Heater Plate Purge Channel Layout for Uniform Deposition
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Solution Overview
Problem
Current substrate processing techniques face challenges in achieving uniform purge flow and preventing unwanted material deposition during high-temperature processes, especially in next-generation VLSI and ULSI manufacturing, where precise temperature control and gas flow management are critical for producing nanometer features.
Innovation Solution
The implementation of a substrate support assembly with a heater plate featuring distributed purge channels, an RF mesh, and a ground electrode, which enables non-contact heating, uniform gas flow distribution, and prevents deposition on processing chamber surfaces by using recursive gas paths and porous plugs to manage plasma formation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If traditional heater plates are used without distributed purge channels, then the structure is simpler, but uniform gas flow distribution cannot be achieved and unwanted material deposition occurs on processing chamber surfaces
Solution Approach 1:
The heater plate is segmented with multiple distributed purge channels formed within its thickness. These channels divide the gas flow path into multiple segments, allowing uniform distribution of purge gas across the substrate surface. The segmentation of the heater plate structure directly enables improved deposition uniformity by preventing localized gas flow variations.
Solution Approach 2:
The heater plate is designed with different functional regions: heating zones embedded within the plate body and purge channels distributed at specific locations. Each region has optimized properties - heating zones provide thermal energy while purge channels provide gas flow paths. This local differentiation of functions enables simultaneous achievement of uniform heating and uniform gas distribution.
2Productivity
If high-temperature processing is performed to improve throughput, then productivity increases, but unwanted material deposition on processing chamber surfaces worsens
Solution Approach 1:
Purge gas is introduced through the distributed purge channels before and during the deposition process to preemptively prevent material deposition on the processing chamber surfaces. This preliminary protective action creates a gas barrier that redirects deposited material away from chamber surfaces, enabling high-temperature processing without harmful side effects.
Solution Approach 2:
The purge gas flow, which could be considered a waste of gas, is converted into a beneficial protective mechanism. By directing this gas flow through the distributed channels, unwanted deposited material is redirected onto the substrate where it is useful, rather than onto chamber surfaces where it is harmful. This transforms a potential waste stream into a protective function.
3Manufacturing precision
If uniform purge flow is achieved through distributed channels, then deposition uniformity improves, but the device complexity increases
Solution Approach 1:
The purge channels are merged into the heater plate structure itself, forming an integrated component rather than separate parts. The channels are formed within the thickness of the heater plate, combining the heating function and gas distribution function into a single unified structure. This merging reduces overall system complexity while achieving uniform gas flow.
Solution Approach 2:
The heater plate serves multiple functions simultaneously: it provides heating through embedded heating zones and provides uniform gas distribution through distributed purge channels. This multi-functionality eliminates the need for separate gas distribution components, reducing device complexity while achieving the goal of uniform purge flow and improved deposition uniformity.
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 ensures efficient purging of process gases, prevents unwanted material deposition, and allows for high-temperature processing with improved deposition uniformity and substrate quality, enhancing the throughput and yield of semiconductor devices.
Implementation Method 1
a heater electrode embedded within the heater plate
Implementation Method 2
a radio frequency (RF) mesh embedded within the plate
Implementation Method 3
a ground electrode embedded within the heater plate
Data Source
AI summary
A substrate support assembly includes a heater plate including a dielectric material, a heater electrode embedded within the heater plate, a set of distributed purge channels formed within the heater plate, wherein the set of distributed purge channels provides a set of gas flow paths to equalize a gas flow from within the heater plate and direct the gas flow in a direction below the heater plate, a ground electrode embedded within the heater plate, and a radio frequency (RF) mesh embedded within the plate.