81 results about "Silicon nanostructures" patented technology

The present invention relates to nanostructured materials for use in rechargeable energy storage devices such as lithium batteries, particularly rechargeable secondary lithium batteries, or lithium-ion batteries (LIBs). The present invention includes materials, components, and devices, including nanostructured materials for use as battery active materials, and lithium ion battery (LIB) electrodes comprising such nanostructured materials, as well as manufacturing methods related thereto. Exemplary nanostructured materials include silicon-based nanostructures such as silicon nanowires and coated silicon nanowires, nanostructures disposed on substrates comprising active materials or current collectors such as silicon nanowires disposed on graphite particles or copper electrode plates, and LIB anode composites comprising high-capacity active material nanostructures formed on a porous copper and/or graphite powder substrate.

The invention discloses a method for preparing a one-dimensional silicon nanostructure in a anodic aluminum oxide mold, which comprises the following steps: growing the one-dimensional silicon nanostructure in low-temperature by the method of plasma chemical depositing with the spacing limited function of porous aluminium oxide, including the silicon nanowire and silicon nanotube, preparing a porous aluminum oxide mold with honeycomb structure by anodic oxidation process, wherein openings arrange ordered, apertures are coherent and vertical the surfaces of the mold, imbedding the mold into a plasma enhanced chemical depositing reaction chamber, growing the silicon nanowire or silicon nanotube at a temperature of 300 Deg. C by controlling the gas flow with the perhydrous diluting silane as the growth air supply.

A method for forming a silicon trench, comprises the steps of: defining an etching area at a silicon substrate; forming metal catalysts at the surface of the etching area; immersing the silicon substrate in a first etching solution thereby forming anisotropic silicon nanostructures in the etching area; immersing the silicon substrate in a second etching solution thereby resulting in the silicon nanostructures being side-etched and detached from the silicon substrate, thus forming the silicon trench.

A method for making silicon nano-structure, the method includes the following steps. Firstly, providing a growing substrate and a growing device, the growing device comprising a heating apparatus and a reacting room. Secondly, placing the growing substrate and a quantity of catalyst separately into the reacting room. Thirdly, introducing a silicon-containing gas and hydrogen gas into the reacting room. Lastly, heating the reacting room to a temperature of 500˜1100° C.

The invention, which belongs to the nanometer material performance and application field, discloses a visible photoelectrochemical detector based on a one-dimensional silicon nanostructure array. The detector is characterized in that: the detection of visible lights is allowed by utilizing response characteristic of photoelectrochemistry of the one-dimensional silicon nanostructure array that has good light absorption performance. The manufacturing process of the detector and required equipment are relatively simple. And the detector has good controllability and high optical responsivity. The construction process of a detector comprises the following steps: (1), preparing a one-dimensional silicon nanostructure array by utilizing a metal-catalyzed anisotropy chemical etching method; (2), depositing a conducting layer on the back of the one-dimensional silicon nanostructure array by utilizing a magnetron sputtering technology or a vacuum evaporation technology and carrying out annealing process to form a photoelectrode of the one-dimensional silicon nanostructure array; (3), constructing a visible photoelectrochemical detector based on the photoelectrode of the one-dimensional silicon nanostructure array. According to the invention, the visible photoelectrochemical detector is constructed by utilizing the high response characteristic of photoelectrochemistry of the one-dimensional silicon nanostructure array, thereby expanding the application field of semiconductor nanometer materials.

A method for forming a silicon substrate having a multiple silicon nanostructures includes the steps of: providing a silicon substrate; forming an oxidization layer on the silicon substrate; immersing the silicon substrate in a fluoride solution including metal ions, thereby depositing a plurality of metal nanostructures on the silicon substrate; and immersing the silicon substrate in an etching solution to etch the silicon under the metal nanostructures, the unetched silicon forming the silicon nano structures.

The invention discloses a nano-capacitor three-dimensional integrated structure and a preparation method thereof. The nano-capacitor three-dimensional integrated structure comprises a first nano-capacitor structure and a second nano-capacitor structure which are vertically stacked and formed in a groove of a silicon substrate, and the first nano-capacitor structure and the second nano-capacitor structure are connected in parallel. The high aspect ratio silicon nanostructure etched at one time is changed into the high aspect ratio silicon nanostructure etched at two times, so that the requirement on the precision of etching equipment can be reduced, and the manufacturing cost can be reduced. Due to the fact that the aspect ratio of a single silicon nanostructure is reduced, the step coverage rate of the thin film can be increased, the conformality of the thin film can also be enhanced, and therefore holes of the thin film in the deposition process can be reduced. And traditional sputtering equipment can be adopted to deposit a metal material, so that a metal electrode with relatively low resistivity can be obtained. Moreover, the overall capacitance density of the nano capacitor canbe improved, and the planar area occupied by the capacitor is reduced, so that a small-size energy buffer device can be obtained.

