955results about How to "Increase the doping concentration" patented technology

A first doped layer of a conductivity type opposite to that of source / drain regions is formed in a semiconductor substrate under a gate electrode. A second doped layer of the conductivity type opposite to that of the source / drain regions is formed in the semiconductor substrate below the first doped layer. The first doped layer has a first peak in dopant concentration distribution in the depth direction. The first peak is located at a position shallower than the junction depth of the source / drain regions. The second doped layer has a second peak in dopant concentration distribution in the depth direction. The second peak is located at a position deeper than the first peak and shallower than the junction depth of the source / drain regions. The dopant concentration at the first peak is higher than that at the second peak.

A spintronic device may include at least one superlattice and at least one electrical contact coupled thereto, with the at least one superlattice including a plurality of groups of layers. Each group of layers may include a plurality of stacked base semiconductor monolayers defining a base semiconductor portion having a crystal lattice, at least one non-semiconductor monolayer constrained within the crystal lattice of adjacent base semiconductor portions, and a spintronic dopant. The spintronic dopant may be constrained within the crystal lattice of the base semiconductor portion by the at least one non-semiconductor monolayer. In some embodiments, the repeating structure of a superlattice may not be needed.

It was an objective of the present invention to provide a susceptor which can prevent a increasing phenomenon of the dopant concentration of the epitaxial layer at the peripheral portion of the wafer. By providing a through-hole 7 passing through to a rear side at the outer peripheral side of the wafer inside the wafer pocket 6, a down flow of a reacting source gas from the upper surface of the susceptor 5 is formed, so that the unwanted flow of the dopant species being exhausted at the rear surface onto the wafer surface can be avoided. As a result, a raise in the dopant concentration at the outer peripheral portion of the epitaxial layer 9 can be controlled.

A trench MOSFET with split gates and diffused drift region for on-resistance reduction is disclosed. Each of the split gates is symmetrically disposed in the middle of the source electrode and adjacent trench sidewall of a deep trench. The inventive structure can save a mask for definition of the location of the split gate electrodes. Furthermore, the fabrication method can be implemented more reliably with lower cost.

A semiconductor power device having shielded gate structure integrated with a trenched clamp diode formed in a semiconductor silicon layer, wherein the shielded gate structure comprises a shielded electrode formed by a first poly-silicon layer and a gate electrode formed by a second poly-silicon layer. The trenched clamp diode is formed by the first poly-silicon layer. A shielded gate mask used to define the shielded gate is also used to define the trenched clamp diode. Therefore, one poly-silicon layer and a mask for the trenched clamp diode are saved.

A semiconductor device comprises: a first semiconductor layer of silicon carbide of a first conductivity type; a second semiconductor layer of silicon carbide of a second conductivity type selectively provided on the first semiconductor layer; a main electrode layer of silicon carbide of the first conductivity type selectively provided on the second semiconductor layer; a gate insulating film provided on the second semiconductor layer; a gate electrode formed on the gate insulating film; and a third semiconductor layer of the first conductivity type intervening a current path which is formed between the main electrode layer and the first semiconductor layer when an ON voltage is applied to the gate electrode. The third semiconductor layer is selectively provided on the first semiconductor layer and is adjacent to the second semiconductor layer. A doping density of the third semiconductor layer is higher than a doping density of the first semiconductor layer.

A tunneling injection based Schottky source / drain memory cell comprising: a first semiconductor layer with a first conductivity type overlying an insulating layer, wherein the first semiconductor acts as a body region; a gate dielectric overlying the semiconductor layer; a gate electrode overlying the gate dielectric; a pair of spacers on sides of the gate electrodes; and a first Schottky barrier junction formed on a source region and a second Schottky barrier junction formed on a drain region on opposing sides of the body region. The source and the regions have an overlapping portion with the gate electrode and length of overlapping portion is preferably greater than about 5 Å. Interfacial layers are formed between the first and the second Schottky barrier regions.

This invention discloses a trench MOSFET comprising a top side drain region in a wide trench in a termination area besides a BV sustaining area, wherein said top side drain comprises a top drain metal connected to an epitaxial layer and a substrate through a plurality of trenched drain contacts, wherein the wide trench is formed simultaneously when a plurality of gate trenches are formed in an active area, and the trenched drain contacts are formed simultaneously when a trenched source-body contact is formed in the active area.

The present invention discloses an optical fiber preform cladding fluorine doping method, which comprises the following steps: depositing a core layer loose body on a target rod; heating the outer surface of the core layer loose body to form a dense layer, such that density of the dense layer is higher than density in the core layer loose body; depositing an inner cladding loose body outside the dense layer to form a core rod loose body comprising the core layer loose body and the inner cladding loose body; taking the target rod out to form a center hole in the center of the core rod loose body; placing the core rod loose body into a glass transition furnace, carrying out heating dewatering in a dewatering atmosphere, and introducing dewatering gas into the center hole during heating; heating the core rod loose body in a fluoride atmosphere, such that fluorine is selectively doped into the inner cladding loose body to form step refraction index distribution; and carrying out glass transition on the core rod loose body, such that the center hole is shrunk, the core layer loose body forms a core layer, and the inner cladding loose body forms an inner cladding so as to form a core rod. With the method, OH<-> content in the core layer can be effectively reduced, attenuation of optical fiber 1383 nm can be reduced, and fluorine distribution in a radial direction of the cladding is uniform.

