Patent Publication Number: US-8114477-B2

Title: Cleaning of a substrate support

Description:
CROSS-REFERENCE 
     This application is a divisional of U.S. patent application Ser. No. 10/888,798, filed on Jul. 9, 2004 now U.S. Pat. No. 7,655,316, entitled “CLEANING OF A SUBSTRATE SUPPORT,” which is assigned to Applied Materials, Inc. and is being incorporated by reference herein in its entirety. 
    
    
     BACKGROUND 
     Embodiments of the present invention relate to a method of fabricating a cleaning wafer for cleaning a surface of a substrate support. 
     In the fabrication of semiconductors and displays, material is formed or deposited on a substrate, such as a semiconductor wafer or dielectric, by processes such as chemical vapor deposition (CVD), physical vapor deposition (PVD), ion implantation, oxidation and nitridation. The material formed on the substrate can also be etched to define features of electric circuits and devices. Such processes are generally performed in a process chamber in which a plasma may be generated. The substrate is supported during these processes on a substrate support, such as an electrostatic chuck. The electrostatic chuck typically comprises a dielectric having a support surface that covers an electrode to which a voltage is applied. The applied voltage generates an electrostatic force that holds the substrate securely on the support surface during processing. An example of an electrostatic chuck is described in U.S. Pat. No. 6,563,686 to Tsai et al, filed on Mar. 19, 2001 and assigned to Applied Materials, which is herein incorporated by reference in its entirety. Other support surfaces in the chamber can comprise the surfaces of lift pins and substrate transports. The chamber also typically has enclosure walls about the substrate support, a gas distributor and exhaust, and a gas energizer. 
     In the processing of substrates, process residues can deposit on the surfaces of process kit parts such as shields. The process residues may be, for example, process by-products generated by etching or depositing material on the substrate. These process residues can accumulate on support surfaces, such as a substrate receiving surface of an electrostatic chuck, by “flaking off” from components such as the process kit and onto the support surface. Also, occasionally particles of silicon from wafer breaks in other chambers can be transported via the substrate transport into process chamber, and onto the surface of the electrostatic chuck. These particles and residues on the surface of the electrostatic chuck are undesirable, because they can reduce the magnitude of the electrostatic chucking force between the chuck and substrate. The reduced chucking force can cause slipping of the substrate on the electrostatic chuck during processing, and non-uniformity in the substrate processing results. Also, weakly held substrates may allow leakage of backside heat transfer gas, which can lead to non-uniform temperatures across the substrates. In some cases, large particles on the electrostatic chuck can even prevent the processing of further substrates, and can require venting of the process chamber to manually wipe the particles from the surface of the electrostatic chuck, which undesirably increases the chamber downtime and the cost of ownership. 
     In one version of a cleaning process, the surface of the support is rinsed in a cleaning solution to dissolve and wash away any residues the surface. However, conventional cleaning solutions can often erode chuck surfaces. Also, such processes can often require removal of the electrostatic chuck from the chamber, and venting of the chamber to atmospheric pressure, which can result in undesirable chamber downtime. 
     In another version, a dummy wafer is used to remove residues from the surface of the electrostatic chuck, as described for example in U.S. Pat. No. 5,746,928 to Yen et al., filed on Jun. 3, 1996, which is herein incorporated by reference in its entirety. In this version, the dummy wafer is placed on the chuck in a process chamber, and a voltage is applied to the chuck. Once the voltage is turned off, the dummy wafer is removed from the chuck along with debris and contamination that adhere to the backside of the dummy wafer. However, as the strength of adhesion of particles to the hard backside of the dummy wafer is limited, this method often does not provide sufficient cleaning of particles from the chuck surface, and may be especially problematic in the cleaning of larger particles. Also, such dummy wafers can also contaminate surfaces that are being cleaned by rubbing of the wafer material onto the surfaces. 
