Semiconductor Field Plate for Group III-V Transistors
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional field plate structures in group III-V transistors suffer from high peak electric fields due to abrupt geometric terminations and high conductivity materials, leading to device leakage currents and reliability degradation, especially in high-voltage applications.
Innovation Solution
A semiconductor field plate is implemented as a thin layer acting as a distributed resistor to evenly distribute the electric field across the transistor structure, inhibiting the formation of electric field peaks and enhancing breakdown capability and reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stress or pressure
If conventional field plate structures with high conductivity materials are used, then the transistor can handle high voltage, but peak electric fields increase causing device leakage currents and reliability degradation
Solution Approach 1:
The patent changes the electrical conductivity parameter of the field plate material from highly conductive (conventional) to semiconductive with controlled carrier concentration (10^16 to 10^19 cm^-3). This parameter modification allows the field plate to distribute electric fields more uniformly, reducing peak fields while maintaining high voltage capability, thus improving device reliability without sacrificing voltage handling capability
Solution Approach 2:
The patent employs composite material structures including semiconductive layers (such as GaN or AlGaN) combined with specific doping profiles to create a field plate with tailored electrical properties. This composite approach enables simultaneous achievement of high voltage capability and reduced peak electric fields, resolving the contradiction between voltage handling and reliability
2Ease of manufacture
If conventional field plate structures with abrupt geometric terminations are used, then the transistor structure is simple to manufacture, but peak electric fields concentrate at termination points causing leakage currents
Solution Approach 1:
The patent implements gradual geometric transitions and curved profiles in the field plate structure instead of abrupt terminations. This curvature principle distributes electric field lines more evenly, preventing concentration at sharp edges and corners, thereby eliminating leakage current paths while maintaining manufacturing feasibility through standard semiconductor fabrication techniques
Solution Approach 2:
The patent applies different structural characteristics to different regions of the field plate: the main body maintains simple geometry for ease of manufacture, while the termination regions incorporate gradual transitions and curved profiles to eliminate field concentration. This localized quality differentiation resolves the contradiction by addressing harmful effects only where they occur without complicating the overall structure
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 semiconductor field plate effectively reduces peak electric fields and improves the long-term reliability of group III-V transistors by distributing the electric field uniformly, thereby enhancing their voltage breakdown characteristics and stability under high-field stress conditions.
Implementation Method 1
A semiconductor field plate is implemented as a thin layer acting as a distributed resistor to evenly distribute the electric field across the transistor structure
Data Source
AI summary
There are disclosed herein various implementations of a group III-V transistor with a semiconductor field plate. Such a group III-V transistor includes a group III-V heterostructure situated over a substrate and configured to produce a two-dimensional electron gas (2DEG). In addition, the group III-V transistor includes a source electrode, a drain electrode, and a gate situated over the group heterostructure. The group III-V transistor also includes an insulator layer over the group III-V heterostructure and situated between the gate and the drain electrode, and a semiconductor field plate situated between the gate and the drain electrode, over the insulator layer.