Abstract:
A method is provided for eliminating uneven heating of substrate active areas during laser thermal annealing (LTA) due to variations in gate electrode density. Embodiments include adding dummy structures, formed simultaneously with the gate electrodes, to “fill in” the spaces between isolated gate electrodes, such that the spacing between the gate electrodes and the dummy structures is the same as the spacing between the densest array of device structures on the substrate surface. Since the surface features (i.e., the gate electrodes and the dummy structures) appear substantially uniform to the LTA laser, the laser radiation is uniformly absorbed by the substrate, and the substrate surface is evenly heated.
Abstract:
A method of forming a semiconductor device includes forming a fin on an insulating layer, where the fin includes a number of side surfaces, a top surface and a bottom surface. The method also includes forming a gate on the insulating layer, where the gate has a substantially U-shaped cross-section at a channel region of the semiconductor device.
Abstract:
Enantiomeric resolution is realized by combining an electrochemical method with ligand exchange (LE) in a novel electrochemical method named chiral ligand exchange potentiometry. Chiral selector ligands preferentially recognize certain enantiomers and undergo ligand exchange with the enantiomeric labile coordination complexes to form diastereoisomeric complexes. These complexes can form in solution and be recognized by an unmodified electrode, or they can be immobilized on the surface of a modified electrode (chiral sensor) incorporated with the chiral selector ligand by polysiloxane monolayer immobilization (PMI). Considerable stereoselectivity occurs in the formation of these diastereoisomeric complexes, and their net charges (Nernst factors) are different, thus enabling enantiomers to be distinguished by potentiometric electrodes without any pre-separation processes.
Abstract:
Dopant deactivation, particularly at the Si/silicide interface, is avoided by forming deep source/drain implants after forming silicide layers on the substrate and activating the source/drain regions by laser thermal annealing. Embodiments include forming source/drain extensions, forming metal silicide layers on the substrate surface and gate electrode, forming preamorphized regions under the metal silicide layers in the substrate, ion implanting to form deep source/drain implants overlapping the preamorphized regions and extending deeper into the substrate then the preamorphized regions, and laser thermal annealing to activate the deep source/drain regions.
Abstract:
A method of forming a gate in a FinFET device includes forming a fin on an insulating layer, forming source/drain regions and forming a gate oxide on the fin. The method also includes depositing a gate material over the insulating layer and the fin, depositing a barrier layer over the gate material and depositing a bottom anti-reflective coating (BARC) layer over the barrier layer. The method further includes forming a gate mask over the BARC layer, etching the BARC layer, where the etching terminates on the barrier layer, and etching the gate material to form the gate.
Abstract:
A punch-through diode transient suppression device has a base region of varying doping concentration to improve leakage and clamping characteristics. The punch-through diode includes a first region comprising an n+ region, a second region comprising a p− region abutting the first region, a third region comprising a p+ region abutting the second region, and a fourth region comprising an n+ region abutting the third region. The peak dopant concentration of the n+ layers should be about 1.5E18 cm−3, the peak dopant concentration of the p+ layer should be between about 1 to about 5 times the peak concentration of the n+ layer, and the dopant concentration of the p− layer should be between about 0.5E14 cm−3 and about 1.OE17 cm−3. The junction depth of the fourth (n+) region should be greater than about 0.3 &mgr;m. The thickness of the third (p+) region should be between about 0.3 &mgr;m and about 2.0 &mgr;m, and the thickness of the second (p−) region should be between about 0.5 &mgr;m and about 5.0 &mgr;m.
Abstract:
A semiconductor-on-insulator (SOI) device. The SOI device includes a substrate having a buried oxide layer disposed thereon and an active layer disposed on the buried oxide layer. The active layer has an active region defined by isolation regions, the active region having a source and a drain with a body disposed therebetween. The source and the drain have a selectively grown silicon-germanium region disposed under an upper layer of selectively grown silicon. The silicon-geranium regions form heterojunction portions respectively along the source/body junction and the drain/body junction.
Abstract:
A semiconductor device is formed by providing a semiconductor substrate comprising a strained lattice semiconductor layer at an upper surface thereof and having a pre-selected amount of lattice therein, forming a thin buffer/interfacial layer of a low-k dielectric material on the upper surface of the semiconductor substrate, and forming a layer of a high-k dielectric material on the thin buffer/interfacial layer of a low-k dielectric material. Embodiments include forming the thin buffer/interfacial layer and high-k layer at a minimum temperature sufficient to effect formation of the respective dielectric layer without incurring, or at least minimizing, strain relaxation of the strained lattice semiconductor layer.
Abstract:
A semiconductor-on-insulator (SOI) device. The SOi device includes a substrate, an insulator layer disposed on the substrate and an active region disposed on the insulator layer. The active region includes a source, a drain, and a body disposed therebetween. The source and body form an abrupt or hyperabrupt source/body junction. A gate is disposed on the body to operatively form a transistor. An implanted region forms an interface between the body and the drain, the implanted region formed by tilted atom implantation in a direction towards the active region and under the gate from an angle tilted towards the drain with respect to vertical, the implanted region resulting in the formation of a graded drain/body junction. Also disclosed is a method of fabricating the SOI device.
Abstract:
Semiconductor devices with reduced NiSi/Si interface contact resistance are fabricated by forming preamorphized regions in a substrate at a depth overlapping the subsequently formed NiSi/Si interface, ion implanting impurities to form deep source/drain implants overlapping the preamorphized regions deeper in the substrate and laser thermal annealing to activate the deep source/drain regions. Nickel silicide layers are then formed in a main surface of the substrate and on the gate electrode. Embodiments include forming deep source/drain regions with an activated impurity concentration of 1×1020 to 1×1021 atoms/cm3 at the NiSi/Si interface.