Abstract:
A method and apparatus for a substrate support system for a substrate process chamber, the chamber comprising a chamber body enclosing a processing region, a primary substrate support and a secondary substrate support at least partially disposed in the processing region, the secondary substrate support circumscribing the primary substrate support, wherein one or both of the primary substrate support and the secondary substrate support are movable relative to each other, and the primary substrate support is rotatable relative to the secondary substrate support.

Description:
CROSS-REFERENCE TO RELATED APPLICATION 
       [0001]    This application claims the benefit of U.S. Provisional Patent Application Ser. No. 61/872,545 (Attorney Docket No. 021062USAL), filed Aug. 30, 2013, which is hereby incorporated by reference in its entirety. 
     
    
     BACKGROUND 
       [0002]    1. Field 
         [0003]    Embodiments of the disclosure generally relate to a substrate support system for a process chamber. More particularly, embodiments described herein relate to a substrate support system wherein non-uniformities measured on a substrate may be averaged (i.e., moved closer to a norm) by one or a combination of moving the substrate relative to a pedestal or moving the pedestal relative to the substrate using the substrate support system. 
         [0004]    2. Description of the Related Art 
         [0005]    Integrated circuits have evolved into complex devices that can include millions of components (e.g., transistors, capacitors, resistors, and the like) on a single chip. The evolution of chip designs continually requires faster circuitry and greater circuit density. The demands for greater circuit density necessitate a reduction in the dimensions of the integrated circuit components. The minimal dimensions of features of such devices are commonly referred to in the art as critical dimensions. The critical dimensions generally include the minimal widths of the features, such as lines, columns, openings, spaces between the lines, and device/film thickness and the like. As these critical dimensions shrink, accurate measurement and process control becomes more difficult. 
         [0006]    Formation of these components is performed in a controlled environment, such as a process chamber, wherein a substrate is transferred for processing. The process chamber typically includes a pedestal that supports the substrate during the formation. The pedestal may be heated, cooled, function as an electrode, capable of rotation and/or vertical displacement and/or angular displacement, and combinations thereof. The heating, cooling, and/or electrical bias (collectively “substrate processing properties”) should be uniform across the face of the substrate in order to facilitate uniform conditions and thus uniform processing (e.g., deposition, etch, and other processes) across the substrate. 
         [0007]    However, the pedestal may not perform reliably in order to deliver satisfactory substrate processing properties measured on the substrate. As one example, temperature of the pedestal may be non-uniform which results in non-uniform temperatures across the substrate. While the pedestal may include zones having individual temperature control means, the pedestal may not be capable of delivering thermal energy efficiently across the entire surface area of the substrate. Thus, one or more regions of the substrate may be at a different temperature than other regions of the substrate which results in non-uniform temperatures and non-uniform processing of the substrate. The possibility of non-uniformity may also be extended to other substrate processing properties such as radio frequency (RF) or direct current (DC) application for plasma processes, and other functions the pedestal may provide during substrate processing. 
         [0008]    Therefore, there is a need in the art for a substrate support system capable of minimizing non-uniformities in substrate processing properties in the manufacture of integrated circuits. 
       SUMMARY 
       [0009]    The present disclosure generally relates to a method and apparatus for a substrate support system utilized in a substrate process chamber. In one embodiment, a process chamber is provided. The chamber includes a chamber body enclosing a processing region, a primary substrate support and a secondary substrate support at least partially disposed in the processing region, the secondary substrate support circumscribing the primary substrate support, wherein one or both of the primary substrate support and the secondary substrate support are movable relative to each other, and the primary substrate support is rotatable relative to the secondary substrate support. 
         [0010]    In another embodiment, a substrate process chamber is provided. The chamber includes a chamber body enclosing a processing region, a pedestal disposed in the processing region for supporting a major surface of a substrate, and an edge support member disposed in the processing region for intermittently supporting an edge of the substrate when the major surface of the substrate is not supported by the pedestal, wherein the pedestal is rotatable relative to the edge support member. 
         [0011]    In another embodiment, a method for compensating for non-uniformities of substrate processing properties during a substrate manufacturing process is provided. The method includes transferring a substrate to a pedestal disposed in a processing chamber, positioning the substrate at a first position on a support surface of the pedestal, processing the substrate while monitoring a substrate processing property on the substrate, and re-positioning the substrate on the support surface to a second position that is different than the first position when the substrate processing property is outside a desired value. 
