EP1522090A2 - Systeme de traitement thermique et chambre verticale configurable - Google Patents

Systeme de traitement thermique et chambre verticale configurable

Info

Publication number
EP1522090A2
EP1522090A2 EP03764437A EP03764437A EP1522090A2 EP 1522090 A2 EP1522090 A2 EP 1522090A2 EP 03764437 A EP03764437 A EP 03764437A EP 03764437 A EP03764437 A EP 03764437A EP 1522090 A2 EP1522090 A2 EP 1522090A2
Authority
EP
European Patent Office
Prior art keywords
process chamber
substrates
carrier
pedestal
injector
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP03764437A
Other languages
German (de)
English (en)
Other versions
EP1522090A4 (fr
Inventor
Dale R. Dubois
Jamie H. Nam
Craig Wildman
Taiquing Qiu
Jeffrey M. Kowalski
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Aviza Technology Inc
Original Assignee
Aviza Technology Inc
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Aviza Technology Inc filed Critical Aviza Technology Inc
Publication of EP1522090A2 publication Critical patent/EP1522090A2/fr
Publication of EP1522090A4 publication Critical patent/EP1522090A4/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C16/00—Chemical coating by decomposition of gaseous compounds, without leaving reaction products of surface material in the coating, i.e. chemical vapour deposition [CVD] processes
    • C23C16/44—Chemical coating by decomposition of gaseous compounds, without leaving reaction products of surface material in the coating, i.e. chemical vapour deposition [CVD] processes characterised by the method of coating
    • C23C16/46—Chemical coating by decomposition of gaseous compounds, without leaving reaction products of surface material in the coating, i.e. chemical vapour deposition [CVD] processes characterised by the method of coating characterised by the method used for heating the substrate
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C16/00—Chemical coating by decomposition of gaseous compounds, without leaving reaction products of surface material in the coating, i.e. chemical vapour deposition [CVD] processes
    • C23C16/44—Chemical coating by decomposition of gaseous compounds, without leaving reaction products of surface material in the coating, i.e. chemical vapour deposition [CVD] processes characterised by the method of coating
    • C23C16/4401—Means for minimising impurities, e.g. dust, moisture or residual gas, in the reaction chamber
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C16/00—Chemical coating by decomposition of gaseous compounds, without leaving reaction products of surface material in the coating, i.e. chemical vapour deposition [CVD] processes
    • C23C16/44—Chemical coating by decomposition of gaseous compounds, without leaving reaction products of surface material in the coating, i.e. chemical vapour deposition [CVD] processes characterised by the method of coating
    • C23C16/4401—Means for minimising impurities, e.g. dust, moisture or residual gas, in the reaction chamber
    • C23C16/4409—Means for minimising impurities, e.g. dust, moisture or residual gas, in the reaction chamber characterised by sealing means
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C16/00—Chemical coating by decomposition of gaseous compounds, without leaving reaction products of surface material in the coating, i.e. chemical vapour deposition [CVD] processes
    • C23C16/44—Chemical coating by decomposition of gaseous compounds, without leaving reaction products of surface material in the coating, i.e. chemical vapour deposition [CVD] processes characterised by the method of coating
    • C23C16/4412—Details relating to the exhausts, e.g. pumps, filters, scrubbers, particle traps
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C16/00—Chemical coating by decomposition of gaseous compounds, without leaving reaction products of surface material in the coating, i.e. chemical vapour deposition [CVD] processes
    • C23C16/44—Chemical coating by decomposition of gaseous compounds, without leaving reaction products of surface material in the coating, i.e. chemical vapour deposition [CVD] processes characterised by the method of coating
    • C23C16/455—Chemical coating by decomposition of gaseous compounds, without leaving reaction products of surface material in the coating, i.e. chemical vapour deposition [CVD] processes characterised by the method of coating characterised by the method used for introducing gases into reaction chamber or for modifying gas flows in reaction chamber
    • C23C16/45563—Gas nozzles
    • C23C16/45578—Elongated nozzles, tubes with holes
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C16/00—Chemical coating by decomposition of gaseous compounds, without leaving reaction products of surface material in the coating, i.e. chemical vapour deposition [CVD] processes
    • C23C16/44—Chemical coating by decomposition of gaseous compounds, without leaving reaction products of surface material in the coating, i.e. chemical vapour deposition [CVD] processes characterised by the method of coating
    • C23C16/54—Apparatus specially adapted for continuous coating
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L21/00—Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
    • H01L21/67—Apparatus specially adapted for handling semiconductor or electric solid state devices during manufacture or treatment thereof; Apparatus specially adapted for handling wafers during manufacture or treatment of semiconductor or electric solid state devices or components ; Apparatus not specifically provided for elsewhere
    • H01L21/67005—Apparatus not specifically provided for elsewhere
    • H01L21/67011—Apparatus for manufacture or treatment
    • H01L21/67017—Apparatus for fluid treatment
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L21/00—Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
    • H01L21/67—Apparatus specially adapted for handling semiconductor or electric solid state devices during manufacture or treatment thereof; Apparatus specially adapted for handling wafers during manufacture or treatment of semiconductor or electric solid state devices or components ; Apparatus not specifically provided for elsewhere
    • H01L21/67005—Apparatus not specifically provided for elsewhere
    • H01L21/67011—Apparatus for manufacture or treatment
    • H01L21/67098—Apparatus for thermal treatment
    • H01L21/67109—Apparatus for thermal treatment mainly by convection
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L21/00—Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
    • H01L21/67—Apparatus specially adapted for handling semiconductor or electric solid state devices during manufacture or treatment thereof; Apparatus specially adapted for handling wafers during manufacture or treatment of semiconductor or electric solid state devices or components ; Apparatus not specifically provided for elsewhere
    • H01L21/677—Apparatus specially adapted for handling semiconductor or electric solid state devices during manufacture or treatment thereof; Apparatus specially adapted for handling wafers during manufacture or treatment of semiconductor or electric solid state devices or components ; Apparatus not specifically provided for elsewhere for conveying, e.g. between different workstations
    • H01L21/67763—Apparatus specially adapted for handling semiconductor or electric solid state devices during manufacture or treatment thereof; Apparatus specially adapted for handling wafers during manufacture or treatment of semiconductor or electric solid state devices or components ; Apparatus not specifically provided for elsewhere for conveying, e.g. between different workstations the wafers being stored in a carrier, involving loading and unloading
    • H01L21/67772—Apparatus specially adapted for handling semiconductor or electric solid state devices during manufacture or treatment thereof; Apparatus specially adapted for handling wafers during manufacture or treatment of semiconductor or electric solid state devices or components ; Apparatus not specifically provided for elsewhere for conveying, e.g. between different workstations the wafers being stored in a carrier, involving loading and unloading involving removal of lid, door, cover
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L21/00—Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
    • H01L21/67—Apparatus specially adapted for handling semiconductor or electric solid state devices during manufacture or treatment thereof; Apparatus specially adapted for handling wafers during manufacture or treatment of semiconductor or electric solid state devices or components ; Apparatus not specifically provided for elsewhere
    • H01L21/677—Apparatus specially adapted for handling semiconductor or electric solid state devices during manufacture or treatment thereof; Apparatus specially adapted for handling wafers during manufacture or treatment of semiconductor or electric solid state devices or components ; Apparatus not specifically provided for elsewhere for conveying, e.g. between different workstations
    • H01L21/67763—Apparatus specially adapted for handling semiconductor or electric solid state devices during manufacture or treatment thereof; Apparatus specially adapted for handling wafers during manufacture or treatment of semiconductor or electric solid state devices or components ; Apparatus not specifically provided for elsewhere for conveying, e.g. between different workstations the wafers being stored in a carrier, involving loading and unloading
    • H01L21/67775—Docking arrangements

Definitions

  • the present invention relates generally to systems and methods for heat- treating objects, such as substrates. More specifically, the present invention relates to an apparatus and method for heat treating, annealing, and depositing layers of material on or removing layers of material from a semiconductor wafer or substrate.
