III-V Gate Trench Structure for Low-Resistance p-Type Epitaxy
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Solution Overview
Problem
Current semiconductor devices with III-V compound materials face challenges in enhancing electrical performance and simplifying manufacturing processes, particularly in achieving a p-type doped III-V compound layer with optimal material quality and electrical resistance characteristics.
Innovation Solution
A semiconductor device is designed with a p-type doped III-V compound layer formed in a trench of a III-V compound barrier layer, where the top surface of the p-type doped layer is coplanar with the barrier layer, reducing electrical resistance and allowing for self-aligned epitaxial growth without additional etching, thereby improving material quality and manufacturing efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a p-type doped III-V compound layer is formed in a trench of a III-V compound barrier layer, then the electrical performance is improved by reducing resistance and achieving positive threshold voltage, but the manufacturing process complexity increases due to additional etching and alignment steps
Solution Approach 1:
The gate trench is pre-formed in the III-V compound barrier layer before depositing the p-type doped III-V compound layer. This preliminary action ensures precise positioning and alignment of the doped layer within the trench, eliminating the need for additional alignment steps and reducing manufacturing complexity while maintaining improved electrical performance
Solution Approach 2:
The p-type doping is applied locally only in the gate trench region rather than uniformly across the entire barrier layer. This localized doping approach reduces resistance at the gate interface (improving electrical performance) while minimizing the amount of doped material and processing steps required (reducing manufacturing complexity)
2Ease of manufacture
If the top surface of the p-type doped III-V compound layer is made coplanar with the barrier layer, then material quality is enhanced and manufacturing is simplified, but the epitaxial growth control becomes more difficult
Solution Approach 1:
The gate trench is pre-formed with precise depth control before epitaxial growth of the p-type doped layer. This preliminary trench formation establishes the exact boundary and depth requirements, guiding the subsequent epitaxial process to achieve coplanar surfaces without requiring complex real-time control during growth
Solution Approach 2:
The III-V compound barrier layer serves as an intermediary medium between the substrate and the p-type doped layer. Its uniform thickness and crystalline quality provide a stable foundation that facilitates controlled epitaxial growth of the doped layer, enabling coplanar surfaces to form naturally through the self-organizing nature of epitaxial growth on a high-quality template
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 solution enhances the electrical performance of semiconductor devices by reducing resistance and achieving a positive threshold voltage, while simplifying the manufacturing process by avoiding etching damage and ensuring precise layer formation.
Implementation Method 1
a p-type doped III-V compound layer is formed in a trench of a III-V compound barrier layer
Implementation Method 2
reducing electrical resistance and allowing for self-aligned epitaxial growth
Implementation Method 3
allowing for self-aligned epitaxial growth without additional etching, thereby improving material quality
Data Source
AI summary
A semiconductor device includes a III-V compound semiconductor layer, a III-V compound barrier layer, a gate trench, a p-type doped III-V compound layer, an insulation layer, and a gate electrode. The III-V compound barrier layer is disposed on the III-V compound semiconductor layer. The gate trench is disposed in the III-V compound barrier layer. The p-type doped III-V compound layer is disposed in the gate trench, and a top surface of the p-type doped III-V compound layer and a top surface of the III-V compound barrier layer are substantially coplanar. The insulation layer is disposed on the III-V compound barrier layer. The insulation layer includes an opening located corresponding to the gate trench in a vertical direction. A part of the p-type doped III-V compound layer is disposed on the insulation layer in the vertical direction. The gate electrode is disposed on the p-type doped III-V compound layer.