Patent Publication Number: US-2023162947-A1

Title: High density plasma enhanced process chamber

Description:
BACKGROUND 
     Field 
     Embodiments of the present disclosure generally relate to process chambers, such as high density plasma (HDP) chambers. More particularly, embodiments of the present disclosure relate to incorporating faraday shields to reduce capacitive coupling. 
     Description of the Related Art 
     In the manufacture of solar panels or flat panel displays, many processes are employed to deposit thin films on substrates, such as semiconductor substrates, solar panel substrates, and liquid crystal display (LCD) and/or organic light emitting diode (OLED) substrates, to form electronic devices thereon. The deposition is generally accomplished by introducing a precursor gas into a chamber having a substrate disposed on a temperature controlled substrate support. The precursor gas is typically directed through a gas distribution assembly disposed above the substrate support. The precursor gas in the chamber is energized (e.g., excited) into a plasma by applying a single or array of radio frequency (RF) antennas inductively coupled to the precursor gas to form the plasma. The excited gas reacts to form a layer of material on a surface of the substrate that is positioned on the temperature controlled substrate support. 
     The size of the substrates for forming the electronic devices exceeds 1 square meter in surface area. Uniformity in film thickness across these substrates is difficult to achieve. Film thickness uniformity becomes even more difficult as the substrate sizes increase. To provide uniform thicknesses, gases can be provided to the process volume in a plurality of gas distribution zones. Each of the gas distribution zones include plenums that are used to control gas distribution and plasma formation. RF power is used to form plasma that can cause parasitic plasma formation in volumes outside of the substrate process volume. 
     Accordingly, what is needed in the art is a method and apparatus for reducing or shielding an electric field carried by RF antenna and preventing the formation of parasitic plasma. 
     SUMMARY 
     Embodiments of the present disclosure include a method, apparatus, and system distributing plasma. 
     In some embodiments, a showerhead is provided having a perforated tile coupled to a support structure. A dielectric window is disposed over the perforated tile. An electrode is coupled to the dielectric window. An inductive coupler is disposed over the dielectric window. At least a portion of the inductive coupler is angled relative to at least a portion of the electrode. 
     In some embodiments, a plasma deposition chamber is provided having a showerhead having a plurality of perforated tiles coupled to a support structure. A plurality of dielectric windows is disposed over the plurality of perforated tiles, each dielectric window disposed over a corresponding perforated tile. A plurality of electrodes is coupled to the dielectric window to form a faraday shield. A plurality of inductive couplers is disposed over the plurality of dielectric windows. At least a portion of each inductive coupler is angled relative to at least a portion of each electrode. 
     In some embodiments, a method of depositing films on a substrate, includes flowing a precursor gas to a plurality of gas volumes of a showerhead. Each of the gas volumes is defined by a perforated tile, support members, and a faraday shield. The method includes providing radiofrequency power to an inductive coupler disposed above the faraday, the inductive coupler in electrical communication with each of the gas volumes; and distributing plasma to a process volume of a process chamber. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
       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 exemplary embodiments and are therefore not to be considered limiting of its scope, and may admit to other equally effective embodiments. 
         FIG.  1    is a schematic cross-sectional front view of a chamber according to an embodiment. 
         FIG.  2    is a cross-sectional perspective side view of a portion of a lid assembly according to an embodiment. 
         FIG.  3    is a top plan view of an antenna within a lid assembly according to an embodiment. 
         FIG.  4    is a side plan view of an antenna within a lid assembly according to an embodiment. 
         FIG.  5    depicts a top down view of support structure for perforated tiles and dielectric windows according to an embodiment. 
         FIG.  6    depicts a plurality of electrodes coupled to a dielectric window according to an embodiment. 
         FIG.  7 A  is a side cross-sectional view of a dielectric window having electrodes incorporated therein according to an embodiment. 
