GaN E-field Management Layer for High Voltage Breakdown
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Solution Overview
Problem
High voltage semiconductor devices face challenges in managing electric field concentrations, leading to increased complexity and capacitance with conventional field-plate structures, which limits their breakdown voltage and switching frequency.
Innovation Solution
A semiconductor device with an E-field management layer, comprising nitride semiconductor compounds or conductive oxides, is introduced to reduce electric-field gradients between active layers, incorporating an injection electrode and dielectric layers to manage electric fields and control leakage current.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional field-plate structures are used to reduce electric field concentration, then breakdown voltage is improved, but device complexity and capacitance increase
Solution Approach 1:
The device is divided into multiple active layers (first active layer, second active layer) with a conductive channel extending between them. The E-field management layer is segmented to be disposed over specific regions (over the second active layer and extending laterally), creating a structured approach to field management that reduces complexity compared to multiple discrete field-plates
Solution Approach 2:
The invention transitions from managing electric fields in a single plane to three-dimensional field management across multiple active layers. The E-field management layer extends laterally over the second active layer and into regions above the conductive channel, creating vertical and lateral field control that reduces the number of components needed
2Reliability
If conventional field-plate structures are used to reduce electric field concentration, then breakdown voltage is improved, but switching frequency decreases due to increased capacitance
Solution Approach 1:
The E-field management layer is strategically segmented to cover only the regions where field management is needed (over the second active layer and extending laterally), rather than using extensive field-plate structures that would increase capacitance. This selective placement maintains high breakdown voltage while minimizing capacitive effects
Solution Approach 2:
The invention uses vertical layering with the E-field management layer disposed over the second active layer and extending into the region above the conductive channel. This three-dimensional configuration provides effective field management with reduced lateral extension, thereby reducing capacitance and enabling higher switching frequencies
3Reliability
If the number of field-plates is increased to reduce electric field concentration, then breakdown voltage is improved, but manufacturing difficulty increases
Solution Approach 1:
The device structure is segmented into distinct layers (substrate, first active layer, second active layer, E-field management layer) that can be fabricated using standard semiconductor layering techniques. The E-field management layer is formed as a continuous or partially continuous structure over specific regions, which is more manufacturable than placing multiple discrete field-plates
Solution Approach 2:
The E-field management layer serves multiple functions simultaneously: it manages electric fields to prevent breakdown, provides lateral extension for field control, and can be integrated with the existing active layer structure. This multi-functionality reduces the need for additional specialized components, simplifying manufacturing
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 E-field management layer effectively reduces electric-field gradients, enhancing the breakdown voltage and switching frequency of high voltage semiconductor devices by uniformly distributing electric fields and controlling leakage current.
Implementation Method 1
The E-field management layer, which reduces the electric-field gradients arising in the first and second active layers
Implementation Method 2
The injection electrode is electrically connected to the E-field management layer
Data Source
AI summary
A semiconductor device includes a substrate, a first active layer, a second active layer, at least first and second electrodes, an E-field management layer, and at least one injection electrode. The first active layer is disposed over the substrate. The second active layer is disposed on the first active layer such that a laterally extending conductive channel arises which extends in a lateral direction. The laterally extending conductive channel is located between the first active layer and the second active layer. The first and second electrodes are electrically connected to the first active layer. The E-field management layer, which reduces the electric-field gradients arising in the first and second active layers, is disposed over the second active layer. The injection electrode is electrically connected to the E-field management layer.