III-V Mesa Interface Structure for Parasitic Channel Suppression
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Solution Overview
Problem
Parasitic conductive channels in III-V semiconductor devices, such as GaN-based transistors, lead to RF losses and performance limitations due to the formation of parasitic electron or hole channels at the interface between the semiconductor and the substrate or insulating material.
Innovation Solution
A parasitic channel suppression region is created using a highly resistive, amorphous, polycrystalline, or high-defect density layer at the interface between the III-V semiconductor and the substrate or insulating material, reducing charge mobility and density to prevent the formation of parasitic channels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a III-V semiconductor device is fabricated on a substrate or insulating material, then the device can achieve high current carrying capacity and low on-resistance, but parasitic conductive channels form at the interface causing RF losses and performance degradation
Solution Approach 1:
A parasitic channel suppression region is introduced as an intermediary layer between the III-V semiconductor and the substrate or insulating material. This suppression region acts as a mediator that prevents the formation of parasitic conductive channels at the interface, thereby eliminating RF losses while maintaining the beneficial electrical properties of the III-V semiconductor device
Solution Approach 2:
The harmful parasitic conductive channels are extracted or removed from the system by introducing the parasitic channel suppression region. This suppression region selectively eliminates the parasitic channels at the interface without affecting the main current-carrying channels, thus improving device performance by removing the harmful factor
2Loss of energy
If the interface between III-V semiconductor and substrate is left untreated, then fabrication is simpler, but parasitic channels form causing energy loss
Solution Approach 1:
The parasitic channel suppression region serves as an intermediary layer that addresses the interface problem without requiring complete redesign of the device structure. This intermediate layer specifically targets and suppresses parasitic channels while maintaining overall structural simplicity
Solution Approach 2:
The parasitic channel suppression region is applied locally only at the interface where parasitic channels form, rather than throughout the entire device. This localized approach reduces energy losses at the critical interface region while minimizing additional device complexity
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 approach increases drain efficiency by 4 to 5% by inhibiting current flow through parasitic channels, thereby reducing RF losses and improving the overall performance of the semiconductor device.
Implementation Method 1
A parasitic channel suppression region is created using a highly resistive, amorphous, polycrystalline, or high-defect density layer at the interface between the III-V semiconductor and the substrate or insulating material, reducing charge mobility and density to prevent the formation of parasitic channels
Data Source
AI summary
A semiconductor device includes a support substrate having a first surface capable of supporting the epitaxial growth of at least one III-V semiconductor and a second surface opposing the first surface, at least one mesa positioned on the first surface, each mesa including an epitaxial III-V semiconductor-based multi-layer structure on the first surface of the support substrate, the III-V semiconductor-based multi-layer structure forming a boundary with the first surface and a parasitic channel suppression region positioned laterally adjacent the boundary.