         FIG.  7 B  is a top plan view of a dielectric window having electrodes incorporated therein disposed below portions of two antennas according to an embodiment. 
         FIG.  8    is a block flow diagram of a method of depositing films over a substrate according to an embodiment. 
     
    
    
     To facilitate understanding, identical reference numerals have been used, where possible, to designate identical elements that are common to the figures. It is contemplated that elements and features of one embodiment may be beneficially incorporated in other embodiments without further recitation. 
     DETAILED DESCRIPTION 
     Embodiments of the present disclosure include a processing system that is operable to deposit a plurality of layers on a large area substrate. A large area substrate as used herein is a substrate having major sides with a large surface area, such as a substrate having a surface area of typically about 1 square meter or greater. However, the substrate is not limited to any particular size or shape. In one aspect, the term “substrate” refers to any polygonal, squared, rectangular, curved or otherwise non-circular workpiece, such as a glass or polymer substrate used in the fabrication of flat panel displays, for example. 
     Herein, a showerhead is configured to flow gas therethrough and into a processing volume of a chamber in a number of independently controlled zones, in order to improve the uniformity of the processing of the surface of a substrate exposed to the gas in the processing zone. Additionally, each zone is configured with a plenum (e.g., gas volume), one or more perforated tiles between the plenum and the processing volume of the chamber. The plenum is formed between a dielectric window, a perforated tile, and a surrounding support structure. Each plenum is configured to allow processing gas(es) to be flowed thereinto and distributed to result in a relatively uniform flow rate, or in some case tailored flow rate, of the gases through the perforated tile and into the processing volume. The plenum in some embodiments has a thickness less than twice the thickness of a dark space of a plasma formed of the process gas(es) at the pressures thereof within the plenum. An inductive coupler, such as an radiofrequency (RF) antenna, is positioned proximate to the dielectric window opposite the plenum, and it inductively couples energy through the dielectric window, plenum, and perforated tile, such as a ceramic perforated tile, to strike and support a plasma in the processing volume. Additionally, in the region between adjacent perforated tiles, an additional process gas flow is provided. The flow of the process gas(es) in each zone and through the region between the perforated tiles is controlled to result in uniform or tailored gas flows to achieve desired process results on the substrate. It has been discovered that parasitic plasma can form within the plenum at high radiofrequency power. The parasitic plasma can deposit film within a surface defining the plenum, such as on a surface of the perforated tile. It has been discovered that providing a faraday shield within the dielectric window reduces an electric field within the plenum below, while enabling a magnetic flux to pass through the dielectric window to be used for substrate processing. 
     Embodiments of the disclosure include a high density plasma chemical vapor deposition (HDP CVD) processing chamber that is operable form one or more layers or films on a substrate. The processing chamber as disclosed herein is adapted to deliver energized species of a precursor gas that are generated in a plasma. The plasma may be generated by inductively coupling energy into a gas under vacuum. It is to be understood that the embodiments discussed herein may be practiced in other chambers capable of providing high density plasma. 
       FIG.  1    is a cross sectional side view showing an illustrative processing chamber  100 , according to one embodiment of the present disclosure. An exemplary substrate  102  is shown on a substrate surface  120  within a chamber body  104 . The processing chamber  100  also includes a lid assembly  106 , a bottom  118  disposed opposite the lid assembly  106 , and a pedestal or substrate support assembly  108  disposed between the lid assembly  106  and the bottom  118 . The lid assembly  106  is disposed at an upper end of the chamber body  104 , and the substrate support assembly  108  is at least partially disposed within the chamber body  104 . The substrate support assembly  108  is coupled to a shaft  110 . The shaft  110  is coupled to a drive  112  that moves the substrate support assembly  108  vertically (in the Z direction) within the chamber body  104 . The substrate support assembly  108  of the processing chamber  100  shown in  FIG.  1    is in a processing position. However, the substrate support assembly  108  may be lowered in the Z direction to a position adjacent to a transfer port  114 . 
