Bidirectional Switch Substrate Potential Stabilizer
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Bidirectional switches formed on conductive substrates, particularly those using silicon semiconductor elements, face instability due to unstable substrate potential, leading to asymmetric potential characteristics and operation instability.
Innovation Solution
A bidirectional switch is designed with a substrate potential stabilizer that sets the substrate potential lower than the higher potential of the ohmic electrodes, using diodes and resistive elements to stabilize the substrate potential, thereby reducing potential asymmetry and ensuring stable operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a bidirectional switch is formed on a conductive substrate (such as Si substrate), then manufacturing cost and ease of manufacture are improved, but substrate potential becomes unstable causing operation instability
Solution Approach 1:
An insulating film is introduced as an intermediary layer between the conductive substrate and the semiconductor multilayer. This insulating film acts as a mediator that electrically isolates the semiconductor structure from the substrate, thereby stabilizing the substrate potential while maintaining the advantage of using a low-cost conductive substrate for manufacturing
2Ease of manufacture
If silicon semiconductor elements are used, then ease of manufacture is improved, but on-resistance cannot be reduced due to material limits
Solution Approach 1:
The patent employs a composite structure combining silicon substrate with advanced semiconductor materials (such as GaN or SiC) in the semiconductor multilayer. This composite approach allows utilizing the manufacturing advantages of silicon substrates while achieving low on-resistance through the superior electrical properties of wide-bandgap semiconductor materials
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 provides a stably operating bidirectional switch by maintaining substrate potential stability, reducing on-resistance, and eliminating the need for additional diodes, thus enhancing the switch's performance and efficiency.
Implementation Method 1
charge is generated at the heterojunction interface between aluminum gallium nitride (AlGaN) and gallium nitride (GaN) due to spontaneous polarization and piezoelectric polarization
Implementation Method 2
charge is generated at the heterojunction interface between aluminum gallium nitride (AlGaN) and gallium nitride (GaN) due to spontaneous polarization and piezoelectric polarization
Implementation Method 3
using diodes and resistive elements to stabilize the substrate potential
Data Source
AI summary
A bidirectional switch includes a semiconductor element and a substrate potential stabilizer. The semiconductor element includes a first ohmic electrode and a second ohmic electrode, and a first gate electrode and a second gate electrode, which are sequentially formed on the first ohmic electrode between the first ohmic electrode and the second ohmic electrode. The substrate potential stabilizer sets a potential of the substrate lower than higher one of a potential of the first ohmic electrode or a potential of the second ohmic electrode.