     
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         [0012]    So that the manner in which the above recited features of the present disclosure can be understood in detail, a more particular description of the disclosure, briefly summarized above, may be had by reference to embodiments, some of which are illustrated in the appended drawings. It is to be noted, however, that the appended drawings illustrate only typical embodiments of this disclosure and are therefore not to be considered limiting of its scope, for the disclosure may admit to other equally effective embodiments. 
           [0013]      FIG. 1  is a side cross-sectional view of a process chamber having one embodiment of a substrate support system disposed therein. 
           [0014]      FIG. 2  is a side cross-sectional view of a process chamber having another embodiment of a substrate support system disposed therein. 
           [0015]      FIG. 3  is a plan view of the pedestal of  FIG. 2 . 
           [0016]      FIG. 4  is a cross-sectional view of a portion of a pedestal showing another embodiment of a secondary substrate support. 
           [0017]      FIG. 5  is a flow chart showing a method utilizing the substrate support system as described herein. 
       
    
    
       [0018]    To facilitate understanding, identical reference numerals have been used, wherever possible, to designate identical elements that are common to the figures. It is also contemplated that elements disclosed in one embodiment may be beneficially utilized on other embodiments without specific recitation. 
       DETAILED DESCRIPTION 
       [0019]    Embodiments described herein relate to a substrate support system and associated method for compensating for differences in temperature, electrical bias, electromagnetic energy distribution, or other non-uniformity which may affect uniform processing results on a substrate supported by a pedestal in a process chamber. The temperature, electrical bias, electromagnetic energy distribution, or other non-uniform phenomena that may affect uniform processing results on the substrate supported by the pedestal during processing are collectively referred to as substrate processing properties Correction of non-uniform substrate processing properties provide process control parameters on the substrate during processing. The non-uniformities may be detected by monitoring of the substrate during processing, observation of the azimuthal uniformity of a processed substrate, and combinations thereof. The inventive system and method may provide reduction of non-uniformities within one or more of these substrate processing properties, which provides more efficient process control during formation of structures on the substrate. 
         [0020]      FIG. 1  is a side cross-sectional view of a process chamber  100  having one embodiment of a substrate support system  102  disposed therein. The process chamber  100  includes a chamber body  104  consisting of a sidewall  103 , a bottom  105  and a lid assembly  106  that encloses a process volume  108 . The substrate support system  102  is at least partially disposed in the process volume  108  and supports a substrate  110  that has been transferred to the process volume  108  through a port  112  formed in the chamber body  104 . 
         [0021]    The substrate support system  102  includes a primary substrate support  113 , such as a pedestal  114 , and a secondary substrate support  115 , such as an edge supporting member  116 . The secondary substrate support  115  may be used to intermittently support the substrate  110  above the primary substrate support  113 . For example, the substrate  110  is shown on the edge supporting member  116  in a spaced apart from the pedestal  114  in  FIG. 1 . The substrate  110  would be in proximity to, or in contact with, the pedestal  114  during processing. For example, the pedestal  114  includes a support surface  118  that is adapted to contact (or be in proximity to) a major surface of the substrate  110  during processing. Thus, the pedestal  114  serves as a primary supporting structure for the substrate  110  in the process chamber  100 . 
         [0022]    At least one of the pedestal  114  and the edge supporting member  116  is movable relative to the other. In the processing position, the edge supporting member  116  would be in proximity to the pedestal  114  and may circumscribe (i.e., surround) the pedestal  114  such that a lower surface of the substrate  110  would be supported by the pedestal  114 . In one embodiment, the pedestal  114  may be capable of movement relative to the edge supporting member  116 . In one example, the edge supporting member  116  may be fixed at least in the X-Z (horizontal) plane, as well as rotationally, and the pedestal  114  is coupled to an actuator  126 A via a shaft  121  that provides one or a combination of vertical movement (in the Z direction), rotational movement (about axis A), and may also provide angular movement (relative to axis A). Vertical movement may be provided by the actuator  126 A to allow the substrate  110  to be transferred from the edge supporting member  116  to the support surface  118 . In another embodiment, the edge supporting member  116  may be coupled to an actuator  126 B via one or more support members (described in more detail below) that provides at least vertical movement (Z direction) of the edge supporting member  116 . Thus, the edge supporting member  116  may move relative to the pedestal  114 . Vertical movement may be provided by the actuator  1268  to allow the edge supporting member  116  to be lowered and transfer the substrate  110  to the support surface  118 . In another embodiment, a combination of movement provided by the actuators  126 A and  1268  may be provided to facilitate transfer of the substrate  110  between the support surface  118  and the edge supporting member  116 . 