     The lid assembly  106  may include a backing plate  122  that rests on the chamber body  104 . The lid assembly  106  also includes a gas distribution assembly or showerhead  124 . The showerhead  124  delivers process gases from a gas source to a processing region  126  between the showerhead  124  and the substrate  102 . The showerhead  124  is also coupled to a cleaning gas source that provides cleaning gases, such as fluorine containing gases, to the processing region  126 . 
     The showerhead  124  also functions as a plasma source  128 . To function as the plasma source  128 , the showerhead  124  includes one or more inductively coupled plasma generating components, or inductive coupler  130 . Each of the one or more inductive couplers  130  may be a single inductive coupler  130 , two inductive couplers  130 , or more than two inductive couplers  130 , are simply described as inductive couplers  130  hereafter. Each of the one or more inductive couplers are coupled across a power source and ground  133 . Although  FIG.  1    depicts each of the inductive couplers  130  connected to the power source and ground  133  in series, a connection in parallel is also contemplated such that each inductive coupler  130  is connected and controlled independently to the power source and ground  133 . In some embodiments, ground  133  is a capacitor. The showerhead  124  also includes a face plate  132  that comprises a plurality of discrete perforated tiles  134 . The power source includes a match circuit or a tuning capability for adjusting electrical characteristics of the inductive couplers. 
     Each of the perforated tiles  134  are supported by a plurality of support members  136 . Each of the one or more inductive couplers or portions of the one or more inductive couplers are positioned on or over a respective dielectric window  138 . An example of an inductive coupler  130  that is disposed over the dielectric windows  138  within the lid assembly  106  is shown in  FIG.  2   . A plurality of gas volumes  140  are defined by surfaces of the dielectric windows  138 , the perforated tiles  134  and the support members  136 . Each of the one or more inductive couplers  130  is configured to create an electromagnetic field that energizes the process gases into a plasma in the processing region  126  below the gas volumes  140  as gas is flowing into the gas volumes  140  and into the chamber volume therebelow through the adjacent perforated tile. In some embodiments, process gases from the gas source are provided to each of the gas volumes  140  via conduits in the support members  136 . The volume or flow rate of gas(es) entering and leaving the showerhead are controlled in different zones of the showerhead  124 . Zone control of processing gases is provided by a plurality of flow controllers, such as mass flow controllers  142 ,  143  and  144  illustrated in  FIG.  1   . For example, the flow rate of gases to peripheral or outer zones of the showerhead  124  is controlled by the flow controllers  142 ,  143 , while the flow rate of gases to a central zone of the showerhead  124  is controlled by the flow controller  144 . When chamber cleaning is required, cleaning gases from a cleaning gas source is flowed to each of the gas volumes  140  and thence into the processing volume  140  within which the cleaning gases are energized into ions, radicals, or both. The energized cleaning gases flow through the perforated tiles  134  and into the processing region  126  in order to clean chamber components. 
       FIG.  2    is an enlarged cross-sectional side view of a portion of the lid assembly  106  of  FIG.  1    from a side view of a transfer port  114 . The perforated tiles  134  include a plurality of openings  218  extending therethrough. Each of the plurality of openings  218  allow gases to flow from the gas volumes  140  into the processing region  126 , at predetermined flow rates due to the diameter of the openings  218 . A mounting portion  225  surrounds the sides of adjacent perforated tiles  134  at an interface of adjacent perforated tiles  134 . The mounting portion  225  includes a ledge or shelf that supports a portion of the perimeter or an edge of the perforated tiles  134 . The mounting portion  225  are fastened to interface members  223  by a fastener, such as a bolt or screw. Each interface member  223  includes a ledge or shelf that supports a portion of the perimeter or an edge of the dielectric window  138 . In some embodiments, each interface member  223  is coupled on each end to adjacent support members  136 . 
