US20180311784A1 - Cmp machine with improved throughput and process flexibility - Google Patents

Cmp machine with improved throughput and process flexibility Download PDF

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Publication number
US20180311784A1
US20180311784A1 US15/947,510 US201815947510A US2018311784A1 US 20180311784 A1 US20180311784 A1 US 20180311784A1 US 201815947510 A US201815947510 A US 201815947510A US 2018311784 A1 US2018311784 A1 US 2018311784A1
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Prior art keywords
carrier head
substrate
rotation
support
platen
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Abandoned
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US15/947,510
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English (en)
Inventor
Daniel Ray Trojan
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AXUS Tech LLC
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AXUS Tech LLC
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Priority to US15/947,510 priority Critical patent/US20180311784A1/en
Publication of US20180311784A1 publication Critical patent/US20180311784A1/en
Assigned to AXUS TECHNOLOGY, LLC reassignment AXUS TECHNOLOGY, LLC ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: TROJAN, Daniel Ray
Priority to US17/457,871 priority patent/US20220088744A1/en
Abandoned legal-status Critical Current

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
    • B24B37/00—Lapping machines or devices; Accessories
    • B24B37/34—Accessories
    • B24B37/345—Feeding, loading or unloading work specially adapted to lapping
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
    • B24B37/00—Lapping machines or devices; Accessories
    • B24B37/27—Work carriers
    • B24B37/30—Work carriers for single side lapping of plane surfaces
    • B24B37/32—Retaining rings
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
    • B24B27/00—Other grinding machines or devices
    • B24B27/0023—Other grinding machines or devices grinding machines with a plurality of working posts
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
    • B24B37/00—Lapping machines or devices; Accessories
    • B24B37/04—Lapping machines or devices; Accessories designed for working plane surfaces
    • B24B37/07—Lapping machines or devices; Accessories designed for working plane surfaces characterised by the movement of the work or lapping tool
    • B24B37/10—Lapping machines or devices; Accessories designed for working plane surfaces characterised by the movement of the work or lapping tool for single side lapping
    • B24B37/105—Lapping machines or devices; Accessories designed for working plane surfaces characterised by the movement of the work or lapping tool for single side lapping the workpieces or work carriers being actively moved by a drive, e.g. in a combined rotary and translatory movement
    • B24B37/107—Lapping machines or devices; Accessories designed for working plane surfaces characterised by the movement of the work or lapping tool for single side lapping the workpieces or work carriers being actively moved by a drive, e.g. in a combined rotary and translatory movement in a rotary movement only, about an axis being stationary during lapping
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
    • B24B37/00—Lapping machines or devices; Accessories
    • B24B37/27—Work carriers
    • B24B37/30—Work carriers for single side lapping of plane surfaces
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
    • B24B51/00—Arrangements for automatic control of a series of individual steps in grinding a workpiece

Definitions

  • the disclosed technology relates to semiconductor processing equipment, and more specifically, a chemical mechanical planarization (CMP) system and apparatus with a reduced footprint and operational capabilities that allow for handling and manipulation of objects in a condensed space.
  • CMP chemical mechanical planarization
  • CMP machines are widely used in the semiconductor manufacturing industry.
  • An objective of the disclosed technology is to provide an improved chemical mechanical planarization (CMP) apparatus with a reduced footprint and increased throughput and functionality.
  • CMP chemical mechanical planarization
  • a substrate carrier head system comprising a support, wherein an axis of rotation extends through the support, at least one elongated member comprising a first portion and a second portion opposed to the first portion, wherein the first portion is configured to rotatably connect to the support and pivot the elongated member about the axis of rotation relative to the support through an angle of rotation that is at least about 270 degrees in a single direction, and a carrier head configured to connect to the second portion and to hold and process a substrate.
  • the angle of rotation is substantially unrestricted in a single direction.
  • the carrier head comprises a membrane configured to be pressurized, to allow a substrate to contact and be processed by a polishing pad on a platen.
  • a controller configured to cause the carrier head to move the substrate from a first position allowing a first process to be performed on the substrate on a first platen, to a second position allowing a second process to be performed on the substrate on a second platen.
  • the first and second processes are different.
  • the first process is a bulk removal process and the second process is a fine removal process.
