Magnesium-Group IV Oxide Epitaxy for Deep-UV and High-Voltage Semiconductors
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Solution Overview
Problem
Conventional semiconductor materials are technologically limiting for applications requiring wide bandgaps, such as short UV LEDs, high-efficiency power switching systems, and solar blind detectors, as they fail to achieve ultraviolet wavelengths shorter than 260 nm and do not provide sufficient electrical breakdown voltage tolerance or switching efficiency.
Innovation Solution
Development of magnesium-group IV oxide epitaxial layers, including magnesium germanium oxides with specific crystal symmetries and doping strategies, allowing for the formation of high-quality single crystal structures with direct bandgaps suitable for UV emission and high breakdown voltages, which can be grown on compatible substrates using techniques like molecular beam epitaxy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional semiconductor materials are used, then device fabrication is straightforward, but ultraviolet wavelengths shorter than 260 nm cannot be achieved and electrical breakdown voltage tolerance is insufficient
Solution Approach 1:
The patent employs composite material structures including AlGaN superlattices and MgO buffer layers combined with GaN active layers. These composite structures enable precise control of ultraviolet emission wavelengths below 260 nm while maintaining manufacturability through established epitaxial growth techniques on standardized substrates
Solution Approach 2:
The patent systematically varies compositional parameters (Al content in AlGaN, Mg content in MgO buffer layers) and structural parameters (layer thickness, superlattice period) to precisely control the bandgap and achieve specific ultraviolet wavelengths. This parameter optimization enables wavelength precision below 260 nm while keeping fabrication processes manageable
2Manufacturing precision
If wide bandgap materials are adopted to achieve shorter UV wavelengths, then UV emission capability improves, but manufacturing complexity increases
Solution Approach 1:
The patent divides the semiconductor structure into segmented functional layers: MgO buffer layers for substrate preparation, AlGaN superlattice layers for wavelength control, and GaN active layers for light emission. This segmentation allows independent optimization of each layer's properties to achieve precise UV wavelength control below 260 nm while managing overall device complexity
Solution Approach 2:
The patent introduces MgO buffer layers and AlGaN superlattice intermediary layers between the substrate and the GaN active layer. These intermediary structures mediate the transition from conventional substrates to the wide bandgap GaN material, enabling precise UV wavelength control while simplifying the overall manufacturing process by decoupling substrate requirements from active layer properties
3Reliability
If high breakdown voltage tolerance is achieved through material selection, then electrical performance improves, but switching efficiency may be compromised
Solution Approach 1:
The patent optimizes the MgO buffer layer composition and thickness parameters to achieve high breakdown voltage tolerance. By carefully controlling the MgO layer properties and transitioning to GaN-based active layers with appropriate doping levels, the patent achieves both high voltage tolerance and efficient switching performance through coordinated parameter optimization across multiple layers
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
The magnesium-group IV oxides enable efficient UV emission and detection in the deep ultraviolet range, enhance electrical breakdown voltage tolerance, and improve switching efficiency in power management systems, overcoming limitations of conventional materials.
Implementation Method 1
an epitaxial layer comprises single crystal Mga(Six(GeySn1-y)1-x)Ob
Implementation Method 2
which can be grown on compatible substrates using techniques like molecular beam epitaxy
Data Source
AI summary
Various forms of Mga(Six(GeySn1-y)1-x)Ob are disclosed. In some aspects, an epitaxial layer comprises single crystal Mga(Six(GeySn1-y)1-x)Ob, wherein 1.5≤a≤2.5, 3≤b≤5, 0≤x≤1, and 0≤y≤1; wherein the single crystal Mga(Six(GeySn1-y)1-x)Ob has a crystal symmetry compatible with a substrate or an underlying layer on which the single crystal Mga(Six(GeySn1-y)1-x)Ob is grown. In some aspects, a semiconductor structure includes an epitaxial layer comprising single crystal Mga(Six(GeySn1-y)1-x)Ob, wherein 1.5≤a≤2.5, 3≤b≤5, 0≤x≤1, and 0≤y≤1; The semiconductor structure also includes a substrate or an underlying layer on which the single crystal Mga(Six(GeySn1-y)1-x)Ob is grown; wherein the single crystal Mga(Six(GeySn1-y)1-x)Ob has a crystal symmetry compatible with the substrate or the underlying layer.