IGBT Interconnects Using Ceramic Vias for Reliable Power Switching
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Solution Overview
Problem
Conventional interconnects in insulated gate bipolar transistors (IGBTs) face issues with reliability and stability, which can affect the performance of high-power alternating current motor applications.
Innovation Solution
The solution involves a semiconductor subassembly with a wafer having metallized faces, a semiconductor switching device, and an interconnect comprising a first metal layer bonded to the device, a ceramic layer defining a via, and a conducting substance within the via to electrically couple the metal layers, forming a contact pad for the electrode regions, ensuring stable and reliable connections.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional interconnects are used in IGBTs, then the structure is simple and manufacturing is easier, but the reliability and stability deteriorate
Solution Approach 1:
The interconnect is divided into multiple functional layers: a first metal layer bonded to the electrode region, a ceramic layer with embedded vias, a second metal layer forming contact pads, and conducting substances filling the vias. This segmentation allows each layer to perform its specific function optimally, improving overall reliability while managing complexity through modular design
Solution Approach 2:
The interconnect employs composite material construction combining metal layers (for electrical conductivity), ceramic layer (for mechanical stability and insulation), and conducting substances (for electrical coupling). This multi-material approach enhances both reliability and stability by leveraging the strengths of each material type
2Reliability
If conventional interconnects are used in IGBTs, then the manufacturing process is simpler, but the stability deteriorates
Solution Approach 1:
The ceramic layer is prepared in advance with vias formed and conducting substances embedded before final assembly. This preliminary action ensures that the ceramic layer provides stable mechanical support and electrical isolation from the outset, improving interconnect stability while allowing subsequent assembly steps to focus on bonding operations
Solution Approach 2:
The conducting substances are nested within the vias of the ceramic layer, which itself is nested between the first and second metal layers. This nested configuration ensures proper alignment and secure positioning of each component, enhancing stability through precise geometric constraints that are maintained during 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
This configuration enhances the reliability and stability of interconnects in IGBTs, improving the performance and durability of semiconductor subassemblies in high-power alternating current motor applications by reducing stress and ensuring secure electrical connections.
Implementation Method 1
a first metal layer bonded to the at least one electrode region of the semiconductor switching device
Implementation Method 2
a conducting substance disposed in the via of the ceramic layer to electrically couple the first metal layer to the second metal layer
Data Source
AI summary
A semiconductor subassembly is provided for use in a switching module of an inverter circuit for a high power, alternating current motor application. The semiconductor subassembly includes a wafer having first and second opposed metallized faces; a semiconductor switching device electrically coupled to the first metallized face of the wafer and having at least one electrode region; and an interconnect bonded to the semiconductor switching device. The interconnect includes a first metal layer bonded to the at least one electrode region of the semiconductor switching device, a ceramic layer bonded to the first metal layer, the ceramic layer defining a via for accessing the first metal layer, a second metal layer bonded to the ceramic layer, and a conducting substance disposed in the via of the ceramic layer to electrically couple the first metal layer to the second metal layer.