摘要:
An exemplary method of etching sacrificial layer includes steps of: providing a substrate formed with a sacrificial layer and defined with a first region and a second region, the sacrificial layer disposed in both the first and second regions; forming a hard mask covering the first region while exposing the second region; performing a first etching process on the sacrificial layer to thin the sacrificial layer while forming a byproduct film overlying the thinned sacrificial layer; performing a second etching process on the byproduct film to remove a portion of the byproduct layer for exposing a portion of the thinned sacrificial layer, while another portion of the byproduct film disposed on sidewalls of the thinned sacrificial layer being remained; and performing a third etching process on the thinned sacrificial layer, to remove the portion of the thinned sacrificial layer exposed in the second etching process.
摘要:
A method for fabricating a metal gate transistor is disclosed. The method includes the steps of: providing a substrate having a first transistor region and a second transistor region; forming a first metal-oxide semiconductor (MOS) transistor on the first transistor region and a second MOS transistor on the second transistor region, in which the first MOS transistor includes a first dummy gate and the second MOS transistor comprises a second dummy gate; forming a patterned hard mask on the second MOS transistor, in which the hard mask includes at least one metal atom; and using the patterned hard mask to remove the first dummy gate of the first MOS transistor.
摘要:
A method for fabricating a metal gate transistor is disclosed. The method includes the steps of: providing a substrate having a first transistor region and a second transistor region; forming a first metal-oxide semiconductor (MOS) transistor on the first transistor region and a second MOS transistor on the second transistor region, in which the first MOS transistor includes a first dummy gate and the second MOS transistor comprises a second dummy gate; forming a patterned hard mask on the second MOS transistor, in which the hard mask includes at least one metal atom; and using the patterned hard mask to remove the first dummy gate of the first MOS transistor.
摘要:
A method of manufacturing a semiconductor device having metal gate includes providing a substrate having a first transistor and a second transistor formed thereon, the first transistor having a first gate trench formed therein, forming a first work function metal layer in the first gate trench, forming a sacrificial masking layer in the first gate trench, removing a portion of the sacrificial masking layer to expose a portion of the first work function metal layer, removing the exposed first function metal layer to form a U-shaped work function metal layer in the first gate trench, and removing the sacrificial masking layer. The first transistor includes a first conductivity type and the second transistor includes a second conductivity type. The first conductivity type and the second conductivity type are complementary.
摘要:
A method of manufacturing a semiconductor device having metal gate includes providing a substrate having a first transistor and a second transistor formed thereon, the first transistor having a first gate trench formed therein, forming a first work function metal layer in the first gate trench, forming a sacrificial masking layer in the first gate trench, removing a portion of the sacrificial masking layer to expose a portion of the first work function metal layer, removing the exposed first function metal layer to form a U-shaped work function metal layer in the first gate trench, and removing the sacrificial masking layer. The first transistor includes a first conductivity type and the second transistor includes a second conductivity type. The first conductivity type and the second conductivity type are complementary.
摘要:
A method of fabricating a CMOS device having high-k dielectric layer and metal gate electrode is provided. First, an isolation structure is formed in a substrate to define a first-type and a second-type MOS regions; an interfacial layer and a high-k dielectric layer are sequentially formed over the substrate; a first and a second cover layers are respectively formed over a portion of the high-k dielectric layer at the first-type MOS region and another portion of the high-k dielectric layer at the second-type MOS region; afterwards, an in-situ etching step is performed to sequentially etch the first and second cover layers using a first etching solution and to etch both the high-k dielectric layer and the interfacial layer using a second etching solution until the substrate is exposed. Wherein, the second etching solution is a mixed etching solution containing the first etching solution.
摘要:
A method for removing a photoresist is disclosed. First, a substrate including a patterned photoresist is provided. Second, an ion implantation is carried out on the substrate. Then, a non-oxidative pre-treatment is carried out on the substrate. The non-oxidative pre-treatment provides hydrogen, a carrier gas and plasma. Later, a photoresist-stripping step is carried out so that the photoresist can be completely removed.
摘要:
A method of fabricating a MOS device comprises steps as follows: An interfacial layer, a high-k dielectric layer and a cover layer on a substrate are sequentially formed. Then an in-situ wet etching step is performed by sequentially using a first etching solution to etch the cover layer and using a second etching solution to etch the high-k dielectric layer and the interfacial layer until the substrate is exposed, wherein the second etching solution is a mixed etching solution containing the first etching solution.
摘要:
A method for removing a photoresist is disclosed. First, a substrate including a patterned photoresist is provided. Second, an ion implantation is carried out on the substrate. Then, a non-oxidative pre-treatment is carried out on the substrate. The non-oxidative pre-treatment provides hydrogen, a carrier gas and plasma. Later, a photoresist-stripping step is carried out so that the photoresist can be completely removed.
摘要:
The method of forming a polysilicon layer is provided. A first polysilicon layer with a first grain size is formed on a substrate. A second polysilicon layer with a second grain size is formed on the first polysilicon layer. The first grain size is smaller than the second grain size. The first polysilicon layer with a smaller grain size can serve as a base for the following deposition, so that the second polysilicon layer formed thereon has a flatter topography, and thus, the surface roughness is reduced and the Rs uniformity within a wafer is improved.