Semiconductor Module Panel Bonding for MEMS Sensitivity
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Solution Overview
Problem
The manufacturing costs of semiconductor devices such as microphones, pressure sensors, and other MEMS devices are high due to complex and inefficient fabrication methods, limiting the increase of back volume which affects sensitivity and signal-to-noise ratio.
Innovation Solution
A method involving the fabrication of a semiconductor panel with multiple devices, a cap panel with multiple caps, and bonding these to form semiconductor modules, using molding techniques like compression molding and singulation to reduce costs and enhance device performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the back volume is increased to improve microphone sensitivity and frequency response, then the sensitivity and frequency response are improved, but the device complexity and manufacturing difficulty increase
Solution Approach 1:
The manufacturing process is segmented into multiple stages: forming individual cavities in a panel, bonding the panel to a carrier with semiconductor devices, and then selectively removing panel material to create the back volume. This segmentation allows complex 3D cavity structures to be formed through simpler sequential operations rather than attempting to form the complete back volume in a single step.
Solution Approach 2:
The cavity structure is prepared in advance by forming recesses in the panel before bonding to the semiconductor devices. This preliminary action allows the back volume space to be pre-configured, and subsequent material removal creates the final back volume shape without complicating the primary bonding process.
2Ease of manufacture
If conventional manufacturing methods are used for cap and back volume structures, then the manufacturing process is simpler, but the manufacturing costs increase and sensitivity improves less
Solution Approach 1:
Multiple manufacturing operations are merged into integrated process steps. The cavity formation, panel bonding, and back volume creation are combined into a coordinated sequence that can be performed in a single manufacturing campaign, reducing the need for separate processing steps and improving overall manufacturing efficiency.
Solution Approach 2:
The panel structure serves multiple functions: it provides the mechanical support for the cavity, acts as the bonding interface to the semiconductor devices, and serves as the material source for creating the back volume through selective removal. This multi-functionality reduces the need for additional components and simplifies the overall manufacturing process.
3Adaptability or versatility
If individual cap and back volume components are manufactured separately and assembled, then the manufacturing flexibility is higher, but the manufacturing costs increase
Solution Approach 1:
The manufacturing approach merges the production of the cap, back volume, and semiconductor device assembly into a single integrated process. The panel is formed with cavities, bonded to the semiconductor devices, and then processed to create back volumes all in one manufacturing campaign, eliminating the need for separate manufacturing and assembly steps for each component.
Solution Approach 2:
The panel is prepared in advance with pre-formed cavities and bonding surfaces before the semiconductor devices are attached. This preliminary preparation allows for efficient batch processing and reduces the complexity of subsequent assembly operations, achieving cost effectiveness through standardized pre-processing.
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 reduces manufacturing costs and enhances the sensitivity and frequency response of semiconductor modules by efficiently bonding cap panels onto semiconductor panels, allowing for better integration and performance of MEMS devices.
Implementation Method 1
bonding the cap panel onto the semiconductor panel so that each one of the caps covers one or more of the semiconductor devices
Data Source
AI summary
The method comprises fabricating a semiconductor panel comprising a plurality of semiconductor devices, fabricating a cap panel comprising a plurality of caps, bonding the cap panel onto the semiconductor panel so that each one of the caps covers one or more of the semiconductor devices, and singulating the bonded panels into a plurality of semiconductor modules.