Abstract:
The invention includes a semiconductive processing method of electrochemical-mechanical removing at least some of a conductive material from over a surface of a semiconductor substrate. A cathode is provided at a first location of the wafer, and an anode is provided at a second location of the wafer. The conductive material is polished with the polishing pad polishing surface. The polishing occurs at a region of the conductive material and not at another region. The region where the polishing occurs is defined as a polishing operation location. The polishing operation location is displaced across the surface of the substrate from said second location of the substrate toward said first location of the substrate. The polishing operation location is not displaced from said first location toward said second location when the polishing operation location is between the first and second locations. The invention also includes a semiconductor processing method of removing at least some of a conductive material from over a surface of a semiconductive material wafer. A polishing pad is displaced across an upper surface of the wafer from a central region of the wafer toward a periphery of the wafer, and is not displaced from the periphery to the central region.
Abstract:
An apparatus and a method for plating and/or polishing wafer. The apparatus includes a wafer chuck, an auxiliary nozzle apparatus(140, 240, 340) and a main nozzle apparatus (180, 208, 380). For plating and/or polishing the wafer,the wafer chuck holds and positions the wafer and horizontally moves and rotates. The auxiliary nozzle apparatus supplies uncharged or charged electrolyte to cover the outer edge of the wafer and the wafer chuck, he main nozzle apparatus supplies charged electrolyte to the surface of the wafer. The present invention can improve the plating and/or polishing uniformity of the outer edge of the wafer and reduce the entire electric resistance of the apparatus and improve the plating and/or polishing rate.
Abstract:
Removing metal from a semiconductor substrate by dissolving ions of the metal into an electrolyte, comprising the steps of: applying a voltage across a polishing pad and the substrate, while an electropolishing electrolyte is dispensed at an interface of the substrate and the polishing pad, and while pooling the electrolyte about the substrate by the polishing pad.
Abstract:
The present invention provides for a wet etch (10) and method for preparing a semiconductor device structure (22) from a silicon carbide wafer. A first embodiment of the wet etch comprises a vessel (12), a tetrahydrofurfuryl alcohol and potassium nitrite etching solution (14) within the vessel (12), an electrode (20), a wafer support (16) for positioning at least a portion of the silicon carbide wafer (22) within the etching solution (14), and a voltage source (21) coupled with the electrode (20) and the wafer support (16). A second embodiment of the wet etch (10) comprises a wafer carrier (32) for holding at least one wafer (22), a polishing plate (36) adjacent the wafer carrier (32), a voltage source (21) having a first terminal electrically coupled with the wafer (22) and a second terminal electrically coupled with the polishing plate (36), and an applicator (40) adjacent the polishing plate (36) for depositing an etching solution (14) on a surface of the polishing plate (36).
Abstract:
A method and apparatus for pulse electrochemical polishing a wafer are disclosed. The method comprises steps of: establishing a duty cycle table showing all points on the wafer, a removal thickness corresponding to every point and a duty cycle corresponding to the removal thickness; driving a wafer chuck (5) holding and positioning the wafer (8) to move at a preset speed so that a special point on the wafer (8) is right above a nozzle (6) ejecting charged electrolyte (7) onto the wafer (8); looking up the duty cycle table and obtaining the removal thickness and the duty cycle corresponding to the special point; and applying a preset pulse power source to the wafer (8) and the nozzle (6) and the actual polishing power source for polishing the special point being equal to the duty cycle multiplying by the preset power source.
Abstract:
Compositions and methods suitable for the electrochemical mechanical planarization of a conductive material layer on a semiconductor workpiece. Compositions contain a phosphonic acid based electrolyte, a corrosion inhibitor, a chelating agent, a pH adjusting agent, and a solvent as the remainder.
Abstract:
Removing metal from a semiconductor substrate by dissolving ions of the metal into an electrolyte, comprising the steps of: applying a voltage across a polishing pad and the substrate, while an electropolishing electrolyte is dispensed at an interface of the substrate and the polishing pad, and while pooling the electrolyte about the substrate by the polishing pad.
Abstract:
Semiconductor wafers for the production of electronic components must have a surface as perfect as possible for subsequent processes. For that purpose a flat n-Si body is electrolytically polished in a fluoride-containing electrolyte solution to which is applied an anodic potential while the surface to be treated is irradiated with light whose energy is at least equal to that of the band gap, or a flat p-Si body is similarly treated in a dark environment. At the same time, an electroanalytic monitoring process is carried out to detect the occurrence of a periodic current oscillation. The surface is polished during a few such current oscillations. The treatment comprises in particular the anodic oxidation and electrochemical etching of the surface, if required also an electric polishing process, and allows a high electronic quality characterised by the interface state density to be obtained by immediate hydrogen termination during the transient dark current that sets in.