Rainbow 4420-Crated

The Lam Rainbow 4420-Crated is a plasma etch system manufactured by Lam Research. The system is built for 8 inch wafer processing. The machine is categorized as plasma etch equipment.^[1]

The Lam Rainbow 4420-Crated generates a plasma inside a low-pressure processing chamber. Process gases are introduced into the chamber and energized by radio frequency power to form reactive ions. The ions both chemically react with and physically bombard the exposed wafer surface, removing material in regions not protected by a mask.

A vacuum system maintains the low-pressure environment required for plasma generation. The wafer is held on an electrode within the chamber during processing. Chamber pressure, gas flow, and applied power are controlled to determine etch rate and profile.

Plasma etch systems operate after lithographic patterning and thin-film deposition in the wafer fabrication sequence. The etch step transfers the pattern from the photoresist or hard mask into the underlying film. Following etch, the wafer typically moves to resist strip, wet clean, and inspection steps. Plasma etching defines features such as contact holes, trenches, and interconnect structures.

Plasma etch equipment is used to pattern a range of thin-film materials on semiconductor wafers. Plasma etching is applied to silicon, silicon oxide, silicon nitride, and metal films. The process is used across integrated circuit, memory, and discrete device manufacturing.