The present invention discloses a transversal bilateral diffusion MOS transistor with high pressure resistant, which belongs to micro-electronics semi-conductor device field. The device includes a gate region, a source area, a drain region, a tagma, a gate medium and a drift region, the setting drift region is placed between the tagma and the drain region, and the doping type is opposite to the tagma, an insulating medium region and a doping region which is opposite to the doping type of the drift region are equipped in the drift region, and the doping concentration of the doping region is higher than that of the drift region, the doping region is adjacent to the tagma, however the insulating medium region is adjacent to the drain region. Because the insulating medium region and the doping region are inducted into the drift region at the same time, the effective depth of the drift region is reduced effectively to make the electric field more uniform and increase the equivalent length of the drift region, the resistant high Voltage characteristic of the transversal bilateral diffusion MOS transistor device of the present invention is good.

A trench Schottky barrier rectifier includes an cathode electrode at a face of a semiconductor substrate and an multiple epitaxial structure in drift region which in combination provide high blocking voltage capability with low reverse-biased leakage current and low forward voltage. The multiple structure of the drift region contains a concentration of first conductivity dopants therein which comprises two or three different uniform value from a Schottky rectifying junction formed between the anode electrode and the drift region. The thickness of the insulating region (e.g., SiO2) in the MOS-filled trenches is greater than 1000 Å to simultaneously inhibit field crowing and increase the breakdown voltage of the device. The multiple epi structure is preferably formed by epitaxial growth from the cathode region and doped in-situ.

A structure that includes a rectifier is formed as follows. A trench is formed in a semiconductor region of a first conductivity type. A dielectric layer is formed along opposing sidewalls of the trench but is discontinuous along the bottom of the trench. A doped liner is formed over the dielectric layer and along the bottom of the trench. The doped liner includes dopants of a second conductivity type and is in direct contact with the semiconductor region along the bottom of the trench. A portion of the dopants are diffused from the doped liner into the semiconductor region along the bottom of the trench to form a doped region. The doped region forms a PN junction with the surrounding semiconductor region.

The invention discloses a polarization beam-combination device for a pulsed laser. The polarization beam-combination device comprises the pulsed laser, an input beam splitter, n laser amplifiers and n-1 polarization coherent beam-combination units. The pulsed laser outputs a beam of seed light. The input beam splitter divides the seed light into n sub-seed light beams. The n laser amplifiers respectively carry out power amplification to the n sub-seed light beams. The n-1 polarization coherent beam-combination units carry out pairwise polarization in-phase beam-combination for n-1 times to n laser beams output by the n laser amplifiers. N is a natural number which is bigger than or equal to two. An output end of the polarization beam-combination device is connected with an output beam splitter. A hard light output end of the output beam splitter is used as an output end of the polarization coherent beam-combination units. Light output from a low light output end of the output beam splitter shoots into a relative phase detection module of a drive phase control module, and the relative phase detection module enables phase positions of two laser beams to be consistent. Through adoption of a polarization detection method, the polarization beam-combination device detects the relative phase positions of the two laser beams, and is capable of achieving coaxial combination of a plurality of coherent light beams, high in combined efficiency and good in beam quality.

A transparent glass ceramics of RE-doped oxyfluoride is proportionally prepared from SiO2, Al2O3, EnF2, MF2 and ReF3, where M is 2-valence alkali-earth metal ion chosen from Mg, Ca, Sr, and Ba and Re is 3-valence RE ion chosen from La, Ce, Pr, Nd, Pm, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb and Lu, through high fusing and heat treating. It can be extensive used in laser, luminous and optical communication field.

A method of manufacturing a memory device addressing reliability and refresh characteristics through the use of a multilayered doped conductor, and a method making is described. The multilayered doped conductor creates a high dopant concentration in the active area close to the channel region. The rich dopant layer created by the multilayered doped conductor is less susceptible to depletion from trapped charges in the oxide. This improves device reliability at burn-in and lowers junction leakage, thereby providing a longer period between refresh cycles.

A process for preparing the prefabricated RE-doped optical-fibre rod features that the chemical gas-phase deposition of plasma is used to deposit the doped SiO2 layer on the inner surface of liner quartz tube and the evaporator is used to directly deliver the RE compound and other codoping agent into reaction tube for direct deposition without pollution.

A light-emitting device, such as a light-emitting diode (LED), has a group III-nitride current spreading layer which is either doped with transition metal, or comprises alternating transition metal nitride layer and group III-nitride layer. Also provided is a light-emitting device, such as a light-emitting diode (LED), having a quantum well doped with transition metal. Also provided is a method of forming transition-metal containing AlInGaN electrical conductive material.

