Cooled Electrostatic Chuck Seal Assembly for Substrate Temperature Control
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Solution Overview
Problem
Current semiconductor manufacturing techniques face challenges in maintaining substrate temperatures below −20 degrees Celsius for precise etching processes, which is crucial for forming smooth, vertical trenches and improving material selectivity, especially for next-generation VLSI and ULSI devices.
Innovation Solution
A substrate support assembly is developed, incorporating an electrostatic chuck (ESC) with a cryogenic chiller and a seal assembly that maintains the substrate at temperatures less than −20 degrees Celsius, while allowing other chamber surfaces to be at different temperatures, using a base channel and refrigerant lines to control temperature and prevent vacuum leaks.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the substrate is cooled to temperatures below -20 degrees Celsius for improved etching selectivity and trench formation, then etching precision and material selectivity are improved, but maintaining thermal isolation and preventing vacuum leaks becomes more difficult
Solution Approach 1:
The substrate support assembly is divided into thermally isolated segments: the ESC base assembly containing the substrate, the facility plate, and the insulator plate. This segmentation allows the substrate region to be cooled to -20°C or below while keeping other chambers at different temperatures, preventing thermal contraction issues that would compromise vacuum seals.
Solution Approach 2:
An insulator plate is introduced as a thermal intermediary between the cooled ESC base assembly and the facility plate. This insulator plate prevents heat transfer pathways that would cause thermal contraction and vacuum leaks, while still allowing the substrate to maintain its required low temperature for precise etching.
2Manufacturing precision
If the substrate temperature is maintained below -20 degrees Celsius for enhanced etching selectivity, then selectivity between materials increases exponentially, but thermal management complexity increases
Solution Approach 1:
The thermal management system is segmented into independent zones: the ESC base assembly with its own cooling channel for substrate cooling, the facility plate for chamber temperature control, and the insulator plate for thermal isolation. This segmentation simplifies thermal management by allowing each zone to be controlled independently.
Solution Approach 2:
Different regions of the substrate support assembly are assigned different thermal properties: the ESC base assembly is designed for active cooling to achieve -20°C or below at the substrate, while the facility plate and insulator plate are designed for thermal isolation. This local differentiation of thermal quality enables precise temperature control where needed without complicating the entire system.
3Stability of the object's composition
If thermal isolation is implemented to maintain substrate temperature below -20 degrees Celsius, then temperature uniformity across the substrate is improved, but structural complexity of the support assembly increases
Solution Approach 1:
The support assembly is segmented into modular components (ESC base assembly, facility plate, insulator plate) that can be independently designed and assembled. This modularity manages structural complexity by breaking down the thermal isolation function into discrete, manageable segments rather than a monolithic complex structure.
Solution Approach 2:
The insulator plate serves as a thermal intermediary component that simplifies the overall structure by providing a dedicated thermal barrier. This intermediary element cleanly separates the cooled substrate region from the warmer chamber environment, achieving temperature uniformity without requiring complex multi-layer insulation structures.
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 enables uniform substrate cooling, improving etching selectivity and forming smooth vertical trenches, while maintaining thermal isolation and preventing vacuum leaks, thus enhancing the processing capabilities for nanometer-scale semiconductor features.
Implementation Method 1
a seal assembly. The seal assembly includes an upper flange coupled to the base channel of the ESC base assembly, the upper flange disposed in the facility plate, a lower flange coupled to the upper flange, the lower flange disposed in the facility plate, a gasket disposed between the upper flange and the lower flange
Implementation Method 2
a base channel disposed therein... A passage is connected to the base channel, the passage is defined by connected openings of the upper flange, the gasket, the lower flange, the insulator tube, and the base assembly
Implementation Method 3
using a base channel and refrigerant lines to control temperature
Implementation Method 4
an insulator plate coupled to the facility plate... an insulator tube coupled to the lower flange... maintaining thermal isolation
Implementation Method 5
electrostatic chuck (ESC) base assembly
Data Source
AI summary
Embodiments described herein relate to a substrate support assembly. The substrate support assembly includes an ESC base assembly having a base channel disposed therein, a facility plate, the facility plate coupled to the ESC base assembly with a vacuum region therebetween, and a seal assembly. The seal assembly includes an upper flange coupled to the base channel of the ESC base assembly, the upper flange disposed in the facility plate, a lower flange coupled to the upper flange, the lower flange disposed in the facility plate, a gasket disposed between the upper flange and the lower flange, and an insulator tube coupled to the lower flange. A passage is connected to the base channel, the passage is defined by connected openings of the upper flange, the gasket, the lower flange, the insulator tube, and the base assembly.