  • Thermal processing apparatuses are commonly used in the manufacture of integrated circuits (ICs) or semiconductor devices from semiconductor substrates or wafers.
  • Thermal processing of semiconductor wafers include, for example, heat treating, annealing, diffusion or driving of dopant material, deposition or growth of layers of material, and etching or removal of material from the substrate.
  • These processes often call for the wafer to be heated to a temperature as high asl300°C and as low as 300°C before and during the process, and that one or more fluids, such as a process gas or reactant, be delivered to the wafer.
  • these processes typically require that the wafer be maintained at a uniform temperature throughout the process, despite variations in the temperature of the process gas or the rate at which it is introduced into the process chamber.
  • a conventional thermal processing apparatus typically consists of a voluminous process chamber positioned in or surrounded by a furnace. Substrates to be thermally processed are sealed in the process chamber, which is then heated by the furnace to a desired temperature at which the processing is performed. For many processes, such as Chemical Vapor Deposition (CVD), the sealed process chamber is first evacuated, and once the process chamber has reached the desired temperature a reactive or process gases are introduced to form or deposit reactant species on the substrates.
  • CVD Chemical Vapor Deposition
  • thermal processing apparatus typically and in particular vertical thermal processing apparatuses, required guard heaters disposed adjacent to sidewalls of the process chamber above and below the process zone in which product wafers were processed.
  • This arrangement is undesirable since it entails a larger chamber volume that must be pumped down, filled with process gas or vapor, and backfilled or purged, resulting in increased processing time.
  • this configuration takes up a tremendous amount of space and power due to a poor view factor of the wafers from the heaters.
  • Other problems with conventional thermal processing apparatuses include the considerable time required both before processing to ramp up the temperature of the process chamber and the wafer to be treated, and the time required after processing to ramp down the temperature.
  • a fundamental reason for the relatively long ramp up and ramp down times is the thermal mass of the process chamber and/or fumace in conventional thermal processing apparatuses, which must be heated or cooled prior to effectively heating or cooling the wafer.
  • a common approach to minimizing or offsetting this limitation on throughput of conventional thermal processing apparatus has been to increase the number of wafers capable of being processed in a single cycle or run.. Simultaneous processing of a large number of wafers helps to maximize the effective throughput of the apparatus by reducing the effective processing time on a per wafer basis.
  • this approach also increases the magnitude of the risk should something go wrong during processing. That is a larger number of wafers could be destroyed or damaged by a single failure, for example, if there was an equipment or process failure during a single processing cycle. This is particularly a concern with larger wafer sizes and more complex integrated circuits where a single wafer could be valued at from $1,000 to $10,000 depending on the stage of processing.
  • Another problem with this solution is that increasing the size of the process chamber to accommodate a larger number of wafers increases the thermal mass effects of the process chamber, thereby reducing the rate at which the wafer can be heated or cooled. Moreover, larger process chambers processing larger batches of wafers leads to or compounds a first-in-last-out syndrome in which the first wafers loaded into the chamber are also the last wafers removed, resulting in these wafers being exposed to elevated temperatures for longer periods and reducing uniformity across the batch of wafers.
  • RTP rapid thermal processing
  • Conventional RTP systems generally use high intensity lamps to selectively heat a single wafer or small number of wafers within a small, transparent, usually quartz, process chamber. RTP systems minimize or eliminate the thermal mass effects of the process chamber, and since the lamps have very low thermal mass, the wafer can be heated and cooled rapidly by instantly turning the lamps on or off.
  • Another problem with conventional RTP systems is their inability to provide uniform temperature distribution across multiple wafers within a single batch of wafers and even across a single wafer. There are several reasons for this non- uniform temperature distribution including (i) a poor view factor of one or more of the wafers by one or more of the lamps, and (ii) variation in output power from the lamps.
  • the present invention provides a solution to these and other problems, and offers other advantages over the prior art.
  • the present invention provides an apparatus and method for isothermally heating work pieces, such as semiconductor substrates or wafers, for performing processes such as annealing, diffusion or driving of dopant material, deposition or growth of layers of material, and etching or removal of material from the wafer.
  • a thermal processing apparatus for processing substrates held in a carrier at high or elevated temperatures.
  • the apparatus includes a process chamber having a top wall, a side wall and a bottom wall, and a heating source having a number of heating elements proximal to the top wall, the side wall and the bottom wall of the process chamber to provide an isothermal environment in a process zone in which the carrier is positioned to thermally process the substrates.
  • the dimensions of the process chamber are selected to enclose a volume substantially no larger than a volume necessary to accommodate the carrier, and the process zone extends substantially throughout the process chamber.
