41results about How to "Lower turn-on resistance" patented technology

A HEMT-type field-effect semiconductor device has a main semiconductor region comprising two layers of dissimilar materials such that a two-dimensional electron gas layer is generated along the heterojunction between the two layers. A source and a drain electrode are placed in spaced positions on the main semiconductor region. Between these electrodes, with spacings therefrom, an insulator is provided with is made from a material capable of developing a stress to reduce carrier concentration in neighboring part of the two-dimensional electron gas layer, creating a discontinuity in this layer. A gate electrode overlies the insulator via a piezoelectric layer which is made from a material capable of developing, in response to a voltage applied to the gate electrode, a stress for canceling out the stress developed by the insulator. Thus the device is physically held off by the action of the insulator while no voltage is being impressed to the gate electrode and, upon voltage application thereto, piezoelectrically turns on by the action of the piezoelectric layer. The turn-on resistance of the device is relatively low as the insulator occupies only part of the source-drain spacing.

The invention discloses a semiconductor integrated circuit and a manufacturing method thereof. The semiconductor integrated circuit comprises a plurality of grooved metal oxide semiconductor field effect transistors and a plurality of grooved Schottky rectifiers which are positioned on a same substrate, wherein the plurality of grooved metal oxide semiconductor field effect transistors are provided with grooved source contact regions; and the plurality of grooved Schottky rectifiers are provided with grooved anode contact regions. By the semiconductor integrated circuit with the structure, grooved metal oxide semiconductor field effect transistors have lower starting resistance and Schottky rectifiers have lower pre-position voltage and low reverse leakage current.

A heterojunction bipolar transistor, having a structure in which a subcollector layer of a first conductive type having a higher doping concentration than a collector layer, a collector layer of the first conductive type, a base layer of the second conductive type, and an emitter layer of the first conductive type are deposited, in order, on a semi-insulating semiconductor substrate, and in which a hole barrier layer of semiconductor material with a band gap wider than that of the base layer is inserted between the base layer and the collector layer, so as to be in direct contact with the base layer.

A normally-off HEMT is made by first providing a substrate having its surface partly covered with an antigrowth mask. Gallium nitride is grown by epitaxy on the masked surface of the substrate to provide an electron transit layer comprised of two flat-surfaced sections and a V-notch-surfaced section therebetween. The flat-surfaced sections are formed on unmasked parts of the substrate surface whereas the V-notch-surfaced section, defining a V-sectioned notch, is created by lateral overgrowth onto the antigrowth mask. Aluminum gallium nitride is then deposited on the electron transit layer to provide an electron supply layer which is likewise comprised of two flat-surfaced sections and a V-notch-surfaced section therebetween. The flat-surfaced sections of the electron supply layer are sufficiently thick to normally generate two-dimensional electron gas layers due to heterojunctions thereof with the first and the second flat-surfaced section of the electron transit layer. The V-notch-surfaced section of the electron supply layer is not so thick, normally creating an interruption in the two-dimensional electron gas layer.

The invention discloses a trench metal oxide semiconductor field-effect transistor with ultrahigh cell density and a manufacturing method for the same. A source region and a body region are arranged in different areas of a device respectively so that the dimension of the device can be effectively decreased. Besides, trench metallic oxides of the trench metal oxide semiconductor field-effect transistor are in stripe cell structures, so that cell packing density is further increased, and starting resistance between a drain electrode and a source electrode is reduced.

The present invention relates to the field of a semiconductor device and provides a longitudinal short-opening grid channel-type HEMT device and a preparation method thereof. The HEMT device comprises a substrate, a buffer layer, a first GaN layer, a second GaN layer, a second barrier layer, a first barrier layer, a dielectric layer, a source electrode, a drain electrode and a grid electrode, wherein the buffer layer is positioned on the substrate; the first GaN layer is positioned on the buffer layer; one side, whic is deviated from the buffer layer, of the first GaN layer is provided with a groove; the second GaN layer and the second barrier layer are sequentially embedded into the groove; the first barrier layer is positioned on the first GaN layer except for the groove; the dielectric layer is positioned on the first barrier layer and the second barrier layer; the source electrode and the drain electrode are in contact with the first GaN layer and the lateral surfaces of the source electrode and the drain electrode are sequentially in contact with the first barrier layer and the dielectric layer from bottom to top; and the grid electrode is in contact with the dielectric layer. According to the present invention, a normally-closed type operation mode of the HEMT device can be obtained; when a large threshold value voltage is realized, on resistance of the device is effectively reduced; and the grid electrode structure also has the characteristics of small capacitor, high switching speed of the device and the like.

