Abstract:
By forming bulk-like transistors (151B) in sensitive RAM areas of otherwise SOI-based CMOS circuits, a significant savings in valuable chip area may be achieved since the RAM areas may be formed on the basis of a bulk transistor configuration, thereby eliminating hysteresis effects that may typically be taken into consideration by providing transistors of increased transistor width or by providing body ties. Hence, the benefit of high switching speed may be maintained in speed-critical circuitry, such as CPU cores, while at the same time the RAM circuit may be formed in a highly space-efficient manner.
Abstract:
SRAM devices utilizing tensile-stressed strain films and methods for fabricating such SRAM devices are provided. An SRAM device (50), in one embodiment, comprises an NFET (54) and a PFET (52) that are electrically coupled and physically isolated. The PFET (52) has a gate region (64), a source region (60), and a drain region (58). A tensile-strained stress film (76) is disposed on the gate region (64) and at least a portion of the source region (60) and the drain region (58) of the PFET (52). A method for fabricating a cell of an SRAM device (50) comprises fabricating an NFET (54) and a PFET (52) overlying a substrate (56). The PFET (52) and the NFET (54) are electrically coupled and are physically isolated. A tensile-strained stress film (76) is deposited on the gate region (64) and at least a portion of the source region (60) and the drain region (58) of the PFET (52).
Abstract:
The introduction of a barrier diffusion material, such as nitrogen, into a silicon-containing conductive region, for example the drain and source regions (204, 205) and the gate electrode (208) of a field effect transistor, allows the formation of nickel silicide (211, 212), which is substantially thermally stable up to temperatures of 500 °C. Thus, the device performance may significantly improve as the sheet resistance of nickel silicide is significantly less than that of nickel disilicide.
Abstract:
In a dual stress liner approach, an intermediate etch stop material (234) may be provided on the basis of a plasma-assisted oxidation process (250) rather than by deposition so the corresponding thickness (234T) of the etch stop material (234) may be reduced. Consequently, the resulting aspect ratio may be less pronounced compared to conventional strategies, thereby reducing deposition-related irregularities which may translate into a significant reduction of yield loss, in particular for highly scaled semiconductor devices (200).
Abstract:
By locally adapting the blocking capability of gate insulation layers 205A, 205B for N-channel transistors and P-channel transistors, the reliability and threshold stability of the P-channel transistor may be enhanced, while nevertheless electron mobility of the N-channel transistor may be kept at a high level. This may be accomplished by incorporating a different amount of a dielectric dopant into respective gate insulation layer portions 205A, 205B.
Abstract:
A layer stack (220) comprising at least three material layers (221, 222, and 223) is provided on a silicon-containing conductive region to form a silicide portion (208) on and in the silicon-containing conductive region, wherein the layer (221) next to the silicon provides the metal atoms for the silicide reaction, the intermediate layer (222) is a metal-nitrogen-compound formed by supplying a nitrogen containing as during deposition, and for formation of the top layer (223), supply for said gas is discontinued. The method may be carried out as an in situ method, thereby significantly improving throughput and deposition tool performance compared to typical prior art processes, in which at least two deposition chambers have to be used
Abstract:
A method of forming oxide layers of different thickness on a substrate (1) is disclosed, wherein the oxide layers preferably serve as gate insulation layers of field effect transistors. The method allows to form very thin, high quality oxide layers with a reduced number of masking steps compared to the conventional processing, wherein the thickness difference can be maintained within a range of some tenths of a nanometer. The method substantially eliminates any high temperature oxidations and is also compatible with most chemical vapor deposition techniques used for gate dielectric deposition in sophisticated semiconductor devices
Abstract:
By forming a buried nickel silicide layer (260A) followed by a cobalt silicide layer (261A) in silicon containing regions, such as a gate electrode of a field effect transistor, the superior characteristics of both silicides may be combined so as to provide the potential for further device scaling without unduly compromising the sheet resistance and the contact resistance of scaled silicon circuit features.
Abstract:
The present invention provides a technique for forming extremely thin insulation layers requiring the incorporation of specified amounts of nitrogen, wherein the effect of nitrogen variations across the substrate surface may be reduced in that during and/or after the nitrogen incorporation an oxidation process is performed. The nitrogen variations lead to a nitrogen concentration dependent oxidation rate and, hence, a nitrogen concentration dependent thickness variation of the insulating layer. In particular, the threshold variations of transistors including the thin insulating layer as a gate insulation layer may effectively be reduced.
Abstract:
A semiconductor device comprises a field effect transistor (250) and a passive capacitor (240), wherein the dielectric layer (221a) of the capacitor (240) is comprised of a high-k material, whereas the gate insulation layer (231) of the field effect transistor (250) is formed of an ultra thin oxide layer or oxynitride layer so as to provide for superior carrier mobility at the interface between the gate insulation layer and the underlying channel region. Since carrier mobility in the capacitor is not of great importance, the high-k material allows the provision of high capacitance per unit area while featuring a thickness sufficient to effectively reduce leakage current.