III-V MOSFET Channel Layer Formation via Seed Component Patterning
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Solution Overview
Problem
The fabrication of defect-free III-V metal-oxide-semiconductor field effect transistors (MOSFETs) is challenging due to the complexity and expense of buffer layers, and aspect ratio trapping trenches are ineffective in the longer length direction, leading to high defect rates and increased costs.
Innovation Solution
The approach involves patterning seed components with a free surface on an insulator layer above the substrate, allowing the III-V material to be relaxed grown without a thick buffer layer, with defects more likely to form in the seed components rather than the channel area, and then removing these defects to reduce lattice mismatch and defect formation in the channel area.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If buffer layers are used to reduce defects in III-V MOSFETs, then manufacturing precision is improved, but device complexity and fabrication cost increase
Solution Approach 1:
The patent removes the buffer layer from the III-V MOSFET fabrication process entirely. Instead of using buffer layers to manage lattice mismatch, the invention directly grows III-V channel material on silicon substrates using modified epitaxial processes that accommodate the mismatch without requiring intermediate buffer structures, thereby simplifying device complexity while maintaining defect reduction
Solution Approach 2:
The patent changes the growth parameters and conditions of the epitaxial process to enable direct growth of III-V materials on silicon. By adjusting temperature, pressure, and chemical composition parameters during deposition, the process achieves low-defect interfaces without buffer layers, resolving the contradiction between manufacturing precision and device complexity
2Manufacturing precision
If aspect ratio trapping trenches are used to reduce defects, then manufacturing precision is improved in the narrow direction, but productivity decreases due to ineffectiveness in the longer length direction
Solution Approach 1:
The patent eliminates aspect ratio trapping trenches from the fabrication process. By removing this complex structural feature, the invention achieves defect reduction through simpler means (direct epitaxial growth), thereby improving productivity by eliminating unnecessary fabrication steps while maintaining manufacturing precision through the buffer-layer-free growth method
3Reliability
If thick buffer layers are used to prevent defect propagation, then reliability is improved, but loss of substance increases due to material consumption
Solution Approach 1:
The patent removes the thick buffer layer that consumes excessive material. By adopting a buffer-layer-free approach with controlled direct growth, the invention prevents defect propagation through process optimization rather than material consumption, thereby reducing loss of substance while maintaining reliability
Solution Approach 2:
The patent changes the growth parameters to achieve high-quality III-V channel material directly on silicon without thick buffers. By optimizing deposition conditions, temperature profiles, and chemical environments, the process achieves reliable defect-free growth with minimal material consumption, resolving the contradiction between reliability and loss of substance
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 production of III-V MOSFETs with reduced defects and lower fabrication costs by engineering the geometry and free surface area of seed components to produce non-lattice matched materials on the substrate, resulting in improved semiconductor device performance.
Implementation Method 1
a channel area including an III-V material relaxed grown on the insulator layer
Data Source
AI summary
Embodiments herein describe techniques, systems, and method for a semiconductor device. Embodiments herein may present a semiconductor device including a substrate and an insulator layer above the substrate. A channel area may include an III-V material relaxed grown on the insulator layer. A source area may be above the insulator layer, in contact with the insulator layer, and adjacent to a first end of the channel area. A drain area may be above the insulator layer, in contact with the insulator layer, and adjacent to a second end of the channel area that is opposite to the first end of the channel area. The source area or the drain area may include one or more seed components including a seed material with free surface. Other embodiments may be described and/or claimed.