Metal Chalcogenide Thin Films With In-Plane Composition Gradients
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Solution Overview
Problem
Existing methods for manufacturing metal chalcogenide thin films lack the capability to produce films with uniform compositional variations across large areas, which are necessary for applications in semiconductor devices and optical sensors.
Innovation Solution
A method involving a confined reaction space is used to deposit transition metal and chalcogen precursors on a substrate, creating an in-plane composition gradient by controlling the concentration of these precursors, which is then heat-treated to form the metal chalcogenide thin film.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If conventional methods are used to manufacture metal chalcogenide thin films, then uniform composition can be achieved, but compositional variations necessary for wavelength analysis and optical sensing cannot be produced
Solution Approach 1:
The patent applies local quality by creating spatially varying precursor concentrations during film deposition. Different regions of the substrate receive different amounts of metal and chalcogen precursors, resulting in local compositional variations. This enables the film to have different bandgaps in different regions, allowing wavelength analysis and optical sensing applications while maintaining controlled composition gradients.
Solution Approach 2:
The patent changes the concentration parameters of metal and chalcogen precursors during the deposition process. By varying precursor concentrations across the substrate surface and controlling deposition conditions, the method achieves controlled compositional variations in the thin film, enabling tunable optical properties for different applications.
2Adaptability or versatility
If compositional variations are introduced to enable wavelength analysis, then optical sensing capability is improved, but manufacturing complexity increases
Solution Approach 1:
The patent performs preliminary action by establishing the desired compositional gradient through precursor concentration control during deposition. The concentration gradients of metal and chalcogen precursors are pre-designed to achieve the target bandgap distribution, eliminating the need for complex post-deposition processing or multiple deposition steps, thus simplifying the overall manufacturing process.
3Productivity
If large area coverage is achieved for device applications, then productivity is improved, but maintaining compositional gradients across the area becomes difficult
Solution Approach 1:
The patent creates a universal deposition method that simultaneously achieves large area coverage and controlled compositional gradients. The confined reaction space design with controlled precursor delivery enables single-step deposition of gradient films over large substrate areas, making the process scalable and suitable for practical device manufacturing without requiring multiple processing steps.
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 allows for the production of metal chalcogenide thin films with controlled bandgap characteristics, enabling their use in various electronic devices such as optical wavelength sensors and flexible transistor devices.
Implementation Method 1
providing a transition metal precursor and a chalcogen precursor on a substrate by using a confined reaction space
Implementation Method 2
at least one of the transition metal precursor and the chalcogen precursor forms a concentration gradient according to a position on a surface of a substrate
Implementation Method 3
heat treating the confined reaction space
Data Source
AI summary
Provided are a metal chalcogenide thin film and a method and device for manufacturing the same. The metal chalcogenide thin film includes a transition metal element and a chalcogen element, and at least one of the transition metal element and the chalcogen element having a composition gradient along the surface of the metal chalcogenide thin film, the composition gradient being an in-plane composition gradient. The metal chalcogenide thin film may be prepared by using a manufacturing method including providing a transition metal precursor and a chalcogen precursor on a substrate by using a confined reaction space in such a manner that at least one of the transition metal precursor and the chalcogen precursor forms a concentration gradient according to a position on the surface of the substrate; and heat-treating the substrate.