The invention discloses a silicon solar cell and a manufacturing method of the silicon solar cell. The manufacturing method of the silicon solar cell includes the following steps of firstly providing a metallurgical grade silicon wafer substrate and cleaning the metallurgical grade silicon wafer substrate, secondly etching the metallurgical grade silicon wafer substrate and conducting purification on the metallurgical grade silicon wafer substrate, thirdly conducting morphology modification on the surface of a silicon nanometer array, fourthly conducting morphology modification on the surface of the silicon nanometer array again, and fifthly coating the silicon nanometer array with conjugated organic matter. According to the manufacturing method of the silicon solar cell, the metallurgical grade silicon materials are applied to preparation of the solar cell, surface morphology treatment and surface purification treatment are conducted on the metallurgical grade silicon materials by fully applying the wet metal auxiliary chemical etching technology, and a silicon nanometer structure is formed. Passivating treatment is conducted on organic materials and the silicon nanometer structure, electrical performance and optical performance of a metallurgical grade silicon cell are improved, and charge separation performance and charge transmission performance are improved. Stability of the cell is improved through modification to organic-inorganic hybrid heterojunction, and the charge transmission capacity of the solar cell is enhanced.

The invention discloses a method for preparing a silicon nanostructured material, belonging to the field of new materials and nano materials. According to the method, dissolved oxygen in hydrofluoric acid solution is adopted as an oxidizing agent, a silicon nanostructure is etched on the surface of a silicon wafer through a primary battery corrosion technology, so that controllable preparation of various shapes of silicon nanostructured materials can be realized. The silicon nanostructured material prepared by the method can be used as excellent solar battery and photocatalysis materials, thermoelectric material and lithium ion battery cathode material, and has wide application prospect and practical value. The method has simple technologies, has low cost, and is convenient for large scale production.

The invention discloses a solar battery based on a silicon nano material. The solar battery based on the silicon nano material comprises a silicon wafer on which conductive glass is arranged; an insulation sealing layer is encircled between the conductive glass and the silicon wafer; an electrolyte chamber is formed between the conductive glass and the silicon wafer; ion liquid electrolyte is arranged in the electrolyte chamber; and lead-out electrodes are arranged on the backs of the conductive glass and the silicon wafer so as to form an ohm electrode structure. The solar battery has the characteristics of high thermal stability and chemical stability; a thinner silicon wafer can be used as a silicon electrode, the requirement for purity of the silicon is relatively low and the encapsulation requirement on the battery is reduced greatly at the same time. The invention also provides a low-cost, high-efficiency and stable technology for preparing the solar battery, which has a positive practical significance.

A simple chemical technique has been developed to grow large quantity of carbon nanostructures, including carbon nanotubes, hydrocarbon nanotubes and carbon nanoonions, in the organic solution at ambient (room) temperature and atmospheric pressure using silicon nanostructures (nanowires, nanodots, ribbons, and porous silicon) as starting materials. These CNT and CNO have the lattice d-spacing from 3.4 Å to 5 Å.

The invention provides a method for preparing a tri-dimension-limited crystal-facet-dependent silicon nanostructure, which is characterized by comprising the following steps: (a) taking silicon-on-insulator (SOI) as a substrate; (b) scribing on the substrate along the crystal orientation (110) as a reference direction for exposure; (c) performing heat oxidation on the substrate to generate a silica mask layer; (d) adopting electron-beam exposure to generate a plane figure; (e) eroding the silica mask layer by using isotropic corrosive liquids; and (f) obtaining the tri-dimension-limited crystal-facet-dependent silicon nanostructure on the silicon layer below the silica mask layer by using isotropic wet corrosion.

An electrode for a battery and a method for manufacturing the same are disclosed. The electrode for a battery according to the present invention comprising silicon nanostructures integrally formed on a silicon thin film and having a period array can reduce the internal resistance, have better charge transport properties, and reduce the structural stress, thereby exhibiting high storage capacity, high efficiency charge/discharge characteristics, and long charge/discharge cycle characteristics. Moreover, the method for manufacturing the electrode for a battery according to the present invention can simply and easily form a nanopattern with nanostructures on a silicon thin film using laser interference lithography (LIL) and dry etching.