A power MOSFET cell includes an N+ silicon substrate having a drain electrode. A low dopant concentration N-type drift layer is grown over the substrate. Alternating N and P-type columns are formed over the drift layer with a higher dopant concentration. An N-type layer, having a higher dopant concentration than the drift region, is then formed and etched to have sidewalls. A P-well is formed in the N-type layer, and an N+ source region is formed in the P-well. A gate is formed over the P-well's lateral channel and next to the sidewalls as a vertical field plate. A source electrode contacts the P-well and source region. A positive gate voltage inverts the lateral channel and increases the conduction along the sidewalls. Current between the source and drain flows laterally and then vertically through the various N layers. On resistance is reduced and the breakdown voltage is increased.

The invention discloses a graphene buried heat radiation layer and vertical channel GaN MISFET cellular structure and a preparation method; the cellular structure comprises a substrate, an AIN isolation layer, a graphene buried heat radiation layer, an AIN nucleating layer, a GaN buffer layer, a n type heavy doping GaN layer, a n type GaN layer, a P type GaN electronic stop layer, a non-doping GaN layer and an AlGaN barrier layer arranged from bottom to top; a cellular structure grating groove hole extends from the cellular structure top to the n type GaN layer; the gating groove hole side wall and bottom are respectively provided with a gate medium layer. An existing normally off GaN MISFET device cannot simultaneously have even and stable large threshold-voltage, low device conductive resistance and high switching rate; aiming at the normally off type GaN base III-V family material power device, the normally off GaN MISFET cellular structure with the vertical grid structure and the preparation method are provided so as to solve said problems, thus realizing GaN MISFET device stable large threshold-voltage normally off operations, and effectively reducing the device starting conduction resistance.

This application provides a high power semiconductor device, which is characterized by forming two diodes connected in parallel and a schottky contact on a channel layer to lower the turn-on voltage and turn-on resistance of the high power semiconductor device at the same time and to enhance the breakdown voltage.

The invention provides a spin orbit torque magnetic random access memory unit, a memory array and a memory. The spin orbit torque magnetic random access memory unit comprises a magnetic tunnel junction and a gating device; the gating device is a two-dimensional material-based gating device; the magnetic tunnel junction is arranged above the gating device; the magnetic tunnel junction comprises anantiferromagnetic layer and a free layer, and the free layer is adjacent to the antiferromagnetic layer; when the gating device is turned on, the memory unit is turned on, current generates spin current to be injected into the free layer, and the magnetization direction of the free layer is turned over under the action of the exchange bias effect of the free layer and the antiferromagnetic layer.An exchange bias effect is utilized without an external field, deterministic magnetization overturning of the SOT-MRAM memory cell under a room-temperature zero magnetic field can be achieved by applying a magnetic tunnel junction optimization bias voltage, the purpose of data writing is achieved, and the SOT-MRAM memory unit of a double-end structure is achieved.

The invention relates to the technical field of semiconductor, in particular to a normally-closed GaN-based MOSFET structure with a high threshold voltage and high conduction performance and a fabrication method thereof. The fabrication method of the normally-closed GaN-based MOSFET structure with the high threshold voltage and high conduction performance comprises the following steps of firstly,providing a required substrate, sequentially and epitaxially growing a stress buffer layer, a GaN buffer layer, an AIN thin layer and an AlGaN thin layer on the substrate, and reserving the AlN thin layer and the AlGaN thin layer on a grid region by etching to obtain a substrate for epitaxy of a selection region; secondly, sequentially selecting a regional epitaxial GaN channel layer, a AIN insertion layer and a AIGaN barrier layer on the substrate to form a groove structure; and finally, depositing a grid dielectric layer, covering grid metal on a groove channel grid dielectric layer, and covering two ends of the grid with metal to form a source and a drain. By the fabrication method, the threshold voltage and the grid region mobility can be effectively improved, the channel resistance isreduced, and the conduction performance of the GaN MOSFET device is improved.

