255results about How to "Lower forward voltage" patented technology

A low voltage laser device having an active region configured for one or more selected wavelengths of light emissions.

A semiconductor device including a Schottky diode of the trench-junction-barrier type having an integrated PN diode, and a corresponding method for manufacturing the device, are provided. An n layer is provided on an n^t substrate, and trenches are provided in the n layer. The trenches are provided with p-doped regions. The n^t substrate and the n layer carry a contact layer.

The present invention discloses through-hole vertical semiconductor devices and chips. The structure of an embodiment of through-hole vertical semiconductor devices and chips having static protection diodes is the following: a semiconductor epitaxial layer is bonded to the first surface of a supporting chip with static protection diode; the first-type cladding layer of the semiconductor epitaxial layer is electrically connected to a first electrode on the second surface of the supporting chip via a current spreading layer, a patterned electrode, a half-through-hole-metal-plug and a through-hole-metal-plug; the second-type cladding layer of the semiconductor epitaxial layer is electrically connected to a second electrode on the second surface of the supporting chip via a reflector/Ohmic/bonding layer and at least one through-hole-metal-plug. An external power source is electrically connected to the first and second electrodes without wire bonding.

Exemplary embodiments of the present invention disclose a light emitting diode including an n-type contact layer doped with silicon, a p-type contact layer, an active region disposed between the n-type contact layer and the p-type contact layer, a superlattice layer disposed between the n-type contact layer and the active region, the superlattice layer including a plurality of layers, an undoped intermediate layer disposed between the superlattice layer and the n-type contact layer, and an electron reinforcing layer disposed between the undoped intermediate layer and the superlattice layer. Only a final layer of the superlattice layer closest to the active region is doped with silicon, and the silicon doping concentration of the final layer is higher than that of the n-type contact layer.

A method is disclosed for preparing a substrate and epilayer for reducing stacking fault nucleation and reducing forward voltage (V_f) drift in silicon carbide-based bipolar devices. The method includes the steps of etching the surface of a silicon carbide substrate with a nonselective etch to remove both surface and sub-surface damage, thereafter etching the same surface with a selective etch to thereby develop etch-generated structures from at least any basal plane dislocation reaching the substrate surface that will thereafter tend to either terminate or propagate as threading defects during subsequent epilayer growth on the substrate surface, and thereafter growing a first epitaxial layer of silicon carbide on the twice-etched surface.

A Si substrate 1, a metal adhesion layer 2, a reflective metal film 3 comprising a multilayer of metallic material having a light reflectivity, a SiO₂ film 4, an ohmic contact portion 5 provided at a predetermined position of the SiO₂ film 4, a GaP layer 6 including a Mg-doped GaP layer 6A and a Zn-doped GaP layer 6B, a p-type GaInP interposed layer 7, a p-type AlGaInP cladding layer 8, an undoped MQW active layer 9, an n-type AlGaInP cladding layer 10, an n-type AlGaInP window layer 11, an n-type GaAs contact layer 12, a first electrode 13, and a second electrode 14 are formed. The ohmic contact portion 5 is distant from the light emitting part including the p-type AlGaInP cladding layer 8, the undoped MQW active layer 9 and the n-type AlGaInP cladding layer 10 by not less than 300 nm.

A portion of a top semiconductor layer of a semiconductor-on-insulator (SOI) substrate is patterned into a semiconductor fin having substantially vertical sidewalls. A portion of a body region of the semiconductor fin is exposed on a top surface of the semiconductor fin between two source regions having a doping of a conductivity type opposite to the body region of the semiconductor fin. A metal semiconductor alloy portion is formed directly on the two source regions and the top surface of the exposed body region between the two source regions. The doping concentration of the exposed top portion of the body region may be increased by ion implantation to provide a low-resistance contact to the body region, or a recombination region having a high-density of crystalline defects may be formed. A hybrid surface semiconductor-on-insulator (HSSOI) metal-oxide-semiconductor-field-effect-transistor (MOSFET) thus formed has a body region that is electrically tied to the source region.

A composite high voltage schottky rectifier is revealed that provides a forward voltage slightly larger than a low voltage schottky rectifier combined with a high voltage breakdown capability. The composite rectifier can be formed from the combination of a low voltage schottky rectifier, a high voltage mosfet, and a few small passive components. A quarter bridge primary switching network similar in some ways to a half bridge primary switching network is revealed. The quarter bridge network consists of four switches with voltage stress equal to half the line voltage and the network applies one quarter of the line voltage to a primary magnetic circuit element network thereby reducing the number of primary winding turns required to one quarter by comparison to a common full bridge network. A synchronously switched buck post regulator is revealed for multi-output forward converters. The synchronously switched buck post regulator accomplishes precise independent load regulation for each output and reduced magnetics volume by using a coupled inductor with a common core for all outputs plus a second smaller inductor for each output except the highest voltage output. An improved capacitor coupled floating gate drive circuit is revealed that provides an effective drive mechanism for a floating or high side switch without the use of level shifting circuits or magnetic coupling. The capacitor coupled floating gate drive circuit is an improvement over prior art capacitor coupled floating gate drive circuits in that the new circuit uses a positive current feedback mechanism to reject slowly changing voltage variations that cause unintentional switch state changes in prior art capacitor coupled floating gate drive circuits.

