Semiconductor Bonding Chamber Gas Line for Pressure Equalization
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Solution Overview
Problem
Premature contact between semiconductor substrates during bonding leads to uniformity issues, local area yield loss, and device malfunctions due to pressure imbalances caused by gas introduction in the processing chamber.
Innovation Solution
A bonding tool with a gas supply line extending directly between valves and the processing chamber, maintaining pressure equality to prevent premature contact, using a pump and gas supply system to control chamber pressure and minimize deformation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If gas is introduced into the processing chamber during bonding, then bonding can proceed, but pressure imbalances cause premature substrate contact leading to uniformity issues and yield loss
Solution Approach 1:
The gas supply line is configured to maintain equal pressure between the gas supply source and the processing chamber throughout the bonding process. This equipotential pressure configuration prevents pressure imbalances that would otherwise cause premature substrate contact, while still allowing gas to be introduced for bonding. The system achieves this through pressure equalization mechanisms that ensure both sides of the substrates experience identical pressure conditions.
2Ease of operation
If gas supply line has valves or interruptions, then gas flow can be controlled, but pressure buildup occurs causing premature contact between substrates
Solution Approach 1:
The invention removes valves and interruptions from the gas supply line configuration. The gas supply line is designed as a continuous, uninterrupted pathway from the gas source to the processing chamber, eliminating components that would create pressure buildups. This extraction of problematic elements maintains manufacturing precision while still allowing operational control through alternative means.
Solution Approach 2:
The gas supply line is pre-configured to establish pressure equality before bonding begins. The system prepares the pressure balance in advance, ensuring that when gas introduction starts, no pressure imbalances or premature contacts occur. This preliminary configuration of equal pressure pathways prevents the need for complex valve control during the actual bonding process.
3Productivity
If pressure is not maintained equally, then gas can be supplied to chamber, but substrates deform and contact prematurely causing yield loss
Solution Approach 1:
The gas supply system maintains equipotential pressure conditions across the entire bonding chamber and gas supply line. This ensures that gas can be supplied efficiently for high productivity while simultaneously preventing substrate deformation and premature contact. The equal pressure distribution eliminates differential forces that would cause manufacturing precision issues.
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
Enhances bonding uniformity, reduces yield loss, and decreases device malfunctions by maintaining consistent pressure across the gas supply line and processing chamber, preventing premature substrate contact.
Implementation Method 1
bonding tool includes a pump configured to pump the processing chamber down to a bonding pressure
Implementation Method 2
providing the bonding gas to the processing chamber at a third pressure through the gas supply system to maintain the processing chamber approximately at the second pressure
Data Source
AI summary
A bonding tool includes a gas supply line that may extend directly between valves associated with one or more gas supply tanks and a processing chamber such that gas supply line is uninterrupted without any intervening valves or other types of structures that might otherwise cause a pressure buildup in the gas supply line between the processing chamber and the valves associated with the one or more gas supply tanks. The pressure in the gas supply line may be maintained at or near the pressure in the processing chamber so that gas provided to the processing chamber through the gas supply line does not cause a pressure imbalance in the processing chamber, which might otherwise cause early or premature contact between semiconductor substrates that are to be bonded in the processing chamber.