Coupled Guard Ring Edge Termination for High-Voltage Breakdown
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Solution Overview
Problem
Existing power electronics systems face challenges in achieving robust high-voltage operation and immunity to transient overvoltage conditions, particularly in semiconductor devices.
Innovation Solution
The use of edge termination structures formed through implantation processes in III-nitride semiconductor materials, specifically by creating guard rings and junctions with varying resistivity and coupling paths to enhance voltage handling and transient immunity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional edge termination structures are used in power semiconductor devices, then the device can operate at standard voltage levels, but the breakdown voltage is limited and the device is susceptible to transient overvoltage conditions
Solution Approach 1:
The edge termination structure is segmented into multiple concentric guard rings with alternating doping types (n-type and p-type) arranged in a circular pattern around the active device region. This segmentation creates multiple discrete junctions that collectively enhance breakdown voltage through distributed field control, rather than relying on a single termination structure.
Solution Approach 2:
Different regions of the edge termination structure are assigned different doping types and resistivities. Specifically, n-type guard rings alternate with p-type guard rings, creating local variations in electrical properties. This local quality differentiation allows each region to contribute differently to the overall field distribution, maximizing breakdown voltage while maintaining a compact structure.
2Manufacturing precision
If the edge termination structure is simplified, then manufacturing becomes easier, but the breakdown voltage increases by a factor of two or three is not achieved
Solution Approach 1:
The guard rings are formed through a preliminary ion implantation process that establishes the alternating n-type and p-type doping pattern before final device operation. This preliminary action creates the desired resistivity variations and junction structures in advance, enabling the breakdown voltage enhancement to be achieved during normal device operation without requiring complex real-time control mechanisms.
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
This approach significantly increases the breakdown voltage of semiconductor devices by a factor of two or three, while also providing immunity to transient overvoltage conditions, thereby improving the overall performance and reliability of power electronics systems.
Implementation Method 1
performing implantation of a neutralizing species into a plurality of junctions within the field region
Implementation Method 2
a plurality of coupling paths. At least one of the plurality of coupling paths is arranged to connect two adjacent guard rings of the plurality of guard rings
Data Source
AI summary
A semiconductor device includes an active device region and a plurality of guard rings arranged in a first concentric pattern surrounding the active device region. The semiconductor device also includes a plurality of junctions arranged in a second concentric pattern surrounding the active device region. At least one of the plurality of junctions is arranged between two adjacent guard rings of the plurality of guard rings, and the plurality of junctions have a different resistivity than the plurality of guard rings. The semiconductor device further includes a plurality of coupling paths. At least one of the plurality of coupling paths is arranged to connect two adjacent guard rings of the plurality of guard rings.