Electrostatic Chuck Cooling Zones for Uniform Wafer Temperature
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Solution Overview
Problem
Existing electrostatic chucks in substrate processing systems face challenges in efficiently distributing coolant gas to maintain uniform temperature and prevent dielectric breakdown and arcing between coolant gas grooves and electrostatic clamping electrodes.
Innovation Solution
The electrostatic chuck design incorporates a top plate with a monopolar clamping electrode and a coolant gas groove pattern that includes tree-patterned groove sets to uniformly distribute coolant gas, while maintaining proper separation between coolant gas grooves and clamping electrodes to prevent dielectric breakdown.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If coolant gas grooves are placed close to electrostatic clamping electrodes to improve cooling efficiency, then temperature uniformity improves, but dielectric breakdown and arcing occur
Solution Approach 1:
The top plate is segmented into multiple cooling zones with separate coolant gas supply channels, allowing independent temperature control in different regions. This segmentation enables the electrodes to be positioned closer to cooling channels in specific areas without causing dielectric breakdown across the entire plate, as each zone can be optimized independently for both cooling efficiency and electrical insulation.
Solution Approach 2:
Different regions of the top plate are designed with different electrode configurations and cooling channel densities. Areas requiring enhanced cooling have closer spacing between electrodes and cooling channels, while areas requiring higher electrical insulation have greater spacing. This local optimization resolves the contradiction by allowing close proximity where cooling is prioritized and greater separation where dielectric strength is prioritized.
2Quantity of substance
If a monopolar clamping electrode with groove opening pattern is used to distribute coolant gas, then coolant gas distribution improves, but manufacturing complexity increases
Solution Approach 1:
The monopolar clamping electrode and the cooling channel structure are merged into a single integrated component. The groove opening patterns are formed directly in the top plate during the same manufacturing process that creates the cooling channels, eliminating the need for separate electrode fabrication and assembly steps. This integration maintains effective coolant gas distribution while significantly reducing manufacturing complexity.
Solution Approach 2:
The top plate serves multiple functions simultaneously: it provides electrical insulation, distributes coolant gas through integrated grooves, and acts as the clamping electrode itself. The groove opening pattern in the monopolar electrode enables both electrical clamping and coolant gas distribution functions in a single structure, reducing the number of separate components and simplifying manufacturing.
3Measurement precision
If multiple cooling zones with distinct groove sets are implemented, then temperature control precision improves, but device complexity increases
Solution Approach 1:
The cooling system is segmented into multiple independent zones, each with its own coolant gas supply channels and groove patterns. This allows precise temperature control in different regions of the substrate by independently adjusting coolant flow to each zone. The segmentation is achieved through modular channel designs that can be manufactured as integrated features of the top plate, minimizing the increase in device complexity while maximizing temperature control precision.
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 enhances substrate clamping and coolant gas distribution, reducing temperature non-uniformities and preventing dielectric breakdown, thereby improving the overall efficiency and reliability of substrate processing systems.
Implementation Method 1
The top plate is bonded to the baseplate via the intermediate layer and is configured to electrostatically clamp to a substrate
Implementation Method 2
Each of the distinct coolant gas groove sets includes coolant gas grooves for distributing coolant gas across a top of the top plate
Data Source
AI summary
An electrostatic chuck for a substrate processing system is provided and includes a baseplate, an intermediate layer disposed on the baseplate, and a top plate. The top plate is bonded to the baseplate via the intermediate layer and is configured to electrostatically clamp to a substrate. The top plate includes a monopolar clamping electrode and seals. The monopolar clamping electrode includes a groove opening pattern with coolant gas groove opening sets. The seals separate coolant gas zones. The coolant gas zones include four or more coolant gas zones. Each of the coolant gas zones includes distinct coolant gas groove sets. The top plate includes the distinct coolant gas groove sets. Each of the distinct coolant gas groove sets has one or more coolant gas supply holes and corresponds to a respective one of the coolant gas groove opening sets.