         [0023]    The process chamber  100  may be a deposition chamber, an etch chamber, an ion implant chamber, a plasma treatment chamber, or a thermal process chamber, among others. In the embodiment shown, the process chamber is a deposition chamber and includes a showerhead assembly  128 . The process volume  108  may be in selective fluid communication with a vacuum system  130  to control pressures therein. The showerhead assembly  128  may be coupled to a process gas source  132  to provide process gases to the process volume  108  for depositing materials onto the substrate  110 . The showerhead assembly  128  may also include a temperature control element  134  for controlling the temperature of the showerhead assembly  128 . The temperature control element  134  may be a fluid channel that is in fluid communication with a coolant source  136 . 
         [0024]    The edge supporting member  116  functions as a temporary substrate support member. The edge supporting member  116  is utilized for supporting the substrate  110  in a spaced-apart relation to the support surface  118  of the pedestal  114  as necessary (as shown in  FIG. 1 ), which may facilitate repositioning of the substrate  110  relative to the support surface  118  of the pedestal  114  when desired. The edge supporting member  116  may include recesses or slots  133  formed therein that are sized to receive a robot blade  109  to facilitate robotic substrate transfer into and out of the process volume  108 . 
         [0025]    The pedestal  114  may include at least one embedded temperature control element  120  disposed within a pedestal body  122 . In one embodiment, the embedded temperature control element  120  may be a heating or cooling element or channel, utilized to apply thermal energy to the pedestal body  122  that is absorbed by the substrate  110 . Other elements may be disposed on or embedded within the pedestal body  122 , such as one or more electrodes and/or vacuum ports. The temperature of the substrate  110  may be monitored by one or more sensors  124 . The embedded temperature control element  120  may be zone controlled such that temperature at different areas of the pedestal body  122  may be individually heated or cooled. However, due to extenuating factors, such as imperfections in the pedestal  114  and/or non-uniformities in the substrate  110 , the embedded temperature control element  120  may not be able to apply thermal energy uniformly across the entire support surface  118  and/or the substrate  110 . These extenuating factors create non-uniform temperature of the substrate  110  which results in non-uniform processing of the substrate. 
         [0026]    To counter the thermal non-uniformity that may be present on the surface of the substrate  110  (which may be determined by monitoring temperature of the substrate  110 ), the substrate  110  may be repositioned relative to the support surface  118 . The hot or cold spots present on the surface of the substrate  110  are indicative of hot or cold spots in or on the support surface  118  of the pedestal body  122 . In one example, the substrate is transferred from the support surface  118  to the edge supporting member  116  by one or a combination of movement provided by the actuators  126 A and  126 B. The edge supporting member  116  temporarily supports the substrate  110  in a spaced-apart relation above the pedestal  114  as shown, which allows rotation of the pedestal  114  relative to the substrate  110 . This movement may be utilized to relocate hot or cold spots present in or on the support surface  118  of the pedestal body  122  (as determined by monitoring the temperature of the substrate  110 ). The pedestal  114  may be rotated in an angular displacement that is less than about 360 degrees, for example less than about 180 degrees, such as between about 1 degree to less than about 180 degrees, or increments therebetween. After relocation of the hot or cold spots in or on the support surface  118  of the pedestal body  122  by rotating the pedestal  114 , the substrate  110  may be replaced onto the support surface  118  of the pedestal  114  by one or a combination of movement provided by the actuators  126 A and  1268 . Once replacement of the substrate  110  is completed, cold spots on the substrate  110  may be positioned closer to hot spots on the support surface  118  of the pedestal  114 , and vice versa. Thus, any localized non-uniform temperature distribution on the surface of the substrate  110  is averaged providing a substantial even temperature distribution across the entire substrate (i.e., +/− a few degrees Celsius). 
