Resistive Field Structures for GaN Transistor Breakdown Voltage
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Solution Overview
Problem
Modern high voltage transistors face challenges in achieving uniform electric field distribution, leading to excessive current flow and limited breakdown voltage due to non-uniform charge distribution and HEMT architecture, which restricts their scalability and reliability in high voltage applications.
Innovation Solution
The implementation of resistive field structures, such as resistive field cages and plates, which utilize highly resistive materials to modulate electric field profiles and control the distribution of electric fields within semiconductor devices, allowing for independent adjustment of field characteristics and improved breakdown voltage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional conductive field plates are used to control electric field distribution, then the maximum electric field can be reduced for given device dimensions, but the structure is limited by physical scalability issues and cannot provide independent control over field characteristics
Solution Approach 1:
The patent changes the fundamental parameter of the field structure from conductive to resistive material. The resistive field structure allows independent control of electric field characteristics through material property selection rather than relying on geometric variations, enabling versatile field control without physical scalability limitations
Solution Approach 2:
The patent employs composite material structures combining resistive materials with semiconductor layers. This composite approach enables both field control functionality and material property tuning, achieving improved breakdown voltage while maintaining design flexibility through material composition rather than geometric constraints
2Stability of the object's composition
If horizontal spacing between field plates is decreased to enhance field sharing, then field distribution improves, but electric field peaks near the gate increase
Solution Approach 1:
The resistive field structure implements local quality control by allowing different regions of the field structure to have different resistive properties. This enables tailored electric field distribution where specific regions can be optimized to reduce peaks near the gate while maintaining overall uniformity, without being constrained by uniform geometric spacing
3Stability of the object's composition
If vertical spacing of field plates is increased to achieve more uniform electric field, then field distribution improves, but the structure cannot be accommodated within small height from device surface
Solution Approach 1:
The patent transitions from vertical spacing control to lateral/resistive property control for achieving field uniformity. By using resistive materials with tailored properties in a lateral configuration, the structure achieves uniform electric field distribution without requiring large vertical dimensions, thus accommodating small device heights
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
These structures enhance the uniformity of electric field distribution, increase maximum breakdown voltage, and improve the reliability and scalability of semiconductor devices, particularly in high voltage applications, by minimizing power dissipation and reducing switching losses.
Implementation Method 1
described herein are a number of electric-field-control methods in lateral GaN-based power transistors for enhanced breakdown voltage and improved reliability. In one embodiment, the resistive field structure is a field cage, which in turn employs a multi-contact voltage-distributed field control scheme.
Data Source
AI summary
The present disclosure relates to resistive field structures that provide improved electric field profiles when used with a semiconductor device. In particular, the resistive field structures provide a uniform electric field profile, thereby enhancing breakdown voltage and improving reliability. In example, the structure is a field cage that is configured to be resistive, in which the potential changes significantly over the distance of the cage. In another example, the structure is a resistive field plate. Using these resistive field structures, the characteristics of the electric field profile can be independently modulated from the physical parameters of the semiconductor device. Additional methods and architectures are described herein.