Abstract:
PROBLEM TO BE SOLVED: To reduce the formation of misfit dislocation that may reduce the charge mobility and device performance. SOLUTION: There is provided a method of manufacturing a semiconductor structure and a semiconductor device, more specifically, an N-type FET device. The device includes a stress receiving layer provided on a stress inducing layer via a material at an interface between the layers, which reduces the occurrence and propagation of misfit dislocation in the structure. The stress receiving layer includes silicon (Si), the stress inducing layer includes silicon-germanium (SiGe), and the material includes carbon given by doping both layers during the period of the formation of the device. The carbon can be doped over the entire SiGe layer. COPYRIGHT: (C)2008,JPO&INPIT
Abstract:
PROBLEM TO BE SOLVED: To provide a transistor having a stress-producing dielectric element which underlies the entire undersurface of an active semiconductor region. SOLUTION: A compressive stress is applied to a channel region of a PFET by a structure including an independent stress-producing dielectric element that entirely underlies the bottom surface of an active semiconductor region in which a source, a drain and a channel region of the PFET are disposed. Specifically, the stress-producing dielectric element includes a region of a collapsed oxide which contacts the entire bottom surface of the active semiconductor region so that it has an area of the same spread as an area of the bottom surface. Bird beak-like oxide regions at the edges of the stress-producing dielectric element apply an upward force to the edges of the stress-producing dielectric element to provide a compressive stress to the channel region of the PFET. COPYRIGHT: (C)2007,JPO&INPIT
Abstract:
A method for fabricating a semiconductor device, includes providing a strained silicon on insulator (SSOI) structure, the SSOI structure comprises, a dielectric layer disposed on a substrate, a silicon germanium layer disposed on the dielectric layer, and a strained semiconductor material layer disposed directly on the silicon germanium layer, forming a plurality of fins on the SSOI structure, forming a gate structure over a portion of at least one fin in a nFET region, forming a gate structure over a portion of at least one fin in a pFET region, removing the gate structure over the portion of the at least one fin in the pFET region, removing the silicon germanium layer exposed by the removing, and forming a new gate structure over the portion of the at least one fin in the pFET region, such that the new gate structure surrounds the portion on all four sides.
Abstract:
A SOI STRUCTURE AND A METHOD FOT ITS FABRICATION, IN WHICH A STRAINED SILICON LAYER LIES DIRECTLY ON AN INSULATOR LAYER, CONTRARY TO THE PRIOR REQUIREMENT FOR STRAINED-Si LAYERS TO LIE DIRECTLY ON A STRAIN-INDUCING (E.G., SiGe) LAYER. THE METHOD GENERALLY ENTAILS THE FORMING A SILICON LAYER ON A STRAIN-INDUCING LAYER SO AS TO FORM A MULTILAYER STRUCTURE, IN WHICH THE STRAIN-INDUCING LAYER HAS A DIFFERENT LATTICE CONSTANT THAN SILICON SO THAT THE SILICON LAYER IS STRAINED AS A RESULT OF THE LATTICE MISMATCH WITH THE STRAIN-INDUCING LAYER. THE MULTILAYER STRUCTURE IS THEN BONDED TO A SUBSTRATE SO THAT AN INSULATING LAYER IS BETWEEN THE STRAINED SILICON LAYER AND THE SUBSTRATE, AND SO THAT THE STRAINED SILICON LAYER DIRECTLY CONTACTS THE INSULATING LAYER. THE STRAIN-INDUCING LAYER IS THEN REMOVED TO EXPOSE A SURFACE OF THE STRAINED SILICON LAYER AND YIELD A STRAINED SILICON-ON-INSULATOR STRUCTURE THAT COMPRISES THE SUBSTRATE, THE INSULATING LAYER ON THE SUBSTRATE, AND THE STRAINED SILICON LAYER ON THE INSULATING LAYER. AS A RESULT, THE METHOD YIELDS A STRAINED SILICON-ON-INSULATOR (SSOI) STRUCTURE IN WHICH THE STRAIN IN THE SILICON LAYER IS MAINTAINED BY THE SOI STRUCTURE. @ @ FIGURE 1
Abstract:
A method for fabricating a semiconductor device, includes providing a strained silicon on insulator (SSOI) structure, the SSOI structure comprises, a dielectric layer(20) disposed on a substrate(10), a silicon germanium layer(30) disposed on the dielectric layer(20), and a strained semiconductor material layer(40) disposed directly on the silicon germanium layer(30), forming a plurality of fins(43, 45) on the SSOI structure, forming a gate structure(50) over a portion of at least one fin in a nFET region, forming a gate structure(60) over a portion of at least one fin in a pFET region, removing the gate structure(60) over the portion of the at least one fin in the pFET region, removing the silicon germanium layer(30) exposed by the removing, and forming a new gate structure(90) over the portion of the at least one fin in the pFET region, such that the new gate structure(90) surrounds the portion on all four sides.
Abstract:
A strained Si CMOS structure is formed by steps which include forming a relaxed SiGe layer on a surface of a substrate; forming isolation regions and well implant regions in said relaxed SiGe layer; and forming a strained Si layer on said relaxed SiGe layer. These processing steps may be used in conjunction with conventional gate processing steps in forming a strained MOSFET structure.