The invention discloses a luminescent centre regionally doped rare earth upconversion luminescent material and a preparation method thereof, which relates to the technical field of structural design and preparation of luminescent materials. For solving the problems of small doping amount in the luminescent center and low luminescent efficiency of the rare earth upconversion luminescent material, the conventional materials of the same kind take NaYF4 as a matrix, are doped with rare earth sensitized ions and rare earth luminescent ions and has a core / shell structure and nanocrystalline micro structure, wherein a luminescent shell layer is coated outside the core / shell structure, and a sensitized layer is the outmost layer. The preparation method of the rare earth upconversion luminescent material comprises: after a trifluoroacetate thermal decomposition method is implemented, adding a luminescent shell layer precursor into solution of nanoparticle colloid with the luminescent core / shell structure, heating, and reacting to form the luminescent shell layer; cooling the product obtained by the previous step, adding a sensitized shell precursor layer, heating, reacting and obtaining a sensitized shell layer on the outside of the luminescent shell layer; and thus, obtaining the luminescent centre regionally doped rare earth upconversion luminescent material.

The invention discloses a method for manufacturing an insulated gate bipolar transistor (IGBT) device. The method sequentially comprises an ion injection step of forming a p type heavily doped collecting region on the back side of a silicon wafer, a partial or whole annealing step and a step of depositing surface metal on the front side of the silicon wafer; and after the p type heavily doped collecting region is formed on the back side of the silicon wafer, a layer of silicon dioxide is deposited on the back side of the p type heavily doped collecting region. The method has the advantages that the temperature limitation of the p type ion annealing on the back side of the silicon wafer is eliminated, and high activity rate is easy to obtain. Simultaneously, the p type impurity distribution in the p type heavily doped collecting region can be optimized. On one hand, the ohmic contact with back metal is easy to form, on the other hand, the emission efficiency of a precision navigation processor (PNP) is favorably controlled, and the alternating current characteristic of the IGBT device is improved.

An RE doped optical fibre with dual glass clad layers, that is, coaxial internal and external clad layers. The fibre core is made of phosphate glass system. The internal clad layer is made of phosphate (or silicate) glass system. Its preparing process includes choosing the raw glass materials for fibre core and internal clad layer, melting, preparing prefabricated rod, and drawing. Its advantages are high concentration of doped RE ions, and gain, big excited emitting area, wide tunning range and low cost.

The present invention facilitates semiconductor device fabrication by providing mechanisms for utilizing different isolation schemes within embedded memory and other logic portions of a device. The isolation mechanism of the embedded memory portion is improved relative to other portions of the device by increasing dopant concentrations or reducing the depth of the dopant profiles within well regions of the embedded memory array. As a result, smaller isolation spacing can be employed thereby permitting a more compact array. The isolation mechanism of the logic portion is relatively less than that of the embedded memory portion, which permits greater operational speed for the logic.

Embodiments of the present disclosure generally relate to doping and annealing substrates. The substrates may be doped during a hot implantation process, and subsequently annealed using a nanosecond annealing process. The combination of hot implantation and nanosecond annealing reduces lattice damage of the substrates and facilitates a higher dopant concentration near the surface of the substrate to facilitate increased electrical contact with the substrate. An optional capping layer may be placed over the substrate to reduce outgassing of dopants or to control dopant implant depth.

The present invention provides a crystalline silicon solar cell and a preparation method thereof. The crystalline silicon solar cell comprises: an N-type silicon substrate; a tunneling oxide layer formed on the back surface of the N-type silicon substrate; and a polysilicon layer formed on the tunneling oxide layer, wherein the polysilicon layer comprises alternatively distributed N+ polysilicon areas and P+ polysilicon areas, and a space is arranged between each neighboring N+ polysilicon area and P+ polysilicon area. The tunneling oxide layer, the N+ polysilicon areas and the P+ polysiliconareas form a passivation contact structure on the back surface of the N-type silicon substrate. According to the crystalline silicon solar cell and the preparation method thereof, the recombination rate of the back surface of a battery is effectively reduced, and the open circuit voltage of the battery is improved. Compared with the conventional back knot and back contact solar cells, the doping process of the front surface is saved, the battery preparation process is simplified, the absorption loss of light is reduced, and thus the solar cell can facilitate the improvement of battery performance and the reduction of cost.

A photovoltaic device is provided comprising a layer. The layer comprises a plurality of grains separated by grain boundaries wherein the grains are either p-type or n-type. The grain boundaries comprise an active dopant. The active dopant concentration in the grain boundaries is higher than the effective dopant concentration in the grains. The grains and grain boundaries may be of the same type or of the opposite type. Further, when the grain boundaries are n-type the bottom of the grain boundaries may be p-type. A method of making the layer is also disclosed.