CMP Carrier Head Perimeter Chamber for Edge Pressure Control
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Solution Overview
Problem
Existing chemical mechanical polishing (CMP) carrier heads struggle to achieve precise pressure application on the edge peripheral and adjacent areas of substrates, leading to uneven polishing results.
Innovation Solution
The carrier head incorporates a substrate receiving member with a perimeter portion pressurizing chamber, utilizing a contact coupling structure and fluid pressure to precisely control pressure application on the edge peripheral and adjacent areas of substrates.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If clamps are used to fix the flaps forming the chamber for applying pressure to the perimeter portion, then the chamber can be sealed to maintain fluid pressure, but space is occupied by the clamps and fixing work space is required, restricting the ability to reduce size or change shape of the chamber
Solution Approach 1:
The patent replaces the mechanical clamp-based sealing system with a friction-based sealing mechanism. The O-ring groove and O-ring combination creates a seal through elastic deformation and friction rather than mechanical clamping, eliminating the need for complex clamp structures and reducing overall device complexity while maintaining sealing reliability
Solution Approach 2:
The patent uses fluid pressure (pneumatic or hydraulic) applied to the membrane to transmit force to the perimeter portion. This pneumatic/hydraulic system replaces the need for mechanical clamps to maintain pressure, allowing the chamber to be sealed and pressurized through fluid mechanics rather than mechanical fastening
2Reliability
If thick rim portions are fixed to the base by means of clamps, then the chamber can be sealed, but there is space occupied by clamps and fixing work space, restricting size reduction
Solution Approach 1:
The patent replaces thick rim portions requiring clamp fixation with a thin rim design sealed by an O-ring in an O-ring groove. This substitution of mechanical clamping with elastic sealing allows significant reduction in rim thickness and overall chamber volume while maintaining sealing effectiveness
Solution Approach 2:
The patent uses a flexible membrane as the pressure transmission element and an O-ring (a flexible sealing element) to create the seal. These flexible components replace rigid thick rims and clamps, enabling a more compact chamber design with reduced volume while maintaining sealing reliability through the elastic properties of the flexible materials
3Reliability
If all flaps forming a chamber are to be fixed, then the chamber can be sealed, but space occupied by clamps and fixing work space is required
Solution Approach 1:
The patent replaces the mechanical clamp fixation operation with a simple O-ring insertion operation. The O-ring groove guides the O-ring into place, and elastic deformation provides the sealing action automatically, eliminating the need for complex clamp installation and simplifying the fixing operation significantly
Solution Approach 2:
The O-ring groove and O-ring combination creates a self-sealing mechanism. When the membrane is pressurized, the O-ring automatically deforms to seal the chamber without requiring external clamping or fixing operations. The system serves itself by using the operating pressure to enhance the sealing effect
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 design enables precise pressure control, improving polishing uniformity and facilitating effective CMP processes, especially on the edge peripheral and adjacent areas of substrates.
Implementation Method 1
fluid pressure is applied to an outermost chamber C1 to press the perimeter portion 32 toward the substrate 50
Data Source
AI summary
A carrier head for a chemical mechanical polishing apparatus comprises: a base; a substrate receiving member comprising a plate portion having an outer surface for receiving a substrate and an inner surface at the back of the outer surface, a perimeter portion extended in a height direction from an edge of the plate portion, a securing portion extended from an outer part of the perimeter portion and connected to a lower part of the base, and a contact portion extended from an inner part of the perimeter portion; a contact coupling structure connected to the lower part of the base to provide a contact surface to the contact portion; and a perimeter portion pressurizing chamber formed by taking the securing portion and the contact portion as chamber walls when the contact portion contacts firmly the contact coupling structure by means of fluid pressure.