     The reduced lateral surface area of the multiple dielectric windows  138  allows the use of dielectric materials as a physical barrier between the vacuum environment and plasma in the gas volume  140  and processing region  126  and the atmospheric environment in which the adjacent inductive coupler  130  is typically positioned, without imposing large stresses therein based on a large area supporting the atmospheric pressure load. 
     Seals are used to seal the volumes (at atmospheric or near atmospheric pressures) from the gas volumes  140  (which are at sub-atmospheric pressures in the millitorr or less range during processing). In some embodiments, during processing, the gas volumes  140  have a vacuum pressure of about 10 mTorr to about 3 Torr. Materials for the showerhead  124 /plasma source  128  are chosen based on one or more of electrical characteristics, strength and chemical stability. The inductive couplers are made of an electrically conductive material. The backing plate  122  and the support members  136  are made of a material that is able to support the weight of the supported components and atmospheric pressure load, which may include a metal or other similar material. The backing plate  122  and the support members  136  can be made of a non-magnetic material (e.g., non-paramagnetic or non-ferromagnetic material), such as an aluminum material. The perforated tiles  134  are made of a ceramic material, such as quartz, alumina or other similar material. The dielectric windows  138  are made of a quartz, alumina or sapphire materials. In some embodiments, the dielectric windows  138  include copper, silver, aluminum, tungsten, molybdenum, titanium, combinations thereof, or alloys thereof. 
     Each inductive coupler  130  includes an antenna  202  disposed proximate to one or more corresponding dielectric windows  138  and a coil  204  coupled to the antenna  202  and to a distribution line coupled to a matching network (e.g., power source). In some embodiments, an upper portion  205  of each antenna  202  is disposed over and at least partially surrounds interfaces of adjacent dielectric windows  138 . Each antenna  202  is disposed over one or more dielectric windows  138  such that base portions  203 ,  302  are positioned on the dielectric windows  138 . The base portion  203 ,  302  is connected in series with upper portion  205 , which is shown in more detail in  FIG.  3   . The base portion  203 ,  302  is made up of first portions  203  oriented at an angle relative to the second portions  302 , such as perpendicular to second portion  302  and disposed along an X-axis. The second portions  302  are shown along a Y-axis of  FIG.  3   . Each of the second portions  302  are parallel with respect to one another and each of the first portions  203  are parallel with respect to one another. Other additional portions are also contemplated to form alternative shapes and angles relative to one another. Angles between portions can be about 60 degrees to about 170 degrees, such as about 80 degrees to about 120 degrees, such as about 90 degrees to about 100 degrees. 
     Each dielectric window  138  includes one or more electrodes  602 . The electrodes  602  are angled relative to second portions  302  by an angle θ. Each electrode  602  is angled θ relative to a length of each second portion  302  of the antenna  202 . In some embodiments, angle θ is about 10 degrees to 170 degrees, such as about 30 degrees to about 150 degrees, such as about 60 degrees to about 120 degrees, such as about 90 degrees. In some embodiments, the electrodes  602  are angled relative to about 50% or more of the base portion  203 ,  302 , such as about 80% to 100% of the base portion  203 ,  302 . 
       FIG.  3    is a top plan view of one embodiment of an antenna  202  positioned on the dielectric windows  138  found in the lid assembly  106 .  FIG.  4    is a side plan view of the antenna  202  positioned on the dielectric windows  138  found in the lid assembly  106 . The antenna  202  configuration shown in  FIG.  3    depicts one antenna  202  that can be arranged with adjacent antennas  202  having substantially the same configuration in a pattern across the showerhead  124 . The antenna  202  includes a conductor pattern that is a rectangular spiral shape. Other spiral shapes are contemplated based on a shape the substrate. Electrical connections include an electrical input terminal  295 A and an electrical output terminal  295 B. Each of the one or more inductive couplers  130  of the showerhead  124  are connected in series and/or in parallel. In some embodiments, the electrode shape is selected based on the shape of the base of the antenna, such as first and second portions  203  and  302 . In some embodiments, the electrode shape is a rounded L shaped with portions that are angled relative to the portions  302 , such as substantially perpendicular to portions  302  and with electrode portions that are angled relative to the first portions  203 , such as substantially perpendicular to first portions  203 . 
