Remote Epitaxy with 2D Interlayers for Low-Defect Compound Semiconductors
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Solution Overview
Problem
The existing methods for growing high-quality III-Nitride epitaxial layers face contamination and defects due to exposure to chemicals during the transfer of 2D interlayers, which compromises the quality of the resulting semiconductor surfaces.
Innovation Solution
Direct growth of amorphous, polycrystalline, or single crystal 2D material interlayers on III-Nitride and III-V substrates allows for contamination-free epitaxial layer formation without growth interruption, using techniques like Molecular Beam Epitaxy (MBE) or Metal Organic Chemical Vapor Deposition (MOCVD), reducing defects and processing time.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If 2D interlayers are transferred using existing methods, then the transfer process can be completed, but contamination and defects occur due to exposure to chemicals
Solution Approach 1:
The patent introduces a sacrificial layer as an intermediary between the 2D interlayer and the substrate. This sacrificial layer enables the transfer process while protecting the 2D interlayer from direct chemical exposure. The sacrificial layer is selectively removed after transfer, achieving the transfer goal without the harmful chemical contamination that would otherwise occur during direct handling and transfer of the 2D interlayer.
2Productivity
If conventional epitaxial growth methods are used, then epitaxial layers can be grown, but growth interruption occurs during 2D interlayer transfer
Solution Approach 1:
The patent performs preliminary actions by growing the 2D interlayer and sacrificial layer structure in-situ within the epitaxial reactor before the main epitaxial layer growth. This preliminary structuring is completed while maintaining vacuum or controlled atmosphere conditions, so that when the main epitaxial growth begins, no further interruptions are needed for interlayer transfer. The transfer preparation is done in advance under compatible conditions.
Solution Approach 2:
The patent enables continuous epitaxial growth by integrating the 2D interlayer formation and transfer process into the continuous epitaxial growth sequence. The sacrificial layer approach allows the epitaxial reactor to maintain its environment and continue growth operations without breaking vacuum or exposing samples to atmospheric conditions, thereby maintaining continuous useful action throughout the process.
3Adaptability or versatility
If multiple transfer steps are used for 2D interlayers, then complex device structures can be achieved, but processing complexity increases
Solution Approach 1:
The patent merges the 2D interlayer transfer process with the epitaxial growth process into a single integrated workflow. Instead of separate transfer operations requiring different equipment and atmospheric conditions, the sacrificial layer method combines transfer and growth in one continuous epitaxial process, reducing the number of discrete processing steps while maintaining the ability to create complex device structures.
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 method enables the fabrication of high-quality III-Nitride epitaxial layers with reduced defects and contamination, improving electronic properties and facilitating high-volume production by minimizing surface impurities and processing complexity.
Implementation Method 1
molecular beam epitaxy (MBE) is popular because MBE can control the thickness of the epitaxial layer to within monolayers
Implementation Method 2
The MOCVD process deposits very thin layers of atoms onto a semiconductor wafer
Implementation Method 3
Hydride Vapor Phase Epitaxy (HVPE) is an epitaxial growth technique that forms semiconductors such as gallium nitride GaN, gallium arsenide GaAs, indium phosphide InP and other related compounds, by reacting hydrogen chloride at an elevated temperature with group-III metals in order to produce gaseous metal chlorides. The gaseous metal chlorides are reacted with ammonia to produce III-Nitrides
Data Source
AI summary
Amorphous, polycrystalline, or single crystal 2D material interlayers are directly grown on the surface of bulk compound semiconductors (III-Nitride, III-V, II-VI, SiC, Silicon, Sapphire, complex oxides, or other oxides, etc) substrate or buffer layered substrates (III-Nitride, III-V, II-VI, SiC, Silicon nitride (SiN), complex oxides, or other oxides, etc), facilitating low contamination III-Nitride, III-V, II-VI, complex oxides, or other oxides epitaxial layer on templates without growth interruption through Molecular Beam Epitaxy (MBE), Metal Organic Chemical Vapor Deposition (MOCVD), Hydride Vapor Phase Epitaxy (HVPE), or other tools. This growth process reduces defects hindering the control of electronic properties of semiconductor epilayers, reduces processing time, and reduces materials cost by reusing the high-cost III-N, III-V, II-VI, SiC, Silicon nitride (SiN), complex oxides, or other oxides templates multiple times after the lift-off process.