543 results about "Surface etching" patented technology

Methods for controlled isotropic etching of layers of silicon oxide and germanium oxide with atomic scale fidelity are provided. The methods make use of NO activation of an oxide surface. Once activated, a fluorine-containing gas or vapor etches the activated surface. Etching is self-limiting as once the activated surface is removed, etching stops since the fluorine species does not spontaneously react with the un-activated oxide surface. These methods may be used in interconnect pre-clean applications, gate dielectric processing, manufacturing of memory devices, or any other applications where accurate removal of one or multiple atomic layers of material is desired.

Semiconductor devices and methods of manufacturing semiconductor devices. A semiconductor device includes a metal gate electrode stacked on a semiconductor substrate with a gate insulation layer disposed therebetween, spacer structures disposed on the semiconductor substrate at both sides of the metal gate electrode, source/drain regions formed in the semiconductor substrate at the both sides of the metal gate electrode, and an etch stop pattern including a bottom portion covering the source/drain regions and a sidewall portion extended from the bottom portion to cover a portion of sidewalls of the spacer structures, in which an upper surface of the sidewall portion of the etch stop pattern is positioned under an upper surface of the metal gate electrode.

A microneedle array module is disclosed comprising a multiplicity of microneedles affixed to and protruding outwardly from a front surface of a substrate to form the array, each microneedle of the array having a hollow section which extends through its center to an opening in the tip thereof. A method of fabricating the microneedle array module is also disclosed comprising the steps of: providing etch resistant mask layers to one and another opposite surfaces of a substrate to predetermined thicknesses; patterning the etch resistant mask layer of the one surface for outer dimensions of the microneedles of the array; patterning the etch resistant mask layer of the other surface for inner dimensions of the microneedles of the array; etching unmasked portions of the substrate from one and the other surfaces to first and second predetermined depths, respectively; and removing the mask layers from the one and the other surfaces. One embodiment of the method includes the steps of: providing an etch resistant mask layer to the other surface of the substrate to a predetermined thickness; patterning the etch resistant mask layer of the other surface to define a reservoir region in the substrate; and etching away the unmasked reservoir region of the substrate to form a reservoir well in the other surface of the substrate. A layer of material may be provided to the other surface to enclose the reservoir well and a passageway is provided through the layer to the well region.

The invention provides a chemical etching liquid for metals. The chemical etching liquid comprises ferric chloride, hydrochloric acid, phosphoric acid, hydrogen nitrate, a corrosion inhibitor and a surface active agent. The corrosion inhibitor is at least one of hexamethylene tetramine, ethidene diamine, triethanolamine and heptadecane amide; and the surface active agent is one or two of sodium lauryl benzenesulfate and dodecyl alcohol amine. The invention further discloses a chemical etching method for metals; with the method, the metals are etched through spraying the etching liquid; and the etching liquid is provided by the invention. The etching liquid provided by the invention can be applied to surface etching of various metals, particularly stainless steel, copper and aluminum alloy; and since the metals can be etched with the same etching liquid, the consumption of equipment is reduced.

The invention belongs to the field of absorbing material research, and particularly relates to a method for preparing stealthy fabric with double functions of radar stealth and infrared stealth. According to the method, the binding strength of a radar stealth layer and textile is improved by using electrostatic interaction between plasma grafting-introduced carboxyl and polyaniline absorbing materials and the surface etching effect of low-temperature plasma; the binding strength of the radar and the infrared stealth layers and the textile is improved by using the reactivity between a binary aldehyde crosslinking agent and amino on a polyaniline polymer and a microcapsule wall material and a polyurethane adhesive; the obtained stealth coating is not only good in binding strength with the textile, but also light in quality and good in durability, and has multi-band stealth effects of radar, infrared light and visible light.

Etching interleaved structures of semiconductor material forming fins of finFETs and local isolation material interposed between the fins is performed alternately and cyclically by alternating etchants cyclically such as by alternating gases during reactive ion etching. Etchants are preferably alternated when one of the semiconductor material and the local isolation material protrudes above the other by a predetermined distance. Since protruding surfaces are etched more rapidly than recessed surfaces, the overall etching process is accelerated and completed in less time such that erosion of other materials to which the etchants are less than optimally selective is reduced and allow improved etching of trenches for improved isolation structures to be formed.

The invention discloses a durable super-hydrophilic or super-hydrophobic plastic surface and a preparation method thereof. The method comprises the following steps of: (1) etching a micron-scale structure on the surface of a plastic substrate by using a laser etching instrument, and then cleaning and drying the etched plastic substrate; (2) preparing hydrophilic or hydrophobic modified nano-silica; (3) coating the surface of the dried plastic substrate obtained in the Step (1) with a prepared a colloidal solution of a bonding layer, drying, and then coating with a hydrophilic or hydrophobic modified nano-silica particle solution, and drying to obtain the durable super-hydrophilic or super-hydrophobic plastic surface. The preparation method of the invention is carried out at a low temperature, which ensures that the plastic substrate will not be molten or deform and guarantees the durability of the super-hydrophilic or super-hydrophobic plastic surface. The preparation method has a goodindustrial application prospect.

