WO1997003223A1 - Gas distribution apparatus - Google Patents
Gas distribution apparatus Download PDFInfo
- Publication number
- WO1997003223A1 WO1997003223A1 PCT/US1996/010657 US9610657W WO9703223A1 WO 1997003223 A1 WO1997003223 A1 WO 1997003223A1 US 9610657 W US9610657 W US 9610657W WO 9703223 A1 WO9703223 A1 WO 9703223A1
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- WO
- WIPO (PCT)
- Prior art keywords
- plenum
- nozzle structure
- gaseous substance
- gas distribution
- plenum body
- Prior art date
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Classifications
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- 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
Definitions
- This invention relates in general to system for distributing gaseous substances and, more particularly, to a gas distribution ring for semiconductor wafer processing systems.
- the processing of semiconductor wafers is typically accomplished by positioning the wafer in a chamber and subjecting the surface of the wafer to various chemical substances.
- the chemistry of the substances depends upon the type of processing employed as well as the nature of the devices formed on the surface of the semiconductor wafer.
- the chemical substances are generally delivered to the chamber either in gaseous form or with a carrier gas. With some processes, the formation of the film layers on the wafer surface is enhanced using high density plasma.
- One type of gas delivery system employs a stainless steel ring vertically spaced above the exposed surface of the wafer. The gaseous substance flows through nozzles mounted to the ring and into the processing chamber toward the wafer surface.
- Another type of device includes a manifold which extends across the wafer surface. The manifold has a plurality of nozzles or holes for showering the wafer with the gaseous substances required for the chemical process. Repair and maintenance of the available gas delivery devices is typically a labor intensive and time consuming process. The device must be disassembled to adequately clean the nozzle holes and interior plenums, interrupting the process for an extended period of time and significantly reducing the efficiency and output of the processing system.
- the nozzles with devices such as the gas distribution ring may not be removed or replaced because they are an integral component of the device.
- a gas distribution system which may be efficiently repaired and maintained without significantly interrupting the processing operation is desirable.
- a more general object of the invention is to provide a gas distribution apparatus which may be economically manufactured and easily installed in a processing chamber, and which may be conveniently and efficiently repaired and maintained.
- this invention provides a gas distribution apparatus which is particularly suitable for delivering a gaseous substance to a processing chamber.
- the apparatus generally includes a plenum body mountable to the chamber, a replaceable nozzle structure removably mounted to the plenum body and at least one plenum formed for receiving a gaseous substance.
- the plenum body is formed with at least one conduit which is coupled to the plenum for delivery of the gaseous substance to the plenum.
- the nozzle structure has a plurality of nozzles coupled to the plenum and configured for injecting the gaseous substance from the plenum to the chamber.
- Figure 1 is a schematic perspective view, partially broken away, ofa gas distribution apparatus in accordance with this invention, shown installed in a plasma-enhanced chemical vapor deposition system.
- Figure 2 is a front plan view, partially broken away, of the gas distribution apparatus of Figure 1.
- Figure 3 is a cross-sectional view taken along line 3-3 of Figure 2.
- Figure 4 is a cross-sectional view taken along line 4-4 of Figure 2.
- Figure 5 is a cross-sectional of a gas distribution apparatus in accordance with another embodiment of the invention.
- FIG. 1 shows a gas distribution apparatus 10 which is particularly suitable for delivering a gaseous substance to a chamber 12 of processing system 14.
- Processing system 14 is used for plasma-enhanced chemical vapor deposition processing, although it is to be understood that the apparatus 10 may also be used with other processes on the wafer including, but not limited to, chemical vapor deposition, etching, high temperature film deposition, and the like.
- Processing system 14 generally includes a chamber wall 16 and a top plate 18 enclosing the chamber 12.
- a support assembly 20 supports a wafer 22 within the chamber 12 for processing.
- the support assembly 20 is an electrostatic clamp assembly of the type disclosed in co-pending application Serial No. (Flehr, Hohbach, Test, Albritton & Herbert File No. A-
- a plasma source 24 mounted to the top plate 18 and substantially axially aligned with the wafer 22 generates a supply of plasma for enhancing the processing of the wafer 22.
- Plasma source 24 is described in detail in co-pending application Serial No. (Flehr,
- Gas distribution apparatus 10 is mounted to the chamber wall 16 below the top plate 18.
- the distribution apparatus has an annular configuration with the outer peripheral surface 30 of the apparatus being mounted to the chamber wall and the inner surface 32 defining a central opening which extends through the distribution apparatus.
