Diode Plate-Shaped Semiconductor Element Contacting
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Solution Overview
Problem
Existing diodes with plate-shaped semiconductor elements face issues with incorrect contacting due to crystal defects introduced during manufacturing, leading to flawed connections and potential short-circuits caused by thermal expansion differences, which affect the quality and reliability of the diodes.
Innovation Solution
The diode design includes a first connecting layer that ensures exclusive current flow through the diode element without contacting the further diode in the edge region with crystal defects, allowing for simple electrical measurement to detect correct contacting and prevent thermal creep by using a lateral distance greater than the space charge zone and metal ring structures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the first connecting layer is arranged to contact both the diode element and the further diode element in the edge region, then the manufacturing process becomes simpler, but the reliability deteriorates due to potential short-circuits and flawed connections
Solution Approach 1:
The patent divides the semiconductor element into two distinct regions: a central diode element region and an edge region containing further diode elements. The first connecting layer is precisely positioned to contact only the central diode element, while the edge region remains electrically isolated. This segmentation allows the manufacturing process to remain simple while ensuring reliable electrical connections by preventing short-circuits between the main diode and edge regions.
Solution Approach 2:
The patent applies different electrical properties to different regions of the semiconductor element. The central region is designed for primary electrical contact through the first connecting layer, while the edge region is intentionally left uncontacted to prevent flawed connections. This local differentiation ensures that the main diode element receives proper electrical connection while the edge region with crystal defects does not compromise the overall reliability.
2Manufacturing precision
If the first connecting layer is incorrectly arranged during manufacturing, then the manufacturing precision decreases, but the ability to detect the error through electrical measurement improves
Solution Approach 1:
The patent incorporates an inherent feedback mechanism where the electrical behavior of the diode provides information about the correctness of the connecting layer arrangement. By designing the edge region to be uncontacted under correct manufacturing conditions, any deviation from the intended design creates a detectable electrical signature. This allows automatic detection of manufacturing errors through simple electrical measurements, enabling real-time quality control without requiring complex inspection equipment.
3Device complexity
If the lateral distance between the diode and the further diode is reduced, then the device complexity decreases, but the reliability worsens due to space charge zone extension and thermal creep
Solution Approach 1:
The patent preemptively establishes an adequate lateral distance between the central diode element and the edge region during the manufacturing stage, before operational issues can arise. This pre-planned spacing accounts for the extension of the space charge zone during operation and prevents thermal creep from causing short-circuits. By building in this safety margin during manufacturing, the device maintains simple spatial arrangement while ensuring long-term reliability under operational conditions.
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 design improves diode quality by ensuring correct contacting and preventing short-circuits, allowing for reliable monitoring of the manufacturing process and thermal stability, thereby enhancing the diodes' performance and longevity.
Implementation Method 1
the diode element is contacted by the first connecting layer, and a further diode element, which is situated in an edge region which has crystal defects, is not contacted. In the case of correct contacting, current therefore exclusively flows via the diode element
Implementation Method 2
the diode and the further diode are to have a lateral distance from one another which is greater than the width of the space charge zone, which propagates from the diode in the blocking case
Implementation Method 3
during operation of the diode as a result of mechanical stress as a result of the different coefficients of thermal expansion of the participating materials
Data Source
AI summary
A diode is provided having a plate-shaped semiconductor element that includes a first side and a second side, the first side being connected by a first connecting layer to a first metallic contact and the second side being connected by a second connecting layer to a second metallic contact, the first side having a diode element in a middle area and having a further diode element in an edge area of the first side, which has crystal defects as a result of a separating process of the plate-shaped semiconductor element, the first connecting layer only establishing an electrical contact to the diode element and not to the further diode element and, on the first side, the further diode element having an exposed contact, which may be electrically contacted by the first connecting layer.