Hybrid MEMS-ASIC Integration via Monolithic Cap Layering
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Solution Overview
Problem
The existing method for manufacturing hybrid integrated components with MEMS and ASIC substrates requires multiple starting substrates and complex bonding processes, leading to high material and processing costs, structural height, and increased complexity.
Innovation Solution
The method involves manufacturing the micromechanical structure and cap of the MEMS element in a layered structure from a shared semiconductor substrate, with the cap grown using thin-film technology, eliminating the need for separate bonding processes and reducing structural height, while allowing for integration of connecting lines and circuit elements within the cap structure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If three separate starting substrates are used for manufacturing MEMS element, cap, and ASIC substrate independently, then each component can be manufactured with high precision, but material and processing costs increase and device complexity increases
Solution Approach 1:
The patent merges the manufacturing of the cap and MEMS element into a single integrated process on one semiconductor substrate. The cap is formed as an integrated structure comprising multiple layers (first cap layer, second cap layer, and third cap layer) that are deposited and structured together with the MEMS element, eliminating the need for separate substrate preparation and bonding operations.
Solution Approach 2:
The semiconductor substrate serves multiple functions simultaneously: it acts as the base for both the MEMS element and the cap structure, provides mechanical support, and enables integrated fabrication of both components. This multi-functional substrate approach reduces the number of separate manufacturing steps and material requirements.
2Manufacturing precision
If three separate starting substrates are used for manufacturing MEMS element, cap, and ASIC substrate independently, then each component can be manufactured with high precision, but material and processing outlay increases
Solution Approach 1:
The patent combines the cap and MEMS element fabrication onto a single substrate, reducing material consumption by eliminating redundant substrate materials and reducing the total quantity of cap layers and structural materials required compared to three separate substrate approaches.
3Strength
If two independent bonding processes are carried out for component assembly, then robust connections are achieved, but processing time and complexity increase
Solution Approach 1:
The patent eliminates the need for separate bonding processes by integrating the cap structure directly onto the MEMS element during the same fabrication sequence. The cap layers are deposited and structured in continuity with the MEMS element formation, achieving strong mechanical integration without additional bonding steps.
4Reliability
If traditional manufacturing method with three substrates is used, then component functionality is achieved, but structural height increases
Solution Approach 1:
The patent implements a nested structure where the MEMS element is embedded within and supported by the multi-layer cap structure. The first cap layer forms a base, the MEMS element is integrated within, and the second and third cap layers provide upper containment, creating a compact nested arrangement that minimizes overall structural height while maintaining full functionality.
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 enables cost-effective miniaturization of hybrid integrated components with reduced structural height and complexity, enabling reliable electrical and mechanical connections without additional bonding processes, suitable for manufacturing inertial sensors and other components.
Implementation Method 1
at least one cap layer is applied to a first surface of the semiconductor substrate in thin-film technology
Data Source
AI summary
A simple and cost-effective manufacturing method for hybrid integrated components including at least one MEMS element, a cap for the micromechanical structure of the MEMS element, and at least one ASIC substrate, using which a high degree of miniaturization may be achieved. The micromechanical structure of the MEMS element and the cap are manufactured in a layered structure, proceeding from a shared semiconductor substrate, by applying at least one cap layer to a first surface of the semiconductor substrate, and by processing and structuring the semiconductor substrate proceeding from its other second surface, to produce and expose the micromechanical MEMS structure. The semiconductor substrate is then mounted with the MEMS-structured second surface on the ASIC substrate.