Thin Film Deposition Apparatus with Segmented Gas Flow Control
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Solution Overview
Problem
Conventional thin film deposition apparatuses struggle to achieve commercially viable deposition rates and desired properties, particularly in on-line coating processes for glass substrates, where high temperatures and short chemical reaction times are required, and off-line sputtering processes result in more complex but expensive films.
Innovation Solution
The apparatus maintains discrete gaseous reactant flow paths to ensure reactants mix and react at the substrate surface, using slot-like outlet openings and gas flow conditioning devices to control turbulence and uniformity, allowing for rapid and uniform film deposition at high rates suitable for solar control and conductive coatings.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional on-line deposition apparatus are used, then deposition can occur during glass manufacturing, but deposition rates are insufficient for commercial viability
Solution Approach 1:
The apparatus segments the gas delivery system into multiple discrete slot-like outlets arranged in arrays, with each slot delivering reactants through controlled flow pathways. This segmentation enables precise control of reactant distribution across the substrate surface, achieving both high deposition rates and uniform film quality simultaneously
Solution Approach 2:
The invention changes the physical parameters of gas delivery by using slot-like outlets with specific dimensions and arrangements, controlling flow rates and velocities to optimize the balance between deposition rate and film uniformity. Temperature parameters are also controlled to achieve rapid deposition while maintaining film quality
2Reliability
If off-line sputter coating processes are used, then complex film stacks with superior properties can be deposited, but production cost increases significantly
Solution Approach 1:
The invention replaces the mechanical sputtering process with a chemical vapor deposition process using controlled reactant gas flows. This substitution eliminates the need for vacuum systems and target materials required in sputtering, significantly reducing equipment complexity and production costs while achieving comparable or superior film properties through chemical reactions at the substrate surface
Solution Approach 2:
The invention changes the deposition mechanism from physical sputtering to chemical vapor deposition, altering the fundamental parameters of the process. By controlling temperature, gas flow rates, and reactant concentrations, the process achieves complex film stacks with desired properties at lower costs than sputtering
3Productivity
If reactant gases are delivered without discrete flow paths, then deposition can occur, but pre-reaction of reactants reduces deposition efficiency
Solution Approach 1:
The apparatus uses segmented discrete flow pathways that keep different reactant gases separated until they reach the substrate surface. Each slot-like outlet has dedicated flow paths that prevent premature mixing, ensuring reactants remain separate during delivery and only react at the deposition zone, maximizing deposition efficiency
Solution Approach 2:
The slot-like outlets and flow pathways act as intermediaries that control and manage the delivery of reactant gases. These structures provide controlled environments that prevent pre-reaction while enabling efficient transport of reactants to the substrate surface where deposition occurs
4Productivity
If high deposition rates are achieved, then commercial viability is possible, but film uniformity deteriorates
Solution Approach 1:
The segmented array of slot-like outlets distributes reactants uniformly across the substrate surface, with each slot contributing to a specific region. This segmented delivery system maintains consistent reactant flux across the entire substrate even at high deposition rates, ensuring uniform film thickness and properties throughout
Solution Approach 2:
The invention optimizes multiple parameters including slot dimensions, spacing, gas flow rates, and substrate temperature to achieve the optimal balance between high deposition rate and film uniformity. By carefully controlling these parameters, the process maintains manufacturing precision while achieving commercially viable productivity
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 production of thin films at commercially viable rates, exceeding 5 nm/sec, with excellent uniformity and desired properties for solar control and transparent conductive coatings, while preventing pre-reaction and maintaining thermal stability.
Implementation Method 1
chemical vapor deposition, most preferably by atmospheric chemical vapor deposition
Implementation Method 2
establishing a second flow of a second reactant gas as a turbulent flow at an angle to the glass surface
Implementation Method 3
Gas flow conditioning devices are placed in one or more of the flow paths between the at least one gaseous reactant inlet opening and the at least one gaseous reactant outlet opening
Data Source
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AI summary
The invention relates to an apparatus for depositing thin film coatings on a substrate. The deposition apparatus is designed to keep gaseous reactant materials to be deposited apart from one another in the deposition apparatus, by one or more separation devices and/or methods, but nevertheless, to allow the chemical reactants to mix and react at or near the substrate surface, rapidly enough to create a uniform film at commercially viable deposition rates.