An LED comprising a light-generating semiconductor region having an active layer sandwiched between two confining layers of opposite conductivity types. A cathode is arranged centrally on one of the opposite major surfaces of the semiconductor region from which is emitted the light. An array of discrete gold regions are formed via transition metal regions on the other major surface of the semiconductor region at which is exposed one of the confining layers which is of n-type AlGaInP semiconductor material. The gold is thermally diffused into the confining layer via the transition metal regions at a temperature less than the eutectic point of gold and gallium, thereby creating an array of ohmic contact regions of alloyed or intermingled gold and gallium, which are less absorptive of light than their conventional counterparts, to a thickness of 20 to 1000 angstroms. After removing the transition metal regions and gold regions from the surface of the light-generating semiconductor region, a reflective layer of aluminum is formed so as to cover both the ohmic contact regions and the exposed surface portions of the AlGaInP confining layer. An electroconductive base-plate of doped silicon is then bonded to the reflective layer.

A wafer level light-emitting diode (LED) array includes: a growth substrate; a plurality of LEDs arranged over the substrate, each including a first semiconductor layer, an activation layer, and a second semiconductor layer; a plurality of upper electrodes formed from a common material and electrically connected to the first semiconductor layers of the corresponding LEDs; and first and second pads arranged over the upper electrodes. The LEDs are connected in series by the upper electrodes, the first pad is electrically connected to an input LED from among the LEDs connected in series, and the second pad is electrically connected to an output LED from among the LEDs connected in series. Accordingly, a flip chip-type LED array can be provided which can be driven with a high voltage.

The invention discloses a highly-effective light-emitting diode with an improved current spreading layer structure and a production method thereof. Material which is extended on an N-GaAs under-layer comprises an n-GaAs buffer layer, or an AlAs/AlxGal-xAs or AlInP/(A1x Ga1-x)yIn1-yP Bragg reflection layer, an n-(AlxGa1-x)yIn1-yP lower limiting layer, an Undoped-(AlxGa1-x)yIn1-yP active region, a p-(A1xGa1-x)yIn1-yP upper limiting layer, and a p++AlxGal-xAs and p-GaP combined current spreading layer, wherein the p++AlxGal-xAs is arranged on the lower surface as a first current spreading layer, and the p-GaP is arranged on the upper surface as a second current spreading layer. The structure integrates the advantages of GaP and A1xGal-xAs materials, avoids the oxidization of materials, and guarantees the reliability and the stability of the current spreading and apparatuses.

An object of the present invention provides an n-type Group III nitride semiconductor stacked layer structure of a low resistance having excellent flatness generating few cracks and pits in the uppermost surface. The inventive n-type Group III nitride semiconductor stacked layer structure comprises a first n-type layer which includes a layer containing n-type impurity atoms at a high concentration and a layer containing n-type impurity atoms at a low concentration, a second n-type layer containing n-type impurity atoms at an average concentration smaller than that of the first n-type layer, the second n-type layer neighboring the layer containing n-type impurity atoms at a low concentration in the first n-type layer.

The present invention provides a semiconductor light-emitting device capable of keeping high luminance intensity even if electric power increases, and hence the device is suitable for lighting instruments such as lights and lamps. This semiconductor device comprises a metal electrode layer provided with openings, and is so large in size that the electrode layer has, for example, an area of 1 mm² or more. The openings have a mean diameter of 10 nm to 2 μm, and they penetrate through the metal electrode layer. That metal electrode layer can be produced by use of self-assembling of block copolymer or by nano-imprinting techniques.

A semiconductor device having a transistor and a rectifier includes: a current path; a first main electrode having a rectifying function and arranged on one end of the current path; a second main electrode arranged on the other end of the current path; an auxiliary electrode arranged in a region of the current path between the first main electrode and the second main electrode; a third main electrode arranged on the one end of the current path apart from the first main electrode along a direction intersecting the current path; and a control electrode arranged in a region of the current path between the second main electrode and the third main electrode. The transistor includes the current path, the second main electrode, the third main electrode, and the control electrode. The rectifier includes the current path, the first main electrode, the second main electrode, and the auxiliary electrode.

An exemplary embodiment of the present invention discloses a light emitting diode including a substrate having a first edge and a second edge opposite to each other, a light emitting structure disposed on the substrate, the light emitting structure including a first semiconductor layer and a second semiconductor layer, a plurality of first electrode pads arranged on an upper surface of the first semiconductor layer, the first electrode pads arranged in a vicinity of the first edge, a plurality of second electrode pads arranged on the second semiconductor layer, the second electrode pads arranged in a vicinity of the second edge, a plurality of first extensions, each first extension extending from a first electrode pad, and a plurality of second extensions, each second extension extending from a second electrode pad. The first extensions include intrusion parts extending in a direction from the first edge to the second edge, wherein the intrusion parts are spaced apart from each other and not connecting with the second electrode pads. Further, the second extensions include intrusion parts extending in a direction from the second edge to the first edge, wherein the first extension intrusion parts each extend into a region between two of the second extension intrusion parts.

The invention discloses a mains complementation controller for a solar street lamp. The controller comprises a solar cell panel, a charging module, a microprocessor, a constant-current output module, a switching power supply, a voltage detection module and a battery. The invention also discloses a control method of the controller. The controller is skillful and reasonable in structural design, when the electric quantity stored in the battery by the solar energy is insufficient, the controller is switched to a mains supply automatically in a seamless mode, the effect that the solar energy is used preferentially and the mains supply serves as a supplement can be effectively achieved, and charging and discharging can be controlled automatically according to different working parameters and states, so that the charging and the discharging are kept at the optimal states, the utilization efficiency of the solar energy is improved, the energy resources are effectively saved, the whole process is automatic, and the intelligent degree is high. The control method is simple in step, easy to implement, capable of supplying electricity by the battery and achieving seamless switching to the mains supply, effectively guaranteeing the sufficient utilization of solar energy resources, greatly prolonging the service life of the battery and reducing the maintenance cost and beneficial to popularization and application.