Patent Publication Number: US-2019187003-A1

Title: Corrosion-Resistant Temperature Sensor Probe

Description:
FIELD 
     The present embodiments relate to a corrosion-resistant temperature sensor probe. 
     Background 
     In some plasma processing systems, a processing gas is supplied to a space within a plasma chamber to process a wafer. The wafer is placed on a support to perform various processes, such as cleaning, depositing, etching, sputtering, etc. During the processing of the wafer, it is important that a temperature within the plasma chamber be maintained. 
     It is in this context that embodiments described in the present disclosure arise. 
     SUMMARY 
     Embodiments of the disclosure provide systems, apparatus, methods and computer programs for fabricating and using a corrosion-resistant temperature sensor probe. It should be appreciated that the present embodiments can be implemented in numerous ways, e.g., a process, an apparatus, a system, a device, or a method on a computer readable medium. Several embodiments are described below. 
     A temperature sensing device usually corrodes when exposed to chemistries used in forming plasma. This corrosion causes premature failure of the temperature sensing device. The premature failure of the temperature sensing device leads to an increased frequency of replacement of the temperature sensing device and to increased down time of a plasma processing chamber. The down time is increased when the plasma processing chamber is opened to replace the temperature sensing device. The plasma processing chamber cannot be used until the plasma processing chamber is closed. Additionally, the temperature sensing device has a filler, such as titanium dioxide used as a pigment. When a portion of the temperature sensing device corrodes, the filler mixes with fluorine within the plasma processing chamber to form a powder, such as titanium fluoride. Remains of the powder within the plasma processing chamber causes contaminant particle issues inside the plasma processing chamber to negatively affect processing of the wafer. 
     In some embodiments, a shaft, such as a plasma resistant or a chemical resistant shaft, is described to allow the use of a temperature sensor probe inside a plasma chamber. The shaft of the temperature sensor probe is made from a material, such as a chemical resistant or a plasma resistant material. Examples of the material for the shaft include perfluoroalkoxy (PFA), polytetrafluoroethylene (PTFE), zirconia, ceramic, mullite, steatite, cordierite, or a combination thereof. The material offers protection against corrosion of the shaft and maintains a low thermal conductivity to provide an accurate temperature reading. 
     By using the material that has a high chemical corrosion resistance, a life of a temperature sensor probe is extended. PTFE and PFA contain fluorine in their chemical structures. Due to the presence of fluorine within the chemical structures, the shaft made from PTFE or PFA or a combination thereof tends to have a higher resistance to fluorine based etching gases. PTFE or PFA of a combination thereof is more susceptible to corrosion from oxygen based etching gases compared to the fluorine based etching gases. However, the oxygen based etching gases are applied in a lower number of processing operations compared to a number of processing operations in which the fluorine based etching gases are applied. For example, a number of active processing hours in which the oxygen based etching gases are applied to a gap within the plasma chamber is less than a number of active processing hours in which fluorine based etching gases are applied to the gap for processing a substrate. As such, a lifetime of the temperature sensor probe is drastically improved. 
     Zirconia is a type of ceramic material, and the chemical bonds of zirconia are extremely high energy. Therefore, the shaft that is made from zirconia exhibits virtually non-existent corrosion from fluorine based etching gases and oxygen based etching gases when a top portion of the shaft is inserted into a ring to be surrounded by the ring. The ring may be an edge ring or a tunable edge ring. The material listed has sufficiently low thermal conductivity to deliver an accurate temperature reading of temperature of the edge ring or the tunable edge ring. If the thermal conductivity of the temperature sensor probe is too high, such as that of most ceramics and metals, the shaft will conduct heat out of the edge ring itself or a thermally conductive layer of the temperature sensor probe where the temperature is measured and will lower the temperature read by the temperature sensor probe. This reduction in sensed temperature leads to a reduction in accuracy of the output of the temperature sensor probe. 
     Some advantages of the herein described systems and methods include providing the temperature sensor probe that lasts greater than a pre-determined time period, such as greater than about 4 months, or about 6 months, or about 1 year, or about 1 year and 2 months, or about 1 year and 4 months, thus reducing a down time of the plasma processing chamber and lowering the frequency with which the temperature sensing device is replaced. For example, the temperature sensor probe is useable for greater than about 1500 active processing hours. As another example, the temperature sensor probe is useable for greater than about 1450 active processing hours. The material also has a low thermal conductivity and so provides an accurate temperature reading. Additionally, the material reduces chances of, such as eliminates or avoids, production of chemical byproducts, such as titanium fluoride powder, inside the plasma chamber. These chemical byproducts act as contaminants to the plasma processing chamber and reduce its efficiency. 