  • a substrate carrier head system comprising at least one support, wherein a first axis of rotation extends through the support, at least one elongated member comprising a first link having a first portion and a second portion opposed to the first portion, wherein the first portion is configured to rotatably connect to the support and pivot the first link about the first axis of rotation relative to the support through a first angle of rotation, and wherein a second axis of rotation extends through the second portion, the first and the second axes of rotation approximately parallel with respect to each other, a second link having a third portion and a fourth portion opposed to the third portion, wherein the third portion is configured to rotatably connect to the second portion and pivot the second link relative to the first link about the second axis of rotation through a second angle of rotation, and a carrier head configured to connect to the fourth portion and to hold and process a substrate.
  • the first angle of rotation is at least about 270 degrees in a single direction.
  • the carrier head is configured to provide pressure against a substrate to allow the substrate to be processed by a platen.
  • the system is configured to move the carrier head linearly toward a center of a platen based at least in part on a synchronized rotation of the first link and the second link.
  • the system further comprises at least one platen configured to process a substrate held by the carrier head.
  • At least two substrate carrier head systems according to an embodiment is disclosed, where each system further comprises at least two elongated members and at least two carrier heads, and at least two platens configured to process at least four substrates handled by each carrier head, wherein the first angle of rotation is at least about 270 degrees in a single direction.
  • a second platen wherein the at least one elongated member is configured to move the substrate from a first position allowing a first process to be performed on the substrate on the first platen, to a second position allowing a second process to be performed on the substrate on the second platen.
  • a chemical mechanical planarization apparatus comprising at least a first substrate carrier head system and a second substrate carrier head system, each carrier head system comprising a support, wherein an axis of rotation extends through the support, at least one elongated member comprising a first portion and a second portion opposed to the first portion, wherein the first portion is configured to rotatably connect to the support and pivot the elongated member about the axis of rotation relative to the support through an angle of rotation, and a carrier head configured to connect to the second portion and to hold and process a substrate; and at least one platen configured to process a first substrate held by the first carrier head system and a second substrate held by the second carrier head system.
  • the angle of rotation is at least about 270 degrees in a single direction.
  • angle of rotation is substantially unrestricted in a single direction.
  • a controller configured to cause the first carrier head system to move a first substrate from a first position for performing a first process on the first substrate on a first platen to a second position for performing a second process on a second substrate on a second platen.
  • the first and second processes are different.
  • the controller configured to place the first substrate carrier head system in an offline state while the second substrate carrier head system remains in a processing state.
  • the controller is configured to cause the first or second carrier head system to replace a polishing pad of the at least one platen.
  • FIG. 1A is a plan view of a chemical mechanical planarization (CMP) system, according to embodiments of the disclosed technology.
  • CMP chemical mechanical planarization
  • FIG. 1B is a side view of a CMP system, according to embodiments of the disclosed technology.
  • FIG. 2 is a cross-sectional view of an example carrier head assembly of a CMP system.
  • FIG. 3A and 3B are plan views of a CMP apparatus including links, according to embodiments of the disclosed technology.
  • FIG. 4 is a plan view of a CMP system including a platen, according to embodiments of the disclosed technology.
  • FIG. 5 is an isometric view of an example CMP system, according to embodiments of the disclosed technology.
  • FIG. 6 is a flowchart illustrating an example method for operating a CMP system, according to embodiments of the disclosed technology.
  • the disclosed technology relates to a CMP machine with a reduced footprint over that of a typical CMP machine and has operational capabilities that allows the machine to handle and manipulate wafer objects in a condensed space.
  • the disclosed technology is also related to a CMP machine with articulable arms with elbow joints and shoulders connected to a support.
  • the disclosed technology is also related to a CMP machine with the operational capabilities to polish two or more wafers on a single polishing platen as part of a staggered process such that the critical period of time for polishing a wafer is not interrupted or disrupted by the polishing of subsequent wafers.
  • the disclosed technology is also related to improved offline consumables preparation by providing a system where platen pads may be efficiently removed and replaced with pre-conditioned platen pads without causing down time of the machine as it relates to utilizing other platens within the system.
