摘要:
An isolation trench having localized stressors is provided. In accordance with embodiments of the present invention, a trench is formed in a substrate and partially filled with a dielectric material. In an embodiment, the trench is filled with a dielectric layer and a planarization step is performed to planarize the surface with the surface of the substrate. The dielectric material is then recessed below the surface of the substrate. In the recessed portion of the trench, the dielectric material may remain along the sidewalls or the dielectric material may be removed along the sidewalls. A stress film, either tensile or compressive, may then be formed over the dielectric material within the recessed portion. The stress film may also extend over a transistor or other semiconductor structure.
摘要:
An isolation trench having localized stressors is provided. In accordance with embodiments of the present invention, a trench is formed in a substrate and partially filled with a dielectric material. In an embodiment, the trench is filled with a dielectric layer and a planarization step is performed to planarize the surface with the surface of the substrate. The dielectric material is then recessed below the surface of the substrate. In the recessed portion of the trench, the dielectric material may remain along the sidewalls or the dielectric material may be removed along the sidewalls. A stress film, either tensile or compressive, may then be formed over the dielectric material within the recessed portion. The stress film may also extend over a transistor or other semiconductor structure.
摘要:
A method of fabricating a semiconductor IC is disclosed. The method includes receiving a device. The device includes a semiconductor substrate, a plurality of fins and trenches between fins in the semiconductor substrate. The method also includes filling the trenches with a dielectric material to form shallow trench isolations (STI), applying a low-thermal-budget annealing to the dielectric material, and applying a wet-treatment to the dielectric material.
摘要:
A method of fabricating a semiconductor IC is disclosed. The method includes receiving a device. The device includes a semiconductor substrate, a plurality of fins and trenches between fins in the semiconductor substrate. The method also includes filling the trenches with a dielectric material to form shallow trench isolations (STI), applying a low-thermal-budget annealing to the dielectric material, and applying a wet-treatment to the dielectric material.
摘要:
The present disclosure provides a method for fabricating a semiconductor device that includes providing a silicon substrate, forming a gate stack over the silicon substrate, performing a biased dry etching process to the substrate to remove a portion of the silicon substrate, thereby forming a recess region in the silicon substrate, performing a non-biased etching process to the recess region in the silicon substrate, thereby forming a bottle-neck shaped recess region in the silicon substrate, and epi-growing a semiconductor material in the bottle-neck shaped recess region in the silicon substrate. An embodiment may include a biased dry etching process including adding HeO2 gas and HBr gas. An embodiment may include performing a first biased dry etching process including N2 gas and performing a second biased dry etching process not including N2 gas. An embodiment may include performing an oxidation process to the recess region in the silicon substrate by adding oxygen gas to form silicon oxide on a portion of the recess region in the silicon substrate. As such, these processes form polymer protection to help form the bottle-neck shaped recess.
摘要:
A method for forming a hard mask for gate electrode patterning in a semiconductor device is disclosed. The method includes providing a polysilicon layer to be etched and forming over the polysilicon layer, a nitride hardmask with a relatively high etch rate to hydrofluoric acid, as compared to the etch rate of silicon oxide. The polysilicon can then be patterned using the hardmask and the hardmask can be removed using hydrofluoric acid.
摘要:
The present disclosure provides a method for fabricating a semiconductor device that includes providing a silicon substrate, forming a gate stack over the silicon substrate, performing a biased dry etching process to the substrate to remove a portion of the silicon substrate, thereby forming a recess region in the silicon substrate, performing a non-biased etching process to the recess region in the silicon substrate, thereby forming a bottle-neck shaped recess region in the silicon substrate, and epi-growing a semiconductor material in the bottle-neck shaped recess region in the silicon substrate. An embodiment may include a biased dry etching process including adding HeO2 gas and HBr gas. An embodiment may include performing a first biased dry etching process including N2 gas and performing a second biased dry etching process not including N2 gas. An embodiment may include performing an oxidation process to the recess region in the silicon substrate by adding oxygen gas to form silicon oxide on a portion of the recess region in the silicon substrate. As such, these processes form polymer protection to help form the bottle-neck shaped recess.
摘要:
A method for forming a hard mask for gate electrode patterning in a semiconductor device is disclosed. The method includes providing a polysilicon layer to be etched and forming over the polysilicon layer, a nitride hardmask with a relatively high etch rate to hydrofluoric acid, as compared to the etch rate of silicon oxide. The polysilicon can then be patterned using the hardmask and the hardmask can be removed using hydrofluoric acid.
摘要:
The disclosure relates to a fin field effect transistor (FinFET). An exemplary structure for a FinFET comprises a substrate comprising a major surface; a plurality of first trenches having a first width and extending downward from the substrate major surface to a first height, wherein a first space between adjacent first trenches defines a first fin; and a plurality of second trenches having a second width less than first width and extending downward from the substrate major surface to a second height greater than the first height, wherein a second space between adjacent second trenches defines a second fin.
摘要:
Provided is a method of semiconductor fabrication including process steps allowing for defining and/or modifying a gate structure height during the fabrication process. The gate structure height may be modified (e.g., decreased) at one or more stages during the fabrication by etching a portion of a polysilicon layer included in the gate structure. The method includes forming a coating layer on the substrate and overlying the gate structure. The coating layer is etched back to expose a portion of the gate structure. The gate structure (e.g., polysilicon) is etched back to decrease the height of the gate structure.