Showerhead Electrode Assembly Low-Particle Performance
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Solution Overview
Problem
Semiconductor material processing apparatuses face challenges in minimizing particle and metal contamination of substrates due to the use of corrosive and erosive process gases and plasma, which existing technologies have not adequately addressed.
Innovation Solution
The showerhead electrode assembly features a modular design with a top and bottom electrode made of semiconductor material, including a gas manifold and gas holes for fluid communication, along with a heat transfer gas supply to control electrode temperature and maintain low-particle performance, ensuring minimal contamination by using a separate gas passage for heating and process gases.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a showerhead electrode assembly is used in semiconductor material processing, then substrate processing capability is improved, but particle and metal contamination of substrates increases due to corrosive and erosive process gases and plasma
Solution Approach 1:
The showerhead electrode assembly is divided into multiple segments including a top electrode, bottom electrode, and intermediate structure with plenums. This segmentation allows different regions to serve specific functions while minimizing contamination sources. The modular design enables replacement of contaminated parts without replacing the entire assembly.
Solution Approach 2:
The patent extracts and removes potential contamination sources from the electrode assembly design. This includes using semiconductor material electrodes that resist corrosion, designing gas flow paths that prevent particle accumulation, and eliminating crevices where contaminants could accumulate. The gas distribution system is designed to flush out particles before they can contaminate substrates.
2Manufacturing precision
If electrode temperature is increased to improve processing uniformity, then manufacturing precision is improved, but particle generation from thermal effects increases
Solution Approach 1:
The electrode assembly implements local quality control through temperature management. Different regions of the electrode can be cooled or heated independently through the gas distribution system. The bottom electrode includes cooling channels that can be activated locally to prevent overheating and particle generation in specific high-stress areas while maintaining optimal temperature in other regions for processing uniformity.
3Ease of manufacture
If a modular electrode design with multiple gas passages is used, then ease of manufacture and maintenance is improved, but device complexity increases
Solution Approach 1:
The patent merges multiple gas distribution functions into a unified modular electrode assembly. The top electrode, bottom electrode, and intermediate structures with plenums are integrated into a single replaceable unit. Gas passages are combined into the electrode structure itself rather than being separate components, simplifying assembly while maintaining manufacturing flexibility. The modular design allows the entire gas distribution system to be replaced as one unit if contamination occurs.
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 substrate contamination by maintaining low-particle performance and controlling electrode temperature, enhancing the uniformity of semiconductor processing and improving process yields.
Implementation Method 1
supplying a pre-heated heating gas from a heating gas supply section to the showerhead electrode via a first gas passage in the showerhead electrode assembly to heat the showerhead electrode
Implementation Method 2
supplying a heat transfer gas from a heat transfer gas supply section to the showerhead electrode assembly via a second gas passage in the showerhead electrode assembly to transfer heat from the showerhead electrode during generation of the plasma
Implementation Method 3
energizing the process gas to generate plasma in the plasma processing chamber to plasma process a substrate disposed on a substrate support in the plasma processing chamber
Data Source
AI summary
Showerhead electrodes for a semiconductor material processing apparatus are disclosed. An embodiment of the showerhead electrodes includes top and bottom electrodes bonded to each other. The top electrode includes one or more plenums. The bottom electrode includes a plasma-exposed bottom surface and a plurality of gas holes in fluid communication with the plenum. Showerhead electrode assemblies including a showerhead electrode flexibly suspended from a top plate are also disclosed. The showerhead electrode assemblies can be in fluid communication with temperature-control elements spatially separated from the showerhead electrode to control the showerhead electrode temperature. Methods of processing substrates in plasma processing chambers including the showerhead electrode assemblies are also disclosed.