     Yet another version of a cleaning method is described in U.S. Pat. No. 5,671,119 to Huang et al, filed on Mar. 22, 1996, which is herein incorporated by reference in its entirety. In this version, a soft, particle adherent sheet is affixed to a dummy wafer, for example by vacuum grease, to assist in removing contaminant particles from an electrostatic chuck in an etching chamber. However, while the particles may exhibit improved adhesion to the soft sheet over the bare surface of the dummy wafer alone; this method still does not provide satisfactory results for the cleaning of support surfaces. In particular, the soft sheet attached by vacuum grease may not be suitable for the cleaning of process chambers that are typically operated at an ultra-high vacuum, such as deposition chambers operated at less than about 10 −7  barr (9.8×10 −7  atm), as the vacuum grease can contaminate the chamber. Also, the sheet held by the vacuum grease may not operate well at higher temperatures above room temperature, such as those typically used in processing chambers. Furthermore, the loosely held sheet may not adequately adhere to the dummy wafer, and it may be difficult to de-chuck the dummy wafer without also de-laminating the sheet. The poorly held sheet of material may also not provide sufficient electrostatic chucking forces between the chuck and dummy wafer, such that the layer is only weakly pressed against the particles on the surface of the chuck. Also, in general, the dummy wafers can have high particle counts and large numbers of chemical impurities. These particles and impurities can contaminate the soft sheets, for example during transport of the dummy wafers in close proximity to each other in cassettes. 
     Yet another version of a cleaning layer is described in WO 01/94036 to Namikawa et al, published on Dec. 13, 2001, which is herein incorporated by reference in its entirety. In this version, a cleaning sheet has a cleaning layer comprising a polymer on a base material, and is attached to a conveying member such as a semiconductor wafer by an adhesive layer. However, this embodiment is also problematic, as the adhesive layer can generate contamination in the process chamber, and the multiple layers of material can reduce the electrostatic chucking force. One or more of the multiple layers can also slip or de-laminate from the semiconductor wafer during the cleaning process, resulting in a poorer clean of the support surface. 
     SUMMARY 
     A method of fabricating a cleaning wafer capable of cleaning process residues from a substrate support surface is disclosed. The method comprises providing a cleaning disc, and applying a liquid polymer precursor to the cleaning disc by spraying or spin coating the liquid polymer precursor onto the disc to form a polymer precursor film on the disc. The polymer precursor film is cured to form a polymer layer having a cleaning surface. 
     In another version, the method comprises providing a cleaning disc and applying a liquid polyimide precursor to the cleaning disc by spraying or spin coating the liquid polyimide precursor onto the disc to form a polyimide precursor film on the disc. The polyimide precursor film is cured to form a polyimide layer having a cleaning surface. 
     In yet another version, the method comprises providing a silicon disc and spin coating a liquid polyimide layer onto the silicon disc to form a polyimide precursor film on the silicon disc. The polyimide precursor film is cured to form a polyimide layer having a cleaning surface. 
    
    
     
       DRAWINGS 
       These features, aspects, and advantages of the present invention will become better understood with regard to the following description, appended claims, and accompanying drawings, which illustrate examples of the invention. However, it is to be understood that each of the features can be used in the invention in general, not merely in the context of the particular drawings, and the invention includes any combination of these features, where: 
         FIG. 1  is sectional side view of an embodiment a cleaning wafer on a support surface of an electrostatic chuck; 
         FIG. 2  is sectional side view of another embodiment of a cleaning wafer; 
         FIG. 3  is a sectional side view of yet another embodiment of a cleaning wafer; and 
         FIG. 4  is a sectional side view of an embodiment of a chemical vapor deposition chamber having a support surface that can be cleaned by a cleaning wafer. 
     
    
    
     DESCRIPTION 
     A cleaning tool  20  for cleaning the surface  180  of a substrate support  100  comprises a cleaning wafer  22 , an embodiment of which is shown in  FIG. 1 . The cleaning wafer  22  may be suitable for cleaning a support  100  such as a vacuum chuck or an electrostatic chuck  108 , which has a dielectric material  109  over an electrode  145  to electrostatically hold a substrate  104  in a process chamber  106 . Other components that have support surface to support a substrate  104  may also be cleaned, such as for example a lift pin  152  or substrate transport  153 . The cleaning wafer  22  comprises a disc  24  that has a polymer layer  26  thereon with a cleaning surface  28  that is capable of cleaning process residues  30  from the support surface  180 . The cleaning surface  28  is desirably shaped and sized to substantially match a contour of the support surface  180 . For example, the cleaning surface  28  may be substantially planar to allow the surface  28  to lie flush against flat portions of a support surface  180  that contact the substrates  104 . Alternatively, the cleaning surface  28  may comprise ridges or furrows to match channels or pads in the support surface  180 . The cleaning surface  28  also comprises a diameter or width that is sized to substantially match a diameter or width of the support surface  180 , to allow good coverage of the support surface  180  by the cleaning surface  28 . 
