiple fabrication steps are used for proof-mass and circuitry, then structural precision is improved, but manufacturing cost and time increase
Solution Approach 1:
The patent performs preliminary integration by designing and fabricating both the proof-mass structures and circuitry in the same semiconductor layer during the same manufacturing process. This preliminary action eliminates subsequent packaging steps and reduces overall manufacturing time while maintaining structural precision through single-step fabrication.
3Device complexity
If additional deposited layers are added for integration, then electromechanical coupling is improved, but device complexity and manufacturing cost increase
Solution Approach 1:
The patent combines the proof-mass, support structures, and circuitry into a single integrated semiconductor layer, eliminating the need for additional deposited layers. This merging approach achieves high electromechanical integration while reducing manufacturing complexity by using a single fabrication process for all components.
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
This approach reduces manufacturing and packaging costs while improving performance by tightly coupling electromechanical interfaces, enabling more reliable and cost-effective MEMS devices for applications like multi-axis sensors and optical switches.
Implementation Method 1
the proof-mass moves in response to an applied force or acceleration
Implementation Method 2
When an electrostatic potential is applied to the at least one top and bottom electrodes, an electrostatic force is generated which causes the proof-mass to move
Data Source
AI summary
Provided is a micro-electromechanical-system (MEMS) device including a substrate; at least one semiconductor layer provided on the substrate; a circuit region including at least one chip containing drive/sense circuitry, the circuit region provided on the at least one semiconductor layer; a support structure attached to the substrate; at least one elastic device attached to the support structure; a proof-mass suspended by the at least one elastic device and free to move in at least one of the x-, y-, and z-directions; at least one top electrode provided on the at least one elastic device; and at least one bottom electrode located beneath the at least one elastic device such that an initial capacitance is generated between the at least one top and bottom electrodes, wherein the drive/sense circuitry, proof-mass, supporting structure, and the at least one top and bottom electrodes are fabricated on the at least one semiconductor layer.