  • the process chamber has dimensions selected to enclose a volume substantially no larger than 125% of that necessary to accommodate the carrier.
  • the apparatus further includes a pumping system to evacuate the process chamber prior to processing pressure and a purge system to backfill the process chamber after processing is complete, and the dimensions of the process chamber are selected to provide both a rapid evacuation and a rapid backfilling of the process chamber.
  • the bottom wall of the process chamber includes a movable pedestal having at least one heating element therein, and the movable pedestal is adapted to be lowered and raised to enable the carrier with the substrates to be inserted into and removed from the process chamber.
  • the apparatus further includes a removable thermal shield adapted to be inserted between heating element in the pedestal and the substrates held the carrier. The thermal shield is adapted to reflect thermal energy from the heating element in the pedestal back to the pedestal, and to shield the substrates on the carrier from thermal energy from the heating element in the pedestal.
  • the apparatus further includes a shutter adapted to be moved into place above the carrier to isolate the process chamber when the pedestal is in a lowered position. Where the apparatus includes a pumping system to evacuate the process chamber, and the shutter can be adapted to seal with the process chamber, thereby enabling the pumping system to evacuate the process chamber when the pedestal is in the lowered position.
  • the apparatus further includes a magnetically coupled repositioning system that repositions the carrier during thermal processing of the substrates.
  • the mechanical energy used to reposition the carrier is magnetically coupled through the pedestal to the carrier without use of a movable feedthrough into the process chamber, and substantially without moving the heating element in the pedestal.
  • the magnetically coupled repositioning system is a magnetically coupled rotation system that rotates the carrier within the process zone during thermal processing of the substrates.
  • the apparatus further includes a liner separating the carrier from the top wall and the side wall of the process chamber, and a distributive or cross-flow injection system to direct flow of a fluid across surfaces of each of the substrates held in the carrier.
  • the cross-flow injection system generally includes a cross-flow injector having a number of injection ports positioned relative to substrates held in the carrier, and through which the fluid is introduced on one side of the number of substrates.
  • a number of exhaust ports in the liner positioned relative to the substrates held in the carrier cause the fluid to flow across the surfaces of the substrates.
  • Fluids introduced by the cross- flow injection system can include process gas or vapor, and inert purge gases or vapor used for purging or backfilling the chamber or for cooling the substrates therein.
  • FIG. 1 is a cross-sectional view of a thermal processing apparatus having a pedestal heater for providing an isothermal control volume according to an embodiment of the present invention, employing conventional up-flow configuration;
  • FIG. 2 is a perspective view of an alternative embodiment a base-plate useful in the thermal processing apparatus shown in FIG. 1 ;
  • FIG. 3 is a cross-sectional view of a portion of a thermal processing apparatus having a pedestal heater and a thermal shield according to an embodiment of the present invention
  • FIG. 4 is a diagrammatic illustration of the pedestal heater and thermal shield of FIG. 3 according to an embodiment of the present invention.
  • FIG. 5 is a diagrammatic illustration of an embodiment of the thermal shield having a top layer of material with a high absorptivity and a lower layer of material with a high reflectivity according to present invention
  • FIG. 6 is a diagrammatic illustration of another embodiment of the thermal shield having a cooling channel according to present invention.
  • FIG. 7 is a perspective view of an embodiment of a thermal shield and an actuator according to present invention.
  • FIG. 8 is a cross-sectional view of a portion of a thermal processing apparatus having a shutter according to an embodiment of the present invention
  • FIG. 9 is a cross-sectional view of a process chamber having a pedestal heater and a magnetically coupled wafer rotation system according to an embodiment of the present invention
  • FIG. 10 is a cross-sectional view of a thermal processing apparatus having a cross-flow injector system according to an embodiment of the present invention
  • FIG. 11 is a cross-sectional side view of a portion of the thermal processing apparatus of FIG. 10 showing positions of injector orifices in relation to the liner and of exhaust slots in relation to the wafers according to an embodiment of the present invention
  • FIG. 12 is a plan view of a portion of the thermal processing apparatus of FIG. 10 taken along the line A-A of FIG. 10 showing gas flow from orifices of a primary and a secondary injector across a wafer and to an exhaust port according to an embodiment of the present invention
  • FIG. 13 is a plan view of a portion of the thermal processing apparatus of
  • FIG. 10 taken along the line A-A of FIG. 10 showing gas flow from orifices of a primary and a secondary injector across a wafer and to an exhaust port according to another embodiment of the present invention
  • FIG. 14 is a plan view of a portion of the thermal processing apparatus of FIG. 10 taken along the line A-A of FIG. 10 showing gas flow from orifices of a primary and a secondary injector across a wafer and to an exhaust port according to yet another embodiment of the present invention;
  • FIG. 15 is a plan view of a portion of the thermal processing apparatus of FIG. 10 taken along the line A-A of FIG. 10 showing gas flow from orifices of a primary and a secondary injector across a wafer and to an exhaust port according to still another embodiment of the present invention;
  • FIG. 16 is a cross-sectional view of a thermal processing apparatus having an alternative up-flow injector system according to an embodiment of the present invention
  • FIG. 17 is a cross-sectional view of a thermal processing apparatus having an alternative down- flow injector system according to an embodiment of the present invention
  • FIG. 18 is flowchart showing an embodiment of a process for thermally processing a batch of wafers according to an embodiment of the present invention whereby each wafer of the batch of wafers is quickly and uniformly heated to the desired temperature;
  • FIG. 19 is flowchart showing another embodiment of a process for thermally processing a batch of wafers according to an embodiment of the present invention whereby each wafer of the batch of wafers is quickly and uniformly heated to the desired temperature.
  • the present invention is directed to an apparatus and method for processing a relatively small number or mini-batch of one or more work pieces, such as semiconductor substrates or wafers, held in a ca ⁇ ier, such as a cassette or boat, that provides reduced processing cycle times and improved process uniformity.
  • mini-batch means a number of wafers less than the hundreds of wafers found in the typical batch systems, and preferably in the range of from one to about fifty-three semiconductor wafers or wafers, of which from one to fifty are product wafers and the remainder are non-product wafers used for monitoring purposes and as baffle wafers.