     The disc  24  is desirably composed of a material that is suitable for supporting the layer  26  of cleaning material. For example, the disc  24  may comprise a dielectric or semiconducting material, such as at least one of aluminum oxide, quartz, silicon, and polycarbonate. The disc  24  may also comprise a metal material, such as at least one of aluminum, an aluminum alloy, stainless steel and titanium. In one version, the disc  24  comprises a particle grade high quality silicon wafer that provides reduced particle contamination in a process chamber  106 . The particle grade high quality silicon wafer may comprise, for example, less than about 50 particles having a size of at least about 0.2 microns on the surface  25  of the wafer. The particle grade high quality silicon wafer may also comprise a reduced level of metal contaminations, such as less than about 5×10 11  atoms/cm 2  of contaminant metal. While the cleaning wafer  22  may preferably comprise a disc  24  and polymer layer  26  having circular peripheries, it should be understood that the cleaning wafer  22  could also comprise other periphery shapes, such as square, triangular or rectangular shaped peripheries, to fit support surfaces  180  comprising more angular surfaces, such as support surfaces for flat panel displays. 
     The polymer layer  26  comprises a polymer having properties that promote the adhesion of process residues  30  to the cleaning surface  28 . For example, the polymer layer  26  may comprise a polymer having optimized characteristics such as an optimized elastic modulus, hardness, and surface energy, such that the polymer layer  26  is capable of picking up and retaining particles of process residue. Pressing the cleaning surface  28  of the cleaning wafer  22  against the support surface  180  at least partially embeds the process residues  30  in the relatively soft polymer layer  26 . When the cleaning wafer  22  is removed from the support surface  180 , the adhered process residues  30  are lifted off of the support surface  180  to provide a cleaned support surface  180 . In one version, a hardness of less than about 2 GPa and even less than about 1 GPa may be suitable, which can be measured by a hardness load and displacement indentation test, as described for example in  Review of Instrumented Indentation  in the  Journal of Research of the National Institute of Standards and Technology , Vol. 108, No. 4, July-August 2003, which is herein incorporated by reference in its entirety. Also, a suitable elastic modulus may be at least about 0.98 N/mm 2  as determined according to JIS K7127. In another version, the polymer layer  26  comprises a surface free energy of less than about 30 mJ/m 2 . Examples of properties that promote the adhesion of process residues and their measurements may be described in WO 01/94036 to Namikawa et al, published on Dec. 13, 2001, which is herein incorporated by reference in its entirety. 
     Yet another property that may be optimized is the heat resistance of the polymer layer  26 . For example, the composition and properties of the polymer layer  26  may be optimized to withstand temperatures of up to about 400° C. under a vacuum pressure, such as from about 25° C. and even from about 150° C. to about 400° C. The heat resistant polymer layer  26  is desirable because the polymer layer  26  can be used to clean the support surface  180  while maintaining higher chamber temperatures such as those used during processing. Thus, the higher cleaning temperatures allow the cleaning process to be performed substantially without requiring cycling of the chamber temperatures between different processing and cleaning temperatures. 
     In one version, the polymer layer  26  comprises one or more polyimide polymers, which have been found to be suitable for the cleaning of process residues  30 . Polyimides are polymers having an imide group (—CONRCO—) in the polymer chain, where R stands for H or a carbon containing group, such as a methyl group (CH 3 ) or aromatic ring. Examples of polyimides include linear polyimides and aromatic heterocyclic polyimides, such as Kapton® and Pyrelin®, commercially available from Du Pont High Performance Films, Circleville Ohio, U.S.A. Polyimides provide the desired adhesion properties for removing process residues, and also exhibit good erosion resistance in high heat and vacuum environments. 
