776 results about "Carbon alloy" patented technology

A method of modifying the surface of carbon materials such as vapor grown carbon nanofibers is provided in which silicon is deposited on vapor grown carbon nanofibers using a chemical vapor deposition process. The resulting silicon-carbon alloy may be used as an anode in a rechargeable lithium ion battery.

Semiconductor devices, e.g., heterojunction field effect transistors, fabricated with silicon-germnanium buffer layer and silicon-carbon channel layer structures. The invention provides a method of reducing threading defect density via reducing germanium content in a SiGe relaxed buffer layer on which a strained silicon channel layer is formed, by forming the strained silicon channel layer of a silicon-carbon alloy, e.g., containing less than about 1.5 atomic % C substitutionally incorporated in the Si lattice of the alloy.

A method is described for manufacturing an n-MOS semiconductor transistor. Recesses are formed in a semiconductor substrate adjacent a gate electrode structure. Silicon is embedded in the recesses via a selective epitaxial growth process. The epitaxial silicon is in-situ alloyed with substitutional carbon and in-situ doped with phosphorus. The silicon-carbon alloy generates a uniaxial tensile strain in the channel region between the source and drain, thereby increasing electron channel mobility and the transistor's drive current. The silicon-carbon alloy decreases external resistances by reducing contact resistance between source/drain and silicide regions and by reducing phosphorous diffusivity, thereby permitting closer placement of the transistor's source/drain and channel regions.

A MOSFET structure utilizing strained silicon carbon alloy and fabrication method thereof. The MOSFET structure includes a substrate, a graded SiGe layer, a relaxed buffer layer, a strained silicon carbon alloy channel layer, a gate dielectric layer, a polysilicon gate electrode (or metal gate electrode) and a source/drain region.

While embedded silicon germanium alloy and silicon carbon alloy provide many useful applications, especially for enhancing the mobility of MOSFETs through stress engineering, formation of alloyed silicide on these surfaces degrades device performance. The present invention provides structures and methods for providing unalloyed silicide on such silicon alloy surfaces placed on semiconductor substrates. This enables the formation of low resistance contacts for both mobility enhanced PFETs with embedded SiGe and mobility enhanced NFETs with embedded Si:C on the same semiconductor substrate. Furthermore, this invention provides methods for thick epitaxial silicon alloy, especially thick epitaxial Si:C alloy, above the level of the gate dielectric to increase the stress on the channel on the transistor devices.

A first dielectric layer is formed over a PFET gate and an NFET gate, and lithographically patterned to expose a PFET area, while covering an NFET area. Exposed PFET active area is etched and refilled with a SiGe alloy, which applies a uniaxial compressive stress to a PFET channel. A second dielectric layer is formed over the PFET gate and the NFET gate, and lithographically patterned to expose the NFET area, while covering the PFET area. Exposed NFET active area is etched and refilled with a silicon-carbon alloy, which applies a uniaxial tensile stress to an NFET channel. Dopants may be introduced into the SiGe and silicon-carbon regions by in-situ doping or by ion implantation.

According to the present invention, wirings, electrodes or the like formed from two films (an ITO film and an aluminum film) which are incompatible with each other are connected, and low power consumption is realized even if a display screen size is increased in an active matrix display device. A three-layer structure or a two-layer structure is employed to obtain a favorable ohmic contact with ITO. The structure of a wiring or an electrode includes a layer having an aluminum carbon alloy which does not react with ITO. The wiring or an electrode is contacted with ITO.

The invention provides a lithium ion battery electrolyte and a high-energy-density lithium ion battery using the same. The lithium ion battery electrolyte comprises a non-aqueous organic solvent, a lithium salt and additives. The additives comprise a negative electrode film-forming additive, a nitrile or ether nitrile compound, an acid anhydride compound and a lithium salt type additive. Accordingto the lithium ion battery electrolyte, 0.3-20wt% of the negative electrode film-forming additive such as vinylene carbonate and/or fluorocarbonate can form an excellent SEI film on a carbon-containing negative electrode, a silicon-containing negative electrode or a silicon carbon alloy negative electrode and the like, thereby stabilizing the negative electrode and ensuring excellent battery performance; 0.2-6.5wt% of the nitrile or ether nitrile compound, the acid anhydride compound and a combination of them can complex metal ions of a positive electrode or form a protective film on the surface of the positive electrode, thereby stabilizing the positive electrode and improving battery performance; and the 0.5-3 wt% of the lithium salt type additive in the lithium ion battery electrolytecan lower the impedance of the battery so as to improve the low temperature performance of the battery or improve the high temperature performance of the battery.

The invention provides an external thin-wall vacuum duct maglev traffic system of a power system. A vacuum duct with small wall thickness is adopted, a linear motor coil, a track levitation mechanism and other communication, detecting and control devices are arranged outside the duct and provide power, levitation force and control to vehicles in the duct in the state that one thin duct wall is used for separation. The material of the duct wall is required to have no effect on the electromagnetic field of a linear motor and the levitation magnetic field of a levitation device, for example, non-magnetized stainless steel, carbon alloy, glass fiber reinforced plastics or high-strength organic materials are adopted, or the duct is made of a composite material. The arrangement has the advantages that the installation construction of a linear motor stator and the levitation mechanism can be conveniently performed outside the duct; routine maintenance and repair during operation can also be performed outside the duct; mechatronic systems can be well cooled, and heat aggregation in the vacuum duct is avoided; and the space in the duct is not occupied; and the construction, maintenance and system operation costs of the vacuum duct high-speed maglev traffic system can be lowered.