  • thermal processing it is meant processes that in which the work piece or wafer is heated to a desired temperature which is typically in the range of about 350°C to 1300°C.
  • Thermal processing of semiconductor wafers can include, for example, heat treating, annealing, diffusion or driving of dopant material, deposition or growth of layers of material, such as chemical vapor deposition or CVD, and etching or removal of material from the wafers.
  • thermal processing apparatus A thermal processing apparatus according to an embodiment will now be described with reference to FIG. 1. For purposes of clarity, many of the details of thermal processing apparatuses that are widely known and are widely known to a person of skill in the art have been omitted. Such detail is described in more detail in, for example, commonly assigned U.S. Patent number 4,770,590, which is incorporated herein by reference.
  • FIG. 1 is a cross-sectional view of an embodiment of a thermal processing apparatus for thermally processing a batch of semiconductor wafers.
  • the thermal processing apparatus 100 generally includes a vessel 101 that encloses a volume to form a process chamber 102 having a support 104 adapted for receiving a carrier or boat 106 with a batch of wafers 108 held therein, and heat source or furnace 110 having a number of heating elements 112-1, 112-2 and 112-3 (referred to collectively hereinafter as heating elements 112) for raising a temperature of the wafers to the desired temperature for thermal processing.
  • heating elements 112 a number of heating elements 112-1, 112-2 and 112-3
  • the thermal processing apparatus 100 further includes one or more optical or electrical temperature sensing elements, such as a resistance temperature device (RTD) or thermal couple (T/C), for monitoring the temperature within the process chamber 102 and/or controlling operation of the heating elements 112.
  • a resistance temperature device RTD
  • T/C thermal couple
  • the temperature sensing element is a profile T/C 114 that has multiple independent temperature sensing nodes or points (not shown) for detecting the temperature at multiple locations within the process chamber 102.
  • the thermal processing apparatus 100 can also include one or more injectors 116 (only one of which is shown) for introducing a fluid, such as a gas or vapor, into the process chamber 102 for processing and/or cooling the wafers 108, and one or more purge ports or vents 118 (only one of which is shown) for introducing a gas to purge the process chamber and/or to cool the wafers.
  • a liner 120 increases the concentration of processing gas or vapor near the wafers 108 in a region or process zone 128 in which the wafers are processed, and reduces contamination of the wafers from flaking or peeling of deposits that can form on interior surfaces of the process chamber 102. Processing gas or vapor exits the process zone through exhaust ports or slots 121 in the chamber liner 120.
  • the dimensions of the process chamber 102 and the base-plate 124 are selected to provide a rapid evacuation, rapid heating and a rapid backfilling of the process chamber.
  • the vessel 101 and the base-plate 124 are sized to provide a process chamber 102 having dimensions selected to enclose a volume substantially no larger than necessary to accommodate the carrier 106 with the wafers 108 held therein.
  • the vessel 101 and the base-plate 124 are sized to provide a process chamber 102 having dimensions of from about 125 to about 150% of that necessary to accommodate the carrier 106 with the wafers 108 held therein, and more preferably, the process chamber has dimensions no larger than about 125% of that necessary to accommodate the carrier and the wafers in order to minimize the chamber volume which aids in pump down and back-fill time required. Openings for the injectors 116, T/Cs 114 and vents 118 are sealed using seals such as o-rings, VCR ® , or CF fittings.
  • seals such as o-rings, VCR ® , or CF fittings.
  • Gases or vapor released or introduced during processing are evacuated through a foreline or exhaust port 126 formed in a wall of the process chamber 102 (not shown) or in a plenum 127 of the base-plate 124, as shown in FIG. 1.
  • the process chamber 102 can be maintained at atmospheric pressure during thermal processing or evacuated to a vacuum as low as 5 millitorr through a pumping system (not shown) including one or more roughing pumps, blowers, hi-vacuum pumps, and roughing, throttle and foreline valves.
  • the base-plate 124 further includes a substantially annular flow channel 129 adapted to receive and support an injector 116 including a ring 131 from which depend a number of vertical injector tube or injectors 116A.
  • the injectors 116A can be sized and shaped to provide an up-flow, down flow or cross-flow flow pattern, as described below.
  • the ring 131 and injectors 116A are located so as to inject the gas into the process chamber 102 between the boat 106 and the vessel 101.
  • the injectors 116A are spaced apart around the ring 131 to uniformly introduce process gas or vapor into the process chamber 102, and may, if desired, be used during purging or backfilling to introduce a purge gas into the process chamber.
  • the base-plate 124 is sized in a short cylindrical form with an outwardly extending upper flange 133, a sidewall 135, and an inwardly extending base 137.
  • the upper flange 133 is adapted to receive and support the vessel 101, and contains an o-ring 122 to seal the vessel to the upper flange.
  • the base 137 is adapted to receive and support the liner 120 outside of where the ring 131 of injectors 116 is supported.
  • the base-plate 124 shown in FIG. 2 incorporates various ports including backfill/purge gas inlet ports 139, 143, cooling ports 145,147, provided to circulate cooling fluid in the base-plate 124, and a pressure monitoring port 149 for monitoring pressure within the process chamber 102.
  • Process gas inlet ports 151, 161 introduce a gas from a supply (not shown) to the injectors 116.
  • the backfill/purge ports 139,143 are provided at the sidewall 135 of the base-plate 124 principally to introduce a gas from a vent/purge gas supply (not shown) to the vents 118.
  • a mass flow controller (not shown) or any other suitable flow controller is placed in line between the gas supplies and the ports 139, 143, 151 and 161 to control the gas flow into the process chamber 102.
  • the vessel 101 and liner 120 can be made of any metal, ceramic, crystalline or glass material that is capable of withstanding the thermal and mechanical stresses of high temperature and high vacuum operation, and which is resistant to erosion from gases and vapors used or released during processing.
  • the vessel 101 and liner 120 are made from an opaque, translucent or transparent quartz glass having a sufficient thickness to withstand the mechanical stresses and that resists deposition of process byproducts, thereby reducing potential contamination of the processing environment. More preferably, the vessel 101 and liner 120 are made from quartz that reduces or eliminates the conduction of heat away from the region or process zone 128 in which the wafers 108 are processed.
  • the batch of wafers 108 is introduced into the thermal processing apparatus 100 through a load lock or loadport (not shown) and then into the process chamber 102 through an access or opening in the process chamber or base-plate 124 capable of forming a gas tight seal therewith.
