Strip-Ground Field Plate for Semiconductor Gate Edge Control
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Solution Overview
Problem
Semiconductor devices face performance degradation due to gate edge electric fields, leading to reduced breakdown voltage and increased gate charge, which affects their switching efficiency.
Innovation Solution
A strip-ground field plate is integrated within the semiconductor device, connected to the source region or ground plane, to provide a release path for the gate edge electric field, thereby enhancing breakdown voltage and reducing gate charge.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional gate structure is used, then the device can be manufactured with standard processes, but the gate edge electric field causes reduced breakdown voltage and increased gate charge
Solution Approach 1:
The gate structure is segmented by introducing a strip-ground field plate that divides the gate edge region into distinct zones. This segmentation allows the electric field to be managed in separate regions, with the field plate creating a controlled transition zone that reduces the peak electric field intensity at the gate edge, thereby improving breakdown voltage without requiring complete redesign of the entire gate structure.
Solution Approach 2:
The strip-ground field plate acts as an intermediary element between the gate electrode and the drain region. This intermediate structure provides a gradual transition for the electric field lines, preventing direct concentration at the gate edge. The field plate material and its positioning serve as a mediator that controls electric field distribution, improving reliability while maintaining compatibility with standard manufacturing processes.
2Productivity
If the gate edge electric field is not managed, then the device structure remains simple, but the gate charge increases and switching efficiency decreases
Solution Approach 1:
The strip-ground field plate is positioned and configured in advance during the manufacturing process to preemptively manage the electric field distribution. By establishing the field plate structure before final device operation, the electric field is pre-conditioned to follow desired paths, reducing gate charge accumulation and improving switching efficiency from the outset rather than requiring corrective measures during operation.
3Reliability
If the breakdown voltage is increased through field plate integration, then the device can handle higher voltages, but the manufacturing process becomes more complex
Solution Approach 1:
The strip-ground field plate is merged with existing gate structure components and manufacturing steps. Rather than adding a completely separate fabrication process, the field plate is integrated into the gate electrode formation sequence, utilizing similar deposition and patterning techniques. This merging approach allows breakdown voltage enhancement while minimizing increases in manufacturing complexity.
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 integration of the strip-ground field plate increases the breakdown voltage from approximately 80V to 130V and decreases the gate charge from 220 nC/cm2 to 130 nC/cm2, improving the semiconductor device's performance.
Implementation Method 1
a gate charge, such as a gated edge electric field, can result which can lead to decreased performance of the semiconductor device
Data Source
AI summary
Among other things, one or more semiconductor devices and techniques for forming such semiconductor devices are provided. The semiconductor device comprises a strip-ground field plate. The strip-ground field plate is connected to a source region of the semiconductor device and/or a ground plane. The strip-ground field plate provides a release path for a gate edge electric field. The release path directs an electrical field away from a gate region of the semiconductor device. In this way, breakdown voltage and gate charge are improved.