Remote Plasma System for Stable Intermediate Reactive Species
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Solution Overview
Problem
Vapor-phase processes face challenges in forming stable intermediate reactive species using remote plasma systems, as activated species from many precursors are short-lived and recombine before reaching the substrate, leading to inefficiencies in deposition, etching, and treatment processes.
Innovation Solution
A remote plasma system with a reactor, a remote plasma unit, a pressure control device, and a control valve is used to form intermediate reactive species near the reaction chamber, maintaining steady-state conditions to increase stability and throughput, and includes a catalyst and conductance match region to facilitate the formation of desired reactants.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a remote plasma system is used to form activated species from precursors, then the reactivity of species is improved, but the stability of species deteriorates as they are short-lived and recombine before reaching the substrate
Solution Approach 1:
The patent introduces an intermediary reaction chamber between the remote plasma source and the substrate. The activated species are generated in the first chamber, then transported through the intermediary second chamber to the substrate. This intermediary space allows the species to maintain their reactive state longer by controlling conditions (pressure, temperature, gas composition) that prevent premature recombination, thus resolving the contradiction between high reactivity and short lifetime
Solution Approach 2:
The system performs preliminary action by generating the activated species in advance in the remote plasma source before they reach the substrate. The species are created in a controlled environment with optimized parameters (pressure, gas flow, plasma power) that extend their lifetime, allowing them to be transported over a distance without losing their reactive properties. This preliminary formation and stabilization resolves the contradiction by ensuring species are both highly reactive and sufficiently stable during transport
2Duration of action of stationary object
If a direct plasma system is used to form activated species within the reaction chamber, then the stability of species is improved, but harmful factors worsen due to surface damage to the substrate
Solution Approach 1:
The patent divides the plasma processing system into two separate chambers: a remote plasma source chamber where activated species are generated, and a reaction chamber where the substrate is processed. This segmentation physically separates the plasma generation zone from the substrate, eliminating direct plasma exposure and its associated surface damage while still delivering stable activated species to the substrate for controlled reactions
Solution Approach 2:
The transport region between the remote plasma source and substrate acts as an intermediary medium. Activated species are formed in the remote plasma, then travel through this intermediary space under controlled conditions (low pressure, specific gas composition) that maintain their stability without requiring direct plasma contact with the substrate, thus preventing surface damage while preserving species stability
3Manufacturing precision
If precursors with better properties (higher selectivity, reactivity, uniform deposition) are selected, then manufacturing precision is improved, but cost and toxicity worsen
Solution Approach 1:
The patent changes the parameters of the plasma environment (pressure, temperature, gas composition, plasma power) to enable the formation of stable activated species from conventional, cost-effective precursors. By optimizing these parameters in the remote plasma source and transport region, the system achieves high reactivity and uniformity typically associated with expensive precursors, but using cheaper, less toxic materials thus resolving the contradiction between manufacturing precision and precursor cost/toxicity
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 system provides a steady-state source of stable intermediate reactive species, enhancing the uniformity and reactivity of reactants, reducing substrate damage, and allowing the use of safer, less expensive precursors with superior properties, thereby improving the efficiency and effectiveness of vapor-phase processes.
Implementation Method 1
Remote or direct plasma systems may be used to create activated or energized species from a precursor, where the energized species are more reactive than the precursor for a given temperature.
Implementation Method 2
a pressure control device in fluid communication with and interposed between the remote plasma unit and the vacuum source, wherein the pressure control device controls an operating pressure of the remote plasma unit
Implementation Method 3
The system may also include a catalyst between the remote plasma unit and the reaction chamber (and optionally the vacuum source) to facilitate formation of desired intermediate reactants
Data Source
AI summary
A system and method for providing intermediate reactive species from a remote plasma unit to a reaction chamber are disclosed. The system includes a pressure control device to control a pressure at the remote plasma unit as intermediate reactive species from the remote plasma unit are provided to the reaction chamber.