A silicon/carbon alloy may be formed in drain and source regions, wherein another portion may be provided as an in situ doped material with a reduced offset with respect to the gate electrode material. For this purpose, in one illustrative embodiment, a cyclic epitaxial growth process including a plurality of growth/etch cycles may be used at low temperatures in an ultra-high vacuum ambient, thereby obtaining a substantially bottom to top fill behavior.

Crystal lattice dislocations in material surrounding trench capacitors and other trench structures are avoided by alteration of stresses such as decreasing compressive stresses and/or development of persistent tensile forces within material deposited in the trench and thus at the material interface formed by the trench. Such alteration of stresses is achieved by volume reduction of a film deposited in the trench. The material is preferably a hydrogenated nitride of silicon, boron or silicon-carbon alloy which may be reduced in volume by partial or substantially complete dehydrogenation during subsequent heat treatment at temperatures where the film will exhibit substantial creep resistance. The amount of volume reduction can be closely controlled by control of concentration of hydrogen or other gas or volatile material in the film. Further fine adjustment of stresses can be achieved in combination with this mechanism by volume reduction of other materials which may be used, in part, to confine the film through other mechanisms such as annealing.

The invention discloses a silicon-carbon alloy cathode material used in a lithium ion battery, and a preparation method thereof. The invention aims at improving the cycling performance of the silicon-carbon alloy cathode material. According to the silicon-carbon alloy cathode material, silicon powder particles with particle sizes of 20-250nm are adopted as substrates; carbon nano-tubes and amorphous carbon are coated on the surfaces of the substrates; the thicknesses of the carbon nano-tubes and amorphous carbon are 100-300nm; the carbon nano-tubes and amorphous carbon are short-strip-shaped, block-shaped, or layered hollow-structured cracked carbon. The preparation method provided by the invention comprises steps of: slurry preparing, drying and powder preparing, calcining, and chemical vapor depositing. Compared to prior arts, the silicon-carbon alloy cathode material is advantaged in high specific capacity, good cycling performance, a capacity greater than 1000mAh/g, and a capacity maintenance rate above 90% with 20 times of circulation. The preparation method provided by the invention is advantaged in simple technology and low raw material cost. The material and the method provided by the invention are suitable for various high-capacity lithium ion battery cathode materials.

The invention discloses a nickel-base high-temperature alloy GH4720Li smelting technique. The technique comprises the following step: carrying out smelting by a triple (VIM+VAR+VAR) smelting technique according to the composition requirements for the GH4720Li alloy (No.1 or No.2 Ni, vacuum-degassed Cr, sponge Ti, Al beans, metal Co, NiW alloy, NiMo alloy, carbon, NiMg alloy, NiB alloy and zirconium sponge), thereby obtaining the GH4720Li high-temperature alloy cast ingot. The novel triple smelting technique enhances the metallurgical quality of the GH4720Li alloy; especially the gamma' phase forming elements Al and Ti for performing the main reinforcement function in the GH4720Li alloy have high composition control precision and favorable uniformity; and the other alloy elements have the advantages of less segregation and high composition control precision. The obtained alloy has impurity element content, and the properties have long-term stability at 650-750 DEG C.

The invention discloses a silicon-carbon alloy cathode material for lithium ion batteries and a preparation method thereof. The invention aims to enhance the specific capacity of the lithium ion battery and have excellent cycle performance. The cathode material comprises the matrix which is physically compounded from a silicon alloy and graphite powder, and the surface of the cathode material is coated with a carbon material. The preparation method comprises the following steps: mixing aluminium powder, asphalt and simple substance silicon powder, adding graphite, mixing, drying and roasting to obtain the silicon-carbon alloy composite material. Compared with the prior art, the reversible specific capacity of the silicon-carbon alloy cathode material is higher than 590 mAh/g, the first cycle coulombic efficiency is higher than 75%, and the capacity conservation rate after 60 cycles is higher than 92%; the silicon-carbon alloy cathode material has excellent lithium embedding and removing capacity, and high cycle stability; and the preparation technique has the advantages of simple operation and low cost, and is suitable for high-capacity lithium ion battery cathode materials for various portable devices.

The invention discloses a passivation contact electrode structure and an applicable solar cell and a manufacturing method thereof. The electrode structure comprises a doped semiconductor layer and a copper electrode, wherein the doped semiconductor layer is deposited on a crystalline silicon substrate, the copper electrode is arranged on the doped semiconductor layer, the doped semiconductor is any one of polycrystalline silicon, microcrystalline silicon or microcrystalline silicon carbon alloy, and the thickness of the doped semiconductor is 5 to 100 nm. In an implementation process, the applicable solar cell is arranged on the back side or the two sides of the crystalline silicon substrate and comprises the passivation contact electrode structure. The invention further discloses a manufacturing of the solar cell with the passivation contact electrode structure. According to the passivation contact electrode structure disclosed by the invention, a surface composite efficiency of photo-induced carriers is reduced by passivating contact among all the metal electrodes, and a more complete passivation effect is achieved; meanwhile, compared with an existing technological method, massproduction of the passivation contact electrode structure disclosed by the invention is achieved; furthermore, electroplated copper is utilized as a conducting layer to replace silver, so that cell production cost is reduced.