Abstract:
An improved fin device used as the body of a field effect transistor ("FET") and an improved process of making the fin device. The fin device allows for the fabrication of very small dimensioned metal-oxide semiconductor ("MOS") FETs in the size range of micrometers to nanometers, while avoiding the typical short channel effects often associated with MOSFETs of these dimensions. Accordingly, higher density MOSFETs may be fabricated such that more devices may be placed on a single semiconductor wafer. The process of making the fin device results in an improved fully planarized device.
Abstract:
PROBLEM TO BE SOLVED: To provide a stable p-type CNTFET and a stable n-type CNTFET by disclosing a CNT technology that overcomes the intrinsic ambipolar properties of CNTFETs. SOLUTION: In order to overcome the ambipolar properties of a CNTFET, source/drain gates 125 are introduced below a CNT 110 opposite source/drain electrodes 105. In this case, the source/drain gates 125 are used to apply either a positive or negative voltage to the ends of a CNT 111 so as to configure the corresponding FET as either an n-type or p-type CNTFET, respectively. In addition, a complementary CNT can be incorporated into a device by two adjacent CNTFETs configured such that one is an n-type CNTFET and the other is a p-type CNTFET. COPYRIGHT: (C)2007,JPO&INPIT
Abstract:
PROBLEM TO BE SOLVED: To provide a trigate field effect transistor provided with a fin-shaped semiconductor body with a channel region and source/drain regions on either side of the channel region. SOLUTION: Thick gate dielectric layers separate the top surface and opposing sidewalls of the channel region from the gate conductor to suppress conductivity in the channel planes. A thin gate dielectric layer separates the upper corners of the channel region from the gate dielectric to optimize conductivity in the channel corners. To further emphasize the electric current in the channel corners, the source/drain regions can be formed only in the upper corners of the semiconductor body. Alternatively, source/drain extension regions can be formed only in the upper corners of the semiconductor body adjacent to the gate conductor and deep source/drain diffusion regions can be formed in the ends of the semiconductor body. COPYRIGHT: (C)2007,JPO&INPIT
Abstract:
A field effect transistor (FET) and method of forming the FET comprises a substrate (101 ); a silicon germanium (SiGe) layer (103) over the substrate (103); a semiconductor layer (105) over and adjacent to the SiGe layer (103); an insulating layer (109a) adjacent to the substrate (101), the SiGe layer (103), and the semiconductor layer (105); a pair of first gate structures (111) adjacent to the insulating layer (1 09a); and a second gate structure (113) over the insulating layer (109a). Preferably, the insulating layer (109a) is adjacent to a side surface of the SiGe layer (103) and an upper surface of the semiconductor layer (105), a lower surface of the semiconductor layer (105), and a side surface of the semiconductor layer (105). Preferably, the SiGe layer (103) comprises carbon. Preferably, the pair of first gate structures (111) are substantially transverse to the second gate structure (113). Additionally, the pair of first gate structures (111) are preferably encapsulated by the insulating layer (109a).
Abstract:
A structure for a transistor that includes an insulator (10) and a silicon structure on the insulator. The silicon structure includes a central portion (155) and Fins (250) extending from ends of the central portion. A first gate (50) is positioned on a first side of the central portion of the silicon structure. A strain-producing layer (11) could be between the first gate (50) and the first side of the central portion (155) of the silicon structure and a second gate (160) is on a second side of the central portion (155) of the silicon structure.
Abstract:
Methods for forming a spacer (44) for a first structure (24, 124), such as a gate structure of a FinFET, and at most a portion of a second structure (14), such as a fin, without detrimentally altering the second structure. The methods generate a first structure (24) having a top portion (30, 130) that overhangs an electrically conductive lower portion (32, 132) and a spacer (44) under the overhang (40, 140). The overhang (40, 140) may be removed after spacer processing. Relative to a FinFET, the overhang protects parts of the fin (14) such as regions adjacent and under the gate structure (24, 124) , and allows for exposing sidewalls of the fin (14) to other processing such as selective silicon growth and implantation. As a result, the methods allow sizing of the fin (14) and construction of the gate structure (24, 124) and spacer without detrimentally altering (e.g., eroding by forming a spacer thereon) the fin (14) during spacer processing. A FinFET (100) including a gate structure (24, 124) and spacer (44) is also disclosed.
Abstract:
PROBLEM TO BE SOLVED: To provide the structure of a fin-type field-effect transistor (FinFET) having an embedded oxide layer 130 on a substrate 110, at least one-layer first structure 112 on the embedded oxide layer and at least one-layer second fin structure 114 on the embedded oxide layer and a manufacturing method of the same. SOLUTION: A first spacer 120 is adjacent to the fin structure 112, and a second spacer 118 is adjacent to the second fin structure 114. The area that the first spacer covers the first fin structure is wider than the area that the second spacer covers the second fin structure. As long as a fin has a wider spacer, a relatively narrow semiconductor doping area 113 is given, and as long as the fin has a narrower spacer, a relatively broader semiconductor doping area 115 is given. Therefore, a difference in doping between the first fin and the second fin takes place depending upon the spacers of different dimensions. The effective width of the second fin varies with the difference in doping between the first fin and the second fin as compared to the first fin. COPYRIGHT: (C)2005,JPO&NCIPI
Abstract:
PROBLEM TO BE SOLVED: To provide an apparatus for biasing ultra-low voltage logic circuits. SOLUTION: An integrated circuit device includes multiple transistors and a global body bias circuit. The global body bias circuit includes a first transistor and second transistors connected in series between a power supply and second power supply or ground. The gate and source of the first transistor are connected to the second power supply. The drains and bodies of the first and second transistors are connected to form an output connected to the bodies of the other transistors within the integrated circuit device. COPYRIGHT: (C)2003,JPO
Abstract:
Accordingly, the present invention provides a double gated transistor and a method for forming the same that results in improved device performance and density. The preferred embodiment of the present invention uses provides a double gated transistor with asymmetric gate doping, where one of the double gates is doped degenerately n-type and the other degenerately p-type. By doping on of the gates n-type, and the other p-type, the threshold voltage of the resulting device is improved. In particular, by asymmetrically doping the two gates, the resulting transistor can, with adequate doping of the body, have a threshold voltage in a range that enables low-voltage CMOS operation. For example, a transistor can be created that has a threshold voltage between 0V and 0.5V for nFETs and between 0 and -0.5V for pFETs.