       FIG.  5    depicts a top down view of an example support structure  500  for the perforated tiles  134  and dielectric window  138 . The support structure  500  includes the plurality of support members  136  and interface members  223 . The support structure  500  includes a plurality of openings  512 A,  512 B through which the perforated tiles  134  and dielectric windows  138  are disposed. End openings  512 A are disposed on each end of the support structure  500  and center openings  512 B are disposed between two end openings  512 A. Although only a single center opening  512 B is depicted between two end openings, a plurality of center openings  512 B are also contemplated depending on the size of the substrate to be processed. Each of the end openings  512 A are shorter in length relative center openings  5126  disposed between. Each of the end openings  512 A are equal in width relative to the center openings  512 B. Although only two rows of end openings  512 A, and center openings  512 B are shown, other number of rows are contemplated depending on the dimensions and size of the substrate to be processed. In some embodiments, there are about 6 openings (each of  512 A,  512 B) to about 30 openings, such as about 8 openings to about 20 openings. In some embodiments, each end opening  512 A corresponds to a half an antenna and each center opening  512 B corresponds to a full antenna, such as two halves of two antennas disposed thereon. 
       FIG.  6    depicts a plurality of faraday shields  600  coupled to the dielectric window  138 . In some embodiments, the faraday shields  600  are grounded. Each faraday shield  600  includes a plurality of electrodes  602 , such as about two electrodes per faraday shield  600  to about 20 electrodes, such as about 4 electrodes to about 12 electrodes, such as about 5 electrodes to about 11 electrodes. Each electrode  602  has an electrode width  606  is spaced apart from adjacent electrodes by an electrode spacing  604 . In some embodiments, the spacing  604  is uniform or substantially the same between adjacent electrodes. Alternatively, the spacing  604  is different, such as reduced or increased spacing at the edges of the faraday shield relative to a center of the faraday shield. As used herein, the electrode spacing  604  is defined as a shortest distance between outermost surfaces of adjacent electrodes facing one another. Each electrode  602  is substantially parallel to one another. The electrode width  606  is about 5 mm to about 60 mm, such about 10 mm to about 50 mm. The spacing  604  is about 20 mm to about 60 mm, such as about 21 mm to about 54 mm. The spacing  604  and electrode width  606  is determined to enable a reduction in electric field under the faraday shields  600  while maintaining the magnetic field and ICP coupling. Spacing  604  that is wide and electrode width  606  that is narrow has a reduced faraday effect, however, spacing  604  that is narrow and electrode width  606  wide adversely inhibits magnetic field formation. Electrode spacing is determined based on gases used during a process, pressure, temperature, and other factors that affect RF electric field threshold. 
     The plurality of electrodes  602  are disposed on a first plane and the second portions  302  of the antenna  202  are disposed on a second plane disposed above the first plane. The first and second planes are parallel with respect to one another. Each electrode  602  is angled θ relative to a length of each second portion  302  of the antenna  202 . In some embodiments, angle θ is about 10 degrees to 170 degrees, such as about degrees to about 150 degrees, such as about 60 degrees to about 120 degrees, such as about 90 degrees. The electrodes  602  are formed from any metal or conductive material. The material of the electrodes  602  is selected based on effectiveness for shielding and based on mechanical considerations. Electrode material is selected based on material density, modulus, thermal expansion coefficient, and other properties. Electrode material can include one or more of copper, steel, aluminum, silver, and iron. In some embodiments, the faraday shields  600  include copper, silver, aluminum, tungsten, molybdenum, titanium (such as titanium nitride), combinations thereof, or alloys thereof. In some embodiments, the faraday shields  600  include nickel alloys and stainless steel materials having permeability of greater than 1. In some embodiments, the faraday shields  600  include a dielectric supporting material including one or more of quartz, aluminum oxide, aluminum nitride or other ceramic materials. 
