34 results about "Tunnel injection" patented technology

A method of forming a highly doped layer of AlGaN, is practiced by first removing contaminants from a MBE machine. Wafers are then outgassed in the machine at very low pressures. A nitride is then formed on the wafer and an AlN layer is grown. The highly doped GaAlN layer is then formed having electron densities beyond 1×1020 cm−3 at Al mole fractions up to 65% are obtained. These levels of doping application of n-type bulk, and n / p tunnel injection to short wavelength UV emitters. Some applications include light emitting diodes having wavelengths between approximately 254 and 290 nm for use in fluorescent light bulbs, hazardous materials detection, water purification and other decontamination environments. Lasers formed using the highly doped layers are useful in high-density storage applications or telecommunications applications. In yet a further embodiment, a transistor is formed utilizing the highly doped layer as a channel.

A tunneling injection based Schottky source / drain memory cell comprising: a first semiconductor layer with a first conductivity type overlying an insulating layer, wherein the first semiconductor acts as a body region; a gate dielectric overlying the semiconductor layer; a gate electrode overlying the gate dielectric; a pair of spacers on sides of the gate electrodes; and a first Schottky barrier junction formed on a source region and a second Schottky barrier junction formed on a drain region on opposing sides of the body region. The source and the regions have an overlapping portion with the gate electrode and length of overlapping portion is preferably greater than about 5 AA. Interfacial layers are formed between the first and the second Schottky barrier regions.

The invention provides a low carbon and high performance series concrete special for tunnel spraying. The concrete is prepared by mixing different mineral admixtures of different mixing amounts and adopting a low water-binder ratio, a high efficiency water reducer and an alkali-free setting accelerator. The prepared concrete has the properties of high density, good workability and durability, and can satisfy the requirements of different surrounding rock grades for the early strength of sprayed concrete. In the invention, sprayed concrete density is determined according to an environmental comprehensive level, and then a gelling material formula is selected according to a density index. Designers and constructors can select different gelling material formulas and concrete proportions according to different environmental levels and surrounding rock levels. With the characteristics of low hydration heat, high density, good workability, etc., the concrete material also has the efficacy of reducing environmental pollution, improving work environment, reducing the rebound rate, saving engineering cost and the like. Thus, the energy can be saved, carbon emission and environmental pollution are reduced, and engineering cost is substantially saved.