Gas Supply Control for Void-Reduced Wafer Bonding
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Solution Overview
Problem
Existing technologies fail to efficiently reduce voids generated in the outer peripheral portion between bonded wafers during the substrate bonding process.
Innovation Solution
A control device and method that adjusts the supply condition of a gas between substrates using a gas supply portion to replace the atmosphere with a controlled gas, such as helium, and maintain it until the contact region reaches the outer peripheral sides, thereby minimizing void formation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If gas is supplied between substrates during bonding, then void formation is reduced, but device complexity increases due to additional gas supply control mechanisms
Solution Approach 1:
The gas supply portion supplies gas between the substrates before the bonding wave reaches the outer peripheral portion, in advance preparing a controlled gas environment that prevents void formation when the bonding wave arrives. This preliminary action ensures bonding quality without requiring complex real-time monitoring systems.
Solution Approach 2:
A controlled gas (such as nitrogen or other inert gas) is supplied between the substrates to replace air and create an inert atmosphere. This prevents oxidation and controls the bonding environment, reducing void formation while maintaining bonding quality through a simple gas supply mechanism rather than complex control systems.
2Reliability
If gas supply is maintained until contact region reaches outer periphery, then voids are effectively reduced, but bonding time increases
Solution Approach 1:
Gas is supplied in advance before the bonding wave reaches the outer peripheral portion and continues until the contact region reaches the periphery. This timing strategy ensures voids are prevented without requiring extended bonding time, as the gas environment is prepared beforehand and maintained only through the critical phase.
Solution Approach 2:
The gas supply is maintained continuously from before the bonding wave arrival until the contact region reaches the outer periphery, ensuring uninterrupted protection against void formation throughout the entire critical bonding phase, optimizing both void reduction and process efficiency.
3Strength
If controlled gas environment is maintained, then bonding strength is enhanced, but gas consumption increases
Solution Approach 1:
The controlled gas environment is established before bonding begins and maintained only until the contact region reaches the outer periphery. This limited-duration approach ensures enhanced bonding strength during the critical phase while minimizing gas consumption by not maintaining the environment beyond what is necessary.
Solution Approach 2:
An inert gas atmosphere is used to enhance bonding strength by preventing oxidation and controlling the chemical environment during bonding. The gas is supplied only during the necessary bonding phase, achieving strong bonds while controlling consumption through precise timing rather than continuous supply.
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
Effectively reduces voids and ensures stable bonding by maintaining a controlled gas environment, enhancing the bonding strength and integrity of substrates.
Implementation Method 1
a gas supply portion configured to supply a gas between the substrates
Data Source
AI summary
A control device configured to control a supply condition of a gas which is supplied between two substrates that are to be bonded to each other by a substrate bonding device, is configured to control the supply condition based on a measurement result obtained by a measurement in relation to at least one of the substrate, another substrate bonded before the substrate is bonded, or the substrate bonding device, and the two substrates are bonded to each other by a contact region expanding after the contact region is formed in a center.