MEMS Device Fabrication via Segmented Assembly
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Solution Overview
Problem
Current MEMS device fabrication processes are inefficient and costly due to the combination of individual steps required to produce a single device, leading to high production costs and potential defects from individual component failures.
Innovation Solution
A MEMS device is fabricated using individual components processed through known procedures and assembled using simple bonding techniques, with a molded isotropically electrically conductive enclosure to encapsulate the MEMS die, allowing for efficient production and reduced costs by isolating defects in individual components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If individual MEMS device components are fabricated separately and assembled, then production efficiency is improved and costs are reduced, but device complexity increases due to multiple fabrication steps
Solution Approach 1:
The MEMS device is divided into separate components (MEMS die, enclosure, bonding layers) that are fabricated independently using standard IC processes, then assembled together. This segmentation allows each component to be manufactured using optimized individual processes rather than a single complex integrated process, improving production efficiency while managing complexity through modular assembly.
2Reliability
If multiple individual steps are combined to fabricate a single MEMS device, then device functionality is achieved, but production costs increase and defect risk increases
Solution Approach 1:
Individual MEMS components are fabricated and tested separately using established IC processes before final assembly. This preliminary fabrication and testing of discrete components allows for quality control at each stage, reducing the risk of defects propagating through the entire device while maintaining full device functionality through modular construction.
3Productivity
If individual MEMS components are processed separately, then defects are isolated and production efficiency improves, but manufacturing precision requirements increase
Solution Approach 1:
Each MEMS component is fabricated with specific local quality requirements optimized for its particular function using standard IC processes. The MEMS die, enclosure, and bonding layers are each manufactured with precision tailored to their specific needs rather than requiring uniform high precision across all components, enabling efficient separate production while maintaining overall device quality.
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 significantly improves production efficiency and reduces costs by allowing separate processing and assembly of MEMS device components, ensuring that defects in individual components do not impact the overall fabrication process and enabling efficient encapsulation to prevent external interference.
Implementation Method 1
removal of a silicon oxide sacrificial layer
Implementation Method 2
deposition of sacrificial and structural layers including silicon nitride, silicon oxide, and polysilicon layers
Data Source
Figure 1
Figure 2A
Figure 2B
AI summary
A MEMS device includes a chip carrier having an acoustic port extending from a first surface to a second surface of the chip carrier, a MEMS die disposed on the chip carrier to cover the acoustic port at the first surface of the chip carrier, and an enclosure bonded to the chip carrier and encapsulating the MEMS die.