     The polyimide layer  26  is desirably derived from a liquid polyimide precursor that is applied directly to a bottom surface  32  of the disc  24  to form a precursor film, substantially without an intervening adhesion layer. The directly applied liquid polyimide precursor hardens on the surface  32  to provide a secure bond between the disc  24  and polyimide layer  26 . The polyimide layer  26  can be formed by applying a liquid precursor comprising one or multiple types of polyimide precursors, and can also include other polymer precursors added to enhance the properties of the polyimide layer  26 . The liquid polyimide precursor film may also be cured to cross-link the polyimide precursor and form the hardened polyimide layer  26 , for example by heating the liquid polyimide precursor to a temperature of at least about 250° C. Other methods of curing can include exposing to the polyimide precursor to ultraviolet light or a chemical curing agent. In one version, the polyimide layer  26  can be formed by spin-coating a layer  26  of polyimide onto the surface  32 . In a spin-coating process, the liquid polyimide precursor is provided onto a surface and the surface is rotated to provide an even coating. Examples of polyimide spin-coating processes are described in U.S. Pat. No. 6,171,980 to Crabtree et al, assigned to NEC Electronics, Inc, and issued on Jan. 9, 2001, U.S. Pat. No. 5,238,878 to Shinohara, assigned to NEC Corporation and issued on Aug. 24, 1993, and U.S. Pat. No. 6,033,728 to Kikuchi et al, assigned to Fujitsu Limited and issued on Mar. 7, 2000, all of which are herein incorporated by reference in their entireties. In another version, a spraying method is used to spray-coat the liquid polyimide precursor directly onto the bottom surface  32  of the disc  24  to form a sprayed polyimide layer  26 . 
     The directly applied liquid polyimide precursor provides a polyimide layer  26  that provides good cleaning results even in high vacuum process chambers (less than about 10 −7  barr), substantially without contaminating the chambers. Also, because the liquid precursor is directly applied, a strong bond is formed between the disc  24  and resulting polyimide layer  26  that allows the layer  26  to be pressed more firmly into the support surface  180  during cleaning, substantially without de-lamination of the polyimide layer  26  upon removal of the cleaning wafer  22  from the surface  180 . Forming the polyimide layer  26  by applying the liquid polyimide precursor directly to the disc  24  also allows for the formation of a relatively thin polyimide layer  26  that provides good electrostatic attraction while also retaining particles of process residues  30 . The polymer layer  26  is desirably sufficiently thick to accommodate and retain process residues  30  that are pressed into the polymer layer  26  via the cleaning surface  28 , while also being sufficiently thin to provide good electrostatic attraction between the cleaning wafer  22  and electrostatic chuck  108 . A suitable thickness of the polymer layer  26  may be less than about 50 microns thick, such as from about 5 microns thick to about 50 microns thick, and even less than about 30 microns thick, such as from about 15 microns to about 20 microns thick. 
     In another version, the electrostatic attraction of the cleaning wafer  22  to the electrostatic chuck  108  can be increased to improve cleaning of the support surface  180 , by providing an electrode  34  about the polymer layer  26  as a part of the cleaning wafer  22 , as shown for example in  FIG. 2 . A high chucking force is generated between electrode  34  and an electrode in the electrostatic chuck  108  that attracts the cleaning wafer  22  to the support surface  180 , desirably with a force that is sufficient to embed the process residues  30  in the surface  28 . For example, a voltage may be applied to an electrode  145  in the electrostatic chuck  108  while the cleaning wafer  22  is on the support surface  180 , to generate electrostatic forces that electrostatically chuck the cleaning wafer  22  against the support surface  180 . The electrode  34  comprises a conductive material that is capable of being electrically charged to generate the electrostatic forces, such as for example at least one of aluminum, copper, titanium, nickel, chromium and zirconium. 
     In one version, the electrode  34  is at least partially embedded in the polymer layer  26 , as shown for example in  FIG. 2 . The electrode  34  can be formed by a suitable method, including deposition methods such as physical vapor deposition, electron vapor deposition, electroplating, screen printing and other methods as known to one of ordinary skill in the art. In one version, the electrode  34  comprises a metal layer  36 , and may even comprise a mesh electrode or wire grid that is embedded in the polymer layer  26 . In one version, the polymer layer  26  comprises first and second layers  26   a, b  of polymeric material. The first polymer layer  26   a  can be directly bonded to the disc  24  while the second polymer layer  26   b  comprises the cleaning surface  28 . The electrode  34  is formed in between the two layers  26   a, b  on a bottom surface  40  of the first polymer layer  26   a , and having the second polymer layer  26   b  formed on the electrode lower surface  42 . The thickness of the second polymer layer  26   b  is desirably relatively thin to provide adequate electrostatic biasing of the electrode  34 , such as a thickness of less than about 8 microns, and even a thickness of from about 2 to about 5 microns. The thickness of the first polymer layer  26   a  may be greater than that of the second polymer layer  26   b , and may be at least about 10 microns, such as from about 10 to about 15 microns. A suitable thickness of the electrode  34  may be from about 200 angstroms to about 1000 angstroms. 