- a plurality of nozzles 34 inject gas into the processing chamber, with the gaseous substances traveling inwardly from the distribution apparatus toward the central axis of the chamber.
- the annular configuration of the gas distribution apparatus uniformly distributes the gases around the circumference of the chamber while providing a passageway between the plasma source 24 and the wafer 22. Separating the distribution apparatus 10 from the flow of plasma also provides for independent control over the plasma density and the flow of the gaseous substances.
- the plasma generated by the source 24 and the active species of the gaseous substance move downwardly onto the wafer surface in the RF field created between the distribution apparatus 10, chamber wall 16 and the support system 20, depositing a layer of film on the wafer.
- gas distribution apparatus 10 is preferred, it is to be understood that other configurations are within the scope of the invention.
- the distribution apparatus may have a rectangular or oval configuration if desired.
- one or more arcuate distribution devices may be employed if desired.
- Gas distribution apparatus 10 is of particular advantage in high-density, plasma enhanced processing because of the effects on the gas flow of factors such as the high density of the plasma, the low pressure of the processing chamber (less than 3-4 mTorr for high density plasma enhanced processes compared to more than 100 mTorr for conventional plasma-enhanced systems), and the relatively high energy of the electrons.
- Distribution apparatus 10 generally includes a plenum body 40 mounted to the wall 16 of the chamber 12.
- the plenum body 40 is supported on a horizontally-extending ledge 42 of the chamber wall 12.
- Threaded fasteners 44 distributed around the circumference ofthe plenum body extend through bores 45 formed in the plenum body and engage the chamber wall 16 to secure the plenum body to the chamber.
- the top plate 18 covers the plenum body and is secured to the chamber wall 16 as is known in the art.
- the plenum body 40 is positioned immediately beneath the top plate 18 in the present embodiment, although it should be understood that the location of the plenum body is subject to considerable variation depending upon such factors as the design of the chamber 12, the type of processing employed and the nozzle design.
- Plenum body 40 has two parallel, circumferentially extending channels 46 and 48 formed in the plenum body. The channels 46 and 48 partially define a pair of plenums for receiving the gaseous substances employed in the processing of the wafer. Channels ⁇
- the conduits 54 and 56 are L-shaped, extending outwardly and then downwardly through the plenum body 40 to intersect vertical supply lines 58 and 60 extending through the chamber wall 16. Conduits 54 and 56 are therefore circumferentially spaced around the plenum body 40. In other modifications of the inventions, the conduits may have other configurations and supply lines 58 and 60 may be replaced with lines which extend horizontally through the chamber wall 16.
- plenum body 40 includes only one conduit for each channel although more than one conduit may be employed if desired.
- plenum body 40 may include two or more conduits evenly spaced about the circumference of the plenum body and oriented to tangentially inject the gaseous substance into the plenum with the gaseous substance from each plenum flowing through the channel in the same direction. Tangentially injecting the gaseous substance offers the advantage of improving the tangential uniformity of the surface profile because of the improved distribution of gas within the plenum.
- a baffle 62 formed with a plurality of openings is mounted in each channel 46 and 48 as is known in the art.
- Baffles 62 interrupt the flow of gas from the conduits 54 and 56 to the directly-adjacent nozzles 34 to diffuse the gas and more uniformly distribute the flow of gas around the circumference of the plenum body 40.
- the configuration of the baffles 62 is selected to provide an optimum distribution of gas and is subject to considerable variation. Moreover, the baffle 62 may be omitted if desired.
- a nozzle structure 70 is removably mounted to the plenum body 40, covering the channels 46 and 48 enclosing the plenums.
- the nozzle structure includes a plurality of first nozzles 34a substantially aligned with the channel 46 and a plurality of second nozzles 34b aligned with the channel 48 for injecting the gaseous substances retained in the plenums into the processing chamber.
- the nozzles are integrally formed with the nozzle structure 70 by machining or other suitable means.
- the nozzles may be mounted to the nozzle structure separately using threads, snap-fittings or other suitable securement means. The size, shape, spacing, angle and orientation of the nozzles is subject to considerable variation.
- the nozzles are uniformly spaced around the circumference of the nozzle structure 70, although if required the spacing may be varied to provide a more uniform distribution of gas.
