Method of fabricating gate

摘要

A method for fabricating a gate. A gate oxide layer is formed on a substrate. A first doped polysilicon layer is formed on the gate oxide layer. A second doped polysilicon layer on the first doped polysilicon layer. A third doped polysilicon layer over the second polysilicon layer. The second doped polysilicon layer has a grain size larger than a grain size of both the first doped polysilicon layer and the third dope polysilicon layer.