Semiconductor Die Edge Sealing Structures for Crack Prevention
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Solution Overview
Problem
Mechanical stresses during wafer dicing can cause cracks and defects in semiconductor dies, impairing the functionality of the circuitry fabricated on them.
Innovation Solution
A deep trench isolation region is formed around the perimeter of the semiconductor die to act as a sealing structure, with a conductive material extending through the substrate layers to contact the handle layer, and a vertical crackstop structure is formed to provide electrical connections and protect against defect propagation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If wafer dicing is performed to separate multiple instances of electrical circuit on a semiconductor substrate, then manufacturing efficiency is improved, but mechanical stresses during dicing cause cracks or physical defects in the individual dies
Solution Approach 1:
A deep trench isolation region is formed around the perimeter of the semiconductor die before dicing to create a sealing structure. This preliminary structural preparation prevents cutting defects from propagating into the device region during the subsequent dicing process, allowing high-speed wafer separation while maintaining die integrity.
Solution Approach 2:
The deep trench isolation region acts as an intermediary barrier between the scribe region (where cutting occurs) and the device region (where circuits are fabricated). This isolation structure absorbs and blocks mechanical stresses and cracks, preventing them from reaching the functional circuitry while allowing the dicing process to proceed efficiently.
2Reliability
If a deep trench isolation region is formed around the perimeter of the semiconductor die to prevent defect propagation, then reliability is improved, but device complexity increases
Solution Approach 1:
The semiconductor substrate is segmented into distinct regions: a device region for circuit fabrication and a scribe region for dicing, separated by a deep trench isolation region. This segmentation isolates the functional area from mechanical stresses during cutting, providing protection without significantly complicating the overall device structure.
Solution Approach 2:
The deep trench isolation region is strategically placed only at the perimeter of the die in the scribe region, where it is most needed to block defect propagation. The interior device region maintains its original simple structure, so the complexity increase is localized and minimal while reliability is significantly improved.
Data Source
AI summary
Die structures for electronic devices and related fabrication methods are provided. An exemplary die structure includes a diced portion of a semiconductor substrate that includes a device region having one or more semiconductor devices fabricated thereon and an edge sealing structure within the semiconductor substrate that circumscribes the device region. In one or more embodiments, the edge sealing structure includes a conductive material that contacts a handle layer of semiconductor material, a crackstop structure is formed overlying the sealing structure, wherein the crackstop structure and the edge sealing structure provide an electrical connection between the handle layer and an active layer of semiconductor material that overlies a buried layer of dielectric material on the handle layer.