- the nozzles are preferably configured to provide the layers formed on the wafer surface with a substantially flat profile. As is shown in Figure 2, the nozzles 34 are oriented at an angle in the range of 30° to 90° relative to the wafer plane. However, the nozzles may be oriented at other angles depending on the vertical distance separating the nozzle structure 70 and the wafer 22 and the desired deposition profile on the wafer.
- nozzle structure 70 includes an annular flange 74 for mounting the nozzle structure to the plenum body.
- a plurality of fasteners 76 engage the flange 74 and the plenum body 40 to securely mount the nozzle structure to the plenum body.
- a protective liner 78 formed of quartz or another suitable material extends across the annular flange 74 and plenum body to isolate the fastener 76 and the plenum body from the interior of the processing chamber.
- Seal rings 79 are compressed between the nozzle structure 70 and the plenum body 40 to isolate the plenums and prevent gas leakage between the plenums and between the plenums and the chamber 12.
- the seal rings are formed of a suitable material resistant to high temperatures such as Kalrez or
- Chemraz, but Viton O-rings may also be employed for lower temperature processes.
- the nozzle structure 70 may be conveniently removed from the plenum body by disengaging the fasteners 76 from the plenum body. Removing nozzle structure 70 facilitates cleaning and maintenance of the gas distribution apparatus 10. If desired, a second nozzle structure may be mounted to the plenum body 40 while the first is cleaned, allowing the wafer processing to continue without an expensive and time consuming delay. The second nozzle structure may have an entirely different nozzle configuration than the first if desired. The ability to conveniently remove the nozzle structure 70 improves the efficiency of the repair and maintenance of the gas distribution apparatus 10 and offers considerable flexibility in tailoring the nozzle design to a specific processing application. When the distribution apparatus 10 is used with a plasma enhanced process as in the present embodiment, the nozzle structure 70 is exposed to a high potential RF energy field.
- gas distribution apparatus 10 is preferably grounded unless the nozzle structure 70 is formed of a dielectric material.
- Plenum body 40 and nozzle structure 70 include mating surfaces 80 and 81 which are formed to maximize the surface contact between the plenum body 40 and the nozzle structure 70 to couple the nozzle structure 70 to ground.
- the mating surfaces 80 and 81 are preferably plated with a suitable material such as nickel to enhance the surface-to-surface contact.
- the mating surfaces 80 and 81 also provide a return path for the RF current when the support assembly 20 applies an RF bias to the wafer.
- the junctures between the plenum body 40 and the nozzle structure 70 and the chamber wall 16 may be lined with a suitable dielectric material.
- the nozzle structure 70 is positioned radially inwardly of the plenum body 40.
- the nozzle structure 70 may have other orientations relative to the plenum body.
- the nozzle structure may be configured so that the injection points of the nozzles 34 are spaced a greater distance from the plenum body than is shown in Figures 2 and 3.
- the orientation and position of the nozzles relative to the wafer is subject to considerable variation within the scope of the present invention.
- Figure 5 shows another embodiment of a gas distribution apparatus 100 in accordance with the present invention.
- the distribution apparatus 100 includes a plenum body 102 formed with three circumferentially extending channels 104 each defining a separate plenum for receiving a gaseous substance.
- Each channel 104 is coupled to a separate horizontally-extending conduit 105 formed in the plenum body 102 for joining the channel 104 to a gas source (not shown).
- the conduits 54 and 56 may be vertically aligned since the downward extending stretch of the uppermost conduit is omitted.
- the channels are enclosed by a nozzle structure 106 which includes a plurality of nozzles 108 associated with each channel 104 for injecting gaseous substances from the plenums into the chamber.
- the configuration of the nozzle structure 106 and the type, shape, size, number and spacing of nozzles 108 is subject to considerable variation within the scope of the invention.
- gas distribution apparatus 100 may be used to inject the same substance at two different flow rates.
- one plenum may be coupled to a source of oxygen and the other two plenums may be coupled to source of argon and silane.
- the nozzles 108 may be arranged so that the nozzles of one of the two plenums are oriented to deliver the gaseous substance to the outer areas of the wafer and the nozzles of the other plenum are oriented to deliver the gaseous substance to the center areas of the wafer.
- the different nozzle orientations which provide different surface profiles which, when combined, result in a substantially flat deposition across the wafer surface.
- the gas distribution apparatus 100 also may be used to separately inject three different gaseous substances into the processing chamber or, if desired, one of the plenums may be sealed using a suitable capping device if only two plenums are required for a particular process.
