Thermally Deformable Wafer Chucking Membrane for Warpage Control
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Solution Overview
Problem
Semiconductor warpage due to thermal and mechanical stress leads to reliability issues, mechanical failures, and manufacturing defects, particularly impacting semiconductor products.
Innovation Solution
A membrane structure with adjustable thermal properties and mechanical stress is designed to solve the problem of semiconductor warpage due to thermal and mechanical stress, which leads to reliability issues, mechanical failures, and manufacturing defects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a rigid chucking system is used to hold the wafer, then the wafer can be securely held, but thermal and mechanical stress causes warpage leading to reliability issues and manufacturing defects
Solution Approach 1:
The patent employs a flexible membrane structure instead of a rigid chucking system. The membrane can elastically deform to accommodate wafer warpage while maintaining secure contact, thereby reducing thermal and mechanical stress on the wafer and improving chucking reliability
Solution Approach 2:
The membrane structure's physical parameters (such as thickness, material composition, and elastic modulus) are optimized to achieve the right balance between flexibility for stress reduction and sufficient rigidity for secure wafer holding. This parameter optimization resolves the contradiction between secure holding and stress-induced warpage
2Object-affected harmful factors
If the membrane structure is made more flexible to reduce stress, then warpage is reduced, but the structural strength and stability may be compromised
Solution Approach 1:
The membrane structure is constructed from composite materials that combine flexibility with sufficient strength. The composite structure allows the membrane to be soft enough to reduce warpage while maintaining the structural integrity needed for stable operation
Solution Approach 2:
By carefully selecting and optimizing material parameters such as elastic modulus, thickness, and composition of the membrane, the system achieves the optimal balance between flexibility (to reduce warpage) and strength (to maintain stability)
3Temperature
If uniform heating is applied to the membrane structure, then thermal deformation occurs, but localized warpage control is difficult
Solution Approach 1:
The heating system is divided into multiple independent heating zones that can be controlled separately. This segmentation allows localized temperature adjustment to compensate for specific warpage patterns, achieving precise warpage control while maintaining overall thermal deformation
Solution Approach 2:
Different regions of the membrane structure are subjected to different thermal conditions tailored to their specific warpage requirements. This localized quality control enables precise correction of warpage in different areas while maintaining overall system functionality
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
The membrane structure effectively addresses semiconductor warpage by thermally deforming to match the wafer's shape, ensuring stable chucking and reducing defects, thereby improving manufacturing efficiency and reducing costs.
Implementation Method 1
A temperature controller is configured to heat or cool the membrane structure to thermally deform the membrane structure
Implementation Method 2
an adsorber is configured to adsorb the wafer on the membrane structure. The adsorber may include an adsorption electrode on a lower side of the membrane structure that is configured to accumulate a charge when a voltage is applied thereto
Implementation Method 3
The vacuum line is configured to provide a negative pressure to the wafer. A vacuum pump is configured to adjust a vacuum level in the vacuum line
Data Source
AI summary
A wafer chucking system includes a membrane structure including a first layer having a first coefficient of thermal expansion (CTE) on which a wafer is mountable, and a second layer having a second CTE different from the first CTE, a temperature controller configured to thermally deform the membrane structure by heating or cooling the membrane structure, and an adsorber configured to adsorb the wafer on the membrane structure.