76 results about "Silicon nanocrystal" patented technology

One embodiment of a method used to form a floating gate for a memory device comprises forming a crystallization nucleus seed layer using a process comprising disilane (Si₂H₆), then converting the seed layer into a plurality of electrically-isolated silicon nanocrystals using a process comprising silane (SiH₄). The method described uses lower temperatures than previous silicon nanocrystal formation with improved uniformity of the completed silicon nanocrystals.

A rare earth-doped solid-state integrated laser which includes an optical waveguide, and a laser cavity including at least one subwavelength mirror. The subwavelength mirror is disposed in or on the optical waveguide. The optical waveguide portion within the laser cavity includes active media comprising both a rare earth and semiconducting atoms or compounds. A structure for pumping the semiconducting semiconducting atoms or compounds is provided, such as electrodes sandwiching the active media wherein the semiconducting atoms or compounds transfer energy obtained from the pumping to the rare earth, thus permitting the laser to laze.

The invention discloses a preparation method of silicon carbide nanometer crystal whiskers. According to the technical scheme, 10 wt%-40 wt% of organosilicone and 60 wt%-90 wt% of pitch organic solvent soluble components or resin organic solvent soluble components, co-cracking is conducted on an obtained solution for 2-6 h on the condition that the temperature ranges from 250 DEG C to 450 DEG C, and silicon-doped pitch or silicon-doped resin is obtained; carbonization is conducted on the silicon-doped pitch or the silicon-doped resin for 1-3 h on the conduction that the temperature ranges from 700 DEG C to 900 DEG C, and silicon-doped pitch-based carbon materials or silicon-doped resin-based carbon materials are obtained. The silicon-doped pitch-based carbon materials or the silicon-doped resin-based carbon materials are ground into fine powder and filled into a mold, mechanical pressing is conducted, and demoulding is conducted; a graphite crucible filled with a green body is put into a high-temperature carbonization furnace, heat treatment is conducted for 1-3 h at the temperature ranging from 1200 DEG C to 1800 DEG C in an inert atmosphere, natural cooling is conducted, and the silicon carbide nanometer crystal whiskers are obtained. According to the preparation method of the silicon carbide nanometer crystal whiskers, a catalyst does not need to participate, and the prepared silicon carbide nanometer crystal whiskers have the advantages of being high in purity, large in length-diameter radio and easy to collect.

A method for manufacturing a non-volatile memory is provided. First, a tunneling dielectric layer is formed over a substrate. A plurality of silicon nanocrystals is formed on the tunneling dielectric layer. A silicide process is performed on the silicon nanocrystals to form a plurality of salicide nanocrystals. A dielectric layer and a conductive layer are sequentially formed on the substrate to cover the salicide nanocrystals and the tunneling dielectric layer. The conductive layer, the dielectric layer, the salicide nanocrystals and the tunneling dielectric layer are patterned to form a gate structure. A source/drain region is formed in the substrate on the respective sides of the gate structure.

An improved semiconductor device, including a capacitor structure. The device has a first electrode member, which has a first length and a first width. The device also has a second electrode member, which has a second length and a second width. Additionally, the device includes a capacitor dielectric material provided between the first electrode member and the second electrode member according to a specific embodiment. Depending upon the embodiment, the capacitor dielectric material is made of a suitable material or materials such as Al₂O₃, HfO₂, SiN, NO, Al₂O₃/HfO₂, AlN_yO_x, ZrO₂, any combinations of these, and the like. The device further includes a plurality of silicon nanocrystals spatially disposed in an area associated with the first width and the first length of the first electrode member. Each one of the nanocrystals has a size of about 20 nanometers and less according to a specific embodiment.

The invention discloses a method for on-line detection of the form of silicon nanocrystals. The method comprises the following steps of: preparing a plurality of silicon plates serving as substrates, and growing a tunneling medium layer on the surface of each substrate; treating the surfaces of the substrates by using diluted hydrofluoric acid, and growing a layer of silicon nanocrystals on the surface of each substrate; irradiating incident light which is monochromatic light with a 365nm wave length onto the surfaces of the substrates, wherein because surface materials and shapes are different, the intensity of reflected light is certainly changed; recording reflection indexes of nanocrystalline silicon chips in various growth periods, and establishing an expression of the relationship between the growth periods and the reflection indexes; performing fragment analysis of various silicon chips by using a scanning electronic microscope and a transmission electron microscope, determining the forms of the nanocrystals in different growth periods, and establishing an expression of the relationship between different forms of the nanocrystals and the growth periods; and establishing a corresponding expression of the relationship between the different forms and the reflection indexes of the nanocrystalline, and determining the form of the growing nanocrystals according to a reflection index. By the method, the on-line quick detection of the form of the silicon nanocrystals is realized.

