Multi-Zone Showerhead Assembly for Uniform Gas Delivery
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Solution Overview
Problem
The challenge in semiconductor processing is to reliably form sub-half micron features and control fluid delivery to substrates for next-generation semiconductor devices, particularly in three-dimensional structures like FinFETs, where traditional showerhead assemblies lack the necessary precision for selective material deposition and uniform gas distribution.
Innovation Solution
A showerhead assembly with multiple zones and a gas delivery system that allows for independent control of inert and process gas concentrations, using a combination of underplates, diffuser plates, and gas lines to create gradients in gas distribution, ensuring uniformity and precision in gas delivery to the substrate.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If traditional showerhead assemblies are used, then the structure is simple, but the precision and uniformity of gas delivery is insufficient for sub-half micron feature fabrication
Solution Approach 1:
The showerhead assembly is divided into multiple zones (first zone, second zone, third zone) with different aperture configurations. Each zone has specific aperture sizes and densities tailored to deliver uniform gas distribution across different regions of the substrate, enabling precise control for sub-half micron feature fabrication.
Solution Approach 2:
Different zones of the showerhead have locally optimized aperture characteristics. The first zone has apertures of a first size, the second zone has apertures of a second size, and the third zone has apertures of a third size. This local differentiation ensures that each region delivers the appropriate gas flux for its specific processing requirements, achieving overall uniformity.
2Manufacturing precision
If uniform gas distribution is achieved through multiple zones and aperture variations, then manufacturing precision improves, but device complexity increases
Solution Approach 1:
The showerhead faceplate is segmented into three distinct zones, each with uniformly sized apertures within that zone. This segmentation allows independent optimization of gas delivery characteristics for each zone while maintaining manufacturing feasibility through standardized aperture patterns within each segment.
Solution Approach 2:
The aperture size parameter is varied across different zones to achieve uniform gas distribution. The first zone uses apertures of a first size, the second zone uses apertures of a second size, and the third zone uses apertures of a third size. This systematic parameter variation enables precise control over gas flux density in each region.
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 enhances the precision and uniformity of gas delivery, improving film deposition properties and enabling the fabrication of complex semiconductor structures by creating controlled gas gradients, which is crucial for increasing circuit density and processing capabilities.
Implementation Method 1
the inert gas mixes with the process gas before exiting the showerhead assembly
Implementation Method 2
an underplate positioned above the faceplate, defining a first plenum between the lid and the underplate... pass an amount of inert gas from the first plenum into a second plenum
Data Source
AI summary
The present disclosure relates to a semiconductor processing apparatus. The processing chamber includes a chamber body and lid defining an interior volume, a substrate support disposed in the interior volume and a showerhead assembly disposed between the lid and the substrate support. The showerhead assembly includes a faceplate configured to deliver a process gas to a processing region defined between the showerhead assembly and the substrate support and an underplate positioned above the faceplate, defining a first plenum between the lid and the underplate, the having multiple zones, wherein each zone has a plurality of openings that are configured to pass an amount of inert gas from the first plenum into a second plenum defined between the faceplate and the underplate, in fluid communication with the plurality of openings of each zone such that the inert gas mixes with the process gas before exiting the showerhead assembly.