     In yet another version, the electrode  34  can comprise a relatively thin metal layer  36  that is formed on the cleaning surface  28  of the polymer layer  26  (not shown). The metal layer  36  is desirably sufficiently thin that process residues are able to push through the metal layer  36  to become embedded in the polymer layer  26 . A suitable metal layer  36  may comprise a thickness of less than about 1000 angstroms and even less than about 500 angstroms, such as a thickness of from about 200 angstroms to about 500 angstroms. Upon electrostatic chucking, the metal layer  26  draws the bonded cleaning surface  28  towards the support surface  180 , thereby pressing process residues into the polymer layer  26  to clean the support surface  180 . Although preferred embodiments of the cleaning wafer  22  having the polymer layer  26  and electrode  34  are described and shown in  FIG. 2 , the cleaning wafer  22  may also comprise variations and combinations of these embodiments. For example, the cleaning wafer  22  may comprise more than one electrode  34  and can also comprise different arrangements of one or more polymer layers  26 . 
     In still another version, the polymer layer  26  may comprise a resistivity that is sufficiently low to act as a relatively leaky dielectric that aids in the chucking of the cleaning wafer  22  against the support surface  180 , and may also help in dissipating the chucking charge after cleaning. For example, a polymer layer  26  may be applied by a process that controls electrical properties of the polymer, such as the molecular connectivity of the polymer structure or polymer layer composition, to provide the desired lower resistivity. The polymer layer  26  may also be doped with an additive such as a metal, for example during the liquid precursor application process, to provide the desired resistivity. As another example, an additive comprising powdered graphite can be added to the liquid precursor to promote the conductivity of the polymer. In yet another example, the polymer layer  26  can comprise an ion implanted layer that is implanted with additives comprising metal ions to provide a higher conductivity. In one version, the polymer layer  26  may comprise a first layer  26   a  that has an additive that provides a desired lower resistivity, and a second layer  26   b  at the cleaning surface  28  that is substantially without the additive, to reduce contamination of the support surface  180  by the additive. A resistivity of the polymer layer  26  that may be sufficiently low to improve chucking of the cleaning wafer  22  against the support surface  180  may be a resistivity of less than about 10 12  Ohms·cm, such as from about 10 6  Ohms·cm to about 10 12  Ohms·cm. 
     In yet another version, a cleaning wafer  22  to clean process residues from a support surface  180  comprises a soft metal layer  46   a  with a metal cleaning surface  28  that is capable of picking up and retaining residues  30  from the surface  180  to clean the surface  180 , as shown for example in  FIG. 3 . This version may be particularly advantageous for cleaning supports  100  in process chambers  106  in which very high temperatures are maintained that may not desirable for the polymer layer  26 , such as temperatures above 400° C., and even above about 450° C. In this version, the soft metal layer  46   a  is formed on first side  48   a  of the disc  24 , such as on the bottom surface  32  of the disc  24 . A second metal layer  46   b  can also desirably be formed on the opposing side  48   b  of the disc  24 , such as on the top surface  33  of the disc  24 . The second metal layer  46   b  reduces the incidence of bowing or warping of the disc  24 , which could otherwise arise from thermal expansion mismatch between the first soft metal layer  46   a  and the disc  24 . Alternatively, the cleaning wafer  22  can be absent the second metal layer  46   b . The soft metal layer  46   a  desirably comprises a relatively small thickness that is sufficient to retain the process residues  30  on the cleaning surface  28 . For example, the soft metal layer  46   a  may comprise a thickness of from about 1 micrometer to about 10 micrometers. The second metal layer  46   b  may comprise the same or a substantially similar thickness, and desirably comprises the same composition as the first metal layer  46   a.    
