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 integrated circuit (IC) is disclosed. The method includes receiving a semiconductor device, patterning a first hard mask to form a first recess in a high-resistor (Hi-R) stack, removing the first hard mask, forming a second recess in the Hi-R stack, forming a second hard mask in the second recess in the Hi-R stack. A HR can then be formed in the semiconductor substrate by the second hard mask and a gate trench etch.
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 device includes a semiconductor substrate, and a plurality of semiconductor fins parallel to each other, wherein the plurality of semiconductor fins is a portion of the semiconductor substrate. A Shallow Trench Isolation (STI) region is on a side of the plurality of semiconductor fins. The STI region has a top surface and a non-flat bottom surface, wherein the plurality of semiconductor fins is over the top surface of the STI region.
摘要:
A single wafer etching apparatus and various methods implemented in the single wafer etching apparatus are disclosed. In an example, etching a silicon nitride layer in a single wafer etching apparatus includes: heating a phosphoric acid to a first temperature; heating a sulfuric acid to a second temperature; mixing the heated phosphoric acid and the heated sulfuric acid; heating the phosphoric acid/sulfuric acid mixture to a third temperature; and etching the silicon nitride layer with the heated phosphoric acid/sulfuric acid mixture.
摘要:
An exemplary structure for a gate structure of a field effect transistor comprises a gate electrode; a gate insulator under the gate electrode having footing regions on opposing sides of the gate electrode; and a sealing layer on sidewalls of the gate structure, wherein a thickness of lower portion of the sealing layer overlying the footing regions is less than a thickness of upper portion of the sealing layer on sidewalls of the gate electrode, whereby the field effect transistor made has almost no recess in the substrate surface.
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 of forming a dual damascene opening comprising the following steps. A structure having an overlying exposed conductive layer formed thereover is provided. A dielectric layer is formed over the exposed conductive layer. An anti-reflective coating layer is formed over the dielectric layer. The anti-reflective layer and the dielectric layer are etched using a via opening process to form an initial via exposing a portion of the conductive layer. A protective film portion is formed over at least the exposed portion of the conductive layer. The anti-reflective coating layer and the dielectric layer are patterned to reduce the initial via to a reduced via and to form a trench opening substantially centered over the reduced via. The trench opening and the reduced via comprising the dual damascene opening.
摘要:
A shallow trench isolation (STI) structure has a top portion tapering in width from wide to narrow in a direction from a substrate surface, from a first width at a top of the first portion to a second width at a bottom of the first portion. The STI structure also includes a bottom portion below the top portion, which expands from the bottom of the top portion to a substantially widened lateral distance having a third width. The third width is, in general, substantially larger than the second width. The inventive STI structure can provide desired isolation characteristics with a significantly reduced aspect ratio, thus suitable for device isolations in advanced processing technology.
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.