概要（Overview）

The Rainbow 4520XL is part of Lam Research’s Rainbow series of etch systems, introduced in 1987. This series addresses processes for wafers up to 200mm and feature sizes as small as 0.35 micron. The Rainbow product line includes the 4400, 4500, 4600, and 4700 series for etching polysilicon, oxide, aluminum, and tungsten films. These systems offer improved etch capability, reliability, and performance through unique features such as a patented wafer handling system and a proprietary source for generating stable plasma.