MEMS Support Device Interposer Thermal Expansion Gradient
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Solution Overview
Problem
MEMS components face mechanical instability and distortion due to thermal stresses caused by mismatched coefficients of thermal expansion between the support substrate and the base component, leading to weakened integrally bonded connections and impaired device quality.
Innovation Solution
Incorporating an interposer with a lower coefficient of thermal expansion than the base component and matching or exceeding that of the support substrate, allowing for reduced thermal stresses and more advantageous design of integrally bonded connections, thereby enhancing mechanical stability and avoiding distortion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an interposer with matched coefficient of thermal expansion is introduced between the base component and support substrate, then thermal stresses are reduced and mechanical stability is improved, but device complexity increases due to additional components and bonding interfaces
Solution Approach 1:
An interposer component is introduced as an intermediary element between the base component and support substrate. This interposer has a coefficient of thermal expansion α2 that satisfies α1>α2≥α3, positioning it as a thermal expansion mediator that reduces the overall thermal stress in the assembly while providing a stable bonding interface for both the base component and support substrate.
Solution Approach 2:
The device employs a composite structure consisting of three different materials with specifically selected thermal expansion properties. The base component (material 1), interposer (material 2), and support substrate (material 3) form a composite assembly where each material's thermal expansion coefficient is carefully chosen to create a gradient that mitigates thermal stresses while maintaining structural integrity.
2Strength
If integrally bonded connections are used to couple the base component and support substrate, then mechanical strength is improved, but thermal stresses worsen due to mismatched coefficients of thermal expansion
Solution Approach 1:
The interposer serves as a thermal expansion mediator between the base component and support substrate, allowing integrally bonded connections to maintain their strength while reducing thermal stress transmission. The interposer's intermediate coefficient of thermal expansion (α2) creates a gradient that protects the rigid integrally bonded interfaces from excessive thermal stresses.
Solution Approach 2:
The invention changes the thermal expansion parameter distribution in the assembly by selecting materials with specific coefficients of thermal expansion. The condition α1>α2≥α3 creates an optimized parameter gradient that reduces thermal stress while maintaining the strength benefits of integrally bonded connections.
3Device complexity
If the support substrate is directly coupled to the base component, then device complexity is reduced, but manufacturing precision worsens due to thermal-induced distortion and impaired co-planarity
Solution Approach 1:
The interposer acts as a stable intermediary platform that provides a thermally stable bonding interface between the base component and support substrate. This mediator protects the mirror element array from thermal-induced distortion, maintaining manufacturing precision and co-planarity while the interposer absorbs differential thermal expansion.
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 use of an interposer with a matching or lower coefficient of thermal expansion reduces thermal stresses, enabling more stable and geometrically advantageous connections, improving the mechanical stability and reducing thermal-induced distortion of MEMS components, particularly in micro-mirror arrays, ensuring optimal co-planarity and device quality.
Implementation Method 1
a base component, which substantially consists of a first material with a first coefficient of thermal expansion α1, an interposer, which is integrally bonded to the base component and substantially consists of a second material with a second coefficient of thermal expansion α2, and a support substrate, which is integrally bonded to the interposer and substantially consists of a third material with a third coefficient of thermal expansion α3
Data Source
AI summary
The invention relates to a device (100) for supporting one or more MEMS components (160), comprising a base component (110), which substantially consists of a first material with a first coefficient of expansion α1, an interposer (120), which is integrally bonded to the base component (110) in one or more first connection regions (140) and substantially consists of a second material with a second coefficient of expansion α2, and a support substrate (130), which is integrally bonded to the interposer (120) in one or more second connection regions (150) and substantially consists of a third material with a third coefficient of expansion α3, wherein the support substrate (130) is configured to support the one or more MEMS components (160), and for the coefficients of expansion the following holds true: α1>α2≥α3, preferably α1>α2=α3. The invention also relates to a system (105) comprising a device (100) according to the invention and the one or more MEMS components (160), and to a method for producing a device (100) according to the invention.