     Further advantages of temperature sensor probe include providing an extended feature between a thermally conductive layer of the temperature sensor probe and the shaft. The extended feature generates a retention force that retains the thermally conductive layer between the shaft and a sleeve of the temperature sensor probe. 
     Other aspects will become apparent from the following detailed description, taken in conjunction with the accompanying drawings. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
       The embodiments may best be understood by reference to the following description taken in conjunction with the accompanying drawings. 
         FIG. 1A  is a diagram of an embodiment of system to illustrate a manner of making and using a corrosion-resistant temperature sensor probe. 
         FIG. 1B  is a diagram of an embodiment of the temperature sensor probe. 
         FIG. 2  is a diagram of an embodiment of a portion of the temperature sensor probe. 
         FIG. 3A  is a diagram of an embodiment of a portion of the temperature sensor probe to illustrate an extended feature. 
         FIG. 3B  is a diagram of an embodiment of a plasma chamber to illustrate a cross-section of the temperature sensor probe. 
         FIG. 3C  is a cross-section of an embodiment of a portion of the temperature sensor probe. 
         FIG. 3D  is a cross-section of an embodiment of a portion of the temperature sensor probe. 
         FIG. 4A  is a diagram of an embodiment of a system to illustrate use of the temperature sensor probe in contact with a tunable edge ring of a plasma chamber. 
         FIG. 4B  is a diagram of an embodiment of a system to illustrate use of the temperature sensor probe in contact with an edge ring of the plasma chamber. 
     
    
    
     DETAILED DESCRIPTION 
     The following embodiments describe systems and methods for fabricating and using a corrision-resistant temperature sensor probe. It will be apparent that the present embodiments may be practiced without some or all of these specific details. In other instances, well known process operations have not been described in detail in order not to unnecessarily obscure the present embodiments. 
       FIG. 1A  is a diagram of an embodiment of a system  100  to illustrate a manner of making and using a corrision-resistant temperature sensor probe  102 . The system  100  includes the temperature sensor probe  102 , a chuck  124 , an edge ring  108 , a tunable edge ring  106 , a cover ring  123 , a coupling ring  136 , a base ring  160 , a filler ring  168 , an insulator ring  152 , a facilities plate  128 , a shim  126 , a converter  130 , and a temperature controller  134 . The chuck  124  is an example of a substrate support. Each of the chuck  124 , the edge ring  108 , the tunable edge ring  106 , the cover ring  123 , the coupling ring  136 , the base ring  160 , the filler ring  168 , the insulator ring  152 , the facilities plate  128 , and the shim  126  is an example of a structure within a plasma chamber. 
     An example of the chuck  124  includes an electrostatic chuck. The edge ring  108  is made of a conductive material, such as silicon, boron doped single crystalline silicon, alumina, silicon carbide, or silicon carbide layer on top of alumina layer, or an alloy of silicon, or a combination thereof. Moreover, the tunable edge ring  106  is made from a dielectric material, such as quartz, or ceramic, or a polymer. Furthermore, each coupling ring  136  and  152  is made from the dielectric material. Also, each of the base ring  160  and the filler ring  168  is fabricated from the dielectric material, such as quartz. The cover ring  123  is made from the dielectric material. Various facility components are coupled to the facilities plate  128 , such as components for heating the chuck  124 , cooling the chuck  124 , control of lift pins for lifting a substrate placed on a top surface of the chuck  124 , and electrostatic clamping of the substrate to the chuck  124 . The shim  126  is made from a non-conductive material, such as an insulator, or a compliant material. 
     Examples of the converter  130  include a light to electrical signal converter. To illustrate, the converter  130  is a photo detector, such as one or more photodiodes. As another illustration, the converter  130  includes a photo detector and an amplifier. The photo detector is coupled to the amplifier. As used herein, a controller includes a processing device, such as, a processor, or an application-specific integrated circuit (ASIC), or a programmable logic device (PLD), or a microprocessor. The controller further includes a memory device, e.g., a random access memory (RAM), a read-only memory (ROM), a volatile memory, a non-volatile memory, etc. Examples of the memory device include a Flash memory, a hard disk, etc. The memory device is coupled to the processing device. The converter  130  is coupled to the temperature sensor probe  102  via a temperature probe cable  132 , such as a fiber optic cable, that is used to carry light. 
