Power Semiconductor Termination Structure for High-Voltage Blocking
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Solution Overview
Problem
Power semiconductor devices face challenges in ensuring reliable blocking capabilities and efficient electric field management, particularly in high-voltage and high-current applications, due to limitations in existing termination structures.
Innovation Solution
A power semiconductor device with a termination structure comprising doped semiconductor regions and a conductor structure mounted on an insulator block, featuring varying dopant concentrations and an ohmic path for electrical coupling, which helps in managing the electric field and enhancing blocking capabilities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional termination structure is used, then the device complexity is reduced, but the blocking voltage capability and leakage current performance deteriorate
Solution Approach 1:
The termination structure employs different doped semiconductor regions with specific doping concentrations and types (first and second conductivity types) positioned at different locations within the termination region. This local differentiation of electrical properties optimizes the electric field distribution specifically in the termination area, improving blocking voltage capability without requiring complex changes to the entire device structure.
Solution Approach 2:
The termination structure contains nested doped regions where a first doped semiconductor region is positioned within or adjacent to a second doped semiconductor region. This nested arrangement of differently doped regions creates a hierarchical structure that effectively manages the electric field while maintaining a relatively compact termination region design.
2Reliability
If the termination structure is simplified, then the manufacturing process becomes easier, but the leakage current increases
Solution Approach 1:
By implementing specific doped regions with controlled doping concentrations and types at precise locations within the termination structure, the patent achieves effective leakage current control through localized electrical property optimization, which can be integrated into existing semiconductor manufacturing processes.
Solution Approach 2:
The termination structure utilizes vertical layering of doped regions with different conductivity types and concentrations, adding a dimensional aspect to the termination region design. This vertical structuring enables effective leakage control without requiring extensive lateral expansion or complex lateral patterning steps.
3Reliability
If a complex termination structure is implemented, then the blocking capability is improved, but the manufacturing precision requirements increase
Solution Approach 1:
The patent achieves improved blocking capability through localized doped regions with specific electrical properties positioned where they are most effective for electric field management. This targeted approach allows for relaxed precision requirements in non-critical areas while focusing manufacturing precision only where needed for optimal performance.
Solution Approach 2:
The termination structure utilizes variations in doping concentration and conductivity type as key parameters to achieve the desired blocking capability. By optimizing these material parameters rather than relying solely on geometric precision, the design achieves high performance with more achievable manufacturing tolerances.
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 described termination structure effectively improves the blocking voltage capability and reduces leakage currents, ensuring reliable operation in high-voltage and high-current applications.
Implementation Method 1
the at least one doped semiconductor region comprises (i) a first well with dopants of a second conductivity type, the first well being electrically connected to the first load terminal and laterally overlapping therewith and (ii) a second well having dopants of a second conductivity type, wherein a dopant concentration in the second well varies in a lateral direction
Implementation Method 2
an ohmic path that electrically couples the conductor structure with an electrical potential of the first load terminal, the ohmic path being arranged above the surface
Data Source
AI summary
A power semiconductor device is disclosed. In one example, the device comprises: a semiconductor body comprising a drift region, the drift region having dopants of a first conductivity type; an active region having at least one power cell; least partially into the semiconductor body; the at least one power cell being configured to conduct a load current between said terminals and to block a blocking voltage applied between said terminals; an edge that laterally terminates the semiconductor body; and a non-active termination structure arranged in between the edge and the active region. The termination structure comprises: at least one doped semiconductor region implemented in the semiconductor body; a conductor structure, and an ohmic path that electrically couples the conductor structure with an electrical potential of the first load terminal.