  • machines which have reduced throughput due to having to perform wafer handling and loading/unloading sequentially with processing steps include machines which can process only a single wafer per platen, machines which require wafer carrier(s) to move concurrently between polishing platens with all other heads due to being fixably coupled to one another, machines where one platen cannot be utilized while wafer carrier(s) are waiting for process and/or wafer loading/unloading operations to be completed on other heads and/or platens, and machines which require transferring a wafer from one wafer carrier to another in order to process the wafer between multiple platens.
  • CMP chemical mechanical polishing
  • Integrated circuits are manufactured with multiple layers and alternating layers of conducting materials (copper, tungsten, aluminium, etc.), insulating layers (silicon dioxide, silicon nitride, etc.), and semiconducting material (polysilicon). A successive combination of these layers is sequentially applied to the wafer surface, but because of the implanted devices on the surface, topographical undulations are built up upon the device structures, as is the case with silicon dioxide insulator layers. These unwanted topographical undulations must be flattened or “planarized” before the next layer can be deposited. In the case of copper layers, the copper is deposited on the surface to fill contact vias and make effective vertical paths for the transfer of electrons from device to device and from layer to layer.
  • the CMP process is an enabling technology in the manufacture of multi-layer circuitry that makes this all possible.
  • a CMP process, system and apparatus is
  • FIG. 1A is a plan view illustrating an embodiment of a chemical mechanical planarization (CMP) system 100 including a support 102 (e.g., body, column, base, polish arm support, etc.), an arm 104 (e.g., elongated member or polish arm), and a carrier head 106 .
  • the arm 104 attaches to support 102 and has a carrier head 106 attached.
  • CMP system 100 may also include a means for rotating the arm attachments (not shown) as further discussed below.
  • the support 102 is a structural support that is configured to hold the arm 104 and carrier head 106 in place above one or more polishing platens (shown in FIGS. 4 and 5 ).
  • the support 102 is configured to rotate the arm 104 that is rotatably attached to support 102 .
  • the support 102 or portions thereof may rotate such that arm 104 attached to support 102 rotates about support 102 .
  • support 102 may be configured to be stationary while arm 104 attached to support 102 rotates about support 102 .
  • FIG. 1B is a side view of CMP system 100 .
  • support 102 is configured to provide electrical and fluid connections to the rest of the CMP system 100 .
  • support 102 has electrical/electromechanical connections and fluid connections disposed within support 102 and/or along the outer periphery of support 102 .
  • the electrical connections are configured to transmit power and electrical signals to one or more components of the CMP system 100 and receive electrical signals as feedback from the CMP system 100 .
  • CMP system 100 may have wiring, such as Ethernet connections and electrical slip ring assemblies that can be fed through the bottom of support 102 and up to various components of the CMP system 100 .
  • fluid connections can be included, and configured to provide various fluids to the CMP system 100 (e.g., CMP slurry).
  • the fluid connections can provide pneumatic pressure and vacuum force to the system.
  • the CMP system 100 can be configured to rotate about an axis of rotation.
  • support 102 includes means for rotating arm 104 about an axis of rotation.
  • Support 102 may include, for example, an electric motor (e.g., stepper motor, brushless motor, torque motor, etc.), mechanical gears, magnetic or rotational couplings or any other means for producing rotational motion on the arm 104 or support 102 .
  • an electric motor e.g., stepper motor, brushless motor, torque motor, etc.
  • mechanical gears e.g., magnetic or rotational couplings or any other means for producing rotational motion on the arm 104 or support 102 .
  • the axis of rotation passes through support 102 .
  • the degree of rotation is indicated by the ⁇ symbol in FIG. 1A .
  • the direction of rotation may be in either direction (clockwise or counterclockwise).
  • the arm 104 and carrier head 106 may rotate about the axis of rotation (i.e., wind or unwind) at least about 270° in a single direction (i.e., angular displacement of ⁇ 270°.
  • the rotation of arm 104 about the axis of rotation may be continuous (i.e., unrestricted), and thus, CMP system 100 can have an angular displacement of 360° or more (i.e., ⁇ 2 ⁇ radians).
