Abstract:
A conductive structure in an integrated circuit (12), and a method of forming the structure, is provided that includes a polysilicon layer (30), a thin layer containing titanium over the polysilicon, a tungsten nitride layer (34) over the titanium-containing layer and a tungsten layer over the tungsten nitride layer. The structure also includes a silicon nitride interfacial region (38) between the polysilicon layer and the titanium-containing layer. The structure withstands high-temperature processing without substantial formation of metal silicides in the polysilicon layer (30) and the tungsten layer (32), and provides low interface resistance between the tungsten layer and the polysilicon layer.
Abstract:
A method of enhancing the rate of transistor gate corner oxidation, without significantly increasing the thermal budget of the overall processing scheme is provided. Specifically, the method of the present invention includes implanting ions into gate corners (20) of a Si-containing transistor having a gate conductor (16) and a dielectric cap (18), and exposing the transistor including implanted transistor gate corners (20) to an oxidizing ambient. The ions employed in the implant step include Si, non-retarding oxidation ions such as O, Ge, As, B, P, In, Sb, Ga, F, C1, He, Ar, Kr, and Xe; and mixtures thereof.
Abstract:
Disclosed is an improved semiconductor structure 150 (e.g., a silicon germanium (SiGe) hetero-junction bipolar transistor 100) having a narrow essentially interstitial-free SIC pedestal 120 with minimal overlap of the extrinsic base 104. Also, disclosed is a method of forming the transistor which uses laser annealing, as opposed to rapid thermal annealing, of the SIC pedestal to produce both a narrow SIC pedestal and an essentially interstitial-free collector. Thus, the resulting SiGe HBT transistor can be produced with narrower base 103 and collector space-charge regions than can be achieved with conventional technology.
Abstract:
Expitaxial substitutional solid solutions of silicon carbon (101 ) can be obtained by an ultra-fast anneal of an amorphous carbon-containing silicon material. The anneal is performed at a temperature above the recrystallization point, but below the melting point of the material and preferably lasts for less than 100 milliseconds in this temperature regime. The anneal is preferably a flash anneal or laser anneal. This approach is able to produce epitaxial silicon and carbon-containing materials (101 ) with a substantial portion of the carbon atoms at substitutional lattice positions. The approach is especially useful in CMOS processes and other electronic device manufacture where the presence of epitaxial Si1-yCy, y
Abstract:
The present invention provides a strained-Si structure, in which the nFET regions of the structure are strained in tension and the pFET regions of the structure are strained in compression. Broadly the strained-Si structure comprises a substrate; a first layered stack atop the substrate, the first layered stack comprising a compressive dielectric layer atop the substrate and a first semiconducting layer atop the compressive dielectric layer, wherein the compressive dielectric layer transfers tensile stresses to the first semiconducting layer, and a second layered stack atop the substrate, the second layered stack comprising an tensile dielectric layer atop the substrate and a second semiconducting layer atop the tensile dielectric layer, wherein the tensile dielectric layer transfers compressive stresses to the second semiconducting layer. The tensile dielectric layer and the compressive dielectric layer preferably comprise nitride, such as Si 3 N 4 .
Abstract translation:本发明提供一种应变Si结构,其中该结构的nFET区域被拉紧并且该结构的pFET区域被压缩而变形。 广义上,应变Si结构包括基底; 所述第一层叠堆叠包括位于所述衬底顶部的压缩介电层和位于所述压缩介电层顶部的第一半导体层,其中所述压缩介电层将拉伸应力传递到所述第一半导体层,以及第二层叠堆叠 所述第二层叠堆叠包括位于所述衬底顶部的拉伸电介质层和位于所述拉伸介电层顶部的第二半导体层,其中所述拉伸介电层将压缩应力传递到所述第二半导体层。 拉伸介电层和压电介电层优选包括氮化物,例如Si 3 N 4 N 4。
Abstract:
A low-GIRL current MOSFET device (90) structure and a method of fabrication thereof which provides a low-GIRL current. The MOSFET device structure contains a central gate conductor (10) whose edges may slightly overlap the source/drain diffusions (88, 88), and left and right side wing gate conductors (70,70) which are separated from the central gate conductor by a thin insulating and diffusion barrier layer (50, 52).
Abstract:
While embedded silicon germanium alloy and silicon carbon alloy provide many useful applications, especially for enhancing the mobility of MOSFETs through stress engineering, formation of alloyed suicide on these surfaces degrades device performance. The present invention provides structures and methods for providing unalloyed suicide on such silicon alloy surfaces placed on semiconductor substrates. This enables the formation of low resistance contacts for both mobility enhanced PFETs with embedded SiGe and mobility enhanced NFETs with embedded Si:C on the same semiconductor substrate. Furthermore, this invention provides methods for thick epitaxial silicon alloy, especially thick epitaxial Si:C alloy, above the level of the gate dielectric to increase the stress on the channel on the transistor devices.
Abstract:
A process for forming dual gate oxides of improved oxide thickness uniformity for use in high performance DRAM systems or logic circuits, comprising:a) growing a sacrificial oxide layer on a substrate;b) implanting a dopant through the sacrificial oxide layer;c) implanting a first dosage of nitrogen ions in the absence of a photoresist to form a nitrided silicon layer; d) subjecting the substrate to a rapid thermal anneal for a sufficient time and at a sufficient temperature to allow nitrogen to diffuse to the silicon/oxide interface;e) masking the substrate with a photoresist to define the locations of the thin oxides of the dual gate oxide;f) implanting a second dosage of nitrogen ions through the photoresist;g) stripping the photoresist and the sacrificial oxide layers; and h) growing by oxidation gate oxide layers characterized by improved oxide thickness uniformity in the nitrogen ion implanted areas in the thin and thick oxides.
Abstract:
Semiconductor device designs having a buried power rail (602) with a sloped epitaxy buried contact (1702) are provided. In one aspect, a semiconductor FET device includes: at least one gate disposed on a substrate (202); source and drains (906) on opposite sides of the at least one gate, wherein at least one of the source and drains (906) has a sloped surface (1402); a buried power rail (602) embedded in the substrate (202); and a buried contact (1702) that connects the buried power rail (602) to the sloped surface (1402) of the at least one source and drain (906). Sidewall spacers (502) separate the buried power rail (602) from the substrate (202). A top of the sloped surface (1402) of the at least one source and drain (906) is above a top surface of the buried contact (1702).Methods of forming a semiconductor FET device are also provided.
Abstract:
The present invention provides a strained-Si structure, in which the nFET regions of the structure are strained in tension and the pFET regions of the structure are strained in compression. Broadly the strained-Si structure comprises a substrate; a first layered stack atop the substrate, the first layered stack comprising a compressive dielectric layer atop the substrate and a first semiconducting layer atop the compressive dielectric layer, wherein the compressive dielectric layer transfers tensile stresses to the first semiconducting layer; and a second layered stack atop the substrate, the second layered stack comprising an tensile dielectric layer atop the substrate and a second semiconducting layer atop the tensile dielectric layer, wherein the tensile dielectric layer transfers compressive stresses to the second semiconducting layer. The tensile dielectric layer and the compressive dielectric layer preferably comprise nitride, such as Si 3 N 4 .