         [0027]    In another embodiment, the pedestal  114  may be an electrostatic chuck and the pedestal  114  may include one or more electrodes  121 . For example, the pedestal  114  may be coupled to a power element  140  that may be a voltage source providing power to the one or more electrodes  121 . The voltage source may be a radio frequency (RF) controller or a direct current (DC) controller. In another example, the pedestal  114  may be made of a conductive material and function as a ground path for RF power from a power element  1408  distributed by the showerhead assembly  128 . Thus, the process chamber  100  may perform a deposition or etch process utilizing RF or DC plasmas. As these types of plasmas may not be perfectly concentric or symmetrical, RF or DC hot spots (i.e., electromagnetic hot spots) may be present on the substrate  110 . These electromagnetic hot spots may create non-uniform deposition or non-uniform etch rates on the surface of the substrate  110 . 
         [0028]    To counter the electromagnetic hot spots that may be present on the surface of the substrate  110  (which may be determined by observing the plasma sheath), the substrate  110  may be repositioned relative to the support surface  118  using the edge supporting member  116  according to the process described above. For example, a non-uniform plasma sheath may indicate non-uniform energy distribution in the plasma. The repositioning of the substrate  110  is utilized to redistribute any electromagnetic hot spots, and any localized non-uniform energy distribution on the surface of the substrate  110  is averaged thus providing an equilibrated energy distribution across the substrate. 
         [0029]    During processing in a deposition or etch process, the pedestal  114  is typically rotated. However, any anomalies in temperature distribution, electrical bias or electromagnetic energy distribution determined to be present on the substrate  110  are fixed as the position of the substrate  110  is fixed relative to the support surface  118 . However, movement of the substrate  110  relative to the support surface  118  compensates for these differences in temperature, electrical bias, electromagnetic energy distribution by averaging these differences which results in substantially uniform temperature distribution, electrical bias or electromagnetic energy distribution on the substrate  110 . 
         [0030]    In one embodiment, in addition to the pedestal  114 , the substrate support system  102  includes the edge supporting member  116  that is supported by one or more pins  142 . At least one of the one or more pins  142  may be coupled directly to a linear drive  144  or coupled to a lift ring  146  as shown. Further, the edge supporting member  116  may be a deposition ring providing a shielding function when not used to support the substrate  110 . For example, when the substrate  110  is supported by the support surface  118  of the pedestal  114 , and the edge supporting member  116  at least partially surrounds the pedestal  114 , the edge supporting member  116  may shield chamber components from deposition or etch by-products. In one embodiment, the edge supporting member  116  may remain in partial contact with the substrate  110  during processing of the substrate  110 . In one aspect, the edge supporting member  116  may be utilized to support the perimeter of the substrate  110  during processing (when the pedestal  114  is not rotated during processing). In another aspect, the edge supporting member  116  may be made of a conductive material that may be used to provide an electrical bias to the substrate  110  in a plating process, for example. While the edge supporting member  116  is shown coupled to the actuator  126 B providing movement thereof relative to the pedestal  114 , the edge supporting member  116  may simply rest on an upper surface of the pins  142 . In this embodiment, the pedestal  114  may move relative to the edge supporting member  116  allowing the substrate  110  to be transferred to the support surface  118 . Continuing movement of the pedestal  114  in the Z direction would then allow the edge supporting member  116  to be supported by a peripheral shoulder region  147  formed in the pedestal  114 . As the edge supporting member  116  is raised above the height of the pins  142  allowing rotational movement of the pedestal  114 , the substrate  110  and the edge supporting member  116 . 
         [0031]      FIG. 2  is a side cross-sectional view of a process chamber  100  having another embodiment of a substrate support system  202  disposed therein. As in the embodiments described in  FIG. 1 , the substrate support system  202  includes a pedestal  114  and the actuator  126 A as well as the associated lift and sealing members. However, in this embodiment, a secondary substrate support  203  of the substrate support system  202  includes a plurality of edge support members  204  in place of the edge supporting member  116  shown in  FIG. 1 . The edge support members  204  may be discrete fingers that selectively support the edge of the substrate  110  when in use. In this embodiment, the pedestal  114  includes a cutout region  206  corresponding to each of the edge support members  204 . Each cutout region  206  allows the respective edge support members  204  to clear a bottom surface  208  of the pedestal  114  to allow free rotation of the pedestal  114  when the substrate  110  is supported on the support surface  118  thereof. Lifting and lowering of the edge support members  204  may be accomplished by the actuator  126 B, the lift ring  146 , and associated pins  142 . 