  • carrier head 106 attached to the arm can actuate in a downward (i.e., lowered) and upward (i.e., raised) direction. Accordingly, carrier head 106 can lower or raise based on the desired configuration for CMP processing. For example, in a raised configuration, carrier head 106 or arm 104 may receive a control signal commanding carrier head 106 to lower. Carrier head 106 may lower until it presses against a polishing pad of a platen (not shown). For example, carrier head 106 may press a wafer held beneath the undercarriage of carrier head 106 against the polishing pad.
  • FIG. 2 is a cross-sectional view of carrier head 106 .
  • Carrier head 106 can include a membrane assembly 205 and a support base 280 to which the membrane assembly 205 is mounted.
  • the support base 280 can be any suitable configuration configured to provide support to the membrane assembly.
  • the support base 280 can attach and interface the remainder of the carrier assembly 106 with CMP system 100 .
  • the membrane assembly 205 may include a support plate 210 , a resilient membrane 220 , a membrane clamp 230 , and an outer pressure ring 240 , as shown.
  • the support plate 210 can be any suitable configuration to attach membrane assembly 205 to support base 280 .
  • the support plate 210 may be mounted to the support base 280 using one or more bolts or other suitable attachment elements.
  • the support plate 210 may be mounted to the support base 280 at various locations, such as along the outer perimeter of the support base 280 .
  • the support plate 210 can be any suitable configuration to support the resilient membrane 220 .
  • the resilient membrane 220 may be secured to the support plate 210 in a number of different ways.
  • the resilient membrane 220 may be secured to the support plate 210 before or after the support plate 210 is secured to the support base 280 .
  • the resilient membrane 220 may be secured to the support plate 210 through use of any of a number of suitable different holding elements, such as the membrane clamp 230 .
  • the membrane clamp 230 may be spring loaded.
  • the membrane clamp 230 may tighten securely through the use of a fastening mechanism (e.g., nuts and bolts, etc.).
  • the resilient membrane 220 can be secured to the support plate 210 such that the membrane 220 can hold a wafer 270 against a polishing pad and process the wafer, for example, as described above with reference to FIG. 1B .
  • substrate and “wafer” are used interchangeably herein, and include, for example, semiconductor or silicon wafers, flat panel displays, glass plates or disks, plastic work-pieces, and other substantially rigid, flat and thin work-pieces of various shapes (e.g., round, square rectangular, etc.) and sizes on which one or more embodiments of the apparatuses and processes disclosed herein can be implemented.
  • the membrane 220 can be sufficiently resilient and flexible, such that in combination with the polishing pad materials and process parameters, wafer breakage is reduced.
  • the membrane 220 and support plate 210 can be configured to allow gas pressure between the membrane 220 and support plate 210 , and press the membrane 220 against the wafer 270 during CMP processing. For example, a substantial seal can be formed between the membrane 220 and plate 210 .
  • the support plate 210 can be spaced from the membrane 220 , to form a gap or cavity 260 therebetween.
  • the cavity 260 can be formed when the membrane 220 is in a quiescent (e.g., non-pressurized) state.
  • the membrane 220 rests upon or proximate to the plate 210 when the membrane 220 is in a quiescent state, and the cavity 260 is formed when the membrane 220 is expanded (e.g., pressurized).
  • the cavity 260 can redistribute and account for variations in the gas pressure against the membrane 220 , and thus, against the wafer 270 , during planarization.
  • the gas pressure can be provided to the backside of the membrane 220 through a pneumatic channel 250 , as shown.
  • the pneumatic channel 250 may be disposed within the support plate 210 , or can supply gas through other configurations.
  • the pneumatic channel 250 may be modified differently depending on the application (e.g., a circular tube, a square tube, etc.).
  • the pneumatic channel may provide vacuum for retaining a wafer 270 to the underside of the membrane assembly.
  • the membrane 220 may include holes, to either provide such vacuum, and/or allow for positive pressure to disengage the wafer 270 from the membrane 220 .
  • the cavity 260 can be formed by spacing the membrane 220 from the support plate 210 .
  • the support plate 210 can included a recessed inner portion to form a cavity.
  • the membrane assembly 205 can include an outer pressure ring 240 to form the cavity 260 .
  • the membrane assembly may be assembled without pressure rings.
  • the membrane 220 may rest directly against the support plate 210 without a cavity 260 separating the membrane 220 from the support plate 210 .
