Domed Internal Baffle Plate for CVD Showerhead Gas Uniformity
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Solution Overview
Problem
In chemical vapor deposition (CVD) processes, uneven distribution of gaseous precursors leads to non-uniform deposition on substrates, resulting in inconsistent film thickness and reduced process control.
Innovation Solution
The introduction of a domed internal baffle plate within the showerhead of the CVD system alters the gas flow distribution, ensuring a more uniform distribution of gaseous precursors and cleaning gases across the substrate surface.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a conventional showerhead without internal baffle plate is used, then the device complexity is low, but the gas flow distribution is uneven leading to non-uniform deposition
Solution Approach 1:
The internal baffle plate is segmented with multiple perforations distributed across its surface, dividing the gas flow into multiple streams that redistribute more uniformly across the substrate area, thereby improving film thickness uniformity
Solution Approach 2:
The internal baffle plate acts as an intermediary component between the gas inlet and the substrate, mediating the gas flow distribution by redirecting and dispersing the precursor gases through its perforated structure to achieve more uniform deposition
2Productivity
If gas flow rate is increased to improve deposition speed, then productivity increases, but gas flow distribution becomes more uneven
Solution Approach 1:
The baffle plate design allows the gas flow distribution pattern to dynamically adapt to varying flow rates, maintaining effective redistribution across different deposition speeds through its geometric structure and perforation pattern
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 configuration enhances the uniformity of film deposition, improving thickness consistency and process control, with experiments showing a 50% improvement in wafer uniformity from 0.8% to 0.4%.
Implementation Method 1
The introduction of a domed internal baffle plate within the showerhead of the CVD system alters the gas flow distribution, ensuring a more uniform distribution of gaseous precursors and cleaning gases across the substrate surface
Implementation Method 2
Chemical vapor deposition (CVD) is a process often used in the semiconductor industry to deposit materials and produce thin films. In a typical CVD process, a substrate (e.g., wafer) is exposed to at least one volatile precursor within a reaction chamber. The precursor reacts and/or decomposes on the substrate surface to produce the desired deposited layer or film
Data Source
AI summary
Methods and systems for chemical vapor deposition (CVD) are disclosed. The methods and systems use a showerhead including a domed internal baffle plate. The domed internal baffle plate is perforated. The presence of the domed internal baffle plate improves the uniformity of gas distribution through the holes of the showerhead across the surface area of the showerhead. This improves deposition uniformity on the semiconducting wafer substrate upon which CVD is being performed, or improves the cleaning of the reaction chamber when a cleaning gas is pumped in through the showerhead.