Abstract:
An arrangement for performing a multi-step polishing process on a single stage chemical mechanical planarization (CMP) apparatus utilizes an in-situ conditioning operation to continuously clean and evacuate debris and spent polishing slurry from the surface of the polishing pad. By presenting a clean, virtually "new" polishing pad surface at the beginning of each planarization cycle, polishing agents of different chemistries, morphologies, temperatures, etc. may be used without the need to remove the wafer to change the polishing source or transfer the wafer to another CMP polishing station. A multi-positional valve may be used to control the introduction of various process fluids, including a variety of different polishing slurries and conditioning/flushing agents. The use of different conditioning materials allows for the surface of the polishing pad to be altered for different process conditions (e.g., neutralizing prior polishing chemicals, modifying the surface temperature of the pad to control polishing rate, use of surfactants to dislodge particles that become attracted to the pad surface, etc.).
Abstract:
The present invention refers to a multi-station rotary machine for polishing wafers, comprising a machine body (1) and a rotating tower (2) consisting of a plurality of heads (3) each of which supports a wafer (4). Said tower (2) made to rotate with predefined pitch between a first station (25) for loading/unloading the wafers (4) and subsequent work stations all the same in which said heads (3) position themselves on rotatable polishing plates (5) on which rotating cleaning arms (6) act in the work phase with rotation pin and rotating end (7) in contact with the above mentioned plates (5). Between said work stations intermediate washing zones of the heads (3) and the wafers (4) are provided for by means of cleaning means (8, 17) that comprise delivery blocks (8) of washing liquid positioned between said plates (5) and each one having an upper hole (9) for the delivery of a nozzle (11) spraying liquid under pressure for cleaning one of said heads (3) and the lower part of the tower (2), and a supplementary hole connected to a further nozzle (13) for cleaning the machine body (1) and the rotation pin of one of said cleaning arms (6). Said cleaning means also comprise arms (17) for delivering the washing liquid positioned above said plates (5) with external support and each one having a supplementary lower hole (20) connected to a tube (21) that carries the liquid towards a further nozzle (22) for cleaning the lower part of said rotating arms (6) when they are in the rest position.
Abstract:
The invention provides a cell, a system and an article for processing a substrate in an electrochemical mechanical polishing system. A cell for polishing a substrate includes a polishing pad disposed on a top surface of a platen assembly. A plurality of conductive elements are arranged in a spaced-apart relation across the upper polishing surface and adapted to bias the substrate relative to an electrode disposed between the pad and the platen assembly. A plurality of passages are formed through the platen assembly between the top surface and a plenum defined within the platen assembly. A system is provided having a bulk polishing cell and a residual polishing cell. The residual polishing cell includes a biased conductive polishing surface. In further embodiments, the conductive element is protected from attack by process chemistries.
Abstract:
A polishing (102) pad for chemical mechanical planarization of a film on a substrate is customized by obtaining one or more characteristics of a structure on a substrate. For example, when the structure is a chip formed on a semiconductor wafer (104), the one or more characteristics of the structure can include chip size, pattern density, chip architecture, film material, film topography, and the like. Based on the one or more characteristics of the structure, a value for the one or more chemical or physical properties of the pad (102) is selected. For example, the one or more chemical or physical properties of the pad can include pad material hardness, thickness, surface grooving, pore size, porosity, Youngs modulus, compressibility, asperity, and the like.
Abstract:
Pad conditioners (15) and methods of conditioning pads for applications such as polishing substrates and chemical mechanical planarization of substrates are provided.
Abstract:
A material with a mesh of fibers and a binder material holding the fibers in the mesh can be used on a carrier head or a polishing pad. A polishing apparatus can include a pad cleaner with nozzles to direct jets of cleaning fluid onto the polishing pad and a brush to agitate a surface of the polishing pad.
Abstract:
A system, methods and mediums are provided for dynamic adjustment of sampling plans in connection with a wafer (or other device) to be measured. A sampling plan provides information on specific measure points within a die, a die being the section on the wafer that will eventually become a single chip after processing. There are specified points within the die that are candidates for measuring. The stored die map information may be retrieved and translated to determine the available points for measurement on the wafer. The invention adjusts the frequency and/or spatial resolution of measurements when one or more events occur that are likely to indicate an internal or external change affecting the manufacturing process or results. The increase in measurements and possible corresponding decrease in processing occur on an as-needed basis. The dynamic metrology plan adjusts the spatial resolution of sampling within-wafer by adding, subtracting or replacing candidate points from the sampling plan, in response to certain events which suggest that additional or different measurements of the wafer may be desirable. Where there are provided a number of candidate points in the die map in the area to which points are to be added, substracted, or replaced, the system can select among the points. Further, the invention may be used in connection with adjusting the frequency of wafer-to-wafer measurements.
Abstract:
A chemical mechanical polishing (CMP) system (200) is provided. A carrier (206) has a top surface and a bottom region. The top surface of the carrier is designed to hold and rotate a wafer (202) having a one or more formed layers to be prepared. A preparation head (208) is also included and is designed to be applied to at least a portion of the wafer (202) that is less than an entire portion of the surface of the wafer (202). Preferably, the preparation head (208) and the carrier (206) are configured to rotate in opposite directions. In addition, the preparation (208) head is further configured to oscillate while linearly moving from one of the direction of a center of the wafer (202) to an edge of the wafer (202) and from the edge of the wafer (202) to the center of the wafer(202). A support head (212) to support the top face of the wafer is also included, as well as a conditioning head (210).
Abstract:
The present invention provides an improved planarization apparatus for chemical mechanical planarization. In an exemplary embodiment, the invention provides an apparatus having a back support operatively coupled to the edge support, the bac support having at least one surface for supporting a back side of the object during planarization. The surface for supporting the back side provides a substantially friction free interface between the surface and the back side of the object to allow the object to move across the surface of the back support. In some embodiments, an edge support is movably coupled to an edge of an object for supporting and positioning the object during planarization.
Abstract:
A method for conditioning a polishing pad includes, pressing a conditioning surface of a conditioning pad comprising a first polymer against a polishing surface of the polishing pad comprising a second polymer, and producing relative motion between the pads such that measured characteristics of the polishing surface are changed.