Atomic Scale Processing Reactor for Ultra-High Purity Film Growth
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Solution Overview
Problem
Existing atomic scale processing techniques face challenges in maintaining ultra-high purity conditions to reduce background impurities such as oxygen and water, which affect the quality and consistency of film growth in processes like ALD and ALE, leading to issues like high surface roughness and edge placement errors.
Innovation Solution
Implementing a reactor design with active cooling, continuous gas flow, and precise control of precursor delivery to maintain ultra-high purity conditions, using inductively coupled plasma sources and mechanical pumps to achieve background impurity levels below 10−6 Torr, and selectively adding precursors to modify surface chemistry.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional PEALD reactor design is used, then plasma enhanced atomic layer deposition can be performed, but background oxygen impurities are incorporated into non-oxide materials leading to degraded film quality
Solution Approach 1:
The patent implements an ultra-high purity (UHP) environment by reducing background oxygen partial pressure to below 10^-6 Torr through differential pumping and vacuum isolation techniques. This creates an inert atmosphere that prevents oxygen incorporation during PEALD of non-oxide materials, directly resolving the contradiction between achieving plasma enhancement and avoiding oxygen contamination.
Solution Approach 2:
The reactor is divided into separate vacuum chambers with differential pumping stages, isolating the plasma generation region from the substrate deposition region. This segmentation allows independent control of oxygen levels in different zones, enabling plasma processing while maintaining UHP conditions at the substrate to prevent oxygen impurity incorporation.
2Manufacturing precision
If slower deposition rates are used in PEALD, then better surface control is achieved, but exposure to background oxygen impurities increases leading to elevated oxygen levels in deposited layers
Solution Approach 1:
By maintaining an ultra-high purity atmosphere with oxygen partial pressure below 10^-6 Torr throughout the deposition process, the patent eliminates the trade-off between deposition rate and oxygen exposure. The inert environment prevents oxygen incorporation regardless of deposition duration, allowing optimized surface control without compromising film purity.
3Ease of manufacture
If elastomeric seals are used for vacuum isolation, then sealing is simplified, but outgassing and permeation of background species occur increasing impurity levels
Solution Approach 1:
The patent extracts and removes elastomeric seal materials from the UHP volume, replacing them with metal seals or other low-outgassing materials. This elimination of outgassing sources from within the vacuum chamber maintains lower background impurity levels while preserving vacuum isolation functionality through alternative sealing approaches.
4Adaptability or versatility
If supplemental precursor gases are added to modify surface chemistry, then enhanced process capability is achieved, but precise control of precursor partial pressure becomes critical to maintain UHP conditions
Solution Approach 1:
The patent implements feedback control through pressure gauges and flow controllers that continuously monitor and adjust precursor gas delivery. This closed-loop control system maintains precise precursor partial pressure levels, enabling surface chemistry modification while preserving UHP conditions through real-time compensation for any deviations.
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 effectively reduces background impurities, ensuring consistent and reproducible film growth with improved surface chemistry control, enhancing the capabilities of ALD, ALE, and ASALD processes.
Implementation Method 1
an inductively coupled plasma source
Implementation Method 2
The first volume is a vacuum, or the first volume is actively purged and/or backfilled with a process gas
Implementation Method 3
continuous, viscous-laminar gas flow
Data Source
AI summary
An apparatus for atomic scale processing is provided. The apparatus may include a reactor and an inductively coupled plasma source. The reactor may have inner and outer surfaces such that a portion of the inner surfaces define an internal volume of the reactor. The internal volume of the reactor may contain a fixture assembly to support a substrate wherein the partial pressure of each background impurity within the internal volume may be below 10−6 Torr to reduce the role of said impurities in surface reactions during atomic scale processing.