Abstract:
Hybrid orientation substrates allow the fabrication of complementary metal oxide semiconductor (CMOS) circuits in which the n-type field effect transistors (nFETs) are disposed in a semiconductor orientation which is optimal for electron mobility and the p-type field effect transistors (pFETs) are disposed in a semiconductor orientation which is optimal for hole mobility. This invention discloses that the performance advantages of FETs formed entirely in the optimal semiconductor orientation may be achieved by only requiring that the device's channel be disposed in a semiconductor with the optimal orientation. A variety of new FET structures are described, all with the characteristic that at least some part of the FET's channel has a different orientation than at least some part of the FET's source and/or drain. Hybrid substrates into which these new FETs might be incorporated are described along with their methods of making.
Abstract:
A semiconductor device such as a complementary metal oxide semiconductor (CMOS) comprising at least one FET that comprises a gate electrode comprising a metal carbide and method of fabrication are provided. The CMOS comprises dual work function metal gate electrodes whereby the dual work functions are provided by a metal and a carbide of a metal.
Abstract:
A micro-electromechanical (MEM) RF switch provided with a deflectable membrane (60) activates a switch contact or plunger (40). The membrane incorporates interdigitated metal electrodes (70) which cause a stress gradient in the membrane when activated by way of a DC electric field. The stress gradient results in a predictable bending or displacement of the membrane (60), and is used to mechanically displace the switch contact (30). An RF gap area (25) located within the cavity (250) is totally segregated from the gaps (71) between the interdigitated metal electrodes (70). The membrane is electrostatically displaced in two opposing directions, thereby aiding to activate and deactivate the switch. The micro-electromechanical switch includes: a cavity (250); at least one conductive path (20) integral to a first surface bordering the cavity; a flexible membrane (60) parallel to the first surface bordering the cavity (250), the flexible membrane (60) having a plurality of actuating electrodes (70); and a plunger (40) attached to the flexible membrane (60) in a direction away from the actuating electrodes (70), the plunger (40) having a conductive surface that makes electric contact with the conductive paths, opening and closing the switch.
Abstract:
A micro-electromechanical switch (MEMS) having a deformable elastomeric element (1) which exhibits a large change in conductivity with a small amount of displacement. The deformable elastomeric element (1) is displaced by an electrostatic force that is applied laterally resulting in a small transverse displacement. The transversal displacement, in turn, pushes a metallic contact (7) against two conductive paths (5, 6), allowing passage of electrical signals. The elastomer (1) is provided on two opposing sids with embedded metallic elements (9, 10), such as impregnated metallic rods, metallic sheets, metallic particles, or conductive paste. Actuation electrodes (18, 8) are placed parallel to the conductive sides of the elastomer. A voltage applied between the conductive side of the elastomer and the respective actuation electrodes (18, 8) generate the electrostatic attractive force that compresses the elastomer (1), creating the transverse displacement that closes the MEMS. The elastomeric based MEMS extends the lifetime of the switch by extending fatigue life of the deformable switch elements.
Abstract:
A compound metal comprising TiC which is a p-type metal having a workfunction of about 4.75 to about 5.3, preferably about 5, eV that is thermally stable on a gate stack comprising a high k dielectric and an interfacial layer is provided as well as a method of fabricating the TiC compound metal. Furthermore, the TiC metal compound of the present invention is a very efficient oxygen diffusion barrier at 1000°C allowing very aggressive equivalent oxide thickness (EOT) and inversion layer thickness scaling below 14 Å in a p-metal oxide semiconductor (pMOS) device.
Abstract:
A semiconductor device such as a complementary metal oxide semiconductor (CMOS) comprising at least one FET that comprises a gate electrode comprising a metal carbide and method of fabrication are provided. The CMOS comprises dual work function metal gate electrodes whereby the dual work functions are provided by a metal and a carbide of a metal.
Abstract:
A method utilizing localized amorphization and recrystallization of stacked template layers is provided for making a planar substrate having semiconductor layers of different crystallographic orientations. Also provided are hybrid-orientation semiconductor substrate structures built with the methods of the invention, as well as such structures integrated with various CMOS circuits comprising at least two semiconductor devices disposed on different surface orientations for enhanced device performance.
Abstract:
Transistor devices having nanoscale material-based channels (e.g., carbon nanotube or graphene channels) and techniques for the fabrication thereof are provided. In one aspect, a transistor device is provided. The transistor device includes a substrate; an insulator on the substrate; a local bottom gate embedded in the insulator, wherein a top surface of the gate is substantially coplanar with a surface of the insulator; a local gate dielectric on the bottom gate; a carbon-based nanostructure material over at least a portion of the local gate dielectric, wherein a portion of the carbon-based nanostructure material serves as a channel of the device; and conductive source and drain contacts to one or more portions of the carbon-based nanostructure material on opposing sides of the channel that serve as source and drain regions of the device.
Abstract:
Es wird ein Verfahren bereitgestellt, um (i) eine zusätzliche Steuerung in einen Prozess für ein Spalling von Material einzubringen, um so sowohl die Initiierung von Rissen als auch die Ausbreitung von Rissen zu verbessern, und um (ii) den Bereich von auswahlbaren Spalling-Tiefen zu vergrößern. In einer Ausführungsform beinhaltet das Verfahren ein Bereitstellen einer Stressorschicht auf einer Oberfläche eines Grundsubstrats bei einer ersten Temperatur, welche die Raumtemperatur ist. Als Nächstes wird das Grundsubstrat, das die Stressorschicht beinhaltet, auf eine zweite Temperatur gebracht, die niedriger als Raumtemperatur ist. Das Grundsubstrat wird bei der zweiten Temperatur abgeplatzt, um eine abgeplatzte Materialschicht zu bilden. Danach wird die abgeplatzte Materialschicht auf Raumtemperatur, d. h. die erste Temperatur, zurückgebracht.
Abstract:
Method to (i) introduce additional control into a material spalling process, thus improving both the crack initiation and propagation, and (ii) increase the range of selectable spalling depths are provided. In one embodiment, the method includes providing a stressor layer on a surface of a base substrate at a first temperature which is room temperature. Next, the base substrate including the stressor layer is brought to a second temperature which is less than room temperature. The base substrate is spalled at the second temperature to form a spalled material layer. Thereafter, the spalled material layer is returned to room temperature, i.e., the first temperature.