- Nozzle structure 106 is removably mounted to the plenum body 102 by a clamping device 110.
- Clamping device 110 includes a clamping plate 112 extending across the plenum body 102 and the outwardly extending flange 114 of the nozzle structure 106.
- a fastener 116 engages the clamping plate 112 and the plenum body 102 to removably secure the clamping device 110 and the nozzle structure to the plenum body 102.
- a compliant spacing element 118 is preferably positioned between the clamping device 110 and the nozzle structure 106.
- a liner 120 formed of a suitable material such as quartz covers the clamping device and plenum body. The clamping device 110 is particularly suitable for use with nozzle structures 106 which are formed of brittle materials such as ceramic materials and quartz.
- the plenum body 40 or 102 is preferably formed of aluminum or another suitable metal.
- the nozzle structure may be formed of a metal such as aluminum or a dielectric material such as a ceramic material, quartz or other dielectric material.
- the clamping device 110 is preferably formed of a metal such as aluminum, while the fasteners 76 or 116 and 44 are preferably formed of stainless steel.
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Abstract
A gas distribution apparatus (10) for delivering a gaseous substance to a chamber (12) for processing semiconductor wafers (22). The apparatus (10) includes at least one plenum (46, 48) formed for receiving a gaseous substance, a plenum body (40) mountable to the chamber (12) and having at least one conduit (54, 56) formed therein and a nozzle structure (70) removably mounted to the plenum body (40). The conduit (54, 56) is coupled to the plenum (46, 48) for delivery of the gaseous substance to the plenum (46, 48) and the nozzle structure (70) has a plurality of nozzles (34) coupled to the plenum (40) and configured for injection of the gaseous substance into the chamber (12).
Description
GAS DISTRIBUTION APPARATUS
BRIEF DESCRIPΗON OF THE INVENTION This invention relates in general to system for distributing gaseous substances and, more particularly, to a gas distribution ring for semiconductor wafer processing systems. BACKGROUND OF THE INVENTION
The processing of semiconductor wafers is typically accomplished by positioning the wafer in a chamber and subjecting the surface of the wafer to various chemical substances. The chemistry of the substances depends upon the type of processing employed as well as the nature of the devices formed on the surface of the semiconductor wafer. The chemical substances are generally delivered to the chamber either in gaseous form or with a carrier gas. With some processes, the formation of the film layers on the wafer surface is enhanced using high density plasma.
Various systems have been used to deliver the gaseous substances to the processing chamber. One type of gas delivery system employs a stainless steel ring vertically spaced above the exposed surface of the wafer. The gaseous substance flows through nozzles mounted to the ring and into the processing chamber toward the wafer surface. Another type of device includes a manifold which extends across the wafer surface. The manifold has a plurality of nozzles or holes for showering the wafer with the gaseous substances required for the chemical process. Repair and maintenance of the available gas delivery devices is typically a labor intensive and time consuming process. The device must be disassembled to adequately clean the nozzle holes and interior plenums, interrupting the process for an extended period of time and significantly reducing the efficiency and output of the processing system. The nozzles with devices such as the gas distribution ring may not be removed or replaced because they are an integral component of the device. A gas distribution system which may be efficiently repaired and maintained without significantly interrupting the processing operation is desirable.
OBJECTS AND SUMMARY OF THE INVENTION It is a primary object of this invention to provide a gas distribution apparatus for injecting gaseous substances into a processing chamber.
It is a further object of the invention to provide a gas distribution apparatus which provides a substantially uniform distribution of gas across the surface of a wafer.
It is another object of the invention to provide a gas distribution system in which the nozzles may be efficiently and convenientiy replaced.
A more general object of the invention is to provide a gas distribution apparatus which may be economically manufactured and easily installed in a processing chamber, and which may be conveniently and efficiently repaired and maintained.
In summary, this invention provides a gas distribution apparatus which is particularly suitable for delivering a gaseous substance to a processing chamber. The apparatus generally includes a plenum body mountable to the chamber, a replaceable nozzle structure removably mounted to the plenum body and at least one plenum formed for receiving a gaseous substance. The plenum body is formed with at least one conduit which is coupled to the plenum for delivery of the gaseous substance to the plenum. The nozzle structure has a plurality of nozzles coupled to the plenum and configured for injecting the gaseous substance from the plenum to the chamber.
Additional objects and features of the invention will be more readily apparent from the following detailed description and appended claims when taken in conjunction with the drawings.