The invention discloses a method for manufacturing a crystalline silicon high-efficiency solar cell, which comprises: preparing a textured surface structure on the surface of a crystalline silicon substrate; forming a PN junction structure on the crystalline silicon substrate by a diffusion method; forming a silicon nanocrystal structure on the surface by using thin film deposition technology and heat treatment; depositing a silicon nitride antireflective film on the surface of the substrate by using a plasma-reinforced chemical vapor deposition method; making an anode and a cathode by screen printing; and alloying to make the surface silicon nanocrystal modulated solar cell. In the invention, the PN junction crystalline silicon solar cell prepared by a process means used in a mass production is used, silicon nanocrystals are formed on the surface of the PN junction crystalline silicon solar cell, and under the modulating action of the silicon nanocrystals, the crystalline silicon cell can utilize the solar wavelength more effectively to improve the efficiency of the crystalline silicon cell. The method is compatible with the convenient mature large-scale production technology, has the characteristics of simple production process, easy industrialization and the like and can effectively reduce cost and acquire the high-efficiency crystalline silicon solar cell.

The invention specifically relates to a method for preparing silicon nanocrystalline with optical gain which can be improved by high-pressure hydrogen passivation. According to the method provided bythe invention, in virtue of the hydrogen passivation principle which is common in the field of semiconductor electronic circuits, hydrogen is used as a basic raw material for material treatment, and the means of proper heating and high-pressure sealing are used, so that material passivation is realized. The silicon nanocrystalline is used as a whole silicon luminescent material, and a large numberof defect centers can be produced in the preparation process of the silicon nanocrystalline. Part of defects in a luminescent material can be effectively saturated and eliminated through the high-pressure hydrogen passivation, and the non-radiation recombination centers are reduced, so that the effects of remarkably increasing the luminous intensity and the optical gain of the nanocrystalline silicon can be realized, and thus the nano crystalline silicon material with improved optical gain can be used for developing a novel silicon laser. The invention provides the hydrogen passivation methodwhich is different from conventional high-temperature hydrogen passivation and plasma hydrogen passivation, and according to the process, high temperature does not need to be maintained, the plasma discharge process is not needed, the luminescence enhancing effect on the material is remarkable, the cost is low, the operation is simple, and the process is safe and controllable.

The invention discloses an erbium silicate crystal and silicon nanocrystal co-inlaid silicon dioxide film and a preparation method and application thereof. A silicon-rich erbium silicate film is prepared by reactive co-sputtering, and the erbium silicate crystal and the silicon nanocrystal are obtained by high-temperature heat treatment. The invention also discloses a low-turn-on-voltage high-efficiency infrared light emitting diode prepared on the basis of the film. Due to the formation of the silicon nanocrystals, the conductivity of the film is enhanced, and the device turn-on voltage is reduced. Due to the formation of the erbium silicate crystal, the effective doping concentration of film erbium is improved, the infrared electroluminescence intensity of the device is improved, and theefficiency is greatly improved. The method is simple in preparation process and good in industrial compatibility, and has a wide application prospect in the fields of silicon-based integrated light source or semiconductor light emitting, optical communication and the like.

A method is disclosed for isolating single atoms of an atomic species of interest by locating the atoms within silicon nanocrystals. This can be done by implanting, on the average, a single atom of the atomic species of interest into each nanocrystal, and then measuring an electrical charge distribution on the nanocrystals with scanning capacitance microscopy (SCM) or electrostatic force microscopy (EFM) to identify and select those nanocrystals having exactly one atom of the atomic species of interest therein. The nanocrystals with the single atom of the atomic species of interest therein can be sorted and moved using an atomic force microscope (AFM) tip. The method is useful for forming nanoscale electronic and optical devices including quantum computers and single-photon light sources.

The invention includes optical signal conduits having rare earth elements incorporated therein. The optical signal conduits can, for example, contain rare earth elements incorporated within a dielectric material matrix. For instance, erbium or cerium can be within silicon nanocrystals dispersed throughout dielectric material of optical signal conduits. The dielectric material can define a path for the optical signal, and can be wrapped in a sheath which aids in keeping the optical signal along the path. The sheath can include any suitable barrier material, and can, for example, contain one or more metallic materials. The invention also includes methods of forming optical signal conduits, with some of such methods being methods in which the optical signal conduits are formed to be part of semiconductor constructions.

The invention provides a fluorescent material which contains a mesoporous material and a modified silicon nanocrystal. The modified silicon nanocrystal is prepared by performing silicon hydrogenation reaction on a silicon nanocrystal and silane compounds of which the general formula is R1Si(OR2)3, wherein R1 is an alkenyl group, and R2 is a substituted or unsubstituted alkyl group. The invention also provides a preparation method of the fluorescent material, which comprises the following step: in the presence of an organic solvent, mixing and contacting the modified silicon nanocrystal and the mesoporous material, wherein the modified silicon nanocrystal is prepared by performing silicon hydrogenation reaction on the silicon nanocrystal and silane compounds of which the general formula is R1Si(OR2)3, wherein R1 is an alkenyl group, and R2 is a substituted or unsubstituted alkyl group. The invention also provides application of the fluorescent material as a drug conduction carrier. The fluorescent material has fluorescent characteristic, and has the advantages of high capacity for resisting photofading and better drug slow-release property.

