Abstract:
A method of manufacturing a colloidal silica dispersion, by dissolving a fumed silica in an aqueous solvent having an alkali metal hydroxide to produce an alkaline silicate solution; removing the alkali metal via ion exchange to produce a silicic acid solution; adjusting the temperature, concentration and pH of the silicic acid solution to values sufficient to initiate nucleation and particle growth at elevated temperatures; and cooling the silicic acid solution at a rate sufficient to produce the colloidal silica dispersion. The colloidal silica particles in the colloidal silica dispersion have a mean particle size about 2 nm to about 100 nm. Also provided is a method of chemical mechanical polishing a surface of a substrate by contacting the substrate and a composition having a plurality of colloidal silica particles according to the present invention and a medium for suspending the particles. The contacting is carried out at a temperature and for a period of time sufficient to planarize the substrate.
Abstract:
A method of chemical mechanical polishing a surface of a substrate including the step of: contacting the substrate and a composition including a plurality of colloidal silica particles having less than 200 ppb of each trace metal impurity, excluding potassium and sodium, have less than 2 ppm residual alcohol and wherein the cumulative concentration of the trace metal, excluding potassium and sodium, is in the range from about 0.5 to about 5 ppm; and a medium for suspending the particles; wherein the composition is an ultrapure colloidal silica dispersion; and wherein the contacting is carried out at a temperature and for a period of time sufficient to planarize the substrate.
Abstract:
Fluid processing apparatuses and systems are disclosed. In some embodiments the fluid processing apparatuses include a movable enclosure (38), a plurality of filter housings (30) disposed substantially within the movable enclosure (38), and a stand (36) disposed within the enclosure (38). The filter housings (46a; 47a; 48a) are in fluid communication with one another. Each filter housing (46a; 47a; 48a) defines an elongate path and is configured to support a respective filter (49) along the elongate flow path to filter a substantially continuous flow of fluid. The stand (36) supports each filter housing (46a; 47a; 48a) such that the elongate flow path of each filter housing (46a; 47a; 48a) is substantially parallel to a vertical axis, wherein each filter housing (46a; 47a; 48a) is independently rotatable, relative to the stand (36).
Abstract:
A composition for chemical mechanical polishing a surface of a substrate having a plurality of ultra high purity sol gel processed colloidal silica particles for chemical mechanical polishing having alkali metals Li, Na, K, Rb, Cs, Fr and a combination thereof, at a total alkali concentration of about 300 ppb or less, with the proviso that the concentration of Na, if present, is less than 200 ppb; and a medium for suspending the particles is provided. Also, provided are methods of chemical mechanical polishing which included a step of contacting a substrate and a composition according to the present invention. The contacting is carried out at a temperature and for a period of time sufficient to planarize the substrate.
Abstract:
A method of forming a colloidal dispersion includes providing a first continuous material flow, providing a second continuous material flow, combining the first and second continuous material flows, and moving a continuous flow of a colloidal dispersion in a direction downstream of the first and second continuous flows. The first continuous material flow includes one or more of a diluent (e.g., deionized water), a base, and an acid, and the second continuous material flow includes an abrasive particle solution. The first and second material flows are combined with a Reynolds number greater than about 4400 and less than about 25000 (e.g., about 74000 to about 25000). The colloidal dispersion includes the diluent, the base, the acid, and abrasive particles from the abrasive particle solution.
Abstract:
The present disclosure provides a concentrate for use in chemical mechanical polishing slurries, and a method of diluting that concentrate to a point of use slurry. The concentrate comprises abrasive, complexing agent, and corrosion inhibitor, and the concentrate is diluted with water and oxidizer. These components are present in amounts such that the concentrate can be diluted at very high dilution ratios, without affecting the polishing performance.
Abstract:
A method for removing particles or deposits from a surface having particles or deposits thereon. The method involves contacting a surface with a chemical composition sufficient to selectively dissolve and remove at least a portion of the particles or deposits from the surface. The chemical composition is compatible with the surface. This disclosure also relates to a system of specially designed equipment for removing particles or deposits from a surface having particles or deposits thereon. The disclosure is useful, for example, in cleaning porous surfaces, media for cartridge, pleated and membrane surfaces, and internal walls of tanks or filter housings.
Abstract:
A water-soluble polymer is effective as a removal rate enhancer in a chemical mechanical polishing slurry to polish copper on semiconductor wafers or other copper laid structures, while keeping the etching rate low. The slurry may also include soft particles and certain metal chelating agents, or combinations thereof. The slurry can also comprise an abrasive particle, an organic acid, and an oxidizer.
Abstract:
A highly dilutable chemical mechanical polishing concentrate comprises an abrasive, an acid, a stabilizer, and water with a point-of-use pH ranging from 2.2 - 3.5 for planarizing current and next generation semiconductor integrated circuit FEOL/BEOL substrates. A transistor is polished with the slurry, wherein the slurry comprises an abrasive, an acid, a stabilizer, and water. The transistor comprises a polysilicon gate, a hardmask over the polysilicon gate, an etch stop layer over the hardmask, and a dielectric layer over the etch stop layer. The polishing concentrate is used to polish the dielectric layer, the etch stop layer, the hardmask, and the polysilicon gate with the slurry. At least one of the layers is silicon carbide and at least one of the layers is a silica material.
Abstract:
CMP compositions providing stable and robust polishing performance at elevated pad or wafer surface temperatures are disclosed, as well as methods for use thereof. The compositions of the disclosure include reaction rate optimizing (RRO) compounds that optimize various chemical reactions occurring in the slurry chemistry at elevated polishing temperatures on the wafer surface, such that removal rate variation within an individual wafer is