The invention discloses a method for preparing a silicon nanostructured material based on an external electric field. The method comprises the following steps: (1) putting a clean silicon wafer into a mixed solution of hydrofluoric acid and silver nitrate to deposit a layer of silver film on the surface of the silicon wafer; (2) immediately putting the coated silicon wafer from the step (1) into a corrosive liquid, wherein the corrosive liquid is contained in a container; a pair of noble electrodes are fixed to two sides of the container; and the noble electrodes are immersed in the corrosive liquid; and (3) immediately turning on a power supply of the noble electrodes after the step (2) and corroding for a period of time to obtain the silicon nanostructured material. Only by changing a single variable of electric field, corrosion path of catalyst granules can be controlled according to the method. The method is simple and easy to operate and is beneficial to large-scale production. In addition, applicability of the silicon nanostructured material in aspects of solar cells, lithium ion batteries, thermo-electric devices, precision sensors and the like is enhanced.

The invention discloses a method for preparing a silicon nanostructure material or an array thereof. The method of the present invention comprises the following steps: using monocrystalline silicon as an anode and an inert electrode as a cathode, placing the anode and the cathode in an electrolytic solution, and adding a water-immiscible hydrocarbon solvent to the electrolytic solution; An electric current is applied to the anode to carry out an electrochemical oxidation reaction, and the silicon nanostructure material or its array is obtained after the reaction; wherein, the electrolyte is composed of a hydrofluoric acid solution with a mass concentration of 10-30%, an organic solvent and Catalyst composition; The organic solvent is methanol, ethanol or their mixture in any proportion, and the catalyst is polyacid compound, hydrogen peroxide or their mixture; The density of the water-immiscible hydrocarbon solvent is less than that of water density. By adjusting the type of catalyst and the current density of electrochemical reaction, the method can realize the controllable preparation of various silicon nanostructures and their arrays, and is a general preparation method for silicon nanostructures, which is simple and feasible.

The invention provides a silicon nanostructured heterojunction solar cell and a preparation method thereof, and belongs to the technical field of solar cells. The silicon nanostructured heterojunctionsolar cell is composed of a crystalline silicon nanostructured substrate S, an ultra-thin silicon oxide passivation layer P, an undoped hole transport layer H, an undoped electron transport layer E,a transparent electrode T, a metal gate line electrode M1 and a back electrode M2. The effective absorption of incident light is realized by utilizing the high trapping property of the silicon nanostructured substrate. The wide bandgap and high transmission characteristics of the non-doped electron (hole) transport layer are used to further reduce the parasitic absorption of a device and improve the photoelectric conversion efficiency. The electron (hole) transport layer of the silicon nanostructured solar cell does not involve a doping process, and both H and T have the characteristics of high transmission and low parasitic light absorption, the defect state density of the device can be effectively reduced, and the preparation method is simple and easy to implement.

The invention discloses a silicon nano-wire array or silicon nano-pore array Schottky junction type solar battery and a preparation method thereof. the preparation method is characterized in that an Al metal membrane back electrode layer is arranged on the bottom face of a P type silicon substrate layer and serves as a back lead-out electrode; the P type silicon substrate layer is arranged on the Al metal membrane back electrode layer and serves as a base region of the solar battery; a P type silicon nano-wire array layer is arranged on the upper surface of the P type silicon substrate layer, the surface of the P type silicon nano-wire array layer is coated with Ti metal layer and the Ti metal layer and the P type silicon nano-wire array layer form a Schottky junction; a Ti grid type electrode is arranged on the Ti metal layer and serves as a front lead-out electrode; and the silicon nano-wire array also can be replaced with a silicon nano-pore array. The preparation method has simple process steps, is suitable for large-scale production, can be used for preparing a solar battery with high light absorption capability and high photoelectric conversion efficiency and lays a foundation for the application of a silicon nano structure in the solar battery.

The invention discloses a method for preparing a silicon nanostructure material under alternative electric fields. The method comprises the following steps: 1, bonding six surfaces of bulk silicon with three pairs of independent inert electrodes, and drilling each of the inert electrodes with a fabrication hole, wherein the inert electrodes can generate alternative electrode fields; 2, putting the bulk silicon obtained in step 1 in a corrosive solution prepared by using hydrofluoric acid, hydrogen peroxide, a metal catalyst and deionized water; and 3, starting the inert electrodes after step 2, controlling the corrosion direction and the corrosion speed under three orthogonal alternative electric fields generated by the three inert electrodes under the frequency of the alternative electric fields of 28-40kHz, taking out the obtained bulk silicon after corrosion for a period of time, and cleaning to prepare the silicon nanostructure material. The method solves the problems of low metal assisted corrosion and low precision of the prepared silicon nanostructure, and controls the corrosion direction through the accurate control of metal catalyst particles by the alternative electric fields in order to realize accurate preparation of the three dimensional silicon nanostructure.