         [0032]      FIG. 3  is a plan view of the pedestal  114  of  FIG. 2 . Three edge support members  204  are shown in respective cutout regions  206 . Each of the cutout regions  206  of the pedestal  114  may be aligned with each of the edge support members  204  when the edge support members  204  are utilized to space the substrate  110  away from the support surface  118  of the pedestal  114  by use of an encoder or other rotational sensing/indexing metric coupled to the pedestal  114  and/or the actuator  216 A (shown in  FIG. 2 ). While only three edge support members  204  are shown, the secondary substrate support  203  may include at least two edge support members  204  and more than three edge support members  204 . The number of edge support members  204  may coincide with a corresponding number of cutout regions  206 . Optionally or additionally, additional cutout regions  206  (shown in phantom) may be added to the pedestal  114 . The cutout regions  206  may be utilized as necessary to provide rotation of the pedestal  114  in 120 degree increments, 60 degree increments, 30 degree increments, as well as less than 30 degree increments, while facilitating alignment with the edge support members  204 . Additional cutout regions  206  may also be added to facilitate alignment with the edge support members  204  at increments greater than 120 degrees. 
         [0033]      FIG. 4  is a cross-sectional view of a portion of a pedestal  114  showing another embodiment of a secondary substrate support  400 . In this embodiment, an edge support member  204  is coupled to a pin  142  that is coupled to an actuator  405 . Similar to other embodiments, the actuator  405  is utilized to raise and lower the substrate  110  relative to the pedestal  114  in the Z direction. However, in this embodiment the actuator  405  is utilized to move the edge support member  204  laterally (in the X direction) relative to the pedestal  114 . While not shown, other pins  142  and edge support members  204  may be disposed about the periphery of the pedestal  114  similar to the embodiment described in  FIG. 2 . In this embodiment, an actuator  405  may be necessary for each of the edge support members  204 . 
         [0034]      FIG. 5  is a flow chart showing a method  500  of compensating for non-uniformities of substrate processing properties during a substrate manufacturing process. The method  500  may be practiced utilizing the substrate support system  102  or  202  as described herein, or other suitable apparatus. The method  500  includes, at block  505 , transferring a substrate  110  to a pedestal  114  in a process chamber  100 . The method at block  505  may also include transferring the substrate  110  into the process chamber  100  on a robot blade  109  and transferring the substrate from the robot blade  109  to the secondary substrate support. In the embodiment of  FIG. 1 , the transfer included at block  505  also includes aligning the edge supporting member  116 , particularly the slots  133 , in a plane configured to receive the robot blade  109  which would extend through the transfer port  112 . Once the substrate  110  is substantially concentric with the edge supporting member  116 , the robot blade  109  may be retracted from the process chamber  100  through the transfer port  112 . In the embodiment of  FIG. 2  or  4  where the edge support members  204  are utilized, the transfer described at block  505  includes positioning the substrate  110  above the pedestal  114 , substantially concentric with the pedestal  114 , and above the area defined by a circumference of the edge support members  204 . The actuator  126 B (shown in  FIG. 2 ) or the actuator  405  (shown in  FIG. 4 ) may then be used to move the edge support members  204  into proximity with the edge of the substrate  110 . In this embodiment, the edge support members  204  may be spaced to not interfere with the travel path of the robot blade  109 . Once the edge support members  204  grip the edge of the substrate  110  the substrate  110  may be lifted off the robot blade  109  and the robot blade  109  may be retracted. 
         [0035]    At block  510 , the substrate  110  is lowered onto the support surface  118  of the pedestal  114  using either the edge supporting member  116  of  FIG. 1  or the edge support members  204  of  FIGS. 2 and 4 . The substrate  110  may be positioned in a first position on the support surface  118  of the pedestal  114 . In the embodiment of  FIG. 1 , the edge supporting member  116  may be lowered until the support surface  118  of the pedestal  114  is at least partially supporting the substrate  110  and may be further lowered to be proximate the peripheral shoulder region  147 . In the embodiment of  FIG. 2 , the edge support members  204  may be lowered until the support surface  118  of the pedestal  114  is at least partially supporting the substrate  110  and may be further lowered to clear the bottom surface  208  of the pedestal  114 . In the embodiment of  FIG. 4 , the edge support members  204  may be actuated in the X direction to clear the sidewall of the pedestal  114 . In any of these embodiments, a major surface (e.g., the bottom or backside) of the substrate  110  is supported by the support surface  118  of the pedestal  114  and the substrate  110  may be processed. 