A wafer processing method for dividing, along streets, a wafer having a device area where devices are formed in a plurality of areas sectioned by the plurality of streets arranged in a lattice pattern on the front surface of a substrate and a peripheral extra area and comprising electrodes which are embedded in the substrate of the device area, comprising a dividing groove forming step for forming dividing grooves having a depth corresponding to the final thickness of each device along the streets; an annular groove forming step for forming an annular groove having a depth corresponding to the final thickness of each device along the boundary between the device area and the peripheral extra area; a protective member affixing step for affixing a protective member to the front surface of the wafer; a rear surface grinding step for grinding a rear surface corresponding to the device area of the substrate of the wafer to expose the dividing grooves and the annular groove to the rear surface of the substrate of the wafer and form an annular reinforcing portion in an area corresponding to the peripheral extra area; and a rear surface etching step for etching the rear surface of the substrate of the wafer to project the electrodes from the rear surface of the substrate.

A related unsealing method for a flip-chip packaging device comprises the following steps: S100) performing X-ray detection on the device, so as to obtain a device X-ray photograph; S200) performing device inlaying; S300) performing grinding on the inlayed device by taking the X-ray photograph as a reference; S400) performing acid dropping and cleaning on the ground device; S500) performing microscope detection, returning to the step S400) is the chip surface residue is detected, and stopping until the chip surface etching is clean. The beneficial effects comprise that the method is applicable to all flip-chip packaging devices at present, and comprises sealing, ceramic packaging and plastic packaging; through X-ray detection, the chip welding spot layout is determined, the grinding ending point can be precisely determined, and insufficient grinding and excessive grinding are both avoided; and through the process of manually dropping an acid and performing microscope detection and dropping the acid again, the etching degree is strictly controlled, the unsealing quality is guaranteed, and the welding spots and boding spots of a chip are prevented from being automatically excessively corroded.

The invention discloses a manufacturing method of a 3D (three-dimensional) glass plate. The manufacturing method includes the steps of S1, providing a large glass plate; S2, coating the large glass plate with an acid-resisting protective layer pattern; S3, etching a surface of the large glass plate with an acidic etchant, and etching the surface of the large glass plate to obtain a plurality of grooves; S4, performing washing with water; S5, removing the acid-resisting protective layer pattern from the surface of the large glass plate with an alkaline reagent; S6, performing washing with water; S7, splitting the large glass plate into a plurality of small glass plates, and providing the middle of each small glass plate with a recess; S8, using a CNC engraving and milling machine to engrave and mill a sidewall of the recess in one side of each small glass plate to form a curved surface, enabling smooth connection between the bottom of the recess and other parts of this surface of the small glass plate, using the CNC engraving and milling machine to engrave and mill the other side of the small glass plate to provide the edge of this surface of the small glass plate with an arc surface reversely curved; S9, using a brush-polishing machine to brush-polish the small glass plates. The manufacturing method of the 3D glass plate provided by the invention enables improvement of productivity and yield.

The invention provides an electroplating method for a double-side and multilayer flexible printed circuit board, which sequentially comprises the following steps of copper foil cutting, mechanical drilling of a first through hole, hole blackening, primary dry film pressing, primary exposure, primary development, pattern electroplating, chemical grinding, secondary dry film pressing, secondary exposure, secondary development, circuit etching and dry film removal. The pattern electroplating comprises the processes that a copper-clad plate is in contact with electroplating liquid, a copper layer is plated between positions without dry film coverage including the first through hole and circuit patterns, and the copper layer is not plated and covered on the surface of a circuit pattern without the dry film coverage. The circuit etching comprises the processes that the copper-clad plate is in contact with etching liquid, and the circuit patterns are etched onto the surface of the copper-clad plate. The electroplating method has the advantages that the circuit patterns are formed during the electroplating exposure, the copper plating is adopted between circuits so that products become hard, the products can be preferably protected, the folding crease is prevented, and the circuit defects can be obviously avoided. The method only adopts once dry film removal, the cost is reduced, the delivery speed is accelerated, simultaneously, the folding crease is also prevented, and the qualification rate of finished products is improved.

The invention discloses a manufacture method of a multilayer gradient nano-composite diamond film of the surface of die steel. The manufacture method includes that a plunger undergoing conventional pretreatment is arranged in a vacuum system of a magnetron sputtering composite vapor deposition system, and multiple layers of gradient films are sequentially deposited. Each layer of the multiple gradient transition layers undergoes high-temperature annealing treatment and argon ion surface etching treatment so as to improve binding force of the films and a base. The defects of high internal stress and poor adhesive force and the like of a conventional diamond film on the surface of the mold steel are overcome.

Provided is a method of manufacturing a substrate for a liquid discharge head, the substrate including a silicon substrate with a liquid supply opening formed therein, the method including: forming one processed portion by laser processing on the substrate from one surface of the substrate; expanding the one processed portion to form a recess portion by performing laser processing at a position which overlaps a part of the one processed portion and does not overlap another part of the one processed portion; and etching from the one surface the substrate with the recess portion formed therein to form the liquid supply opening.