Abstract:
PROBLEM TO BE SOLVED: To provide a gate structure for MOSFETs for application of the CMOS technology, etc., which is durable against high temperature processes such as junction activation, etc., and reduces the gate propagation delay. SOLUTION: The gate structure 10 has an insulation layer 14 on a semiconductor substrate 12, and a polysilicon gate electrode 16 on the insulation layer 14. The gate structure 10 comprises a diffused barrier layer 20 having semi- insulative characteristics on the gate electrode 16, and a gate conductor 18 on the barrier layer 20. The conductor 18 is electrically contacted to the gate electrode 16. The constitution and the thickness of the barrier layer 20 are adjusted so as to effectively block the diffusion and the mixing between the gate conductor 18 and the gate electrode 16, but realize a capacitive coupling and/or a leak current not so increasing the gate propagation delayer of the gate surface 10.
Abstract:
The present invention provides a semiconductor structure having at least one CMOS device in which the Miller capacitances, i-e., overlap capacitances, are reduced and the drive current is improved. The inventive structure includes a semiconductor substrate having at least one overlaying gate conductor, each of the at least one overlaying gate conductors has vertical edges; a first gate oxide located beneath the at least one overlaying gate conductor, the first gate oxide not extending beyond the vertical edges of the at least overlaying gate conductor; and a second gate oxide located beneath at least a portion of the at one overlaying gate conductor. In accordance with the present invention, the first gate oxide and the second gate oxide are selected from high k oxide-containing materials and low k oxide-containing materials, and the first gate oxide is higher k than the second gate oxide or vice-versa.
Abstract:
A method of fabricating a semiconductor device structure, includes: providing a substrate (1), providing an electrode (6) on the substrate (1), forming a recess (12) in the electrode (6), the recess having an opening, disposing a small grain semiconductor material (17) within the recess, covering the opening to contain the small grain semiconductor material, within the recess, and then annealing the resultant structure.
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 method for forming an oxide of substantially uniform thickness on at least two crystallographic planes of silicon, in accordance with the present invention, includes providing a substrate (step 100) where surfaces have at least two different crystallographic orientations of the silicon crystal (step 102). Atomic oxygen (O) is formed for oxidizing the surfaces (step 106). An oxide is formed (step 108) on the surfaces by reacting the atomic oxygen with the surfaces to simultaneously form a substantially uniform thickness of the oxide on the surfaces.
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.