Chamber Lid Cooling Baffle for Uniform Semiconductor Processing
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Solution Overview
Problem
Semiconductor processing chambers face temperature non-uniformities across the chamber lid, leading to substrate defects, lid damage, and increased downtime due to large temperature gradients, which existing technologies have not adequately addressed.
Innovation Solution
A baffle assembly is implemented in the processing chamber to direct airflow from the center to the outer edge of the lid, utilizing a variable speed blower and temperature sensors to manage cooling, reducing temperature gradients and stress on the lid.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If high power plasma is used for substrate processing, then processing power is improved, but lid temperature increases causing temperature gradients and lid damage
Solution Approach 1:
The lid cooling system is segmented into multiple independent cooling zones with separate blowers and baffles, allowing differential cooling rates across different lid regions to optimize temperature uniformity while maintaining high processing power
Solution Approach 2:
A baffle assembly is introduced as an intermediary component between the plasma chamber and the cooling system, directing cooling gas flow to specific lid regions and mediating the heat transfer process to reduce temperature gradients
2Reliability
If lid temperature is reduced to prevent damage, then lid reliability is improved, but substrate processing temperature uniformity deteriorates
Solution Approach 1:
Different regions of the lid are provided with different cooling intensities through the baffle assembly configuration, creating local quality variations in the cooling system that maintain overall lid reliability while ensuring uniform substrate processing temperature
Solution Approach 2:
The cooling system uses variable speed blowers that can dynamically adjust their operation based on real-time temperature feedback, allowing the system to adapt cooling rates to maintain both lid reliability and substrate temperature uniformity under varying process conditions
3Device complexity
If a simple cooling system is used, then device complexity is reduced, but temperature control precision deteriorates
Solution Approach 1:
The cooling system is divided into modular segments with individual blowers and baffle assemblies for each cooling zone, making the complex system easier to manufacture, assemble, and maintain while achieving precise temperature control through coordinated operation of the segments
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
The solution effectively reduces the temperature gradient across the lid to less than 10°C, enhancing processing uniformity, reducing the likelihood of lid failure, and minimizing chamber downtime while improving substrate quality.
Implementation Method 1
a baffle assembly configured to direct the flow from the blow to a center of the lid and then to an outer edge of the lid
Implementation Method 2
two or more blowers, a controller in communication with the blower and the temperature sensor
Data Source
AI summary
An apparatus for controlling the temperature in a processing chamber for semiconductor processing is disclosed herein. In one embodiment, a baffle assembly is configured to direct air flow from a center of a lid of the processing chamber to an outer edge of the lid. The baffle assembly has a baffle center having a side surface and a bottom surface, wherein the bottom surface is ring shaped with a central opening. The baffle assembly has a middle baffle extending outward from the side surface of the baffle center. The baffle assembly has a conical baffle extending inward from the side surface of the baffle center, and a top baffle extending upward from the side surface of the baffle center.