92results about How to "Reduce carrier concentration" patented technology

An object is to control composition and a defect of an oxide semiconductor. Another object is to increase field effect mobility of a thin film transistor and to obtain a sufficient on-off ratio with off current suppressed. The oxide semiconductor is represented by InMO₃(ZnO)_n (M is one or a plurality of elements selected from Ga, Fe, Ni, Mn, Co, and Al, and n is a non-integer number of greater than or equal to 1 and less than 50) and further contains hydrogen. In this case, the concentration of Zn is made to be lower than the concentrations of In and M (M is one or a plurality of elements selected from Ga, Fe, Ni, Mn, Co, and Al). In addition, the oxide semiconductor has an amorphous structure. Here, n is preferably a non-integer number of greater than or equal to 50, more preferably less than 10.

A GaN-based semiconductor light-emitting device includes (A) a first GaN-based compound semiconductor layer 13 having n-type conductivity, (B) an active layer 15 having a multi-quantum well structure including well layers and barrier layers for separating between the well layers, and (C) a second GaN-based compound semiconductor layer 17 having p-type conductivity. The well layers are disposed in the active layer 15 so as to satisfy the relation d₁<d₂ wherein d₁ is the well layer density on the first GaN-based compound semiconductor layer side in the active layer and d₂ is the well layer density on the second GaN-based compound semiconductor layer side.

A compound semiconductor device has a buffer layer formed on a conductive SiC substrate, an AlxGa1-xN layer formed on the buffer layer in which an impurity for reducing carrier concentration from an unintentionally doped donor impurity is added and in which the Al composition x is 0<x<1, a GaN-based carrier transit layer formed on the AlxGa1-xN layer, a carrier supply layer formed on the carrier transit layer, a source electrode and a drain electrode formed on the carrier supply layer, and a gate electrode formed on the carrier supply layer between the source electrode and the drain electrode. Therefore, a GaN-HEMT that is superior in device characteristics can be realized in the case of using a relatively less expensive conductive SiC substrate compared with a semi-insulating SiC substrate.

A thin film transistor according to an exemplary embodiment of the present invention includes an oxide semiconductor. A source electrode and a drain electrode face each other. The source electrode and the drain electrode are positioned at two opposite sides, respectively, of the oxide semiconductor. A low conductive region is positioned between the source electrode or the drain electrode and the oxide semiconductor. An insulating layer is positioned on the oxide semiconductor and the low conductive region. A gate electrode is positioned on the insulating layer. The insulating layer covers the oxide semiconductor and the low conductive region. A carrier concentration of the low conductive region is lower than a carrier concentration of the source electrode or the drain electrode.

A semiconductor device includes an oxide semiconductor layer including a channel formation region which includes an oxide semiconductor having a wide band gap and a carrier concentration which is as low as possible, and a source electrode and a drain electrode which include an oxide conductor containing hydrogen and oxygen vacancy, and a barrier layer which prevents diffusion of hydrogen and oxygen between an oxide conductive layer and the oxide semiconductor layer. The oxide conductive layer and the oxide semiconductor layer are electrically connected to each other through the barrier layer.

The invention relates to a method for producing a coated item (2) by depositing at least one transparent conductive metal oxide layer (3) on a substrate (5), comprising the deposition (I) and preferably a subsequent temperature treatment (II) of the coating (3). After the optional temperature treatment (II), the surface texture (8) of the coating (3) is statistically adjusted by means of an etching method.

A sensor for detecting intensity of radiation such as of infrared radiation includes an ROIC substrate (9) and a resistance element (1) arranged at a distance of the surface of the ROIC substrate. The resistance element comprises one more semiconducting layers such as a silicon semiconducting layer and a semiconducting layer of a silicon-germanium alloy forming a heterojunction. The semiconducting layer or layers can be doped with one or more impurity dopants, the doping level or levels selected so that the layer retains the basic crystallographic properties of the respective material such as those of monosilicon or a monocrystalline silicon-germanium alloy. The impurity dopants are selected from the elements in groups IE, IV, and V, in particular among boron, aluminium, indium, arsenic, phosphorous, antimony, germanium, carbon and tin. The doping can be abrupt so that there is an interior layer inside said semiconducting layer or layers having a significantly higher doping level.

