PE-CVD Fence Extension for Plasma Confinement and Uniformity
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Solution Overview
Problem
In semiconductor manufacturing, plasma-enhanced chemical vapor deposition (PE-CVD) processes often result in uneven plasma concentration over substrates, leading to reduced layer thickness uniformity, which compromises the reliability and consistency of deposited layers.
Innovation Solution
A PE-CVD apparatus with a fence extension that surrounds the plasma and substrate, confining it between the showerhead and the chuck, and utilizing high-frequency and low-frequency power sources to generate and control plasma, ensuring uniform deposition across the substrate.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If plasma is generated between the showerhead and substrate during PE-CVD process, then deposition rate is improved, but plasma concentration becomes uneven over the substrate leading to reduced layer thickness uniformity
Solution Approach 1:
The fence extension acts as an intermediary structure that mediates between the plasma source and the substrate. It confines the plasma within a defined region, ensuring uniform plasma distribution across the substrate surface while maintaining high deposition rates. The fence extension is positioned to extend from the showerhead toward the substrate, creating a controlled plasma confinement region that prevents plasma from directly contacting the substrate edges, thereby achieving both high productivity and uniform layer thickness.
2Productivity
If the showerhead is positioned close to the substrate to increase deposition rate, then productivity is improved, but plasma concentration uniformity deteriorates
Solution Approach 1:
The fence extension serves as a mediator that allows the showerhead to be positioned close to the substrate for high deposition rates while preventing direct plasma-substrate contact at the edges. The fence extension creates a controlled plasma confinement region that maintains plasma concentration uniformity across the substrate surface, resolving the contradiction between proximity-based productivity improvement and plasma uniformity maintenance.
3Productivity
If plasma is allowed to contact the substrate directly, then deposition efficiency is improved, but layer reliability is reduced due to uneven thickness
Solution Approach 1:
The fence extension acts as an intermediary barrier that prevents direct plasma-substrate contact while maintaining high deposition efficiency. It confines the plasma within a controlled region, ensuring uniform plasma distribution and consistent layer thickness across the substrate, thereby improving layer reliability without sacrificing deposition efficiency.
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 enhances layer thickness uniformity and deposition rate, improving the reliability and productivity of semiconductor devices by minimizing plasma density differences across the substrate, thereby addressing the issue of uneven layer deposition.
Implementation Method 1
a high-frequency power source, coupled to the showerhead, configured to generate plasma between the showerhead and the loaded substrate supported on the top surface of the chuck during the deposition process
Implementation Method 2
The fence extension may be at least partially disposed between the wall portion and the plasma during the deposition process
Data Source
AI summary
A deposition apparatus includes a chuck in a process chamber, the chuck having a top surface on which a substrate is loaded, a showerhead disposed over the chuck, and a fence extension disposed in the process chamber. Plasma is generated in a space between the showerhead and the loaded substrate during a deposition process. The fence extension at least partially confines the plasma in the space during the deposition process, thereby enabling improved thickness uniformity and reliability of a layer deposited on the loaded substrate during the deposition process.