Complementary Gas Flow Patterns for ALD Uniformity
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Solution Overview
Problem
Current atomic layer deposition (ALD) processes face issues with incompatible chemistries leading to chemical vapor deposition, gas phase particle defects, and non-uniform film deposition due to gas flow, temperature, and plasma non-uniformity, particularly affecting vertical sidewall film quality and throughput in semiconductor manufacturing.
Innovation Solution
A processing chamber design with complementary gas flow and plasma patterns between processing stations, utilizing gas diffusers, cooling channels, and heaters with symmetrical patterns rotated to provide uniform film deposition, and independently controlled plasma generating elements to ensure uniform plasma exposure and film properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a traditional time-domain ALD process is used with sequential gas flow, then chemistry incompatibility is avoided, but throughput is reduced due to long purge/pump out times
Solution Approach 1:
The patent transitions from time-domain separation (sequential gas flow) to spatial-domain separation (simultaneous gas flow in different regions). The processing chamber is divided into multiple spatial zones with independent gas flow paths, allowing incompatible chemistries to coexist without mixing, thereby eliminating purge times and improving throughput while maintaining chemistry compatibility.
Solution Approach 2:
The processing chamber is segmented into multiple independent processing regions, each with its own gas distribution system. This segmentation allows different incompatible chemistries to be applied simultaneously in different spatial zones without cross-contamination, resolving the throughput-limiting purge requirement while preserving chemistry compatibility.
2Productivity
If spatial ALD chamber moves wafers between environments faster, then throughput is improved, but gas flow non-uniformity causes thickness non-uniformity
Solution Approach 1:
The gas distribution system is designed with locally optimized features including adjustable gas distribution plates, variable flow rate controllers for each processing zone, and tailored diffuser geometries. This local quality control ensures uniform gas flow and film deposition across the wafer surface even during rapid spatial transitions, maintaining manufacturing precision while achieving high throughput.
Solution Approach 2:
The system employs dynamic gas flow control with independently adjustable flow rates for each processing zone, allowing real-time optimization of gas distribution as wafers move between stations. This dynamic adjustment compensates for position-dependent flow variations and maintains uniform deposition conditions throughout the rapid spatial processing cycle.
3Manufacturing precision
If very high RF or microwave plasma is used, then sidewall film quality is improved, but plasma uniformity deteriorates
Solution Approach 1:
The plasma generation system is segmented into multiple independent plasma sources distributed across different processing zones. Each plasma source operates at optimized power levels and can be independently controlled, allowing high plasma density for quality films while maintaining spatial uniformity through distributed, balanced plasma generation across the chamber.
Solution Approach 2:
The plasma processing system implements local quality control through independently controllable plasma sources in each zone, allowing tailored plasma parameters (power, gas flow, pressure) for specific processing requirements. This enables high plasma density where needed for film quality while maintaining overall plasma uniformity through localized optimization.
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 achieves substantially uniform film thickness, refractive index, and plasma exposure, enhancing film quality and reducing defects, thereby improving the overall deposition process efficiency and flexibility.
Implementation Method 1
a first gas flow pattern from one or more of a first gas diffuser
Implementation Method 2
a first cooling channel pattern
Implementation Method 3
a first heater
Implementation Method 4
Plasma solutions can be used to provide the additional energy in the form of ions and radicals to the ALD film
Data Source
AI summary
Apparatus and methods to process one or more wafers are described. A first processing station has a first gas flow pattern from one or more of a first gas diffuser, a first cooling channel pattern, or a first heater. A second processing station has a second gas flow pattern from one or more of a second gas diffuser, a second cooling channel pattern, or a second heater. The second gas diffuser, the second cooling channel pattern, or the second heater is rotated or translated relative to the first gas diffuser, the first cooling channel pattern, or the first heater to provide the second gas flow pattern complementary to the first gas flow pattern.