BRIEF DESCRIPTION OF THE DRAWINGS Figure 1 is a schematic perspective view, partially broken away, ofa gas distribution apparatus in accordance with this invention, shown installed in a plasma-enhanced chemical vapor deposition system.
Figure 2 is a front plan view, partially broken away, of the gas distribution apparatus of Figure 1.
Figure 3 is a cross-sectional view taken along line 3-3 of Figure 2. Figure 4 is a cross-sectional view taken along line 4-4 of Figure 2. Figure 5 is a cross-sectional of a gas distribution apparatus in accordance with another embodiment of the invention.
DETAILED DESCRIPTION OF THE INVENTION Reference will now be made in detail to the preferred embodiment of the invention, which is illustrated in the accompanying figures. Turning now to the drawings, wherein like components are designated by like reference numerals throughout the various figures, attention is directed to Figure 1.
Figure 1 shows a gas distribution apparatus 10 which is particularly suitable for delivering a gaseous substance to a chamber 12 of processing system 14. Processing system 14 is used for plasma-enhanced chemical vapor deposition processing, although it is to be understood that the apparatus 10 may also be used with other processes on the wafer including, but not limited to, chemical vapor deposition, etching, high temperature film deposition, and the like. Processing system 14 generally includes a chamber wall 16 and a top plate 18 enclosing the chamber 12. A support assembly 20 supports a wafer 22 within the chamber 12 for processing. In the preferred embodiment, the support assembly 20 is an electrostatic clamp assembly of the type disclosed in co-pending application Serial No. (Flehr, Hohbach, Test, Albritton & Herbert File No. A-
62195/AJT/JEM), the disclosure of which is incorporated herein by reference. However, other types of support systems such as a mechanical clamping chuck may be used if desired. A plasma source 24 mounted to the top plate 18 and substantially axially aligned with the wafer 22 generates a supply of plasma for enhancing the processing of the wafer 22. Plasma source 24 is described in detail in co-pending application Serial No. (Flehr,
Hohbach, Test, Albritton & Herbert File No. A-62268/AJT), the disclosure of which is incorporated herein by reference.
Gas distribution apparatus 10 is mounted to the chamber wall 16 below the top plate 18. In the present embodiment, the distribution apparatus has an annular configuration with the outer peripheral surface 30 of the apparatus being mounted to the chamber wall and the inner surface 32 defining a central opening which extends through the distribution apparatus. A plurality of nozzles 34 inject gas into the processing chamber, with the gaseous substances traveling inwardly from the distribution apparatus toward the central axis of the chamber. The annular configuration of the gas distribution apparatus uniformly distributes the gases around the circumference of the chamber while providing a passageway between the plasma source 24 and the wafer 22. Separating the distribution apparatus 10 from the flow of plasma also provides for independent control over the
plasma density and the flow of the gaseous substances. As is indicated by the arrows in Figure 1, the plasma generated by the source 24 and the active species of the gaseous substance move downwardly onto the wafer surface in the RF field created between the distribution apparatus 10, chamber wall 16 and the support system 20, depositing a layer of film on the wafer.
Although the annular configuration of gas distribution apparatus 10 is preferred, it is to be understood that other configurations are within the scope of the invention. For example, the distribution apparatus may have a rectangular or oval configuration if desired. Instead of one apparatus which extends continuously around the circumference of the chamber, one or more arcuate distribution devices may be employed if desired.
Gas distribution apparatus 10 is of particular advantage in high-density, plasma enhanced processing because of the effects on the gas flow of factors such as the high density of the plasma, the low pressure of the processing chamber (less than 3-4 mTorr for high density plasma enhanced processes compared to more than 100 mTorr for conventional plasma-enhanced systems), and the relatively high energy of the electrons.
Because of the lower chamber pressure, the gaseous substances are moved by convection flow rather than free molecular flow.
