Abstract:
A stressed field effect transistor (40) and methods for its fabrication are provided. The field effect transistor (40) comprises a silicon substrate (44) with a gate insulator (54) overlying the silicon substrate. A gate electrode (62) overlies the gate insulator and defines a channel region (68) in the silicon substrate underlying the gate electrode. A first silicon germanium region (76) having a first thickness is embedded in the silicon substrate and contacts the channel region. A second silicon germanium region (82) having a second thickness greater than the first thickness and spaced apart from the channel region is also embedded in the silicon substrate.
Abstract:
A method of forming a semiconductor device provides a gate electrode (32) on a substrate (30); and an oxide liner (34) that is less than 100 A in thickness on the substrate (30) and the gate electrode (32). A nitride layer (38) is formed on the oxide liner (34). The nitride layer (38) is etched to form nitride spacers (40), the etching stopping on the oxide liner (34). The thinner oxide liner (34), e.g., less than 100 A, prevents the liner (34) from acting as a sink for dopants during thermal processing so that the dopants in the source/drain extension regions (36) and the source/drain regions (42) remain in the substrate (30) during the thermal processing, thereby preventing degradation of transistor performance.
Abstract:
Semiconductor devices with improved transistor performance are fabricated by forming a composite oxide/nitride liner (24,25) under a gate electrode sidewall spacer (40). Embodiements include depositing a conformal oxide layer (24) by decoupled plasma deposition, depositing a conformal nitride layer (25) by decoupled plasma deposition, depositing a spacer layer (30) and then etching.
Abstract:
A local oxidation of silicon (LOCOS) process directed to forming differential field oxide thickness on a single wafer in one patterning step and one growth step. When patterning the masking layer, at least two window widths are formed in the masking layer, exposing the underlying substrate and pad oxide. When one of the window widths is sufficiently small, oxidation of the substrate will be inhibited causing reduced growth and thus a reduced field oxide thickness in that window as compared to other larger windows formed in the same masking layer, creating differential field oxide thicknesses in one growth step.
Abstract:
The height of epitaxially grown semiconductor regions in extremely scaled semiconductor devices may be adjusted individually for different device regions in that two or more epitaxial growth steps may be carried out, wherein an epitaxial growth mask selectively suppresses the formation of a semiconductor region in a specified device region. In other embodiments, a common epitaxial growth process may be used for two or more different device regions and subsequently a selective oxidation process may be performed on selected device regions so as to precisely reduce the height of the previously epitaxially grown semiconductor regions in the selected areas.
Abstract:
A structure for patterning a polysilicon layer includes a TiN layer located above an amorphous silicon (a-Si) layer forming a TiN/a-Si stack. The TiN/a-Si stack is located above the polysilicon layer. The TiN layer serves as an ARC to reduce overexposure of the photoresist used to pattern the polysilicon layer, while the a-Si layer prevents contamination of the layer below the polysilicon layer.
Abstract translation:用于图案化多晶硅层的结构包括位于形成TiN / a-Si叠层的非晶硅(a-Si)层之上的TiN层。 TiN / a-Si堆叠位于多晶硅层的上方。 TiN层用作ARC以减少用于图案化多晶硅层的光致抗蚀剂的过度曝光,而a-Si层防止多晶硅层下面的层被污染。
Abstract:
Methods for manufacturing an integrated circuit are provided. An exemplary method comprises the step of providing a silicon substrate (24) having a first crystalline orientation. A silicon layer (22) having a second crystalline orientation is bonded to the silicon substrate. The second crystalline orientation is different from the first crystalline orientation. The silicon layer is etched to expose a portion of the silicon substrate and an amorphous silicon layer (50) is deposited on the exposed portion. The amorphous silicon layer is transformed into a regrown crystalline silicon layer (52) having the first crystalline orientation. A first field effect transistor (80) is formed on the silicon layer and a second field effect transistor (82) is foπned on the regrown crystalline silicon layer.
Abstract:
An integrated circuit and methods for its manufacture are provided. The integrated circuit (20) comprises a bulk silicon substrate (24) having a first region (64, 66) of (100) crystalline orientation and a second region (66, 64) of (110) crystalline orientation. A layer (62) of silicon on insulator overlies a portion of the bulk silicon substrate. At least one field effect transistor (96, 98) is formed in the layer (62) of silicon on insulator, at least one P-channel field effect transistor (90, 92) is formed in the second region (66, 64) of (110) crystalline orientation, and at least one N-channel field effect transistor (90, 92) is formed in the first region (64, 66) of (100) crystalline orientation.
Abstract:
An insulated gate semiconductor device (100) having reduced gate resistance and a method for manufacturing the semiconductor device (100). A gate structure (112) is formed on a major surface (104) of a semiconductor substrate (102). Successive nitride spacers (118, 128) are formed adjacent the sidewalls of the gate structure (112). The nitride spacers (118, 128) are etched and recessed using a single etch to expose the upper portions (115A, 117A) of the gate structure (112). Source (132) and drain (134) regions are formed in the semiconductor substrate (102). Silicide regions (140, 142, 144) are formed on the top surface (109) and the exposed upper portions (115A, 117A) of the gate structure (112) and the source region (132) and the drain region (134). Electrodes (150, 152, 154) are formed in contact with the silicide (140, 142, 144) of the respective gate structure (112), source region (132), and the drain region (134).
Abstract:
The present invention is directed toward a method for independently doping the gate and the source-drain regions of a semiconductor device. The method is initiated by the provision of a substrate having isolation regions and a thin insulating layer. Over the substrate is formed a polysilicon layer which is doped with a first type of dopant at a first doping level. Over the polysilicon layer is formed a conducting layer of material that can withstand temperatures of 1000 DEG C, and over the conducting layer is formed a blocking layer. The polysilicon layer, the conducting layer and the blocking layer are etched to form a gate stack. Source-drain regions are subsequently doped with a second type of dopant at a second doping level. Source-drain regions are activated in a 1000 DEG C heat cycle, and, subsequently, TiSi2 is formed on the source-drain regions. Contacts are then formed. The blocking layer on the gate stack need not be removed, which aids in minimizing substrate damage and in prevention of shorting a source-drain contact region to the substrate.