The invention discloses a radio frequency laterally diffused metal oxide semiconductor (LDMOS) device with thermometal silicide and a manufacturing method. A P-shaped silicon substrate is provided with P-shaped epitaxy. A N-shaped low doped drain region, a P trap and a N-shaped heavy doped drain region are arranged in the P-shaped epitaxy. A N-shaped heavy doped source region and a P-shaped heavy doped lead out region are arranged in the P trap. A drain electrode titanium silicide layer is arranged on the top of the N-shaped heavy doped source region. A source electrode titanium silicide layer is arranged on the top of the P-shaped heavy doped lead out region and the N-shaped heavy doped source region. A grid electrode titanium silicide layer is arranged on the top of a polycrystalline silicon grid electrode. Thickness of the grid electrode titanium silicide layer is larger than thickness of the drain electrode titanium silicide layer and the source electrode titanium silicide layer. Titanium silicide of a grid electrode is thicker, square resistance of the grid electrode is reduced, and normal thickness titanium silicide on a source electrode and a source electrode avoids electricity leakage to caused by junction penetration of source drain and the trap.

A switching circuit device provided between a first node and a second node within a power supply circuit, an inductor being coupled to the first or second node, the switching circuit device has: a first transistor that is provided between the first node and the second node and has a first gate width,a second transistor that is provided in parallel with the first transistor between the first node and the second node and has a second gate width larger than the first gate width,and a driving signal generation circuit, which, in response to a control signal generated according to an output voltage of the power supply circuit, outputs a first driving signal which drives the first transistor on and off, and a second driving signal which drives the second transistor on and off, with different timings between the first driving signal output and the second driving signal output.

The present invention provides a semiconductor device including a semiconductor substrate having a first conductive type, at least one high-side transistor device and at least one low-side transistor device. The high-side transistor device includes a doped high-side base region having a second conductive type, a doped high-side source region having the first conductive type and a doped drain region having the first conductive type. The doped high-side base region is disposed within the semiconductor substrate, and the doped high-side source region and the doped drain region are disposed within the doped high-side base region. The doped high-side source region is electrically connected to the semiconductor substrate, and the semiconductor substrate is regarded as a drain of the low-side transistor device.

The invention discloses a semiconductor integrated device comprising a plurality of trench metal oxide semiconductor field effect transistor units and a plurality of trench Schottky ballast units and a manufacturing method thereof. In the trench metal oxide semiconductor field effect transistor unit, the trench type contact area is adopted, which can reduce the turn-on resistance of the device while reducing the size of the device.

A current mode output driver and output current control method of controlling an output current using a gate voltage are provided. The current mode output driver, which outputs data read from a memory core to a transmission line, includes a gate voltage control circuit, a bias circuit, and a driver circuit. The gate voltage control circuit generates a predetermined gate voltage in response to a current control signal. The bias circuit outputs the gate voltage as a first enable signal in an active mode, and outputs a ground voltage as a second enable signal in a standby mode. The driver circuit drives a predetermined output current in response to the first enable signal, outputs the predetermined output voltage to the transmission line according to the data, and stops its operation in response to the second enable signal. The gate voltage control circuit changes the level of the gate voltage according to a value of the current control signal and output the changed result. Therefore, it is possible to easily increase resolution of an output current and reduce the occupied area of the current mode output driver, thereby facilitating a circuit design.

A lateral double diffused metal-oxide semiconductor device includes a substrate, a gate structure, a drain region, a plurality of isolation structures, at least one doped region, and a source region.The gate structure is on the substrate. The drain region and the source region are respectively located in the substrate on the first side and the second side of the gate structure. The isolation structure and the doped region are located in the substrate between the gate structure and the drain region, wherein the extension direction of the isolation structure is different from the extension direction of the gate structure. The doped region may be located between two isolation structures or below the isolation structures. The doped region and the drain region have opposite conductive states,so that the turn-on resistance of the lateral double-diffused metal-oxide semiconductor device is reduced, the electric field between the gate structure and the drain region is reduced, and the breakdown voltage of the lateral double-diffused metal oxide semiconductor device is improved.