  • the membrane assembly may include one or more pressure rings 240 arranged in concentric circles.
  • the membrane 220 used may be a multi-zoned membrane.
  • the membrane 220 may have grooves (e.g., indentations) and/or raised portions of the membrane 220 that effectively segregate various zones of the membrane 220 .
  • the grooves may be arranged in a series of concentric circles originating from the center of the membrane.
  • the grooves and raise portions may be irregularly shaped (e.g., interconnecting circles, non-circular indentations, circular patterns scattered across the surface of the membrane) in order to improve distribution of pressure applied across the wafer 370 when attached to the membrane assembly.
  • the membrane 220 may be flexible such that it conforms to a structure that it surrounds. In some instances, the membrane 220 may be convex. For example, the membrane 220 may sag in the center. The membrane 220 may even be shaped like a cone such that a small area of the membrane 220 would be in contact with the wafer surface for finer precision polishing.
  • the membrane material may be any resilient material suitable for planarization, as described herein, and for use, for example, within a carrier head for a CMP process.
  • the membrane material may be one of rubber or a synthetic rubber material.
  • the membrane material may also be one of Ethylene propylene diene monomer (M-class) (EPDM) rubber or silicone.
  • EPDM Ethylene propylene diene monomer
  • it may be one or more combinations of vinyl, rubber, silicone rubber, synthetic rubber, nitrile, thermoplastic elastomer, fluorelastomers, hydrated acrylonitrile butadiene rubber, or urethane and polyurethane formas.
  • One or more membrane assemblies can be implemented within a single CMP system.
  • the CMP system may have controls utilizing feedback from the system while operating to more accurately control the CMP process (e.g., variable speed motor controls, etc.).
  • the arm or arms of the CMP system can bend or rotate about a second axis of rotation such that the carrier head can tuck inward, toward the support and/or outward, away from the support.
  • the elongated arm may comprise multiple links that may all rotate about various axes of rotation (i.e., an articulating or jointed arm).
  • FIGS. 3A and 3B illustrate plan views of a chemical mechanical planarization (CMP) system 300 embodiment including links 304 and 306 .
  • CMP system 300 is substantially similar to CMP system 100 described in FIGS. 1A-1B and 2 .
  • CMP system 300 is different in that the arm or arms can bend or rotate about a second axis of rotation such that carrier head 308 can tuck inward, toward the support, as shown in FIG. 3B , or outward, away from the support in the opposite direction, as shown in FIG. 3A .
  • CMP system 300 may include a first link 304 attached to the support 302 , a second link 306 attached to the first link 304 , and a carrier head 308 attached to the second link 306 .
  • the links may be joined at a center joint (i.e., an elbow).
  • first link 304 is rotatably attached to support 302 and defines a first axis of rotation that passes through support 302 .
  • first link 304 may be rotatably attached to second link 306 defining a second axis of rotation through the area of attachment between links.
  • first link 304 may not be configured to rotate where only the second link 306 is configured to rotate about the second axis of rotation.
  • the attachment section includes means for rotating the second link about the second axis of rotation, including similar features as described with reference to FIGS. 1A-1B . Electrical and fluid connections can likewise be included throughout the links as described with reference to FIGS. 1A-1B .
  • the links including the first link 304 and/or the second link 306 , may be configured to rotate about their respective axes of rotation (i.e., first axis of rotation, second axis of rotation, etc.).
  • second link 306 may be configured to rotate about the second axis of rotation that passes through the link attachment section.
  • the second link 306 may be configured to rotate about the second axis of rotation such that second link 306 extends outward to create a straight line with the other link and the first axis of rotation.
  • second link 306 may rotate between 0° to 180° and between 180° to 270° and between 270° and 360° about the second axis of rotation.
  • second link 306 may rotate about the second axis of rotation in a substantially unrestricted manner.
  • the links may rotate independently of other links in the link chain and independent of support 302 .
  • certain links may be coupled together such that their movement is dependent on another link's movement or the movement of support 302 .
  • one or more links and support 302 may be coupled together by rotary gears or magnets such that when the support or another link rotates, the links or support that are coupled together also move.
  • the CMP system may comprise multiple supports with one or more arms attached to each support.