The invention discloses a preparation method of a poly(N-isopropyl acrylamide) sphere modified fluorescent silicon dot, the prepared fluorescent silicon dot and application. The preparation method comprises the following steps: reacting sodium citrate and 3-aminopropyl triethoxysilane in glycerol to prepare a silicon nanocrystalline quantum dot; reacting silicon nanocrystalline quantum dots, 1-(3-dimethylaminopropyl)-3-ethylcarbodiimide hydrochloride, N-hydroxysuccinimide and folic acid in pure water to obtain folic acid modified silicon nanocrystalline quantum dots; and reacting N-isopropylacrylamide, N,N'-methylene diacrylamide, the folic acid modified silicon nanocrystalline quantum dots and potassium persulfate in pure water to obtain the fluorescent silicon dots modified by the polyisoacrylamide spheres. The polyisoacrylamide sphere modified fluorescent silicon dot prepared by the method is low in cytotoxicity, has a function of responding to temperature change, can be used for cancer cell in-situ imaging and temperature detection, and is simple and feasible in preparation process and easy for large-scale production.

The invention discloses a silicon nanocrystal/graphene wide-spectrum photodetector and a preparation method thereof. The structure comprises a back electrode, a substrate, a silicon nanocrystal layer,a graphene layer and a front electrode in order from bottom to top. The back electrode is a Ti/Au/Ti electrode. The substrate is heavily doped with n-type Si. The silicon nanocrystal layer is spin-coated with hydrogen-silsesquioxane and annealed at high temperature. The graphene layer is single-layer graphene, which is acquired by transferring vapor-deposited Au. The front electrode is a Ti/Au electrode. The photodetector provided by the invention can respond to ultraviolet, visible and near-infrared optical spectrum ranges, achieves signal doubling through the photo-switching effect betweenthe silicon nanocrystal layer and the graphene layer, has a simple preparation process, and is compatible with the CMOS process.

The invention belongs to the technical field of preparation of a silicon-based LED, and particularly relates to preparation method and application of an Ag surface plasmon-containing silicon-based LED. The preparation of the Ag surface plasmon-containing silicon-based LED is completed according to four steps of immersion, primary annealing, secondary annealing and third annealing, silver nitrate is decomposed to Ag nanoparticles by adjusting ultrasound and an annealing parameter, the Ag nanoparticles are used as silicon nanocrystal surface plasmon, so that the surface plasmon field of the silicon-based LED is further improved, and the light-emitting intensity of the silicon-based LED is improved; and optimal light-emitting intensity can be obtained by applying biases to two ends of the silicon-based LED and changing the sizes of the applied biases.

The present red light-emitting device includes a substrate with a first window layer, a silicon dioxide layer positioned on the first window layer, a plurality of silicon nanocrystals distributed in the silicon dioxide layer, a second window layer, a transparent conductive layer and a first ohmic contact electrode positioned in sequence on the silicon dioxide layer, and a second ohmic contact electrode positioned on the bottom surface of the substrate. The present method forms a sub-stoichiometric silica (SiO_x) layer on a substrate, wherein the numerical ratio (x) of oxygen atoms to silicon atoms is smaller than 2. A thermal treating process is then performed in an oxygen atmosphere to transform the SiOx layer into a silicon dioxide layer with a plurality of silicon nanocrystals distributed therein. The thickness of the silicon dioxide layer is between 1 and 10,000 nanometers, and the diameter of the silicon nanocrystal is between 3 and 5 nanometers.

A method is provided for optical amplification using a silicon (Si) nanocrystal embedded silicon oxide (SiOx) waveguide. The method provides a Si nanocrystal embedded SiOx waveguide, where x is less than 2, having a quantum efficiency of greater than 10%. An optical input signal is supplied to the Si nanocrystal embedded SiOx waveguide, having a first power at a first wavelength in the range of 700 to 950 nm. The Si nanocrystal embedded SiOx waveguide is pumped with an optical source having a second power at a second wavelength in a range of 250 to 550 nm. As a result, an optical output signal having a third power is generated, greater than the first power, at the first wavelength. In one aspect, the third power increases in response to the length of the waveguide strip.

The invention provides a fluorescent material which contains an ordered mesoporous material and a modified silicon nanocrystal. The modified silicon nanocrystal is prepared by performing silicon hydrogenation reaction on a silicon nanocrystal and silane compounds of which the general formula is R1Si(OR2)3. The invention also provides a preparation method of the fluorescent material, which comprises the following step: in the presence of an organic solvent, mixing and contacting the modified silicon nanocrystal and the ordered mesoporous material, wherein the modified silicon nanocrystal is prepared by performing silicon hydrogenation reaction on the silicon nanocrystal and silane compounds of which the general formula is R1Si(OR2)3. The invention also provides application of the fluorescent material as a drug conduction carrier. The fluorescent material has fluorescent characteristic, and has the advantages of high capacity for resisting photofading and better drug slow-release property.