| 摘要 |
A method is provided that includes providing a substrate, forming a first gate structure in a first region and a second gate structure in a second region, the first and second gate structures each including a high-k dielectric layer, a silicon layer, and a hard mask layer, where the silicon layer of the first gate structure has a different thickness than the silicon layer of the second gate structure, forming an interlayer dielectric (ILD) over the first and second gate structures, performing a chemical mechanical polishing (CMP) on the ILD, removing the silicon layer from the first gate structure thereby forming a first trench, forming a first metal layer to fill in the first trench, removing the hard mask layer and the silicon layer from the second gate structure thereby forming a second trench, and forming a second metal layer to fill in the second trench.
|
