Socket-Type MEMS Bonding for Hermetic Packaging
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Solution Overview
Problem
Traditional bonding processes for microelectromechanical systems (MEMS) devices in integrated circuits can cause mechanical damage, leading to reduced reliability and increased manufacturing costs and time due to direct bonding and multiple patterning processes.
Innovation Solution
A socket-type bonding method where a third substrate is bonded directly to a first substrate, forming a high hermetical chamber that encases a second substrate with the MEMS device, reducing direct mechanical impact and requiring fewer patterning processes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If direct bonding is used to secure the capping structure to the MEMS device, then the bonding process is simplified, but mechanical damage occurs and reliability decreases
Solution Approach 1:
A socket structure is introduced as an intermediary component between the capping structure and the MEMS device. The socket is formed in the substrate and receives the MEMS device, while the capping structure bonds to the socket rather than directly to the MEMS device. This intermediary structure distributes bonding forces and protects the fragile MEMS device from mechanical damage during the bonding process.
2Device complexity
If traditional direct bonding process is used, then processing is simpler, but manufacturing costs and time increase due to multiple patterning processes
Solution Approach 1:
The bonding process is segmented into two independent bonding operations: first bonding the socket to the substrate, and then bonding the capping structure to the socket. This segmentation allows each bonding step to be optimized independently and eliminates the need for multiple patterning processes, thereby reducing manufacturing complexity and improving productivity.
3Device complexity
If the capping structure is bonded directly to the MEMS device, then the structure is simpler, but mechanical stress damages the MEMS device
Solution Approach 1:
The socket structure serves as a cushioning element that is prepared in advance before the MEMS device is bonded. The socket absorbs and distributes mechanical stresses during the bonding process, protecting the MEMS device from damage. This pre-prepared protective structure eliminates the need for direct bonding between the capping structure and the fragile MEMS device.
Data Source
AI summary
A method for fabricating an integrated circuit device is disclosed. The method includes providing a first substrate; bonding a second substrate to the first substrate, the second substrate including a microeelectromechanical system (MEMS) device; and bonding a third substrate to the first substrate.