  • each support may have two arms.
  • each arm may be comprised of links as discussed with reference to FIGS. 3A-3B .
  • multiple platens may be configured in proximity to each support.
  • two platens may be located between two supports such that each carrier head of the two supports can access each platen for CMP processing.
  • a single platen may be configured in proximity to two supports where each carrier head is configured to access the platen for processing, as shown in FIG. 4 .
  • wafers are presented to a prescribed load station (not shown) and prepared for loading onto carrier head 308 . Wafer transfer from the Equipment Front End Module (EFEM) to the load/unload stations is accomplished via an overhead gantry robot mechanism, for example.
  • EFEM Equipment Front End Module
  • Carrier head 308 is positioned concentrically and overhead of loading/unloading station (not shown), and the wafer is transferred from the station to the carrier head 106 .
  • loading/unloading station not shown
  • a person of ordinary skill in the art would understand the various methods and means for loading and unloading a wafer onto a carrier head.
  • Carrier head 308 is positioned as shown over a platen to perform the polishing process. While the polishing process proceeds, a next wafer can be placed onto loading/unloading station (not shown) for subsequent processing.
  • the links 304 and 306 supporting carrier 308 and the elbow (i.e., joint) between links can articulate such that carrier head 308 “tucks in” toward support 302 (as shown by the progression from FIG. 3A to FIG. 3B ), allowing rotation of the carrier about the support 302 within a smaller space envelope than would be possible if untucked instead. As such, this allows the positioning of carrier head 308 concentrically and overhead of the unloading station.
  • Carrier head 308 can then rotationally be positioned back to the position for transferring a subsequent wafer to carrier 308 from a load station, which can then be positioned for processing over a platen.
  • the processed wafer may then be unloaded onto an unloading station and retrieved by a transfer robot for return to the EFEM or, more commonly, to a cleaning system.
  • this same sequence can be applied to the corresponding set of components located symmetrically opposite a platen, such that carrier 308 is processing on a platen while wafers are being loaded onto or unloaded from a second carrier head using additional loading and unloading stations.
  • FIG. 4 illustrates an example embodiment of a CMP system 400 , similar to CMP systems 300 and 100 previously described, including a platen 414 that is configured to process a substrate held by each of carrier heads 410 and 412 .
  • arms 406 and 408 are substantially similar to arm 104 .
  • arms 406 and 408 may comprise links such as links 304 and 306 described with reference to FIGS. 3A-3B .
  • carrier heads 410 and 412 may be substantially similar to carrier heads 106 or 308
  • supports 404 and 402 may be substantially similar to supports 102 or 302 .
  • platen 414 can be configured in any number of shapes (e.g., circular, square, etc.) and as such, will have a center. In the example of FIG. 4 , platen 414 is a circle having a center 416 . Additionally, CMP system 400 can be configured with any number of platens where, for example, each platen or pair of adjacent platens have a number of corresponding supports.
  • each of the arms 406 and 408 can rotate about their respective axes of rotation that pass through each of the supports 402 and 404 .
  • each arm may be configured to rotate about their respective axes of rotation with an angular displacement of 270° or more.
  • arm 406 and/or 402 may be configured to rotate about their respective axes of rotation in a substantially unrestricted manner.
  • CMP system 400 may include one or more stations for loading and/or unloading a wafer object to and from one or more carrier heads.
  • each carrier head may have a dedicated load station and/or unload station for loading wafers onto the carrier head or unloading a wafer from the carrier head.
  • Two or more carrier heads may have a common load/unload station relative to each other, for processing on the same, or different platens.
  • each station may be placed at approximately the same radial distance from each of supports 404 and 402 .
  • each station may be located at different radial distances from each of supports 404 and 402 .
  • Each station may be placed at the same or different radial distances from a support, relative to other station(s).
  • one or more arms of FIG. 4 comprises links
  • the arms may articulate to reach various configurations of the various stations, with greater flexibility in different configurations and locations of the various supports.
  • the two or more wafers may be loaded onto carrier heads 410 and 412 .
  • Loading may be done at a loading station (not shown).
  • Both carrier heads 410 and 412 may be positioned over platen 414 (as shown), such that both wafers may be processed substantially concurrently.
