Electrostatic Chuck Thermal Isolators Reduce Crosstalk
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Solution Overview
Problem
Conventional electrostatic chucks experience significant crosstalk between thermal zones, which can lead to temperature regulation issues, as heat from one zone can excessively affect adjacent zones, making precise temperature control challenging in semiconductor processing applications.
Innovation Solution
The implementation of an electrostatic chuck with thermally isolated zones, utilizing thermal isolators filled with silicone or vacuum, which reduce crosstalk by up to 50% by minimizing heat flux between zones, allowing for independent temperature control of each zone.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If conventional electrostatic chucks are used with multiple thermal zones, then temperature regulation capability is improved, but crosstalk between zones increases
Solution Approach 1:
The chuck body is segmented into multiple thermally isolated zones by inserting thermal isolators between adjacent zones. These isolators divide the continuous thermal path into separate segments, allowing each zone to be independently temperature-controlled without significant heat transfer to neighboring zones.
Solution Approach 2:
Thermal isolators are introduced as intermediary elements between adjacent thermal zones. These isolators act as thermal barriers that mediate the heat transfer between zones, blocking excessive heat flow while allowing the zones to maintain their respective temperature profiles.
2Measurement precision
If thermal isolators are added to reduce crosstalk, then temperature control precision is improved, but device complexity increases
Solution Approach 1:
Thin thermal isolator films or layers are inserted between thermal zones within the chuck body. These thin thermal barrier layers provide effective thermal isolation without adding significant structural complexity or occupying excessive space within the chuck assembly.
Solution Approach 2:
The chuck structure utilizes composite construction with different materials having varying thermal conductivities. Thermal isolators made from low thermal conductivity materials are integrated into the chuck body, creating a composite structure that provides both mechanical support and thermal management 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
This solution effectively reduces crosstalk between thermal zones, enabling more precise temperature regulation and control, thereby improving the accuracy of temperature management in semiconductor processing.
Implementation Method 1
The different thermal zones are separated by thermal isolators that extend from an upper surface of the thermally conductive base towards a lower surface of the thermally conductive base. The thermal isolators reduce crosstalk between thermal zones of the electrostatic chuck by as much as 50% as compared to traditional electrostatic chucks.
Data Source
AI summary
A substrate support assembly includes a ceramic puck and a thermally conductive base having an upper surface that is bonded to the ceramic puck. The thermally conductive base includes a plurality of thermal zones and a thermally managed material embedded in the thermally conductive base at the upper surface of the thermally conductive base in one or more of the plurality of thermal zones. The thermally managed material has different thermal conductive properties along a first direction and a second direction. The thermally conductive base further includes a plurality of thermal isolators that extend from the upper surface of the thermally conductive base towards a lower surface of the thermally conductive base between two or more of the plurality of thermal zones without contacting the lower surface of the thermally conductive base. Each of the plurality of thermal isolators provides a degree of thermal isolation.