30results about How to "Reduce electron concentration" patented technology

An insulating film is provided over one surface of a first semiconductor layer including a first oxide semiconductor including indium as a main component, and a second semiconductor layer including an i-type second oxide semiconductor is provided in contact with the other surface. The energy difference between a vacuum level and a Fermi level in the second oxide semiconductor is larger than that in the first oxide semiconductor. In the first semiconductor layer, a region in the vicinity of the junction surface with the second oxide semiconductor which satisfies the above condition is a region having an extremely low carrier concentration (a quasi-i-type region). By using the region as a channel, the off-state current can be reduced. Further, a drain current of the FET flows through the first oxide semiconductor having a high mobility; accordingly, a large amount of current can be extracted.

The invention provides an oxide semiconductor thin film transistor which comprises a substrate, a gate electrode, an insulation dielectric layer and an oxide semiconductor channel layer, wherein the gate electrode, the insulation dielectric layer and the oxide semiconductor channel layer are sequentially arranged on the substrate, the insulation dielectric layer enables the gate electrode and the oxide semiconductor channel layer to be insulted, a drain electrode and a source electrode are arranged on the upper surface of the oxide semiconductor channel layer, a gap between the drain electrode and the source electrode is d1, the length of an overlapping region of the source electrode and the gate electrode in the horizontal direction is d2, contact between the source electrode and the oxide semiconductor channel layer is schottky contact, and the contact between the drain electrode and the oxide semiconductor channel layer is ohmic contact. The short-channel effect on the oxide semiconductor thin film transistor is small due to new geometrical characteristics and operating principles, and the oxide semiconductor thin film transistor is favorable for improvement of consistency.

The invention discloses a device for relieving the influence on high-speed aircraft reentry communication by space plasma. The device is located in a plasma layer of a high-speed aircraft. The device for relieving the influence on high-speed aircraft reentry communication by the space plasma comprises a strong magnet and an electrode pair. The strong magnet is arranged in the inner surface of the high-speed aircraft located in the same axial direction with an electromagnetic wave receiving and sending antenna, the electrode pair is composed of an anode and a cathode, the anode and the cathode are located on the portions, at the two sides of the electromagnetic wave receiving and sending antenna, of a surface layer of the high-speed aircraft. The composite environment of an electric field and a magnetic field is created on a physical layer in space around the electromagnetic wave receiving and sending antenna of the high-speed aircraft, and an electromagnetic relieving layer is formed on the plasma layer of the high-speed aircraft. The problem of transmission interruption of communication signals in the process that the high-speed aircraft reenters the atmosphere is solved and the safety and real-time performance of space communication and the stability of signal transmission are guaranteed.

The invention relates to a friction nanometer power generator containing an electronic receiving layer, aims at improving the charge catching capability of the friction nanometer power generator and belongs to the field of new energy development and nanometer power generation. The power generator includes a positive-polarity friction part and a negative-polarity friction part which are in contact/are separated under the action of an external force; the positive-polarity friction part includes a first substrate and a first electrode which are arranged in sequence, and the first electrode can serve as a positive-polarity friction layer at the same time; the negative-polarity friction part includes a second substrate, a second electrode, an electric medium layer, the electronic receiving layer and a negative-polarity friction layer which are arranged in sequence; an alternating current signal is generated between the first electrode and the second electrode. The invention also relates toa preparation method of the friction nanometer power generator containing the electronic receiving layer.

The invention provides a laminated molybdenum disulfide field effect transistor, a preparation method and application thereof. In the laminated molybdenum disulfide field effect transistor, the surface of laminated molybdenum disulfide is covered with an F4-TCNQ molecular layer. The molybdenum disulfide is covered with small organic molecules F4-TCNQ, the molybdenum disulfide is automatically injected into the F4-TCNQ through sulfur vacancy self-doped electrons, the electron concentration in the molybdenum disulfide is reduced, and the purpose of reducing the threshold voltage of the molybdenum disulfide field effect transistor is reached. The function of an NH3 sensor under low gate voltage can be realized by using the molybdenum disulfide field effect transistor provided by the invention.

A device includes a substrate; a buffer layer on the substrate; a barrier layer on the buffer layer, a source electrically coupled to the barrier layer; a gate electrically coupled to the barrier layer; and a drain electrically coupled to the barrier layer. The device further includes an electron concentration reduction structure arranged with at least one of the following: in the barrier layer and on the barrier layer. The electron concentration reduction structure is configured to at least one of the following: reduce electron concentration around the gate, reduce electron concentration around an edge of the gate, reduce electron concentration, increase power gain, increase efficiency, decouple the gate from the drain, decouple the gate from the source, and reduce capacitance.