  • the process chamber 102 is a vertical reactor and the access utilizes a movable pedestal 130 that is raised during processing to seal with a seal, such as an o-ring 132 on the base-plate 124, and lowered to enable an operator or an automated handling system, such as a boat handling unit (BHU) (not shown), to position the carrier or boat 106 on the support 104 affixed to the pedestal.
  • the heating elements 112 include elements positioned proximal to a top 134
  • the heating elements 112 surround the wafers to achieve a good view factor of the wafers and thereby provide an isothermal control volume or process zone 128 in the process chamber in which the wafers 108 are processed.
  • the heating elements 112-1 proximal to the bottom 138 of the process chamber 102 can be disposed in or on the pedestal 130. If desired, additional heating elements may be disposed in or on the base plate 124 to supplement heat from the heating elements 112-1.
  • the heating elements 112-1 proximal to the bottom of the process chamber preferably are recessed in the movable pedestal 130.
  • the pedestal 130 is made from a thermally and electrically insulating material or insulating block 140 having an electric, resistive heating elements 112-1 embedded therein or affixed thereto.
  • the pedestal 130 further includes one or more feedback sensors or T/Cs 141 used to control the heating elements 112-1. In the configuration shown, the T/Cs 141 are embedded in the center of the insulating block 140.
  • the side heating elements 112-2 and the top heating elements 112-3 may be disposed in or on an insulating block 110 about the vessel 101.
  • the heating elements 112 and the insulating blocks 110 and 140 may be configured in any of a variety of ways and may be made in any of a variety of ways and with any of a variety of materials. Some suitable configurations, fabrication techniques and materials are well known in the art, and others are described in a PCT Patent Application Serial No. TBD entitled "Variable Heater Element For Low To High Temperature Ranges," which was filed on even date herewith under Attorney Docket No. FP-71795-PC, and which hereby is incorporated herein by reference thereto in its entirely.
  • the heating elements 112-1 proximal to the bottom 138 of the process chamber 102 have a maximum power output of from about 0.1 kW to about 10 kW with a maximum process temperature of at least 1150°C. More preferably, these bottom heating elements 112-1 have a power output of at least about 3.8 kW with a maximum process temperature of at least 950°C.
  • the side heating elements 112-2 are functionally divided into multiple zones, including a lower zone nearest the pedestal 130 and upper zone, each of which are capable of being operated independently at different power levels and duty cycles from each other and from the top heating elements 112-3 and bottom heating elements 112-1.
  • the heating elements 112 are controlled in any suitable manner, either by using a control technique of a type well known in the art, or the control technique described in a PCT Patent Application Serial No. TBD entitled “Feed Forward Temperature Controller”, which was filed on even date herewith under Attorney Docket No. FP-71754-PC, and which hereby is incorporated herein by reference thereto in its entirely.
  • Contamination from the insulating block 140 and bottom heating elements 112-1 is reduced if not eliminated by housing the heating element and insulation block in an inverted quartz crucible 142, which serves as a barrier between the heating element and insulation block and the process chamber 102.
  • the crucible 142 is also sealed against the loadport and BHU environment to further reduce or eliminate contamination of the processing environment.
  • the interior of the crucible 142 is at standard atmospheric pressure, so that the crucible 142 should be strong enough to withstand a pressure differential between the process chamber 102 and the pedestal 130 across the crucible 142 of as much as 1 atmosphere.
  • the bottom heating elements 112-1 are powered to maintain an idle temperature lower than the desired processing temperature.
  • the idle temperature can be from 50-150°.
  • the idle temperature can be set higher for certain processes, such as those having a higher desired processing temperature and/or higher desired ramp up rate, or to reduce thermal cycling effects on the bottom heating elements 112-1, thereby extending element life.
  • the bottom heating elements 112-1 can be ramped to at or below the desired process temperature during the push or load, that is while the pedestal 130 with a boat 106 of wafers 108 positioned thereon is being raised.
  • the bottom heating elements 112-1 reach the desired process temperature at the same time as the heating elements 112-3 and 112-2 located proximal to respectively the top 134 and side 136 of the process chamber 102.
  • the temperature of the bottom heating elements 112-1 can begin being ramped up before the pedestal 130 begins being raised, while the last of the wafers 108 in a batch are being loaded.
  • power to the bottom heating elements 112-1 can be reduce or removed completely to begin ramping down the pedestal 130 to the idle temperature, in preparation for cooling of the wafers 108 and unloading by the BHU.
  • a purge line for air or an inert purge gas such as nitrogen
  • nitrogen is injected through a passage 144 through the center of the insulating block 140 and allowed to flow out between the top of the insulating block 140 and the interior of the crucible 142 to a perimeter thereof.
  • the hot nitrogen is then exhausted to the environment either through High Efficiency Particulate Air (HEP A) filter (not shown) or to a facility exhaust (not shown).
  • HEP A High Efficiency Particulate Air
  • This center injection configuration facilitates the faster cooling of the center of the wafers 108, and therefore is ideal to minimize the center/edge temperature differential of the bottom wafer or wafers, which could otherwise result in damage due to slip-dislocation of the crystal lattice structure.
  • the idle temperature can be set higher, closer to the desired processing temperature to reduce the effects of thermal cycling.
  • the resistive heating elements are formed from an Aluminum containing alloy, such as Kanthal ®
  • baking out the heating elements 112-1 in an oxygen rich environment promotes an alumna oxide surface growth.
  • the insulating block 140 can further include an oxygen line (not shown) to promote the formation of the protective oxide surface coat during bake out of the heating elements 112-1.
  • oxygen for bake out can be introduced through the purge line used during processing to supply cooling nitrogen via a three-way valve.
  • FIG. 3 is a cross-sectional view of a portion of a thermal processing apparatus 100.
  • FIG. 3 shows the thermal processing apparatus 100 while the wafers 108 are being loaded or unloaded, that is while the pedestal 130 is in the lowered position.
  • the thermal processing apparatus 100 further includes a thermal shield 146 that can be rotated or slid into place above the pedestal 130 and the lower wafer 108 in the boat 106.
  • the thermal shield is reflective on the side facing the heating elements 112-1 and absorptive on the side facing the wafers 108.