  • carrier heads may alternate or stagger processing of their respective wafers.
  • carrier head 410 may process a first wafer on platen 414 for a specified amount of time or for a specific percentage of the overall process.
  • carrier head 412 may be configured in a raised position such that carrier head 412 does not press against platen 412 until it receives a control signal to lower its head and process the second wafer against platen 412 .
  • carrier head 410 When carrier head 412 receives the control signal to lower its head, carrier head 410 can receive a control signal to raise its head such that the first wafer is no longer being processed. Alternatively, carrier head 410 may remain with its head down such that both carrier heads are processed concurrently.
  • FIG. 5 illustrates CMP apparatus 500 including a first CMP system 520 and a second CMP system 530 .
  • each CMP system includes two arms comprising links and two platens. Accordingly, each platen is configured to process one or more wafers from each of the CMP systems.
  • CMP systems 520 and 530 have two arms with links. Although the CMP systems 520 and 530 of FIG. 5 are shown with the arms comprising links, it is to be understood that the system can be configured with one or more of the arms having no links as described with reference to FIGS. 1 and 4 . In addition, CMP systems 520 and 530 can have any number of arms extending from their respective supports. Furthermore, CMP apparatus 500 can have any number of platens. In some embodiments, the two arms attached to a single support can both rotate in the same direction as each other at substantially the same time about a common axis of rotation such that they change positions with one another.
  • CMP systems 520 and 530 may be equipped with a controller 510 as shown.
  • the controller 510 may be located within the CMP system (e.g., within a support of CMP system 520 and/or 530 ).
  • controller 510 can be an electronic controller, mechanical, pneumatic or a combination.
  • any of the apparatus and systems described herein can include a controller (e.g., controller 510 , FIG. 5 ) which can be configured to provide the functionality of the methods described herein, and additional functionality.
  • any of the apparatus and systems described herein can include a devices for tracking direction and angular displacement of the CMP carrier heads (e.g., an absolute encoder, etc.).
  • any of the apparatus and systems described herein can include platens with polishing pads that are configured to rotate or spin.
  • any of the apparatus and systems described herein can include carrier heads that are configured to rotate or spin. For example, a carrier head holding a wafer may spin the wafer while processing the wafer against a spinning platen.
  • the wafer carriers described above which attach to the outer portion of the outer links (or arms if there are no links), provide pressure to the wafer being processed.
  • the wafer carrier heads can lower toward the platen and rise up away from the platen depending on the desired operation.
  • Wafer carrier is also configured to support loading and unloading operations of wafers before and after CMP processing.
  • the carrier head is also configured to move linearly (or radially if the platen is a circle) in towards center of the platen (as described above with respect to center 416 ) due to a synchronized rotational motion of both links.
  • the carrier head can press a wafer against an area of the platen.
  • the controller may then command both links to rotate in a synchronized motion such that the wafer is moved toward the center of the platen.
  • the carrier head is further configured to oscillate inward and outward along the line or radius.
  • each platen may include a pad conditioner system (shown but not numbered).
  • the pad conditioner can sweep across the entire polishing platen or any portion thereof.
  • a pad conditioner can be configured to condition the pad before, during and/or after polishing a wafer.
  • the CMP controller may be further configured, in system with at least two CMP carrier head systems, to control either carrier head system to replace a polishing pad (e.g., a consumable) of a first platen.
  • a second carrier head system may continue to process wafers on a second platen while the first platen is temporarily offline.
  • a polishing pad may be prepared or pre-conditioned off-line (i.e., remote from the CMP processing station).
  • the controller may place the first carrier head system in an offline state (e.g., in a state where the first carrier head is not processing wafers, for example, in a maintenance or repair mode).
  • the second carrier head system may continue in a processing state.
  • the controller may command the first carrier head system to attach the pre-conditioned polishing pad to the system.
  • this attachment would require removing the carrier head such that the pre-conditioned polishing pad may be attached in its place.
  • a separate attachment may need to be installed in place of the carrier head such that the pre-conditioned polishing pad can attach to the separate attachment.
  • the CMP system 500 may be configured to advantageously stagger the processing of multiple wafers on multiple platens.
  • CMP system may include a first carrier head system and a second carrier head system where each system has a first arm and a second arm.
