The Evolution of Semiconductor Singulation
Following the completion of front-end photolithography and wafer sorting, integrated circuits must be accurately singulated (separated) from the continuous silicon wafer disc into discrete dies. Selecting the optimal dicing strategy directly dictates structural yield numbers, micro-cracking margins, and backside chipping limits.
| Process Metric | Mechanical Diamond Blade Sawing | Laser Stealth Dicing Technology |
|---|---|---|
| Kerf Width (Street Loss) | Wide (30 – 50 microns) | Near-Zero (Internal Kerfless Process) |
| Chipping and Micro-Cracking | Common along mechanical cutting edges | Eliminated; internal thermal stress separation |
| Processing Throughput Speed | Slow; mechanical feeding limits | Extremely high-speed laser scanning passes |
[Image of Laser Stealth Dicing Internal Silicon Wafer Modifications Diagram]
The Sub-Surface Laser Modification Principle
Unlike traditional laser cutting which ablates surface material from above, Stealth Dicing focuses an infrared laser wavelength deep into the internal crystalline structure of the silicon wafer. This forms a localized, perforated modification layer without damaging the active top circuits. Subsequent mechanical tape expansion cleanly snaps the individual chips apart along the internal laser-induced lines.
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