Electrostatic Chuck Venting Layout for Faster Cooling Gas Release
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Solution Overview
Problem
Current electrostatic chuck designs require a lengthy venting period to equalize pressure differentials after processing, which slows down semiconductor manufacturing throughput due to slow escape of residual cooling gas from larger open spaces beneath the workpiece.
Innovation Solution
An electrostatic chuck assembly with a gas flow conduit connecting directly to device openings, including a ceramic layer with gas flow vents, enhances gas flow and venting efficiency by allowing cooling gas to flow directly from the conduit to these spaces, reducing the venting period.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If a gas flow conduit is connected to device openings to improve venting efficiency, then the venting period is reduced, but the device complexity increases
Solution Approach 1:
The gas flow conduit is merged with the device openings by directly connecting the conduit to the openings that contain devices. This integration allows cooling gas to flow directly into the larger open spaces beneath the workpiece through the device openings, enabling efficient venting of residual gas without requiring separate dedicated venting structures, thus reducing venting time while avoiding excessive complexity
Solution Approach 2:
The device openings, which originally serve to accommodate devices, are given a dual function by also serving as pathways for gas flow venting. The gas flow conduit connects to these openings, allowing them to function both as device housings and as venting channels, thereby improving venting efficiency without adding separate dedicated venting structures
2Temperature
If cooling gas flows through larger open spaces beneath the workpiece, then cooling coverage is improved, but the escape of residual gas becomes slower
Solution Approach 1:
The larger open spaces beneath the workpiece are segmented into multiple regions by positioning several device openings at different locations. Each device opening acts as a separate venting pathway, dividing the large open space into smaller sub-regions that can be vented more efficiently through multiple exit points rather than a single pathway
Solution Approach 2:
The gas flow system transitions from a two-dimensional planar flow pattern to a three-dimensional flow pattern by utilizing vertical device openings that extend through the chuck structure. This allows cooling gas to flow not only horizontally across the workpiece but also vertically through the device openings, creating multiple flow paths that improve both cooling coverage and venting speed
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 significantly reduces the time needed for venting residual cooling gas, enabling faster removal of the workpiece from the chuck and improving manufacturing efficiency.
Implementation Method 1
a gas flow conduit extending horizontally over an area of the base layer... a gas flow inlet that passes into the base layer and connects to the gas flow conduit
Implementation Method 2
the electrostatic chuck secures the workpiece to an upper surface of the chuck by creating an electrostatic attractive force between the workpiece and the chuck. A voltage is applied to electrodes that are contained within the chuck, to induce charges of opposite polarities in the workpiece and the chuck
Data Source
AI summary
Described are electrostatic chucks designed for use in supporting a workpiece during a workpiece processing step, the electrostatic chuck including a gas flow system.