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
Abstract:
A semiconductor device structure includes a gate structure disposed on a portion of substrate, source and drain regions disposed adjacent to the portion so as to form a channel region in the portion, and trench isolation regions located immediately adjacent to the source and drain regions. At least portions of the trench isolation regions include stress materials such that the materials generate shear stresses in the channel region.
Abstract:
A method of fabricating a semiconductor device structure, includes: providing a substrate, providing an electrode on the substrate, forming a recess in the electrode, the recess having an opening, disposing a small grain semiconductor material within the recess, covering the opening to contain the small grain semiconductor material, within the recess, and then annealing the resultant structure.
Abstract:
A stressed film applied across a boundary defined by a structure or a body (e.g. substrate or layer ) of semiconductor material provides a change from tensile to compressive stress in the semiconductor material proximate to the boundary and is used to modify boron diffusion rate during annealing and thus modify final boron concentrations and/or profiles/gradients. In the case of a field effect transistor, the gate structure may be formed with or without sidewalls to regulate the location of the boundary relative to source/drain, extension and/or halo implants. Different boron diffusion rates can be produced in the lateral and vertical directions and diffusion rates comparable to arsenic can be achieved. Reduction of junction capacitance of both nFETs and pFETs can be achieved simultaneously with the same process steps.