     The soft metal layer  46   a  comprises one or more metals that are sufficiently soft to embed residues  30  in the cleaning surface  28 . For example, the metal layers  46   a, b  may comprise at least one of aluminum, copper and indium. The metal layer composition is desirably also selected with respect to metal contamination considerations. For example, an aluminum cleaning layer  46   a  may be provided in an aluminum deposition chamber, whereas a copper cleaning layer  46   a  may be provided in a copper deposition chamber. Thus, the cleaning wafer  22  comprising the metal layers  46   a, b  provides for the cleaning of residues  30  from support surfaces  180  even at higher temperatures. 
     In one version of a method of cleaning a support surface  180  with the cleaning wafer  22 , the cleaning wafer  22  is placed on the support surface  180  of an electrostatic chuck  108  inside a substrate processing chamber  106 . Gases in the chamber  106  are exhausted by pumping down to a vacuum pressure, such as a pressure of about 10 −7  barr (9.8×10 −7  atm), to remove potential contaminants from the chamber  106 . A temperature in the chamber  106 , such as a temperature of the substrate support  100 , may be maintained at from about 25° C. to about 400° C. A voltage is then applied from an electrode supply  143  to the electrode  145  in the electrostatic chuck  108  to press the cleaning surface  28  of the cleaning wafer  22  against the support surface  180 . In one version, the voltage is a DC voltage, such as a DC voltage of at least about 200 Volts, and even from about 200 to about 1000 Volts, such as from about 500 Volts to about 600 Volts. The voltage may also comprise, for example, an RF voltage. After a duration that is sufficient to adhere the residues  30  to the cleaning surface  28 , such as for example from about 0.5 minutes to about 5 minutes, the voltage is shut off. Alternatively, for a support  100  comprising a vacuum chuck, a vacuum pressure is applied that generates vacuum pressure forces on the cleaning surface  28  that pull the cleaning surface  28  into the vacuum chuck support surface  180 , and the cleaning wafer  22  is vacuum held on the chuck for a sufficient time to clean the surface  180 . The cleaning wafer  22  is removed from the support surface  180  along with the residues  30  adhered to the wafer  22 , to clean the support surface  180  of the process residues  30 . The cleaning process can be repeated as needed, and can also be combined with other cleaning steps, such as energized gas cleaning steps, to provide the desired removal of process residues. 
     The cleaning wafer  22  comprising the polyimide layer  26  formed by directly applying the liquid polyimide precursor provides improved cleaning over other cleaning methods, such as methods of cleaning with wafers that have multiple layers or adhesive layers, by providing good high temperature and high vacuum performance substantially without contaminating or damaging the support surface  180 . Accordingly, the improved cleaning wafer  22  allows for improved process performance and longer component life-time for substrate supports  100  such as electrostatic chucks  108 . 
     In one version, the cleaning wafer  22  cleans a support surface  180  that is a part of a process chamber  106  that is capable of performing a chemical vapor deposition process such as an HDP-CVD chamber, an embodiment of which is shown in  FIG. 4 . A version of an HDP-CVD chamber is also described in U.S. Pat. No. 6,559,026 to Rossman et al, issued May 6, 2003, which is herein incorporated by reference in its entirety. The HDP-CVD chamber shown in  FIG. 4  comprises enclosure walls  118 , which may comprise a ceiling  119 , sidewalls  121 , and a bottom wall  122  that enclose a process zone  113 . The enclosure walls  118  can comprise a domed ceiling  119  over the process zone  113 . A deposition gas can be introduced into the chamber  106  through a gas supply  130  that includes a deposition gas source  131 , and a gas distributor  132 . In the version shown in  FIG. 4 , the gas distributor  132  comprises one or more conduits  133  having one or more gas flow valves  134   a, b  and one or more gas outlets  135   a  around a periphery of the substrate  104 , as well as one or more outlets  135   b, c  above the substrate  104  to provide an optimized flow of deposition gas in the chamber  106 . The deposition gas can comprise, for example, one or more of SiH 4  and O 2 . An electrode  145  in an electrostatic chuck  108  of a substrate support  100  may be powered by an electrode power supply  143  to electrostatically hold a substrate on the support surface  180  during processing, or to press the cleaning surface  28  of a cleaning wafer  22  against the support surface  180  during cleaning of the surface  180 . Spent process gas and process byproducts are exhausted from the chamber  106  through an exhaust  120  which may include an exhaust conduit  127  that receives spent process gas from the process zone  113 , a throttle valve  129  to control the pressure of process gas in the chamber  106 , and one or more exhaust pumps  140 . 