Turning to Figures 2-4, the gas distribution apparatus 10 will be described in greater detail. Distribution apparatus 10 generally includes a plenum body 40 mounted to the wall 16 of the chamber 12. In the present embodiment, the plenum body 40 is supported on a horizontally-extending ledge 42 of the chamber wall 12. Threaded fasteners 44 distributed around the circumference ofthe plenum body extend through bores 45 formed in the plenum body and engage the chamber wall 16 to secure the plenum body to the chamber. The top plate 18 covers the plenum body and is secured to the chamber wall 16 as is known in the art. As is shown in Figure 1, the plenum body 40 is positioned immediately beneath the top plate 18 in the present embodiment, although it should be understood that the location of the plenum body is subject to considerable variation depending upon such factors as the design of the chamber 12, the type of processing employed and the nozzle design. Plenum body 40 has two parallel, circumferentially extending channels 46 and 48 formed in the plenum body. The channels 46 and 48 partially define a pair of plenums for receiving the gaseous substances employed in the processing of the wafer. Channels
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5
46 and 48 are each connected to a gas source 50, 52 through separate conduits 54 and 56 formed in the plenum body 40. For high density, plasma-enhanced chemical vapor deposition one channel is coupled to a source of oxygen and the other to a source of argon and silane. However, various other gaseous substances may be employed depending upon the processing employed in chamber 12. As is shown in Figures 2 and
3, the conduits 54 and 56 are L-shaped, extending outwardly and then downwardly through the plenum body 40 to intersect vertical supply lines 58 and 60 extending through the chamber wall 16. Conduits 54 and 56 are therefore circumferentially spaced around the plenum body 40. In other modifications of the inventions, the conduits may have other configurations and supply lines 58 and 60 may be replaced with lines which extend horizontally through the chamber wall 16.
In the present embodiment, plenum body 40 includes only one conduit for each channel although more than one conduit may be employed if desired. In other modifications of the invention, plenum body 40 may include two or more conduits evenly spaced about the circumference of the plenum body and oriented to tangentially inject the gaseous substance into the plenum with the gaseous substance from each plenum flowing through the channel in the same direction. Tangentially injecting the gaseous substance offers the advantage of improving the tangential uniformity of the surface profile because of the improved distribution of gas within the plenum. A baffle 62 formed with a plurality of openings (not shown) is mounted in each channel 46 and 48 as is known in the art. Baffles 62 interrupt the flow of gas from the conduits 54 and 56 to the directly-adjacent nozzles 34 to diffuse the gas and more uniformly distribute the flow of gas around the circumference of the plenum body 40. The configuration of the baffles 62 is selected to provide an optimum distribution of gas and is subject to considerable variation. Moreover, the baffle 62 may be omitted if desired.
A nozzle structure 70 is removably mounted to the plenum body 40, covering the channels 46 and 48 enclosing the plenums. The nozzle structure includes a plurality of first nozzles 34a substantially aligned with the channel 46 and a plurality of second nozzles 34b aligned with the channel 48 for injecting the gaseous substances retained in the plenums into the processing chamber. In the illustrated embodiment, the nozzles are integrally formed with the nozzle structure 70 by machining or other suitable means. In
other modifications of the invention, the nozzles may be mounted to the nozzle structure separately using threads, snap-fittings or other suitable securement means. The size, shape, spacing, angle and orientation of the nozzles is subject to considerable variation. In the present embodiment, the nozzles are uniformly spaced around the circumference of the nozzle structure 70, although if required the spacing may be varied to provide a more uniform distribution of gas. The nozzles are preferably configured to provide the layers formed on the wafer surface with a substantially flat profile. As is shown in Figure 2, the nozzles 34 are oriented at an angle in the range of 30° to 90° relative to the wafer plane. However, the nozzles may be oriented at other angles depending on the vertical distance separating the nozzle structure 70 and the wafer 22 and the desired deposition profile on the wafer.
As is shown in Figures 2 and 4, nozzle structure 70 includes an annular flange 74 for mounting the nozzle structure to the plenum body. A plurality of fasteners 76 engage the flange 74 and the plenum body 40 to securely mount the nozzle structure to the plenum body. A protective liner 78 formed of quartz or another suitable material extends across the annular flange 74 and plenum body to isolate the fastener 76 and the plenum body from the interior of the processing chamber. Seal rings 79 are compressed between the nozzle structure 70 and the plenum body 40 to isolate the plenums and prevent gas leakage between the plenums and between the plenums and the chamber 12. The seal rings are formed of a suitable material resistant to high temperatures such as Kalrez or
Chemraz, but Viton O-rings may also be employed for lower temperature processes.
The nozzle structure 70 may be conveniently removed from the plenum body by disengaging the fasteners 76 from the plenum body. Removing nozzle structure 70 facilitates cleaning and maintenance of the gas distribution apparatus 10. If desired, a second nozzle structure may be mounted to the plenum body 40 while the first is cleaned, allowing the wafer processing to continue without an expensive and time consuming delay. The second nozzle structure may have an entirely different nozzle configuration than the first if desired. The ability to conveniently remove the nozzle structure 70 improves the efficiency of the repair and maintenance of the gas distribution apparatus 10 and offers considerable flexibility in tailoring the nozzle design to a specific processing application.
