Metastable Radical Surface Activation for Monolayer Oxidation Control
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Solution Overview
Problem
Conventional substrate processing methods face challenges in achieving precise control over feature sizes below 10 nm, particularly in oxidation processes where variations in oxidation thickness occur due to surface conditions, leading to uncontrolled oxidation and damage to sensitive surfaces.
Innovation Solution
A method involving the use of metastable activated radical species, such as helium radicals, to create an adsorption layer on the substrate surface, followed by plasma activation to achieve controlled monolayer oxidation or etching, minimizing diffusion and ion damage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional oxidation methods are used to treat substrate surfaces, then oxidation treatment can be performed, but oxidation thickness varies due to surface conditions (smooth vs. rough, porous vs. less porous) leading to poor manufacturing precision
Solution Approach 1:
The invention changes the fundamental parameters of the oxidation process by using metastable activated radical species instead of conventional thermal or plasma oxidation. This transformation allows oxidation to proceed through a different mechanism that is insensitive to surface morphology variations, achieving uniform oxidation thickness control regardless of whether the surface is smooth, rough, porous or less porous.
Solution Approach 2:
The invention replaces conventional thermal oxidation mechanisms with a radical-based chemical mechanism. By introducing metastable activated radical species, the oxidation process transitions from being thermally-driven and surface-condition-dependent to being radical-driven and surface-condition-independent, thereby improving manufacturing precision.
2Productivity
If conventional plasma oxidation is used, then oxidation can be performed, but ion damage occurs to sensitive surfaces
Solution Approach 1:
The invention extracts and removes the harmful ion component from the plasma oxidation process. By using a specific plasma configuration that generates metastable activated radical species without significant ion flux, the harmful ion damage is taken out while retaining the beneficial oxidation capability, thus protecting sensitive surfaces from damage.
Solution Approach 2:
The invention introduces metastable activated radical species as an intermediary that mediates the oxidation process. These radical species serve as the active oxidizing agents without requiring high-energy ions, thereby enabling oxidation treatment while avoiding ion damage to the substrate surface.
3Quantity of substance
If oxidation is performed to increase thickness, then more material is deposited, but surface uniformity deteriorates due to diffusion and loading effects
Solution Approach 1:
The invention applies preliminary action by first forming a complete monolayer of oxidation before any diffusion or loading effects can occur. The metastable activated radical species react rapidly and uniformly across the entire substrate surface, completing the oxidation in a single atomic layer before subsequent layers are formed, thereby maintaining surface uniformity throughout the thickening process.
Solution Approach 2:
The invention employs periodic action by repeating the monolayer formation process in controlled cycles. Each cycle deposits one complete atomic layer uniformly across the surface, and by repeating this process, precise thickness control is achieved while maintaining surface uniformity, as each layer is formed under identical uniform conditions.
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
Enables precise control over oxidation or etching at a monolayer level, ensuring uniformity and minimizing substrate damage, with reduced sensitivity to surface variations and loading effects.
Implementation Method 1
purging a first chamber and a second chamber of a substrate processing system using a purge gas
Implementation Method 2
flowing a treatment gas to the second chamber but not the first chamber to create an adsorption layer on a surface of a substrate
Implementation Method 3
striking plasma in the first chamber to create metastable active radical species
Implementation Method 4
create metastable active radical species
Implementation Method 5
surface activate the adsorption layer
Implementation Method 6
oxidation or etching with monolayer control
Data Source
AI summary
A method for treating an exposed surface of a substrate includes purging first and second chambers of a substrate processing system using a purge gas. A gas distribution device is arranged between the first chamber and the second chamber. The method includes flowing a treatment gas to the second chamber but not the first chamber to create an adsorption layer on a surface of a substrate arranged on a substrate support in the second chamber. The method includes stopping flow of the treatment gas to the second chamber. The method includes flowing the purge gas to purge the first chamber and the second chamber. The method includes, while flowing the purge gas to the first chamber, striking plasma in the first chamber to create metastable active radical species and delivering the metastable active radical species through the gas distribution device to the second chamber to surface activate the adsorption layer.