Patent ID: 9024393
Filing Date: 2015-05-05
Classification: H01L

Abstract:
1. A manufacturing method for semiconductor device having metal gate, comprising steps of: providing a substrate having a first semiconductor device and a second semiconductor device formed thereon, the first semiconductor device having a first gate trench and the second semiconductor device having a second gate trench; sequentially forming a high dielectric constant (high-k) gate dielectric layer and a multiple metal layer on the substrate; forming a first work function metal layer in the first gate trench and the multiple metal layer being exposed in the second gate trench; performing a first pull back step to remove a portion of the first work function metal layer from the first gate trench; forming a second work function metal layer in the first gate trench and the second gate trench after performing the first pull back step; and performing a second pull back step to remove a portion of the second work function metal layer from the first gate trench and the second gate trench after forming the second work function metal layer.