     In one version, the support  100  also comprises a process kit  124  comprising one or more rings, such as a cover ring  126  and a collar ring  128  that covers at least a portion of the upper surface of the support  100  to inhibit erosion of the support  100 . In one version, the collar ring  128  at least partially surrounds the substrate  104  to protect portions of the support  100  not covered by the substrate  104 . The cover ring  126  encircles and covers at least a portion of the collar ring  128 , and reduces the deposition of particles onto both the collar ring  128  and the underlying support  100 . A lift pin assembly  154  and substrate transport  153  can also be provided to position the substrate  104  on a substrate receiving surface  180  of the support  100 . The lift pin assembly  154  comprises a plurality of lift pins  152  adapted to contact the underside of the substrate  104  to lift and lower the substrate  104  onto the substrate receiving surface  180 . The substrate transport  153  is adapted to transport substrates  104  in and out of the process chamber  106 . 
     In one version, the deposition gas may be energized to process the substrate  104  by a gas energizer  116  comprising an antenna  117  having one or more inductor coils  111   a, b  which may have a circular symmetry about the center of the chamber to couple energy to the process gas in the process zone  113  of the chamber  106 . For example, the antenna  117  may comprise a first inductor coil  111   a  about a top portion of the domed ceiling  119  of the chamber  106 , and a second inductor coil  111   b  about a side portion of the domed ceiling  119 . The inductor coils may be separately powered by first and second RF power supplies  142   a, b . The gas energizer  116  may also comprise one or more process electrodes that may be powered to energize the process gas. A remote chamber  147  may also be provided to energize a process gas, such as a cleaning gas, in a remote zone  146 . The process gas can be energized by a remote zone power supply  149 , such as a microwave power supply, and the energized gas can be delivered via a conduit  148  having a flow valve  134   c  to the chamber  106 , for example to clean the chamber. 
     To process a substrate  104 , the process chamber  106  is evacuated and maintained at a predetermined sub-atmospheric pressure. The substrate  104  is then provided on the support  100  by a substrate transport  153 , such as for example a robot arm, and lift pin assembly  154 . The substrate  104  may be held on the support  100  by applying a voltage to an electrode in the support  100  via an electrode power supply  143 . The gas supply  130  provides a process gas to the chamber  106  and the gas energizer  116  couples RF or microwave energy to the process gas to energize the gas to process the substrate  104 . Effluent generated during the chamber process is exhausted from the chamber  106  by the exhaust  120 . 
     The chamber  106  can be controlled by a controller  194  that comprises program code having instruction sets to operate components of the chamber  106  to process substrates  104  in the chamber  106 . For example, the controller  194  can comprise a substrate positioning instruction set to operate one or more of the substrate support  100  and substrate transport  153  and lift pins  152  to position a substrate  104  or cleaning wafer  22  in the chamber  106 ; a gas flow control instruction set to operate the gas supply  130  and flow control valves to set a flow of gas to the chamber  106 ; a gas pressure control instruction set to operate the exhaust  120  and throttle valve to maintain a pressure in the chamber  106 ; a gas energizer control instruction set to operate the gas energizer  116  to set a gas energizing power level; a temperature control instruction set to control temperatures in the chamber  106 ; a cleaning control instruction set to set a voltage applied to the electrode  145  to generate an electrostatic force to press the cleaning wafer  22  against the support surface  180 ; and a process monitoring instruction set to monitor the process in the chamber  106 . 
     Although exemplary embodiments of the present invention are shown and described, those of ordinary skill in the art may devise other embodiments which incorporate the present invention, and which are also within the scope of the present invention. For example, other polymer layer and electrode compositions and arrangements may be provided other than those specifically shown. Also, the cleaning wafer  22  may clean support surfaces  180  in process chambers other than that described. Furthermore, relative or positional terms shown with respect to the exemplary embodiments are interchangeable. Therefore, the appended claims should not be limited to the descriptions of the preferred versions, materials, or spatial arrangements described herein to illustrate the invention.