Abstract:
A p-type field effect transistor (PFET) (10) and an n-type field effect transistor (NFET) (12) of an integrated circuit are provided. A first strain is applied to the channel region (20) of the PFET (10) but not the NFET (12) via a lattice-mismatched semiconductor layer such as silicon germanium disposed in source and drain regions (111) of only the PFET (10) and not of the NFET.(12) A process of making the PFET (10) and NFET (12) is provided. Trenches are etched in the areas to become the source and drain regions (111) of the PFET and a lattice-mismatched silicon germanium layer (121) is grown epitaxially therein to apply a strain to the channel region of the PFET adjacent thereto. A layer of silicon (14) can be grown over the silicon germanium layer (121) and a salicide (68) formed from the layer of silicon to provide low-resistance source and drain regions (111).
Abstract:
A semiconductor device and method of manufacturing a semiconductor device. The semiconductor device includes channels for a pFET and an nFET. A SiGe layer is selectively grown in the source and drain regions of the pFET channel and a Si:C layer is selectively grown in source and drain regions of the nFET channel. The SiGe and Si:C layer match a lattice network of the underlying Si layer to create a stress component. In one implementation, this causes a compressive component in the pFET channel and a tensile component in the nFET channel.
Abstract:
PROBLEM TO BE SOLVED: To provide a transistor having a dielectric stressor for applying in-plane shear stress. SOLUTION: A chip is provided which includes an active semiconductor region and a field effect transistor ("FET") having a channel region, a source region, and a drain region all arranged within the active semiconductor region. The FET has a longitudinal direction in the lengthwise direction of the channel region, and a transverse direction in the widthwise direction of the channel region. A first dielectric stressor element having a horizontally extending upper surface extends below a portion of the active semiconductor region, such as a northwest portion of the active semiconductor region. A second dielectric stressor element having a horizontally extending upper surface extends below one second portion of the active semiconductor region, such as a southeast portion of the active semiconductor region. Each of the first and second dielectric stressor elements shares an edge with the active semiconductor region, and the edges extending in directions away from the upper surface. COPYRIGHT: (C)2007,JPO&INPIT
Abstract:
PROBLEM TO BE SOLVED: To provide a MOSFET which dynamically varies the threshold voltage on an SOI. SOLUTION: When a body control contact is provided adjacent to a transistor and between the transistor and a contact to a substrate or a well in which the transistor is formed, the substrate of the transistor can be connected to and disconnected from a zero (ground) or substantially arbitrary low voltage in accordance with control signals applied to the gate of the transistor to cause the transistor to exhibit a variable threshold, resulting in good performance maintained even at low supply voltages and reduced power consumption/dissipation, which are particularly advantageous in portable electronic devices. Floating body effects (when the transistor substrate is disconnected from a voltage source in the "on" state) are avoided because the substrate is discharged when the transistor is switched to the "off" state. The transistor configuration can be used with n-type and p-type transistors in the case of complementary pairs or the like. COPYRIGHT: (C)2005,JPO&NCIPI
Abstract:
PROBLEM TO BE SOLVED: To provide a semiconductor nanowire device for achieving a high on current for a high-performance complementary-metal oxide semiconductor (CMOS) circuit. SOLUTION: A semiconductor nanowire 32 having semiconductor pads 33A, 37A at both the ends is suspended over a substrate. While the semiconductor nanowire is being subjected to longitudinal stress by a stress-generating liner section, a gate dielectric 36 and a gate electrode 38 are formed on a middle section of the semiconductor nanowire. Since a strained state of the semiconductor nanowire is fixed by formation of the gate dielectric and the gate electrode, a middle section of the semiconductor nanowire is subjected to inherent longitudinal internal stress after removing the stress-generating liner. Source and drain regions 33B and 37B are formed in the semiconductor pads, thus obtaining a semiconductor nanowire transistor. A middle-of-line (MOL) dielectric layer may be formed directly on the source and drain pads. COPYRIGHT: (C)2011,JPO&INPIT
Abstract:
PROBLEM TO BE SOLVED: To provide a structure for adding an effective stress without influencing the arrangement of an element separation region to improve characteristics of a field effect transistor having a channel region, a source region, and a drain region which are arranged in an active semiconductor region. SOLUTION: A buried dielectric stressor element 102 having a horizontally extending upper surface is arranged below one part of an active semiconductor region 104 separated by a trench separation region 106. This dielectric stressor consists of an oxide film by oxidation of a porous silicon, and generates a compression or extension stress based on the degree of porous formation. COPYRIGHT: (C)2007,JPO&INPIT