According to the composite gas-sensitive material and the preparation method thereof, and the ethanol gas sensor and the preparation method thereof disclosed by the invention, a trititanium carbide material and a cobaltosic oxide material derived from a metal organic framework are combined and applied to the gas sensor; the interdigital electrode is coated with a cobaltosic oxide-trititanium carbide composite material coating film derived from a metal organic framework, so that the gas-sensitive response of traditional cobaltosic oxide to ethanol is greatly enhanced, the selectivity to ethanol is improved, the sensitivity is high, and the highest sensitivity to 50 ppm ethanol can reach 185. Compared with a traditional cobalt oxide gas sensor, the sensitivity of the cobalt oxide gas sensor is improved by 15 times, even if the gas concentration is 1 ppm, detection can be conducted, the response speed is high, and good repeatability and stability are achieved.

The invention discloses a semiconductor structure and a formation method thereof. The formation method of the semiconductor structure comprises the following steps: forming semiconductor layers at sidewalls and top surfaces which are exposed out of fin portions, wherein the semiconductor layers are doped with P-type ions; doping threshold-voltage adjustment ions in the fin portions; and doping the P-type ions in the semiconductor layers, and performing an annealing process after the threshold-voltage adjustment ions are doped in the fin portions. When a P-type fin field effect transistor is formed through the formed semiconductor structure, the negative bias temperature instability of the P-type fin field effect transistor is inhibited, and the performance is improved.

The invention belongs to the technical field of a high-power semiconductor device, and relates to a silicon carbide bipolar junction transistor. The silicon carbide bipolar junction transistor comprises a collector electrode, an N+ substrate, an N- collector region and a P-type base region, which are stacked up in sequence from the bottom up. One end of the upper surface of the P-type base region is provided with a base electrode, and the other end thereof is provided with an N+ emitter region; the upper surface of the N+ emitter region has an emitter electrode; the upper surface of the P-type base region between the base electrode and the N+ emitter region is provided with an AlN layer; the AlN layer is isolated with the base electrode and the N+ emitter region through heavily-doped layers respectively; and one heavily-doped layer extends to the side away from the base electrode along the upper surface of the N+ emitter region, and is connected with the emitter electrode. The beneficial effects are that, compared with traditional technology, the silicon carbide bipolar junction transistor greatly reduces process complexity, improves qualify rate and reliability of the device and meanwhile, improves current gain of the SiC BJT device.

The invention discloses a garnet type solid electrolyte capable of effectively inhibiting lithium dendrites and a preparation method thereof, and the preparation method comprises the following steps: carrying out ball milling on a lithium source, a lanthanum source, a zirconium source and a tantalum source according to a chemical formula Li7La3Zr1. 5Ta0. 5O12-xM to obtain raw powder; 2.5% < = x < = 25%; pre-sintering the raw powder to obtain primarily-sintered powder; adding a low-electron conductive substance M into the primarily sintered powder, and uniformly grinding to obtain mother powder; pressing the mother powder into a plain blank sheet; and sintering the blank sheet to obtain the garnet type solid electrolyte capable of effectively inhibiting the lithium dendrites. The preparation method adopts a traditional simple solid-phase sintering preparation process, is completed through a two-step sintering method, has the advantages of being simple in process, easy to operate, high in repeatability, low in production cost and the like, and is suitable for practical application and large-scale production.

The invention discloses a semiconductor stack for hall effect device. The semiconductor stack (100) for a Hall effect device comprises: a bottom barrier (140) comprising AlxGa1-xAs, a channel (130) comprising InyGa1-yAs, on the bottom barrier (140), a channel barrier (120) with a thickness which is at least 2 nm and which is smaller than or equal to 15 nm, and which at least comprises a first layer (121) comprising AlzGa1-zAs with 0.1 <= z <= 0.22, wherein the first layer (121) has a thickness of at least 2 nm, wherein a conduction band edge of the bottom barrier (140) and the first layer (121) is higher than a conduction band edge of the channel (130), a doping layer (112) comprising a composition of Al, Ga and As and doped with n-type material, and a top barrier (111) comprising a composition of Al, Ga and As.