Disclosed is an oxide semiconductor having an amorphous structure, wherein higher mobility and reduced carrier concentration are achieved. Also disclosed are a thin film transistor, a method for producing the oxide semiconductor, and a method for producing the thin film transistor. Specifically disclosed is an oxide semiconductor which is characterized by being composed of an amorphous oxide represented by the following a general formula: In_x+1MZn_y+1Sn_zO_{(4+1.5x+y+2z)} (wherein M is Ga or Al, 0≦x≦1, −0.2≦y≦1.2, z≧0.4 and 0.5≦(x+y)/z≦3). This oxide semiconductor is preferably subjected to a heat treatment in an oxidizing gas atmosphere after film formation. Also specifically disclosed is a thin film transistor which is characterized by comprising the oxide semiconductor.

The invention discloses a silicon carbide consubstantial PIN (Personal Identification Number) microstructure material which comprises an N type silicon carbide substrate, an N-variable concentration buffer layer arranged on the N type silicon carbide substrate, an intrinsic layer arranged on the N-variable concentration buffer layer, and a P+ cap layer arranged on the intrinsic layer. The invention simultaneously discloses a preparation method of the silicon carbide consubstantial PIN microstructure material. The invention can prepare an extension SiC epitaxial material with the advantages ofbright surface and uniform resistivity, the background carrier concentration of the intrinsic epitaxial layer can be reduced to the 1015 order of magnitude, and the microstructure material provided by the invention is suitable for high-power electronic and electric devices of semiconductors.

The invention relates to a copper-selenium-based nano-composite thermoelectric material and a preparation method thereof. The p-type nano-composite thermoelectric material comprises Cu2 xSe1 y zSyTezand carbon nano-tubes distributed in the Cu2 xSe1 y zSyTez, 0<=x<=0.15, 0<=y<=1, 0<=z<=1, y+z<=1, and mass percentage of the carbon nanotubes <=2%. The raw materials used in the preparation method areabundant in source and low in cost; production process and production equipment are simple; and controllability and repeatability are good.

To provide a semiconductor diode with a part of a semiconductor lamination portion having a mesa structure portion, which is the part where a pn-junction is formed by lamination of an n-type semiconductor layer and a p-type semiconductor layer on a substrate, comprising: a protective insulating film formed by coating a main surface of the mesa structure portion, a side face of the mesa structure portion in which an interface of the pn-junction is exposed, and an etched and exposed surface of the n-type semiconductor layer; and an anode electrode formed in ohmic-contact with the p-type semiconductor layer exposed from an opening formed on a part of the main surface of the mesa structure portion of the protective insulating film, extending from the main surface, through the side face of the mesa structure portion, to the surface of the n-type semiconductor layer.

The invention discloses an MSM type alpha-Ga2O3-based solar blind ultraviolet light detector and a preparation method thereof. The detector sequentially comprises an a-surface sapphire substrate, an active layer and a pair of parallel metal electrodes from bottom to top, wherein the active layer is a (110) oriented alpha-Ga2O3 film. According to the invention, the alpha-Ga2O3 and the sapphire havethe same crystal form and low lattice mismatch rate, the (110) oriented alpha-Ga2O3 film with better crystallization quality grows on the a-surface sapphire, and the film has high electron mobility,so that the gain of the device is large, and the light-dark current ratio of the device is large, and the responsivity is high. Besides, the solar blind ultraviolet light detector with the MSM structure prepared by the invention is simple in structure and manufacturing process, and the detector prepared by the invention has good detection capability on deep ultraviolet light with the wavelength of245nm, and is small in dark current, large in light-dark current ratio, high in responsivity and stable in performance.

