Encapsulation Module Semiconductor Electrodes Stability
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Solution Overview
Problem
Existing micromechanical arrangements face issues with long-term stability due to material compatibility problems, such as high temperature gradients, electromotive forces, electromigration, and corrosion, particularly when using different metals and silicon materials.
Innovation Solution
A method for producing an encapsulation module with semiconductor electrodes made of electrically conductive semiconductor material embedded in a non-conductive embedding material, eliminating the need for metal electrodes and enhancing stability by using wafer bonding and selective structuring processes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If metal electrodes are used for electrically reliable transition connections between silicon and metal electrode, then electrical reliability is improved, but long-term stability deteriorates due to corrosion, electromigration and battery effects
Solution Approach 1:
The patent introduces an intermediate semiconductor layer (heavily doped silicon or silicon-germanium) between the metal electrode and the silicon substrate. This intermediary layer acts as a buffer that prevents direct contact between incompatible materials, thereby eliminating corrosion, electromigration, and battery effects while maintaining electrical conductivity. The intermediate layer has properties that are compatible with both the metal electrode and the silicon substrate, resolving the material compatibility issue.
Solution Approach 2:
The patent changes the material parameter from metal to heavily doped semiconductor material for the electrode layer. By adjusting the doping concentration and material composition (silicon or silicon-germanium), the electrical and mechanical properties are optimized to match both the metal interconnect and the silicon substrate, thereby improving long-term stability while maintaining electrical reliability.
2Ease of manufacture
If different metals and silicon materials are contacted, then electrical connections are achieved, but temperature gradient increases leading to poor long-term stability
Solution Approach 1:
The patent uses heavily doped silicon or silicon-germanium as the electrode material, which has thermal expansion and conductivity properties similar to the silicon substrate. This homogeneity in material properties minimizes temperature gradients and thermal stress at interfaces, thereby improving long-term stability while maintaining ease of manufacturing through standard semiconductor processing techniques.
3Reliability
If through contacts are incorporated into planar substrate, then electrical connectivity is improved, but manufacturing complexity increases
Solution Approach 1:
The patent segments the electrode structure into multiple layers: a metal interconnect layer, a heavily doped semiconductor intermediate layer, and the silicon substrate. This segmentation allows each layer to be optimized independently using standard semiconductor processing techniques, thereby improving electrical connectivity while managing manufacturing complexity through modular fabrication steps.
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 flexible and reliable encapsulation module suitable for inertial sensors, allowing for precise integration of various components without wiring, with improved long-term stability and reduced parasitic effects.
Implementation Method 1
The electrically conductive semiconductor material is highly doped
Data Source
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AI summary
The invention relates to a method for producing an encapsulation module (A) and/or for encapsulating a micromechanical arrangement, wherein electronic connection means, such as through contacts (2), electrical lines, contacts and/or electronic structures are produced from a blank (1) of electrically conducting semiconductor material, in particular, doped silicon, by means of one or more structuring processes and/or etching processes, wherein in the process of the formation of the electronic connector means, a plinth (6) of the semiconductor material is generated on which the electronic connector means are arranged, subsequently being embedded in an embedding material (9) and the embedding material and/or the semiconductor plinth (6) are removed after the embedding to the extent that a defined number of the electronic connector means have electrical contact on at least one of the outer surfaces (7, 8) of the encapsulation module (A) and during the process of the formation of the electronic connector means with the at least one structuring and/or etching process at least one isolated material mound on each of which a through contact (2) is arranged, are formed on the plinth of the semiconductor material (6), which forms a semiconductor electrode (3). The invention further relates to an encapsulation module and/or a micromechanical arrangement with at least one through contact (2) and at least one semiconductor electrode (3) and the use thereof in motor vehicles.