  • Purposes of the thermal shield 146 include increasing the rate of cooling of the wafers 108 lower down in the boat 106, and assisting in maintaining the idle temperature of the pedestal 130 and bottom heating elements 112-1 to decrease the time required to ramp up the process chamber 102 to the desired processing temperature.
  • An embodiment of a thermal processing apparatus having a thermal shield will now be described in further detail with reference to FIGs. 3 through 6.
  • FIG. 3 also shows an embodiment of a thermal processing apparatus 100 having pedestal heating elements 112-1 and a thermal shield 146.
  • the thermal shield 146 is attached via arm 148 to a ratable shaft 150 that is turned by an electric, pneumatic or hydraulic actuator to rotate the thermal shield 146 into a first position between the heated pedestal 130 and the lowest of the wafers 108 in the boat 106 during the pull or unload cycle, and removed or rotated to a second position not between the pedestal and the wafers during at least a final portion or end of the push or load cycle, just before the bottom of the boat 106 enters into the chamber 102.
  • the ratable shaft 150 is mounted on or affixed to the mechanism (not shown) used for raising and lowering the pedestal 130, thereby enabling the thermal shield 146 to be rotated into position as soon as the top of the pedestal has cleared the process chamber 102. Having the shield 146 in place during the load cycle enables the heating elements 112-1 to be heated to a desired temperature more rapidly than would otherwise be possible. Similarly, during unload cycle the shield 146 helps in cooling the wafers, particularly those closer to the pedestal, by reflect the heat radiating from the pedestal heating elements 112-1.
  • the ratable shaft 150 can be a mounted on or affixed to another part of the thermal processing apparatus 100 and adapted to move axially in synchronization with the pedestal 130, or to rotate the thermal shield 146 into position only when the pedestal is fully lowered.
  • FIG. 4 is a diagrammatic illustration of the pedestal heating elements 112-1 and thermal shield 146 of FIG. 3 illustrating the reflection of thermal energy or heat radiating from the bottom heating elements back to the pedestal 130 and the absorption of thermal energy or heat radiating from the lower wafer 108 in the batch or stack of wafers. It has been determined that the desired characteristics, high reflectivity and high absorptivity, can be obtained using a number of different materials, such as metals, ceramic, glass or polymeric coatings, either individually or in combination. By way of example the following table list various suitable materials and co ⁇ esponding parameters.
  • the thermal shield 146 can be made from a single material such as silicon-carbide (SiC), opaque quartz or stainless steel which has been polished on one side and scuffed, abraded or roughened on the other.
  • SiC silicon-carbide
  • opaque quartz or stainless steel which has been polished on one side and scuffed, abraded or roughened on the other.
  • Roughening a surface of the thermal shield 146 can significantly change its heat transfer properties, particularly its reflectivity.
  • the thermal shield 146 can be made from two different layers of material.
  • FIG. 5 is a diagrammatic illustration of a thermal shield 146 having a top layer 152 of material, such as SiC or opaque quartz, with a high absorptivity and a lower layer 154 of material or metal, such as polished stainless steel or polished aluminum, with a high reflectivity.
  • a top layer 152 of material such as SiC or opaque quartz
  • a lower layer 154 of material or metal such as polished stainless steel or polished aluminum
  • the lower layer 154 can be an extremely thin layer or film of polished metal deposited, formed or plated on a quartz plate that forms the top layer 152.
  • the materials can be integrally formed or interlocking, or joined by conventional means such as bonding or fasteners.
  • the thermal shield 146 further includes an internal cooling channel 156 to further insulate the wafers 108 from the bottom heating elements 112-1.
  • the cooling channel 156 is formed between two different layers 152 and 154 of material.
  • the cooling channel 156 can be formed by milling or any other suitable technique in a highly absorptive opaque quartz layer 152, and be covered by a metal layer 154 or coating such as a Titanium or Aluminum coating.
  • the cooling channel 156 can be formed in the metal layer 154 or both the metal layer and the quartz layer 152.
  • FIG 7 is a perspective view of an embodiment of a thermal shield assembly 153 including the thermal shield 146, arm 148, ratable shaft 150 and an actuator 155.
  • the thermal processing apparatus 100 further includes a shutter 158 that can be rotated or slid or otherwise moved into place above the boat 106 to isolate the process chamber 102 from the outside or load port environment when the pedestal 130 is in the fully lowered position.
  • the shutter 158 can be slid into place above the carrier 106 when the pedestal 130 is in a lowered position, and raised to isolate the process chamber 102.
  • the shutter 158 can be rotated or swung into place above the carrier 106 when the pedestal 130 is in a lowered position, and subsequently raised to isolate the process chamber 102.
  • the shutter 158 may be rotated about or relative to threaded screw or rod to simultaneously raise the shutter to isolate the process chamber 102 as it is swung into place above the carrier 106.
  • the shutter 158 could form a vacuum seal against the base-plate 124 to allow the process chamber 102 to be pumped down to the process pressure or vacuum. For example, it may be desirable to pump down the process chamber 102 between sequential batches of wafers to reduce or eliminate the potential for contaminating the process environment.
  • Forming a vacuum seal is preferably done with a large diameter seal, such as an o-ring, and thus the shutter 158 can desirably include a number of water channels 160 to cool the seal.
  • the shutter 158 seals with the same o-ring 132 used to seal with the crucible 142 when the pedestal 130 is in the raised position.
  • the shutter 158 is simply an insulating plug designed to reduce heat loss from the bottom of the process chamber.
  • One embodiment for accomplishing this involves the use of an opaque quartz plate, which may or may not further include a number of cooling channels underneath or internal thereto.
  • the shutter 158 When the pedestal 130 is in the fully lowered position, the shutter 158 is moved into position below the process chamber 102 and then raised to isolate the process chamber by one or more electric, hydraulic or pneumatic actuators (not shown).
  • the actuators are pneumatic actuators using from about 15 to 60 pounds per square inch gauge (PSIG) air, which is commonly available on thermal processing apparatus 100 for operation of pneumatic valves.
  • the shutter 158 can comprise a plate having a number of wheels attached via short arms or cantilevers to two sides thereof. In operation, the plate or shutter 158 is rolled into position beneath the process chamber 102 on two parallel guide rails. Stops on the guide rails then cause the cantilevers to pivot translating the motion of the shutter 158 into an upward direction to seal the process chamber 102.
