Gas-Phase Reactor Soak Chamber for High-Pressure Precursor Deposition
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Solution Overview
Problem
Existing gas-phase chemical reactors face challenges in achieving desired precursor concentrations, partial pressures, and absolute pressures, leading to undesired waste, long processing times, and films with undesirable properties, particularly in applications like ALD, where high partial pressures are needed to drive reactions and prevent by-product formation.
Innovation Solution
A gas-phase chemical reactor design with a reaction chamber and load/unload chamber configuration, utilizing a susceptor and vacuum source to control precursor delivery and evacuation, allowing for extended residence time and rapid pumping, eliminating the need for expensive gas distribution apparatus.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If precursors continuously flow across substrate surface, then uniform film deposition is achieved, but precursor waste increases and processing time extends
Solution Approach 1:
The patent implements periodic precursor delivery with distinct deposition and purge phases. Precursor flows intermittently rather than continuously, with the showerhead moving between substrate positions to create periodic exposure cycles. This reduces precursor waste while maintaining film uniformity through controlled intermittent deposition.
Solution Approach 2:
The showerhead is made movable rather than stationary, dynamically adjusting its position relative to the substrate. This dynamic configuration allows optimized precursor distribution patterns that reduce waste while maintaining uniform deposition, eliminating the need for continuous flow.
2Productivity
If high precursor concentration is used to drive reaction, then reaction rate increases, but unreacted precursor waste increases
Solution Approach 1:
The system uses periodic precursor delivery with optimized pulse timing and duration. High concentration precursors are delivered in controlled pulses that match the reaction kinetics, ensuring high reaction rates during deposition phases while minimizing unreacted precursor through subsequent purge phases.
Solution Approach 2:
The movable showerhead continuously scans across the substrate surface during precursor delivery, ensuring uniform coverage and maximizing reaction efficiency. This continuous useful action during deposition phases allows high precursor utilization with minimal waste.
3Manufacturing precision
If expensive gas distribution apparatus is used, then gas uniformity is improved, but device complexity and cost increase
Solution Approach 1:
The patent replaces complex stationary gas distribution apparatus with a simple movable showerhead. The gas distribution uniformity is achieved through the dynamic scanning motion rather than complex internal gas distribution structures, significantly reducing device complexity while maintaining precision.
Solution Approach 2:
The invention extracts the gas distribution function from complex internal apparatus and implements it through a simple movable component. The showerhead serves multiple functions including gas delivery, positioning, and scanning, eliminating the need for separate complex gas distribution systems.
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 design reduces precursor waste, lowers processing costs, and enables high growth rates by achieving desired precursor concentrations and pressures, facilitating efficient film formation without continuous gas flow.
Implementation Method 1
a vacuum source for evacuating the load/unload chamber
Implementation Method 2
one or more precursors flow into the reaction chamber to deposit material onto a substrate surface
Data Source
AI summary
A gas-phase chemical reactor, a system including the reactor, and methods of using the reactor and system are disclosed. An exemplary reactor includes a reaction chamber and is configured to provide a precursor within the reaction chamber for a soak period—e.g., a period wherein a supply of the precursor to the reaction chamber is ceased and before purging of the reaction chamber begins. This allows relatively high residence times, relatively high partial pressures of the precursor(s) and/or a relatively high absolute pressure to be obtained within the reaction chamber during substrate processing.