  • each arm has a carrier head attached at one end.
  • the first carrier head system may process a first wafer on a first platen with a first arm while the second carrier head system processes a second wafer on a second platen with a second arm.
  • the first arm can rotate to move the first wafer to the second platen for a second CMP process.
  • the first and second CMP processes are different.
  • the first process may be a bulk removal process whereas the second process may be a fine removal process, in which the bulk removal process removes more material from a wafer than the fine removal process.
  • the bulk removal process removes 80%, and the fine removal process removes 20%, of the total material removed from the wafer for the overall process.
  • the second wafer may continue to be processed at the second platen.
  • a third wafer can be loaded using the second arm of the first carrier head system and processed on the first platen once the first wafer has been removed, and the process can repeat itself for subsequent wafer processing.
  • FIG. 6 is a flowchart illustrating an example method 600 for operating a CMP system in accordance with certain embodiments disclosed herein.
  • method 600 may be performed by the system 100 of FIGS. 1A-1B .
  • method 600 may be performed by the system 300 of FIGS. 3A-3B .
  • method 600 may be performed by the system 400 of FIG. 4 .
  • method 600 may be performed by the system 500 of FIG. 5 , or other systems.
  • a CMP system for processing a wafer.
  • the CMP system includes an elongated arm rotatably attached to a support.
  • the arm is rotated from a first position to a second position. The rotation from the first position to the second position results in an angular displacement of more than 270°.
  • the present disclosure results in high throughput for processing a single wafer on a single platen by enabling concurrent processing of one wafer while loading and unloading of a sequential wafer, with both wafers being processed on the same platen sequentially.
  • the present disclosure results in high throughput for processing two wafers on a single platen by enabling concurrently the processing of two wafers while loading and unloading of sequential wafers, with both wafers being processed on the same platen.
  • the disclosed technology is configured to result in a duty cycle of approximately 100% for the overall system. For example, the system may experience little to no down time with respect to processing wafers as a result of the configurations and embodiments described herein.
  • the disclosed technology is configured to result in a reduced footprint for each CMP system (i.e., the support and arm(s)) and the overall system as a whole.
  • Conditional language such as, among others, “can,” “could,” “might,” or “may,” unless specifically stated otherwise, or otherwise understood within the context as used, is generally intended to convey that certain embodiments include, while other embodiments do not include, certain features, elements, and/or steps. Thus, such conditional language is not generally intended to imply that features, elements and/or steps are in any way required for one or more embodiments or that one or more embodiments necessarily include logic for deciding, with or without user input or prompting, whether these features, elements and/or steps are included or are to be performed in any particular embodiment.
  • top, bottom, over, under and the like in the description and the claims are used for descriptive purposes and not necessarily for describing relative positions. The terms so used are interchangeable under appropriate circumstances and the embodiments of the disclosure described herein can operate in other orientations than described or illustrated herein.
  • a general-purpose computer comprising one or more processors should not be interpreted as excluding other computer components, and may possibly include such components as memory, input/output devices, and/or network interfaces, among others.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Finish Polishing, Edge Sharpening, And Grinding By Specific Grinding Devices (AREA)
  • Mechanical Treatment Of Semiconductor (AREA)
  • Constituent Portions Of Griding Lathes, Driving, Sensing And Control (AREA)
  • Container, Conveyance, Adherence, Positioning, Of Wafer (AREA)
US15/947,510 2017-04-26 2018-04-06 Cmp machine with improved throughput and process flexibility Abandoned US20180311784A1 (en)

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US201762602538P 2017-04-26 2017-04-26
US15/947,510 US20180311784A1 (en) 2017-04-26 2018-04-06 Cmp machine with improved throughput and process flexibility

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JP2024026436A (ja) 2024-02-28
JP2020518475A (ja) 2020-06-25
JP7408726B2 (ja) 2024-01-05
JP2022141653A (ja) 2022-09-29
KR20200002928A (ko) 2020-01-08
WO2018200165A1 (en) 2018-11-01
EP3616237A1 (en) 2020-03-04
US20220088744A1 (en) 2022-03-24
JP7094983B2 (ja) 2022-07-04
EP3616237A4 (en) 2020-12-16

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