The invention relates to a medical metal material with a modified film with photo-thermal characteristics on the surface and a preparation method and application of the medical metal material. And the modified film is a nickel-titanium oxide TimNinO2m + n embedded with nano nickel. The nano nickel is a simple substance and is spherical, and the radius of the nano nickel is 2-20 nm; and the density of the nickel nanoparticles is 5-30 per square micron. The nickel-titanium oxide is of a sheet structure, the length and the width of a sheet layer are 0.5-2 microns, and the thickness of the sheet layer is 10-40 nm. In the preparation method, the nickel-titanium layered double hydroxide is firstly generated, and then the nickel-titanium oxide thin film inlaid with the elemental nickel is obtained through heating reduction. The cost of the constructed nano nickel is obviously reduced, and meanwhile the problems that non-noble metal nano metal particles are prone to being oxidized, and the photo-thermal effect cannot be kept for a long time are effectively solved; and the material also has good osteogenesis performance, improves the biological activity of medical metal, and is suitable for surface modification of hard tissue implantation instruments.

The invention relates to the technical field of semiconductors, in particular to a self-powered MSM type ZnO-based ultraviolet photoelectric detector and a preparation method thereof, and the detector comprises a substrate, an n-type buffer layer, a p-type active layer, an n-type active layer and two electrodes; the n-type buffer layer is deposited on the substrate; the p-type active layer only covers part of the n-type buffer layer to form a step from the n-type buffer layer to the p-type active layer; the n-type active layer serves as a continuous top layer, one part of the n-type active layer covers the p-type active layer, and the other part of the n-type active layer covers the n-type buffer layer, so that the two parts of the n-type active layer generate unequal electron concentrations, and a space charge region for separating photon-generated carriers is generated at the step; the two electrodes are distributed on the two sides of the step respectively, and a space charge region formed by a Schottky contact barrier between the two electrodes further separates photo-induced electron-hole pairs. Compared with the prior art, the device has the advantages of simple structure, back incidence band-pass response, high light responsivity, high response speed and no need of external bias voltage.

The invention provides a Trench IGBT and a method for manufacturing the Trench IGBT. A Schottky contact structure is adopted in the Trench IGBT, and the conductivity voltage drop of the Trench IGBT is reduced. The Trench IGBT comprises a gate oxide layer, a Pbody voltage withstanding area, and an N-type low-adulteration substrate base area, a metallization cathode and a Schottky contact layer which is located between the gate oxide layer and the Pbody voltage withstanding area and is in contact with the N-type low-adulteration substrate base area and the metallization cathode. The method for manufacturing the Trench IGBT comprises the steps that after the Pbody voltage withstanding area and the gate oxide layer are formed on the N-type low-adulteration substrate base area, the Schottky contact layer is formed on the N-type low-adulteration substrate base area between the gate oxide layer and the Pbody voltage withstanding area; the metallization cathode is formed on the Schottky contact layer.

The invention discloses a charge plasma SiGe heterojunction bipolar transistor, which is an npn type transistor. A base region is prepared by adopting a SiGe material, a heterojunction is formed by the base region, an undoped Si emitter region and a Si collector region, and the current gain of the device is improved by effectively changing an energy band structure at an emitter junction. Meanwhile, due to the fact that the work function of cadmium metal is 4.07 eV, the cadmium metal can easily form good gold-semi-contact with undoped Si, n-type charge plasma is effectively induced to be generated, and the transistor has the advantages of being excellent in conductivity, welding resistance, tensile strength and abrasion resistance and the like; therefore, cadmium metal is used as an electrode material of the emitter and the collector and is used for adjusting the concentration of n-type carriers in the corresponding emitter region and the collector region below the emitter and the collector. Through effective cooperation of the above structure, synchronous improvement of transistor current gain, breakdown voltage and characteristic frequency is realized.

The invention discloses a gallium oxide-based sunlight blind area detector based on zero gate bias. The gallium oxide-based sunlight blind area detector comprises: a substrate; a gallium oxide nano film located in the middle section of the upper surface of the substrate and subjected to oxygen annealing treatment in the preparation process of the sunlight blind area detector; a source electrode and a drain electrode which are located on the two sides of the gallium oxide nanometer film on the upper surface of the substrate respectively and are in lap joint with the gallium oxide nanometer film; a passivation layer which covers the upper surface of the gallium oxide nano film, wherein a gate groove which extends into the gallium oxide nano film is etched downwards from the middle part of the upper surface of the passivation layer; a gate dielectric which covers the surface of the gate groove and the upper surface of the passivation layer; and a gate electrode which is covered in the gate groove and above the gate dielectrics on the two sides, wherein the thickness of gate metal forming the gate electrode is 14 +/-4 nm to make light waves in a sunlight blind area penetrate through the gate electrode, and the design value of bias voltage of the gate electrode is 0 V. The sunlight blind area detector provided by the invention is low in power consumption.