Thin Film Deposition Stations for Selective ALD Isolation
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Solution Overview
Problem
Current semiconductor fabrication methods face challenges in selectively depositing thin films on substrates with different surfaces using atomic layer deposition (ALD), as existing technologies often result in undesired chemical vapor deposition (CVD) reactions and lack precise control over reactant isolation, leading to reduced selectivity and film quality.
Innovation Solution
A method and apparatus for selective ALD involving two or more stations, where each station provides a distinct reactant in gas isolation from the others, allowing for the sequential and controlled adsorption of reactants on specific substrate surfaces, minimizing CVD reactions and ensuring precise film deposition on one surface relative to another.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple reactants are provided in the same reaction chamber simultaneously, then deposition speed increases, but selectivity between different substrate surfaces deteriorates due to undesired CVD reactions
Solution Approach 1:
The reaction chamber is divided into multiple isolated reaction zones (first reaction zone, second reaction zone, etc.), each capable of independently providing different reactants. This segmentation allows sequential processing of different substrate surfaces with different reactants while preventing cross-contamination and undesired CVD reactions between reactants.
Solution Approach 2:
The patent introduces a spatial dimension of isolation by creating separate reaction zones that are physically separated from each other. Substrates are transferred between these zones in sequence, adding a temporal and spatial dimension to the deposition process that enables selective surface treatment without reactant interference.
2Manufacturing precision
If reactants are isolated in separate stations, then selectivity and film quality improve, but device complexity increases due to multiple stations and transfer mechanisms
Solution Approach 1:
Each reaction zone is designed as a multi-functional unit that can independently provide reactant delivery, substrate processing, and reactant isolation. The zones can be configured to handle different reactant types and processing conditions, reducing the need for additional specialized components and simplifying the overall system architecture.
3Reliability
If sequential processing is used with gas isolation between reactants, then undesired CVD reactions are prevented, but processing time increases
Solution Approach 1:
The system enables continuous processing by having multiple reaction zones ready in advance. While one substrate is being processed in a reaction zone, other zones can be preparing the next batch of reactants or processing additional substrates. This overlapping of operations maintains continuous productive action while preserving the sequential isolation benefits.
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
This approach enables the selective deposition of thin films with high precision and quality, preventing undesired CVD reactions and extending the operational life of reactors by maintaining spatial and temporal separation between reactants, thus achieving highly selective and conformal film growth.
Implementation Method 1
the first reactant reacts preferentially with the first exposed surface relative to the second exposed surface, such that no more than one monolayer of the first reactant is adsorbed on the first exposed surface
Implementation Method 2
contacting the first substrate in the second station with the second reactant and substantially in the absence of the first reactant, such that the second reactant is different from the first reactant, and reacts with the no more than one monolayer of the first reactant on the first exposed surface
Data Source
AI summary
In accordance with some embodiments herein, apparatuses for deposition of thin films are provided. In some embodiments, a plurality of stations is provided, in which each station provides a different reactant or combination of reactants. The stations can be in gas isolation from each other so as to minimize or prevent undesired chemical vapor deposition (CVD) and/or atomic layer deposition (ALD) reactions between the different reactants or combinations of reactants.