Vapour Deposition Process for Chemical Compound Composition Control
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Solution Overview
Problem
Conventional methods for preparing thin film chemical compounds often result in composition discrepancies due to preferential evaporation of components from solid targets, making it difficult to control and reproduce the exact composition of deposited thin films.
Innovation Solution
A vapour deposition process where each component element of the chemical compound is provided as a vapour and co-deposited on a substrate using a cracking source, plasma source, and effusion cell or electron beam evaporator, allowing for precise control of stoichiometry and composition by controlling the deposition rates of each element.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional sputtering or evaporation methods using pre-prepared solid targets are used, then the deposition process is relatively simple and straightforward, but the deposited thin film has different composition from the target due to preferential evaporation of some components, making it difficult to control the exact composition
Solution Approach 1:
The invention segments the deposition process by providing each component element of the chemical compound separately as a vapour from independent sources, rather than using a pre-prepared solid target. This allows each element's deposition rate to be controlled independently, preventing preferential evaporation and enabling precise composition control of the deposited thin film.
Solution Approach 2:
The invention changes the physical state parameter of the component elements from solid (in pre-prepared targets) to vapour phase. By providing each component element as a vapour, the deposition process achieves better compositional control while managing the complexity through parameter optimization of vapour deposition rates.
2Manufacturing precision
If multiple component elements are co-deposited from vapour sources, then precise control of stoichiometry and composition is achieved, but the process complexity increases due to multiple vapour sources and rate control mechanisms
Solution Approach 1:
The invention merges multiple vapour deposition processes into a single co-deposition operation where component elements from different vapour sources are deposited simultaneously onto the same substrate. This combining approach achieves precise stoichiometry control while managing overall process complexity through integrated deposition.
Solution Approach 2:
The invention implements feedback control mechanisms to monitor and adjust the deposition rates of each component element vapour source. This feedback system ensures precise stoichiometry control by continuously optimizing the deposition process based on real-time measurements of film composition and deposition rates.
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 process enables the reliable and reproducible preparation of chemical compounds with controlled composition, minimizing vapour-phase interactions and ensuring that the chemical compound forms on the substrate surface, thereby overcoming the limitations of conventional techniques.
Implementation Method 1
the vapour of at least one component element is provided using a cracking source; the vapour provided using a cracking source is selected from cracked phosphorus, cracked sulphur, cracked arsenic, cracked selenium, cracked antimony and cracked tellurium
Implementation Method 2
the vapour of at least one other component element is provided using a plasma source; the at least one other component element provided using a plasma source is selected from oxygen, nitrogen and hydrogen
Implementation Method 3
the at least one further component element vapour is provided using an effusion cell source or using an electron beam evaporator source
Implementation Method 4
the component elements react on the substrate to form the chemical compound
Implementation Method 5
A vapour deposition process where each component element of the chemical compound is provided as a vapour and co-deposited on a substrate
Data Source
AI summary
A vapor deposition process for the preparation of a chemical compound, wherein the process comprises providing each component element of the chemical compound as a vapor, and co-depositing the component element vapors on a common substrate, wherein: the vapor of at least one component element is provided using a cracking source; the vapor of at least one other component element is provided using a plasma source; and at least one further component element vapor is provided; wherein the component elements react on the substrate to form the chemical compound.