摘要:
An edge defining method is employed in the fabrication of narrow electrical patterns for VLSI circuits. The method is particularly employable in the formation of inlay MOSFET transistors having extremely narrow gate widths. The method is also particularly amenable to the fabrication of both symmetrical and non-symmetrical MOSFET devices on the same VLSI circuit chip. The inlay transistor structure is also employed to fabricate NOR and NAND type "ladder" networks and to join vertically and horizontally adjacent semiconductor devices.
摘要:
A self-aligned process is described for depositing gate electrode material in an inlay field effect transistor. The process particularly provides means for inclusion of lightly doped source and drain extensions to minimize high field effects in the channel region. The process described herein is also particularly useful for providing source and drain contact metal which also acts as an ion implantation mask layer during several of the process steps. The method described herein is usable in conventional VLSI fabrication production facilities.
摘要:
A MOSFET includes a first SiC semiconductor contact layer, a SiC semiconductor channel layer supported by the first SiC contact layer, and a second SiC semiconductor contact layer supported by the channel layer. The second contact and channel layers are patterned to form a plurality of gate region grooves therethrough. Each of the gate region grooves includes a base surface and side surfaces which are covered with groove oxide material. A plurality of metal gate layers are provided, each being supported in a respective one of the plurality of grooves. A plurality of deposited oxide layers are provided, each in a respective one of the grooves so as to be supported by a respective one of the plurality of metal gate layers. A first metal contact layer is applied to the surface of the first SiC contact layer, and a second metal contact layer is applied to a portion of the surface of the second SiC contact layer.
摘要:
Combustion in a gas turbine is controlled through use of flame spectroscopy in order to achieve low NO.sub.x emissions in the exhaust. By detecting and monitoring the combustion flame in the turbine to determine intensity of ultraviolet spectral lines, and dynamically adjusting the fuel/air ratio of the fuel mixture such that this intensity remains below a predetermined level associated with a desired low level of NO.sub.x emissions, the engine produces significantly reduced NO.sub.x emissions in its exhaust but at a sufficiently high combustion flame temperature to avoid any undue risk of flame-out, thereby assuring stable, safe and reliable operation.
摘要:
A two dimensional mosaic scintillation X-ray or Gamma ray detector has many mosaic elements. A reflecting means, e.g., an epoxy with TiO.sub.2, is disposed between the elements to reduce optical cross-talk. The elements have wide narrow ends and either the wide ends or the narrow ends can receive the incident X-rays. A photodetector is optically coupled to the remaining ends either by being directly secured thereto or by way of a lens or optical fibers. The detector has communicating wide and narrow grooves and can be made by first forming the wide grooves from a first side and then forming the narrow grooves from the second side.
摘要:
A metal for fabricating contact structures through via openings in VLSI circuits employs a dual layer of refractory metal. A thin titanium layer is deposited, over which a molybdenum layer is formed. An annealing treatment further improves contact resistance characteristics. The method results in a contact structure which exhibits desirable properties of thermal compatibility, step coverage, contact resistance and improved processing characteristics.
摘要:
A method of making an integrated circuit is described. The method includes providing a substrate of single crystal silicon semiconductor material having low minority carrier lifetime, forming an insulating layer of silicon dioxide overlying a major surface of the substrate, forming a plurality of apertures in the insulating layer which expose a plurality of selected portions of the major surface of the substrate, and epitaxially growing a layer of silicon on each of the selected portions of the major surfaces of the substrate.
摘要:
A method of forming in a substrate of monocrystalline silicon semiconductor material having a major surface, a plurality of islands of silicon each including an active region of the substrate adjacent the major surface and surrounded by a body of silicon dioxide separating the islands from the substrate is described.
摘要:
A detection system for detecting gamma rays including a scintillator crystal for receiving at least one gamma ray and generating at least one ultraviolet ray and an avalanche photodiode for detecting the ultraviolet ray. The avalanche photodiode includes: a substrate having a first dopant; a first layer having a second dopant, positioned on top of the substrate; a passivation layer for providing electrical passivation on a surface of the avalanche photodiode; a phosphorous silicate glass layer for limiting mobile ion transport, positioned above of the first layer; and a pair of metal electrodes for providing an ohmic contact wherein a first electrode is positioned below the substrate and a second electrode is positioned above the first layer. The avalanche photodiode comprises a first sidewall and a second sidewall forming a sloped mesa shape.
摘要:
Intensity of optical emission from a combustion flame within a gas turbine combustor is monitored through an optical window in the combustor wall by a primary detector. Because the window is susceptible to becoming coated with deposits during combustor operation, compensation for presence of a coating is achieved by directing illumination from an optical signal source, such as a silicon carbide light-emitting diode, into the window for internal reflection at an optical interface defined by the combustion side surface. A compensation detector, such as a silicon carbide photodiode, detects intensity of the internally reflected illumination as an indicator of the window coating thickness. The compensation detector is located at a non-combustion side of the window, along with a reference detector that responds to intensity of optical signal source illumination reflected from the non-combustion side surface of the window. An AC coupled differential synchronous detector circuit processes the compensation detector and reference detector output signals to compensate the primary detector output signals for the coating.