  • the thermal processing apparatus 100 further includes a magnetically coupled wafer rotation system 162 that rotates the support 104 and the boat 106 along with the wafers 108 supported thereon during processing.
  • Rotating the wafers 108 during processing improves within wafer (WIW) uniformity by averaging out any non-uniformities in the heating elements 112 and in process gas flows to create a uniform on-wafer temperature and species reaction profile.
  • the wafer rotation system 162 is capable of rotated the wafers 108 at a speed of from about 0.1 to about 10 revolutions per minute (RPM).
  • the wafer rotation system 162 includes a drive assembly or rotating mechanism 164 having a rotating motor 166, such as an electric or pneumatic motor, and a magnet 168 encased in a chemically resistive container, such as annealed polytetrafluoroethylene or stainless steel.
  • a chemically resistive container such as annealed polytetrafluoroethylene or stainless steel.
  • a steel ring 170 located just below the insulating block 140 of the pedestal 130, and a drive shaft 172 with the insulating block transfer the rotational energy to another magnet 174 located above the insulating block in a top portion of the pedestal.
  • the steel ring 170, drive shaft 172 and second magnet 174 are also encased in a chemically resistive container compound.
  • the magnet 174 located in the side of the pedestal 130 magnetically couples through the crucible 142 with a steel ring or magnet 176 embedded in or affixed to the support 104 in the process chamber 102.
  • Magnetically coupling the rotating mechanism 164 through the pedestal 130 eliminates the need for locating it within the processing environment or for having a mechanical feedthrough, thereby eliminating a potential source of leaks and contamination. Furthermore, locating rotating mechanism 164 outside and at some distance from the processing minimizes the maximum temperature of to which it is exposed, thereby increasing the reliability and operating life of the wafer rotation system 162.
  • the wafer rotation system 162 can further include one or more sensors (not shown) to ensure proper boat 106 position and proper magnetic coupling between the steel ring or magnet 176 in the process chamber 102 and the magnet 174 in the pedestal 130.
  • the boat position verification sensor includes a sensor protrusion (not shown) on the boat 106 and an optical or laser sensor located below the base- plate 124. In operation, after the wafers 108 have been processed and the pedestal 130 is lowered about 3 inches below the base-plate 124. There, the wafer rotation system 162 is commanded to turn the boat 106 until the boat sensor protrusion can be seen.
  • the wafer rotation system 162 is operated to align the boat so that the wafers 108 can be unloaded. After this is done, the boat is lowered to the load/unload height. After the initial check, it is only capable of verifying the boat location from the flag sensor.
  • improved injectors 216 are preferably used in the thermal processing apparatus 100.
  • the injectors 216 are distributive or cross(X)- flow injectors 216-1 in which process gas or vapor is introduced through injector openings or orifices 180 on one side of the wafers 108 and boat 106 and caused to flow across the surfaces of the wafers in a laminar flow to exit exhaust ports or slots 182 in the chamber line 120 on opposite the side.
  • X-flow injectors 116-1 improve wafer 108 to wafer uniformity within a batch of wafers 108 by providing an improved distribution of process gas or vapor over earlier up-flow or down flow configurations.
  • X-flow injectors 216 can serve other purposes, including the injection of gases for cool-down (e.g., helium, nitrogen, hydrogen) for forced convective cooling between the wafers 108.
  • gases for cool-down e.g., helium, nitrogen, hydrogen
  • Use of X-flow injectors 216 results in a more uniform cooling between wafers 108 whether disposed at the bottom or top of the stack or batch and those wafers that are disposed in the middle, as compared with earlier up-flow or down flow configurations.
  • the injector 216 orifices 180 are sized, shaped and position to provide a spray pattern that promotes forced convective cooling between the wafers 108 in a manner that does not create a large temperature gradient across the wafer. FIG.
  • FIG. 11 is a cross-sectional side view of a portion of the thermal processing apparatus 100 of FIG. 10 showing illustrative portions of the injector orifices 180 in relation to the chamber liner 120 and the exhaust slots 182 in relation to the wafers 108.
  • FIG. 12 is a plan view of a portion of the thermal processing apparatus 100 of FIG. 10 taken along the line A-A of FIG. 10 showing laminar gas flow from the orifices 180-1 and 180-2 of primary and secondary injectors 184, 186, across an illustrative one of the wafers 108 and to exhaust slots 182-1 and 182-2 according to one embodiment. It should be noted that the position of the exhaust slot 182 as shown in FIG.
  • the process gas or vapor is initially directed away from the wafers 108 and toward the liner 120 to promote mixing of the process gas or vapor before it reaches the wafers.
  • This configuration of orifices 180-1 and 180-2 is particularly useful for processes or recipes in which different reactants are introduced from each of the primary and secondary injectors 184, 186, for example to form a multi-component film or layer.
  • FIG. 13 is another plan view of a portion of the thermal processing apparatus 100 of FIG. 10 taken along the line A-A of FIG. 10 showing an alternative gas flow path from the orifices 180 of the primary and secondary injector 184, 186, across an illustrative on of the wafer 108 and to the exhaust slots 182 according to another embodiment.
  • FIG. 14 is another plan view of a portion of the thermal processing apparatus 100 of FIG. 10 taken along the line A-A of FIG. 10 showing an alternative gas flow path from the orifices 180 of the primary and secondary injector 184, 186, across an illustrative on of the wafer 108 and to the exhaust slots 182 according to yet another embodiment.
  • FIG. 15 is another plan view of a portion of the thermal processing apparatus 100 of FIG. 10 taken along the line A-A of FIG. 10 showing an alternative gas flow path from the orifices 180 of the primary and secondary injector 184, 186, across an illustrative on of the wafer 108 and to the exhaust slots 182 according to still another embodiment.
  • FIG. 16 is a cross-sectional view of a thermal processing apparatus 100 having two or more up-flow injectors 116-1 and 116-2 according to an alternative embodiment.
  • process gas or vapor admitted from the process injectors 116-1 and 116-2 having respective outlet orifices low in the process chamber 102 flows up and across the wafers 108, and spent gases exit exhaust slots 182 in the top of the liner 120.
  • An up-flow injector system is also shown in FIG. 1.
