Multi-Zone Showerhead Assembly for Uniform Semiconductor Gas Flow
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Solution Overview
Problem
Existing vapor deposition chambers exhibit non-uniform gas flow across substrates, leading to non-uniformity in film deposition, which is a challenge in semiconductor manufacturing, especially with increasing substrate sizes and integration densities.
Innovation Solution
A gas distribution assembly comprising a backing plate, showerhead, and diffuser plate with multiple zones and aligned openings to control gas flow uniformity, using a diffuser plate between the backing plate and showerhead to align inlet and zone openings, and an outer annular insert to enhance gas distribution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single or multiple plenums are used in the showerhead to control gas flow, then the structure is simple, but the gas flow uniformity across the substrate surface deteriorates
Solution Approach 1:
The showerhead is divided into multiple independently controlled zones (center zone, inner annular zone, outer annular zone) with separate plenums and precursor delivery channels. This segmentation allows independent optimization of gas flow to different regions of the substrate, achieving uniform deposition across the entire substrate surface while maintaining reasonable structural complexity through modular design.
2Adaptability or versatility
If multiple channels are used to flow different precursors separately, then precursor distribution control is improved, but the gas flow uniformity across the substrate deteriorates
Solution Approach 1:
Different zones of the showerhead are equipped with different numbers and configurations of precursor delivery channels tailored to local requirements. The center zone has a central channel, the inner annular zone has radially spaced channels, and the outer annular zone has additional channels. This local differentiation ensures optimal precursor distribution to each region while maintaining overall gas flow uniformity through the multi-plenum design.
3Productivity
If the substrate size is increased to improve production yield, then production capacity is improved, but the deposition uniformity across the substrate deteriorates
Solution Approach 1:
The showerhead is divided into multiple independently controlled zones (center zone, inner annular zone, outer annular zone) with separate plenums and precursor delivery channels. This segmentation allows independent optimization of gas flow to different regions of the substrate, achieving uniform deposition across the entire substrate surface while maintaining reasonable structural complexity through modular design.
Solution Approach 2:
The invention transitions from a single-plane gas distribution approach to a multi-dimensional zoned architecture with concentric annular zones at different radial distances from the center. This dimensional expansion enables precise control of gas flow patterns across the entire substrate area, maintaining deposition uniformity even as substrate size increases to accommodate higher production yields.
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
Improves gas flow uniformity and deposition uniformity across larger substrate areas, enabling finer control of precursor delivery and enhancing film thickness consistency.
Implementation Method 1
The diffuser plate has a center opening that aligns with the center inlet and center recess, and at least one zone opening that aligns with zone inlets and annular zone recesses, controlling gas flow uniformity across zones
Data Source
AI summary
Gas distribution assemblies for semiconductor manufacturing processing chambers that improve flow uniformity are described. The gas distribution assemblies comprise a backing plate, a showerhead and a diffuser plate between the backing plate and the showerhead. The diffuser plate has a center opening and at least one zone opening aligned with inlets in the backing plate and recesses in the showerhead.