Gas Distribution Assembly for Semiconductor Reactors
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Solution Overview
Problem
Existing gas distribution assemblies in semiconductor processing reactors face challenges in delivering reactant gases like TEOS and Ozone without polymerization and particle formation, which can deteriorate the quality of oxide films in integrated circuits.
Innovation Solution
A gas distribution assembly with multiple reactant gas distribution plates and passageways that keep TEOS and Ozone separated throughout the system, ensuring even distribution and minimizing particle formation by maintaining separate pathways for each gas until they exit the assembly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If TEOS and Ozone are premixed in the showerhead, then uniform chemical composition is achieved, but polymerization and particle formation occur
Solution Approach 1:
The showerhead is divided into separate regions for different reactant gases (TEOS and Ozone), with individual distribution plates and passageways for each gas. This segmentation prevents mixing of reactants in the showerhead while maintaining uniform distribution of each gas across the wafer surface, thereby eliminating particle formation while preserving film deposition uniformity.
2Reliability
If showerhead temperature is increased, then liquid condensation is reduced, but Ozone concentration decreases
Solution Approach 1:
By separating the delivery pathways for TEOS and Ozone into distinct passageways and distribution zones, the system allows independent temperature control and concentration management for each gas. This enables optimization of TEOS delivery through temperature control without compromising Ozone concentration, as each gas maintains its own dedicated flow path.
3Object-generated harmful factors
If multiple reactant gases are delivered through separate passageways, then polymerization is prevented, but device complexity increases
Solution Approach 1:
The gas distribution assembly employs separate passageways and distribution plates for each reactant gas, which prevents polymerization by keeping gases isolated until they reach the reaction zone. While this increases structural complexity, the modular design with standardized distribution plates helps manage the complexity.
Solution Approach 2:
The patent utilizes three-dimensional stacking of distribution plates and passageways to achieve separate gas delivery. By transitioning from two-dimensional surface distribution to three-dimensional volumetric distribution, the system achieves effective gas separation and control while organizing the complexity into a compact, layered structure.
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 design enhances the uniformity of film deposition, improves gap fill capability, reduces particle generation, and optimizes the use of reactant gases, leading to better semiconductor processing outcomes.
Implementation Method 1
a reactant gas supply plate which is coupled in fluid flowing relation relative to at least first and second reactant gases; at least one reactant gas distribution plate coupled in fluid receiving relation relative to the reactant gas supply plate for substantially evenly distributing at least one of the first and second reactant gases
Implementation Method 2
deliver gaseous chemicals to a semiconductor work piece for purposes of depositing uniform films or layers on the surface of the semiconductor work piece by chemical vapor deposition, atomic layer deposition or the like
Data Source
AI summary
A semiconductor work piece processing reactor is described and which includes a processing chamber defining a deposition region; a pedestal which supports and moves a semiconductor work piece to be processed within the deposition region of the processing chamber; and a gas distribution assembly mounted within the processing chamber and which defines first and second reactive gas passageways which are separated from each other, and which deliver two reactant gases to a semiconductor work piece which is positioned near the gas distribution assembly.