  • FIG. 17 is a cross-sectional view of a thermal processing apparatus 100 having a down-flow injector system according to an alternative embodiment.
  • the injectors 116, 216, and/or the liner 120 can be quickly and easily replaced or swapped with other injectors and liners having different points for the injection and exhausting of the process gas from the process zone 128.
  • the embodiment of the x-flow injector 216 shown in FIG. 10 adds a degree of process flexibility by enabling the flow pattern within the process chamber 102 to be quickly and easily changed from a cross-flow configuration, as shown in FIG.
  • FIG. 10 to an up-flow configuration, as shown in FIGs. 1 and 16, or a down-flow configuration, as shown in FIG. 17.
  • This can be accomplished through the use of easily installable injector assemblies 216 and liners 120 to convert the flow geometry from cross-flow to an up-flow or down- flow.
  • FIG. 18 is a flowchart showing steps of a method for thermally processing a batch of wafers 108 wherein each wafer of the batch of wafers is quickly and uniformly heated to the desired temperature.
  • the pedestal 130 is lowered, and the thermal shield 142 is moved into a position while the pedestal 130 is lowered to reflect heat from the bottom heating element 112-1 back to the pedestal 130 to maintain the temperature thereof, and to insulate the finished wafers 108 (step 190).
  • the shutter 158 is moved into position to seal or isolate the process chamber 102 (step 192), and power is applied to the heating elements 112-2, 112-3, to begin pre-heating the process chamber 102 to or maintain at an intermediate or idling temperature (step 194).
  • a carrier or boat 106 loaded with new wafers 108 is positioned on the pedestal 130 (step 196).
  • the pedestal 130 is raised to position the boat in the process zone 128, while simultaneously removing the shutter 158, the thermal shield 142, and ramping-up the bottom heating element 112-1 to preheat the wafers to an intermediate temperature (step 197).
  • the thermal shield 142 is removed just before the boat 106 is positioned in the process zone 128.
  • a fluid such as a process gas or vapor, is introduced on one side of the of wafers 108 through a plurality of injection ports 180 (step 198). The fluid flows from the injection ports 180 across surfaces of the wafers 108 to exhaust ports 182 positioned in the liner 120 on the opposite side of the wafers relative to the injection ports (step 199).
  • the boat 106 can be rotated within the process zone 128 during thermal processing of the batch of wafers 108 to further enhance uniformity of the thermal processing, by magnetically coupling mechanical energy through the pedestal 130 to the carrier or boat 106 to reposition it during thermal processing of the wafers (step 200).
  • FIG. 19 is a flowchart showing steps of an embodiment of a method for thermally processing a batch of wafers 108 in a carrier.
  • an apparatus 100 is provided having a process chamber 102 with dimensions and a volume not substantially larger than necessary (guard heaters absent) to accommodate the carrier 106 with the wafers 108 held therein.
  • the pedestal 130 is lowered, and the boat 106 with the wafers 108 held therein positioned thereon (step 202).
  • the pedestal 130 is raised to insert the boat in the process chamber 102, while simultaneously preheating the wafers 108 to an intermediate temperature (step 204).
  • Power is applied to the heating elements 112-1, 112-2, 112-3, each disposed proximate to at least one of the top wall 134, the side wall 136 and the bottom wall 138 of the process chamber 102 to begin heating the process chamber (step 206).
  • power to at least one of the heating elements is adjusted independently to provide a substantially isothermal environment at a desired temperature in a process zone 128 in the process chamber 102 (step 208).
  • the pedestal 130 is lowered, and the thermal shield 142 is moved into position to insulate the finished wafers 108 and to reflect heat from the bottom heating element 112-1 back to the pedestal 130 to maintain the temperature thereof (step 210).
  • the shutter 158 is moved into position to seal or isolate the process chamber 102, and power applied to the heating elements 112-2, 112-3, to maintain the temperature of the process chamber (step 212).
  • the boat 106 is then removed from the pedestal 130 (step 214), and another boat loaded with a new batch of wafers to be processed positioned on the pedestal (step 216).
  • the shutter 158 is repositioned or removed (step 218), and the thermal shield withdrawn or repositioned to preheat the wafers 108 in the boat 106 to an intermediate temperature while simultaneously raising the pedestal 130 to insert the boat into the process chamber 102 to thermally process the new batch of wafers (step 220).
  • thermal processing apparatus 100 reduces the processing or cycle time by about 75% over conventional systems.
  • a conventional large batch thermal processing apparatus may process 100 product wafers in about 232 minutes, including pre-processing and post-processing time.
  • the inventive thermal processing apparatus 100 performs the same processing on a mini-batch of 25 product wafers 108 in about 58 minutes.

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Abstract

L'invention porte sur un appareil (100) et des procédés de traitement thermique de substrats (108) placés sur un support (106). L'appareil (100) comprend une cuve (101) présentant un sommet (134), des parois latérales (136) une base (138), et abritant une source de chaleur (110) munie d'éléments chauffants (112-1, 112-2, 112-3) proximaux. La cuve (101) est dimensionnée pour englober un volume pas plus grand que nécessaire pour loger le support (106) et fournir une zone (128) de traitement thermique traversante. Dans une exécution, la base (138) comporte un pied amovible (140), muni d'un élément chauffant (112-1), et pouvant s'abaisser ou se relever pour permettre d'introduire le support (106) dans la cuve (102). L'appareil peut également comprendre un blindage mobile se plaçant entre le pied (140) et le support (106) de manière à protéger le substrat de la chaleur de l'élément chauffant (112-1) et à maintenir la température du pied. Un système (162) de repositionnement à couplage magnétique repositionne le support (106) pendant le traitement du substrat (108) sans qu'il soit prévu de d'amenée mobile dans le volume de la cuve (101) et sans devoir déplacer l'élément chauffant (112-1) de la base du pied (140).
EP03764437A 2002-07-15 2003-07-10 Systeme de traitement thermique et chambre verticale configurable Withdrawn EP1522090A4 (fr)

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US39653602P 2002-07-15 2002-07-15
US396536P 2002-07-15
US42852602P 2002-11-22 2002-11-22
US428526P 2002-11-22
PCT/US2003/021575 WO2004008491A2 (fr) 2002-07-15 2003-07-10 Systeme de traitement thermique et chambre verticale configurable

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