MEMS Component Lateral Electrical Contacts
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Solution Overview
Problem
Existing methods for producing micro-mechanical and micro-opto-electro-mechanical components face challenges in creating reliable electrical contacts, especially with high aspect ratios, which can lead to reduced connection quality and increased material costs due to difficulties in filling conductive materials and adhering covers to other layers.
Innovation Solution
A method involving the creation of a first layer composite with trenches filled with insulating material, allowing for electrical insulation and the formation of conductive regions, followed by the integration of a structure layer and a cover layer to establish conductive paths, ensuring hermetic sealing and efficient electrical connections.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If vertical through connections with high aspect ratios are used for electrical contacts, then electrical contact can be achieved, but realization and durability difficulties arise
Solution Approach 1:
The patent transitions from vertical through-connections (high aspect ratio) to lateral surface contacts (low aspect ratio). Electrical contacts are established through lateral surfaces of the substrate rather than penetrating deep vertical holes, fundamentally changing the dimensional approach from depth-oriented to surface-oriented contact geometry.
Solution Approach 2:
Instead of leading contacts vertically through the substrate from one surface to the other, the patent inverts the approach by establishing contacts laterally on the surface. The conductive paths are formed on the lateral surface rather than through the thickness, reversing the conventional contact geometry.
2Reliability
If conductive material filling is used for high aspect ratio openings, then electrical contact can be created, but material expense and processing complexity increase
Solution Approach 1:
The patent extracts the requirement for deep conductive material filling by eliminating high aspect ratio openings. Contacts are formed through lateral surface connections that do not require filling deep vertical holes, removing the need for complex filling processes and reducing material consumption.
Solution Approach 2:
The patent employs simpler, more cost-effective conductive materials and processes for lateral surface contacts rather than expensive fill materials required for deep vertical holes. The contact structure uses readily available conductive layers formed through standard deposition techniques.
3Reliability
If openings are created prior to joining process, then electrical contacts can be established, but joining area is reduced and connection quality decreases
Solution Approach 1:
The patent segments the contact formation process from the joining process. Electrical contacts are formed on lateral surfaces in separate processing steps before or after joining, rather than requiring pre-formed openings that compromise the joining area. This allows independent optimization of both contact formation and hermetic sealing.
Solution Approach 2:
The patent moves contact formation to the lateral surface dimension rather than requiring openings in the joining plane. Contacts are established on the side surfaces of the substrate, separating the contact geometry from the joining interface and preserving the full joining area for hermetic sealing.
Data Source
AI summary
A component is produced by creating a first layer composite that includes a first electrically conductive substrate and having a trench filled with an insulating material by creating a second layer composite that includes the first layer composite and a structure layer. The structure layer includes an active structure and is electrically conductive at least in a first region that adjoins a first surface of the first substrate and includes in the first region of the first substrate a first electrically conductive contact face on a second surface of the first substrate, which is located opposite the first surface. The first region of the first substrate is electrically insulated laterally from other regions of the first substrate by the trench.