     Materials of the faraday shields  600  are selected based on a range of RF power used during processing within the chamber. Although parallel electrodes are depicted in the figures, other configurations and patterns are contemplated such as multiple electrodes arranged in repeating patterns, non-parallel electrodes, radially arranged electrodes (e.g., rectangular radially arranged electrodes, non-radially arranged electrodes, and other arrangements. In some embodiments, the arrangements of the electrodes are based on an arrangement of the antenna  202 . In some embodiments, the faraday shields  600  are grounded via additional electrodes leading to the electrodes  602 . The faraday shields  600  can be grounded by a single point of contact, sparse multiple contacts, dense multiple contacts, continuous contact with surrounding chamber ground, such as RF gaskets or other forms of contacts. Contact impedance is zero or substantially zero at significantly low levels at process frequencies. 
     Without being bound by theory, it is believed that the faraday shields  60  provide a substantial increase to a threshold of radiofrequency (RF) electric field level that strike plasma in volumes other than the process volume to form which is parasitic to main plasma intended for substrate processing, such as within process volume  140 . The light-up threshold can be described by a Paschen discharge curve associated with pressure, gas composition, and flow rate conditions for certain gas delivery designs. As RF power is increased, parasitic plasma is formed above the designed threshold. Increasing the threshold enables increasing RF power while limiting parasitic plasma, such as limiting plasma in volumes within gas passageways, such as gas volume  140 . Parasitic plasma in the volume  140  can result in film deposition on a top surface of the perforated tile  134  which can produce particulates that can contaminate substrates. It has been discovered that incorporating faraday shields  600  between antenna  202  and the gas volume  140  substantially increases the threshold level for plasma excitation below the faraday shield  600  such that higher RF power is possible. 
     In some embodiments, the RF power supplied to the inductive coupler  130  is about 1 kW to about 500 kW, such as about 5 kW to about 50 kW, such as about 10 kW to about 30 kW, such as about 15 kW to about 20 kW. In some embodiments, the RF power is supplied at a frequency of about 100 kHz to about 500 MHz frequency depending on the predetermined process and operating parameters. In some embodiments, the RF power is supplied to sustain a plasma having a plasma density of about 1×10 10  cm 3  to about 10×10 12  cm 3 . It has been discovered that the faraday shield described herein enables raising an RF power by about 1 kW to about 10 kW, such as about 5 kW to about 8 kW to process substrates substantially free of defects related to parasitic plasma. An ability to raise the RF power enables an ability to raise throughput and produce more substrates. 