When the distribution apparatus 10 is used with a plasma enhanced process as in the present embodiment, the nozzle structure 70 is exposed to a high potential RF energy field. As a result, gas distribution apparatus 10 is preferably grounded unless the nozzle structure 70 is formed of a dielectric material. Plenum body 40 and nozzle structure 70 include mating surfaces 80 and 81 which are formed to maximize the surface contact between the plenum body 40 and the nozzle structure 70 to couple the nozzle structure 70 to ground. The mating surfaces 80 and 81 are preferably plated with a suitable material such as nickel to enhance the surface-to-surface contact. The mating surfaces 80 and 81 also provide a return path for the RF current when the support assembly 20 applies an RF bias to the wafer. In other modifications of the invention, the junctures between the plenum body 40 and the nozzle structure 70 and the chamber wall 16 may be lined with a suitable dielectric material.
In the embodiment shown in the figures, the nozzle structure 70 is positioned radially inwardly of the plenum body 40. However, in other modifications the nozzle structure 70 may have other orientations relative to the plenum body. Moreover, the nozzle structure may be configured so that the injection points of the nozzles 34 are spaced a greater distance from the plenum body than is shown in Figures 2 and 3. The orientation and position of the nozzles relative to the wafer is subject to considerable variation within the scope of the present invention. Figure 5 shows another embodiment of a gas distribution apparatus 100 in accordance with the present invention. The distribution apparatus 100 includes a plenum body 102 formed with three circumferentially extending channels 104 each defining a separate plenum for receiving a gaseous substance. Each channel 104 is coupled to a separate horizontally-extending conduit 105 formed in the plenum body 102 for joining the channel 104 to a gas source (not shown). As is shown in Figure 5, the conduits 54 and 56 may be vertically aligned since the downward extending stretch of the uppermost conduit is omitted. The channels are enclosed by a nozzle structure 106 which includes a plurality of nozzles 108 associated with each channel 104 for injecting gaseous substances from the plenums into the chamber. As with the previously-described embodiment, the configuration of the nozzle structure 106 and the type, shape, size, number and spacing of nozzles 108 is subject to considerable variation within the scope of the invention.
With the embodiment shown in Figure 5, gas distribution apparatus 100 may be used to inject the same substance at two different flow rates. For example, one plenum may be coupled to a source of oxygen and the other two plenums may be coupled to source of argon and silane. The nozzles 108 may be arranged so that the nozzles of one of the two plenums are oriented to deliver the gaseous substance to the outer areas of the wafer and the nozzles of the other plenum are oriented to deliver the gaseous substance to the center areas of the wafer. The different nozzle orientations which provide different surface profiles which, when combined, result in a substantially flat deposition across the wafer surface. The gas distribution apparatus 100 also may be used to separately inject three different gaseous substances into the processing chamber or, if desired, one of the plenums may be sealed using a suitable capping device if only two plenums are required for a particular process.
Nozzle structure 106 is removably mounted to the plenum body 102 by a clamping device 110. Clamping device 110 includes a clamping plate 112 extending across the plenum body 102 and the outwardly extending flange 114 of the nozzle structure 106.
A fastener 116 engages the clamping plate 112 and the plenum body 102 to removably secure the clamping device 110 and the nozzle structure to the plenum body 102. A compliant spacing element 118 is preferably positioned between the clamping device 110 and the nozzle structure 106. A liner 120 formed of a suitable material such as quartz covers the clamping device and plenum body. The clamping device 110 is particularly suitable for use with nozzle structures 106 which are formed of brittle materials such as ceramic materials and quartz.
The plenum body 40 or 102 is preferably formed of aluminum or another suitable metal. The nozzle structure may be formed of a metal such as aluminum or a dielectric material such as a ceramic material, quartz or other dielectric material. The clamping device 110 is preferably formed of a metal such as aluminum, while the fasteners 76 or 116 and 44 are preferably formed of stainless steel.
The foregoing descriptions of specific embodiments of the present invention have been presented for purposes of illustration and description. They are not intended to be exhaustive or to limit the invention to the precise forms disclosed, and obviously many modifications and variations are possible in light of the above teaching. The embodiments were chosen and described in order to best explain the principles of the
invention and its practical application, to thereby enable others skilled in the art to best utilize the invention and various embodiments with various modifications as are suited to the particular use contemplated. It is intended that the scope of the invention be defined by the Claims appended hereto and their equivalents.