         [0036]    At block  515 , as the major surface of the substrate  110  is supported by the pedestal  114 , the pedestal  114 , and the substrate  110  supported thereon, may be rotated, raised, lowered, and combinations thereof, in order to process the substrate  110 . For example, deposition or etch processes using gases or plasmas thereof that may be generated in the process chamber  100  as the substrate  110  is supported on the pedestal  114 . Processing of the substrate  110  may include raising or lowering the pedestal  114  relative to the showerhead assembly  128 . Processing of the substrate  110  may also include rotation of the pedestal  114 . 
         [0037]    At block  520 , the process performed on the substrate  110  is monitored. Metrics such as substrate temperature, electrical bias and/or electromagnetic energy distribution (i.e., substrate processing properties) may be monitored across the surface of the substrate  110  to determine any non-uniformities thereof that are determined to be outside of desired parameters or a target value. The desired parameters or target value may include substrate temperature, electrical bias and/or electromagnetic energy distribution on the substrate  110  being within a narrow range (i.e., window) of process parameters. With respect to temperature, the desired parameter or target value may include a temperature that varies within a few degrees Celsius. If the metrics indicate uniform conditions (i.e., within desired parameters or a target value) the processing of the substrate  110  may continue. If non-uniformities (i.e., metrics outside of desired parameters or a target value) are present, the method progresses to block  525  which includes repositioning the substrate  110  on the support surface  118  of the pedestal  114 . 
         [0038]    The in-situ process described at block  520  may be optional. Monitoring of processed substrates may be used with the method  500  to determine the presence of non-uniformities. This ex-situ monitoring may be utilized to determine positioning parameters for processing subsequent substrates using a specific recipe. For example, ex-situ monitoring may be utilized to determine the angle of rotation of the pedestal  114 , the amount (i.e., number) of repositioning(s) of the substrate  110  on the pedestal  114 , the timing of repositioning(s) of the substrate  110  on the pedestal  114 , and combinations thereof. Thus, once the non-uniformities are determined, either by the in-situ process described at block  520  and/or the ex-situ monitoring, the monitoring may be suspended for a particular manufacturing scheme. 
         [0039]    At block  525 , in the embodiment of  FIG. 1 , the edge supporting member  116  of  FIG. 1  is used to support the substrate  110  while the substrate  110  is spaced away from the support surface  118  of the pedestal  114 . In this spaced-apart relation the pedestal  114  may be rotated at some increment less than about 360 degrees. In the embodiment of  FIGS. 2 and 4 , the edge support members  204  are used to support the substrate  110  and move the substrate  110  away from the support surface  118  of the pedestal  114  allowing the pedestal  114  to rotate at some increment less than about 360 degrees. After the rotation of the pedestal  114 , the substrate  110  may be again placed onto the support surface  118  of the pedestal  114  as described at block  510 . Processing as described at block  515  may continue. During processing, the process may be monitored as described at block  520  and block  525 , followed by block  515 , may be repeated as necessary until processing is completed. When processing is completed, the substrate  110  may then be transferred out of the process chamber  100  by spacing the substrate  110  from the support surface  118  of the pedestal  114  as described at block  525 , and a process of transferring the substrate  110  from the edge supporting member  116  ( FIG. 1 ) or the edge support members  204  ( FIGS. 2 and 4 ) to the robot blade  109 . The transfer of the substrate  110  to the robot blade  109  may be the substantial reverse of the process described at block  505 . 
         [0040]    Embodiments of the substrate support system  102  or  202  enable an in-situ (intra-chamber) process for compensating for non-uniformities in substrate processing properties. The inventive substrate support system  102  or  202  as described herein may reduce costs and increase throughput as the substrate processing properties may be compensated without removal of the substrate from the process chamber and/or breaking of vacuum in order to use a robot blade (or other peripheral substrate support mechanism) to temporarily support the substrate. Additionally, device quality and/or device yield may be enhanced since the non-uniformities in substrate processing properties are minimized or eliminated, which provides uniform deposition on all portions of the substrate. 
         [0041]    While the foregoing is directed to embodiments of the present disclosure, other and further embodiments of the disclosure may be devised without departing from the basic scope thereof, and the scope thereof is determined by the claims that follow.