MEMS Devices Integrated Circuit Manufacturing Process
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Solution Overview
Problem
The integration of different MEMS devices into a single integrated circuit manufacturing process poses unique challenges, particularly in electrically interconnecting them effectively.
Innovation Solution
A method for manufacturing MEMS devices, such as pressure sensors and accelerometers, on a single chip using a shared integrated circuit (IC) process, involving the formation of metallization layers, dielectric layers, seed layers, and conductive materials, along with bonding and etching processes to create cavities and through vias for electrical connections, allowing for the smooth integration of multiple MEMS devices on a single chip.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If different MEMS devices are integrated into a single IC manufacturing process, then manufacturing cost and device size are reduced, but electrical interconnection complexity increases
Solution Approach 1:
The patent segments the electrical interconnection process into distinct stages: forming conductive plugs in through-vias, forming separate conductive traces on different layers, and establishing connections through dielectric layers. This segmentation allows each interconnection element to be independently formed and controlled, managing the overall complexity of integrating multiple MEMS devices.
Solution Approach 2:
The patent utilizes three-dimensional positioning and multi-layer construction to establish electrical connections. Conductive traces are formed on different layers separated by dielectric layers, with through-vias providing vertical connections. This dimensional approach allows complex interconnections to be achieved without increasing planar complexity, enabling efficient integration of multiple MEMS devices.
2Volume of moving object
If multiple MEMS devices are manufactured on a single chip, then miniaturization is achieved, but manufacturing process complexity increases
Solution Approach 1:
The patent employs universal manufacturing processes that can accommodate multiple different MEMS device types on a single chip. The same sequence of steps—forming through-vias, depositing conductive materials, forming dielectric layers, and patterning traces—can be used regardless of the specific MEMS device type being manufactured. This universality reduces manufacturing process complexity despite producing diverse devices.
Solution Approach 2:
The patent performs preliminary actions by pre-forming conductive plugs in through-vias and establishing the basic interconnection architecture before fabricating the specific MEMS device structures. This preliminary preparation simplifies subsequent manufacturing steps and enables consistent production of multiple device types with reduced process complexity.
3Manufacturing precision
If traditional separate manufacturing processes are used for different MEMS devices, then manufacturing precision is maintained, but production efficiency and cost increase
Solution Approach 1:
The patent merges multiple separate MEMS device manufacturing processes into a single integrated process flow. Different MEMS devices are fabricated simultaneously on the same chip using the same sequence of manufacturing steps, including identical processes for forming conductive interconnections, dielectric layers, and device structures. This merging maintains manufacturing precision through consistent process parameters while dramatically improving production efficiency and reducing costs.
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
Enables the cost-effective and miniaturized integration of MEMS devices with reduced manufacturing complexity, achieving efficient electrical connections and enabling the production of smaller, more integrated MEMS devices.
Implementation Method 1
A cap wafer is bonded to the second substrate by bonding the second plurality of metal bonds to the first plurality of metal bonds
Implementation Method 2
Portions of the cap wafer are removed to expose the second sealed cavity to ambient pressure
Data Source
AI summary
A MEMS device and methods of forming are provided. A dielectric layer of a first substrate is patterned to expose conductive features and a bottom layer through the dielectric layer. A first surface of a second substrate is bonded to the dielectric layer and the second substrate is patterned to form a membrane and a movable element. A cap wafer is bonded to the second substrate, where bonding the cap wafer to the second substrate forms a first sealed cavity comprising the movable element and a second sealed cavity that is partially bounded by the membrane. Portions of the cap wafer are removed to expose the second sealed cavity to ambient pressure.