Claims
1. A gas distribution apparatus for delivering a gaseous substance to a chamber comprising: at least one plenum formed for receiving a gaseous substance, a plenum body mountable to said chamber and having at least one conduit formed therein, said conduit being coupled to said plenum for delivery of said gaseous substance to said plenum; and a nozzle structure removably mounted to said plenum body, said nozzle structure having a plurality of nozzles coupled to said plenum and configured for injection of said gaseous substance from said plenum to said chamber.
2. The gas distribution apparatus of Claim 1 in which said chamber includes a chamber wall having a top portion, a bottom portion and a side portion joining said top and bottom portions, and in which said plenum body is mountable to said side portion of said chamber wall.
3. The gas distribution apparatus of Claim 1 in which said plenum body has an outer surface defining a periphery of said plenum body and an inner surface defining a central opening extending through said plenum body, said outer surface being mountable to said chamber.
4. The gas distribution apparatus of Claim 1 in which said plenum body has an elongate channel formed therein, said channel partially defining said plenum.
5. The gas distribution apparatus of Claim 1, and further comprising a baffle disposed in said plenum for uniformly distributing said gaseous substance between said nozzles.
6. The gas distribution apparatus of Claim 1 , and further comprising a clamping device removably mounted to said plenum body, said clamping device extending across a portion of said nozzle structure to removably secure said nozzle structure to said plenum body.
7. The gas distribution apparatus of Claim 1, and further comprising a plurality of fastening configurations removably securing said nozzle structure to said plenum body.
8. The gas distribution apparatus of Claim 1 in which said nozzle structure is formed of a material selected from the group comprising ceramic materials, quartz, and metal materials.
9. The gas distribution apparatus of Claim 1 in which said plenum body is formed of a metal.
10. The gas distribution apparatus of Claim 1 in which said apparatus includes a plurality of plenums each formed for receiving a gaseous substance, said plenum body having at least one conduit coupled to each of said plenums and said nozzle structure having a plurality of nozzles coupled to each of said plenums.
11. The gas distribution apparatus of Claim 1, and further comprising a second plenum formed for receiving a second gaseous substance, said plenum body having at least one second conduit formed therein and coupled to said second plenum for delivery of a second gaseous substance to said plenum, said nozzle structure including a plurality of second nozzles coupled to said second plenum for injection of said second gaseous substance from said second plenum to said processing chamber.
12. An apparatus for injecting a gaseous substance into a processing chamber surrounded by a chamber wall comprising: at least one plenum for receiving a gaseous substance; a plenum body having an inner surface defining a central opening extending through said plenum body and a peripheral outer surface mountable to said chamber wall, said plenum body having at least one passageway formed therein and coupled to said plenum for delivery of said gaseous substance to said plenum; and a nozzle structure removably mounted to said plenum body, said nozzle having a plurality of nozzles coupled to said plenum for injecting said gaseous substance into said processing chamber.
13. The apparatus of Claim 12 in which said nozzle structure is removably mounted to said inner surface of said plenum body.
14. The apparatus of Claim 12 in which said plenum body has a substantially annular configuration.
15. The apparatus of Claim 12, and further comprising at least one additional plenum formed for receiving a gaseous substance, said plenum body including at least one additional passageway coupled to said additional plenum and said nozzle structure including a plurality of additional nozzles coupled to said additional plenum for injection of said gaseous substance from said additional plenum into said processing chamber.
16. The apparatus of Claim 12, and further comprising a clamping device removably mounted to said plenum body, said clamping device extending across a portion of said nozzle structure to removably secure said nozzle structure to said plenum body.
17. The apparatus of Claim 12, and further comprising a plurality of fastening configurations removably securing said nozzle structure to said plenum body.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US49986195A | 1995-07-10 | 1995-07-10 | |
US08/499,861 | 1995-07-10 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO1997003223A1 true WO1997003223A1 (en) | 1997-01-30 |
Family
ID=23987048
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/US1996/010657 WO1997003223A1 (en) | 1995-07-10 | 1996-06-21 | Gas distribution apparatus |
Country Status (2)
Country | Link |
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TW (1) | TW294820B (en) |
WO (1) | WO1997003223A1 (en) |
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