       FIG.  7 A  is a side cross-sectional view of a dielectric window  138  having a faraday shield  600  incorporated therein. The faraday shield  600  can be disposed between an upper surface  701  and a bottom surface  705  of the dielectric window  138 . It has been discovered that a positioning of the faraday shield  600  at or proximate to the upper surface  701  can induce arcing, such as in areas proximate to Teflon gas line covers. Arcing is formed in the small air gap due to the high voltage differential between the antenna (high voltage) and the grounded faraday shields over a short distance. Embedding the faraday electrodes within the dielectric window  138  (e.g., quartz material) eliminates the air gap around electrodes and reduces, such as substantially eliminates arcing. It has been further discovered that positioning the electrodes at or proximate to the bottom surface  705  of the dielectric window provides less effective shielding. The electrode  602  is embedded at a distance  702  from the upper surface  701  of the dielectric window  138 , the distance  702  is about 10 mm to about 20 mm, such as about 12 mm to about 16 mm. In some embodiments, the electrodes  602  are disposed at the upper surface  701  of the dielectric window  138 , or at the bottom surface  705  of the dielectric window  138 . In some embodiments, the electrodes  602  extend from the top surface  701  to the bottom surface  705  of the dielectric window. The dielectric window  138  has a dielectric window thickness  704  of about 20 mm to about 100 mm. In some embodiments, the faraday shield  600  is embedded at a middle ½ to middle ⅓ of the thickness  704  of the dielectric window. The faraday shield  600  can be printed around and on the dielectric window edges  608  and on the surfaces of the dielectric windows  138 , and/or embedded inside the dielectric windows  138 . The electrodes are coupled to the dielectric supporting material by coating, printing, plating, or using other processes. Manufacturing the faraday shields  600  can also include sintering at high temperatures using an oven, or other processes. In some embodiments, the electrodes of the faraday shield can have a thickness of about 30 μm or thicker. In some embodiments, the faraday shields  600  together with the dielectric window  138  have a transparency ratio of about 1% to about 99%, such as 10% to about 30%, or about 60% to about 80%. As used herein, “transparency ratio” refers to an electrode surface area over a total surface area of the faraday shield  600  (e.g., electrodes  602 ) together with the dielectric window  138 . A transparency ratio of 100% refers to no electric field going through due to perfect shielding and 0% refers to all of the electric field going through without any shielding. 
     The showerhead  124  having the inductive coupler  130  and faraday shields  600  described herein can be used for HDP process chambers. The antennas  202  of the inductive coupler  130  and the faraday shields  600  are capable of controlling a degree of ICP or CCP coupling to the plasma at a variety of RF powers. The antennas  202  can be a helix type RF coil of either vertical or flat spiral coils of concentric or rectangular shapes, and of non-flat or vertical shapes. The adjacent coil portions are arranged to locally drive plasma and to interfere or cancel RF magnetic fields generated in order to control constructive or destructive coupling based on coil design. 
       FIG.  7 B  is a top plan view of a dielectric window having electrodes incorporated therein disposed below portions of two antennas according to an embodiment. Although the portions of each antenna that interface the dielectric window form three sides, other number of sides are also contemplated such that the electrodes  602  of the faraday shield form non-zero angles relative to the portions of the antenna disposed thereover. The electrodes  602  of  FIG.  7 B  are oriented to form a non-zero angle relative to portion  302  of the antenna, and a non-zero angle α relative to first portion  203  of the antenna. In contrast,  FIG.  2    depicts the electrodes  602  oriented parallel to first portions  203  of the antenna. The angle and positioning of the electrodes are determined based on power intensity, pressure, temperature, and process gas composition used for a predetermined process. Other electrode arrangements and antenna arrangements are also contemplate. 
       FIG.  8    is a block flow diagram of a method  800  of depositing films over a substrate according to an embodiment. The method includes, in operation  802 , flowing a precursor gas to a plurality of gas volumes of a showerhead. Each of the gas volumes is defined by a perforated tile, support members, and a faraday shield. The faraday shield includes dielectric support material and a plurality of electrodes. In operation  804 , a radiofrequency power is provided to an inductive coupler disposed above the faraday shield. The inductive coupler is in electrical communication with each of the gas volumes. In operation  806 , plasma is distributed to a process volume of a high density plasma process chamber. The plasma has a plasma density of about 1×10 10  cm 3  to about 10×10 12  cm 3  and each gas volume is maintained at a vacuum volume of about 10 mTorr to about 3 Torr. A film is deposited on a substrate, such as a rectangular substrate, the film is composed of silicon oxide, silicon nitride, silicon-oxide-nitride, or combinations thereof. 
     The methods, apparatus, and systems provided herein enable high RF power processes for depositing films with uniform thickness over a substrate. Incorporation of a faraday shield disposed between the inductive coupler and plenum (e.g., gas volume) reduces the presence of parasitic plasma within volumes other than the substrate process volume within the high density plasma chamber.