Strained-Layer Semiconductor Structure for 2DEG Conductivity
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Solution Overview
Problem
Semiconductor devices with direct bandgap semiconductors, such as group III-V materials, face challenges in optimizing performance under varying conditions due to limitations in stress management and electron concentration in two-dimensional electron gas (2DEG) regions, leading to suboptimal conductivity and reliability.
Innovation Solution
A semiconductor device structure incorporating a substrate, channel layer, barrier layer, gate, strained layer, and passivation layer, where the strained layer is disposed on the barrier layer to impose tensile stress on the channel layer, enhancing electron concentration and polarization, and the passivation layer differs in material from the strained layer to improve device reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a strained layer is formed on the barrier layer to enhance electron concentration and polarization, then device performance and reliability are improved, but device complexity and manufacturing process complexity increase
Solution Approach 1:
The patent segments the device structure by introducing a distinct strained layer between the barrier layer and channel layer. This segmentation allows independent optimization of stress management and electron concentration functions, improving reliability without overwhelming complexity through modular design
Solution Approach 2:
The strained layer is selectively positioned at specific locations (between barrier layer and channel layer) where stress application is most effective for enhancing electron concentration. This local quality approach targets performance improvement precisely where needed, avoiding unnecessary complexity in other device regions
2Reliability
If the strained layer is optimized through patterning and thickness control to reduce on-resistance, then electrical conductivity is improved, but manufacturing precision requirements increase
Solution Approach 1:
The patent optimizes conductivity by controlling specific parameters of the strained layer including its thickness, composition, and stress state. By adjusting these parameters within defined ranges, the patent achieves reduced on-resistance while maintaining manufacturability through standardized process controls
Solution Approach 2:
The strained layer is formed with predetermined thickness and composition characteristics before subsequent device fabrication steps. This preliminary action establishes the stress and electron concentration conditions needed for optimal conductivity, simplifying later manufacturing steps rather than requiring high-precision adjustments during final assembly
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 strained layer modifies stress on the channel layer, increasing electron concentration in the 2DEG region, reducing on-resistance, and optimizing device reliability by patterning and thickness control, thereby enhancing the semiconductor device's performance and process window.
Implementation Method 1
the strained layer is disposed on the barrier layer to impose tensile stress on the channel layer, enhancing electron concentration and polarization
Data Source
AI summary
A semiconductor device includes a substrate, a channel layer, a barrier layer, a gate, a strained layer and a passivation layer. The channel layer is disposed on the substrate. The barrier layer is disposed on the channel layer. The gate is disposed on the barrier layer. The strained layer is disposed on the barrier layer. The passivation layer covers the gate and the strained layer. The material of the passivation layer differs from that of the strained layer.