The invention discloses an active layer manufacturing method, an oxide thin film transistor and a manufacturing method thereof. The active layer manufacturing method comprises the following steps that an oxide thin film is deposited on a substrate and the oxide thin film is patterned so as to obtain an oxide layer; a photoresist layer covering the oxide layer is manufactured on the substrate, and the photoresist layer is patterned so that the oxide layer is enabled to be exposed out of a channel region; the substrate is arranged in electrolyte, the substrate acts as an anode, metal Pt acts as a cathode, anodic oxidation is performed on the substrate, and anodic oxidation is performed on the oxide layer on the channel region and then an active layer is formed; and the substrate is taken out and the photoresist layer is removed. The carrier concentration of the active layer is reduced by the anodic oxidation method so that positive shifting of device threshold voltage can be realized, the device is enabled to be in the "normally-off" state and thus the device of high stability and low power consumption can be obtained.

The invention discloses a method for preparing a nitrogen oxygen zinc thin film. Radio frequency magnetron sputtering is used, a zinc nitride target which is 99.9-99.999% in volume percentage is taken as sputtering target materials, and the distance between the target materials and a substrate is 20-150mm; under certain radio frequency, argon which is 99.9-99.999% in volume percentage is taken as sputtering gas, sputtering is carried out at the substrate temperature of 25-150DEG C and at power density of 0.5-5W/cm2, and the background vacuum of a sputtering room is smaller than 1*10-7torr; pre-sputtering is carried out for a period of time through the argon, and then oxygen which is 99.9-99.999% in volume percentage is taken as reaction gas to obtain the nitrogen zinc oxide thin film with oxygen flow of 0.1-60sccm and argon flow of 5-100sccm and at sputtering pressure of 0.1-10.0Pa, wherein the atomic number of Zn accounts for 51-66%, and N:O=1:3-2:1. The method for preparing the nitrogen zinc oxide thin film solves the problem that the nitrogen is low in solid solubility in zinc oxide, and the prepared n-type nitrogen zinc oxide thin film is high in carrier mobility and low in specific resistance.

The invention relates to copper-selenium based high performance thermoelectric material and a preparation method of the same. The composition chemical formula of the copper-selenium based high performance thermoelectric material is Cu2Se1-xSX, wherein 0<x<=0.16. The copper-selenium based high performance thermoelectric material can restrain precipitation of copper to some extent so as to reduce the carrier concentration of a system.

The invention discloses a high-gain solar blind ultraviolet light detector based on a (GaY)2O3 amorphous film and a preparation method of the high-gain solar blind ultraviolet light detector. The detector sequentially comprises a c-plane sapphire, an active layer and a pair of parallel electrodes from bottom to top, wherein the active layer is the amorphous (GaY)2O3 film. According to the invention, Y3+ ions are used for partially replacing Ga3+ ions in Ga2O3, so that the band gap of Ga2O3 is increased, and the thin film is converted into amorphous from single crystal. The amorphous (GaY)2O3 film with a higher band gap can effectively reduce the dark current of the device, and enables the cut-off wavelength to be blue-shifted to be within 280nm. Meanwhile, the amorphous (GaY)2O3 film has higher defect concentration, and the defects not only can improve the gain, but also can be used as a recombination center to promote carrier recombination, so that compared with a pure Ga2O3 device, an amorphous (GaY)2O3 device has the advantages that the responsivity is obviously improved, the relaxation time is obviously shortened, and the detection capability on deep ultraviolet light is greatly improved.

The invention discloses an array substrate manufacturing method, an array substrate and a display device, belonging to the technical field of display. The manufacturing method comprises steps: forming an oxide active layer on an underlayment substrate, wherein the underlayment substrate comprises a display region and a non-display region; forming a photoresist layer on the oxide active layer; forming an active layer pattern; removing the photoresist layer of the display region; performing plasma surface treatment for the oxide active layer of the display region to increase oxygen content of the oxide active layer of the display region. According to the invention, reliability of thin film transistors of the display region and the non-display region can be guaranteed at the same time.