Adjustable Wafer Chuck for Warped Wafer Grip Uniformity
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Solution Overview
Problem
Existing wafer chucks suffer from premature wear of contact pads due to warped semiconductor wafers, leading to non-uniform grip forces and increased maintenance costs in semiconductor device fabrication.
Innovation Solution
An adjustable wafer chuck with a base portion and a pad portion, where the pad portion comprises contact pads affixed to adjustable base structures that can move along a plane in two directions, allowing for uniform spacing adjustment to accommodate warped wafers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a fixed wafer chuck is used, then the structure is simple, but the contact pads wear prematurely due to warped wafers
Solution Approach 1:
The wafer chuck incorporates adjustable base structures that enable dynamic adaptation to wafer warpage. The contact pads are mounted on bases that can be independently positioned in vertical and lateral directions, transforming a static structure into a dynamic one that compensates for wafer deformation and prevents premature contact pad wear.
Solution Approach 2:
The wafer chuck is divided into multiple independent adjustable base structures, each capable of independent positioning. This segmentation allows each contact pad to be individually adjusted to accommodate local variations in wafer warpage, preventing uniform wear across all contact pads and extending component life.
2Manufacturing precision
If contact pads are fixed on the wafer chuck, then the manufacturing is simple, but the grip force becomes non-uniform on warped wafers
Solution Approach 1:
The contact pads are mounted on adjustable bases that can be dynamically positioned to achieve uniform vertical spacing across all contact pads. This dynamic adjustment capability ensures uniform grip force distribution on warped wafers, improving manufacturing precision while the modular design keeps assembly complexity manageable.
Solution Approach 2:
Each base structure can be independently adjusted to provide local quality adjustments in contact pad positioning. This allows each contact pad to be optimized for its specific location on the warped wafer surface, ensuring uniform grip force across the entire wafer area despite variations in wafer shape.
3Ease of operation
If the wafer chuck cannot be adjusted, then the operation is simple, but maintenance costs increase due to premature wear
Solution Approach 1:
The wafer chuck incorporates adjustable base structures that enable dynamic adaptation to wafer warpage. The contact pads are mounted on bases that can be independently positioned in vertical and lateral directions, transforming a static structure into a dynamic one that compensates for wafer deformation and prevents contact pad wear.
Solution Approach 2:
The wafer chuck is divided into multiple independent adjustable base structures, each capable of independent positioning. This segmentation allows each contact pad to be individually adjusted to accommodate local variations in wafer warpage, preventing uniform wear across all contact pads and extending component life.
Data Source
AI summary
Various embodiments of the present application are directed toward an adjustable wafer chuck. The adjustable wafer chuck is configured to hold a wafer. The adjustable wafer chuck comprises a base portion and a pad portion. The base portion comprises a plurality of adjustable base structures. The pad portion is disposed on a first side of the base portion. The pad portion comprises a plurality of contact pads disposed on the plurality of adjustable base structures. Each of the adjustable base structures are configured to move along a plane in a first direction and configured to move along the plane in a second direction that is opposite the first direction.