Metallo-Semiconductor Epitaxy for Low-Defect III-Nitride Devices
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Solution Overview
Problem
Existing III-nitride semiconductor devices face challenges in achieving high-quality semiconductor/metal/semiconductor epitaxial structures, leading to issues such as cracking, dislocations, and inefficient performance, particularly in metal-base transistors, which are commercially unavailable due to fabrication difficulties.
Innovation Solution
The development of metallo-semiconductor structures with alternating layers of lattice-matched metal and semiconductor materials, forming epitaxial metallo-semiconductor devices that reduce cracking and dislocations, enabling improved crystal quality and device performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional semiconductor/metal/semiconductor epitaxial structures are used, then device fabrication can proceed with conventional methods, but cracking and dislocations occur leading to poor device performance
Solution Approach 1:
The patent introduces an intermediary metallo-semiconductor layer structure between the semiconductor layers that acts as a mediator to reduce lattice mismatch and thermal stress. This intermediate structure prevents direct contact between mismatched semiconductor layers, thereby eliminating cracking and dislocations while maintaining device performance.
Solution Approach 2:
The patent employs composite metallo-semiconductor structures combining metal and semiconductor materials with complementary properties. The composite structure leverages the mechanical strength and lattice-matching capabilities of metal layers to support the semiconductor layers, preventing defect formation while enabling high-quality epitaxial growth.
2Manufacturing precision
If high-quality epitaxial structures are achieved through conventional means, then device performance improves, but manufacturing complexity and difficulty increase
Solution Approach 1:
The patent modifies key material parameters including lattice constant matching, thermal expansion coefficients, and layer thickness ratios in the metallo-semiconductor structure. By carefully selecting and adjusting these parameters, the patent achieves high-quality epitaxial growth with reduced manufacturing complexity compared to conventional approaches.
3Productivity
If metal-base transistors are fabricated with traditional structures, then commercial availability can be achieved, but device efficiency and performance remain insufficient
Solution Approach 1:
The patent segments the transistor structure into distinct metallo-semiconductor layers with specialized functions. This segmentation allows each layer to be optimized independently for its specific role (conduction, insulation, active region), improving overall device efficiency while maintaining fabrication feasibility through modular construction.
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 proposed structures enhance the crystal quality of epitaxial materials on non-native substrates, leading to improved performance and efficiency of III-nitride-based semiconductor devices, including metal-base transistors, by reducing defects and enabling higher reflectivity and transparency.
Implementation Method 1
epitaxially grown metal-containing layers
Implementation Method 2
alternating layers of lattice-matched metal and semiconductor materials
Implementation Method 3
enabling higher reflectivity and transparency
Data Source
AI summary
The present invention provides materials, structures, and methods for III-nitride-based devices, including epitaxial and non-epitaxial structures useful for III-nitride devices including light emitting devices, laser diodes, transistors, detectors, sensors, and the like. In some embodiments, the present invention provides metallo-semiconductor and/or metallo-dielectric devices, structures, materials and methods of forming metallo-semiconductor and/or metallo-dielectric material structures for use in semiconductor devices, and more particularly for use in III-nitride based semiconductor devices. In some embodiments, the present invention includes materials, structures, and methods for improving the crystal quality of epitaxial materials grown on non-native substrates. In some embodiments, the present invention provides materials, structures, devices, and methods for acoustic wave devices and technology, including epitaxial and non-epitaxial piezoelectric materials and structures useful for acoustic wave devices. In some embodiments, the present invention provides metal-base transistor devices, structures, materials and methods of forming metal-base transistor material structures for use in semiconductor devices.