     The shim  126  is located below the chuck  124  and the facilities plate  128  is located below the shim  126 . Moreover, the insulator ring  152  is located below the facilities plate  128 . The filler ring  168  is located above the insulator ring  152  and surrounds the facilities plate  128 , the shim  126 , and a portion of the chuck  124 . 
     Moreover, the coupling ring  136  is located above a portion of the chuck  124 , above a portion of the filler ring  168 , and surrounds another portion of the chuck  124 . The base ring  160  surrounds the coupling ring  136  and is located above a portion of the filler ring  168 . The tunable edge ring  106  surrounds a portion of the chuck  124  and is located above a portion of the coupling ring  136 . Also, the edge ring  108  surrounds a portion of the chuck  124 , is located above the tunable edge ring  106 , and is located about a portion of the coupling ring  136 . 
     The base ring  160  surrounds the coupling ring  136  and is located above a portion of the filler ring  168 . The cover ring  123  surrounds a portion of the edge ring  108 , and is located above a portion of the coupling ring  136  and above the base ring  160 . The base ring  160  is coupled to a ground potential. 
     The temperature sensor probe  102  has a thermally conductive layer  104 , a phosphor layer  110 , a sleeve  114 , a spring stop  138 , a shaft  116 , a spring  162 , a fiber bundle housing  140 , a fiber optic medium  112 , a shaft guide  122 , an isolation (iso) ring nut  164 , and a connector  172 . The thermally conductive layer  104  is sometimes referred to herein as a thermally conductive cap. The phosphor layer  110  is an example of a luminescent fluoroptic tip or a luminescence layer. Examples of the thermally conductive layer  104  include a high thermally conductive layer made from a material such as aluminum or copper oraluminum nitride, which are resistive to corrosion from plasma within the plasma chamber and from contaminants generated from plasma processes within the plasma chamber. As an example, the thermally conductive layer  104  has a cross-section that has an inverted U-shape. The sleeve  114  is fabricated from an insulator material, such as plastic. Examples of the plastic include polyether ether ketone, also known as PEEK™. The spring stop  138  is made from a metal or plastic. The  162  is fabricated from a metal, such as aluminum or steel or an alloy of aluminum or an alloy of steel. The spring  162  extends to surround a portion of the shaft  116  in a vertical direction and has its length in the vertical direction. The spring stop  138  is situated to surround another portion of the shaft  116  above the spring  162  and has its length in the vertical direction. The fiber bundle housing  140  is a jacket, which is a protective polymer layer, such as a layer made from plastic or polyurethane or poly vinyl chloride (PVC) or polyethylene or a combination of polyethylene and polyethylene terephthalate (PET). Mylar™ is an example of PET. As an example, the fiber bundle housing  140  is in the form of a tape. The fiber optic medium  112  is a bundle of optical fibers that are attached to, such as bonded to or in contact with, the phosphor layer  110 . A fiber optic medium is sometimes referred to herein as a temperature signal-carrying medium. To illustrate, the fiber optic medium  112  is adhered to a bottom surface of the phosphor layer  110  via a silicone adhesive. As an example, the fiber optic medium  112  has hundreds, such as 300 or 400, optical fibers for transferring light. The isolation ring nut  164  is made from a plastic. The connector  172  is made from a plastic material. The shaft guide  122  is made from the insulator material, such as plastic. To illustrate, the shaft guide  122  is made from polyetherimide (PEI), such as Ultem™. 
     The shaft  116  is made from a material that is resistant to corrosion. For example, the shaft  116  is an anti-corrosive shaft. To further illustrate, the shaft  116  is made from perfluoroalkoxy (PFA), polytetrafluoroethylene (PTFE), zirconia, ceramic, quartz, mullite, steatite, or cordierite. PTFE is sometimes referred to herein as Teflon™ and is a synthetic polymer of tetrafluoroethylene. Teflon™ is a brand name of PTFE-based formulas. PTFE is a fluorocarbon solid, as it is a high-molecular-weight compound including carbon and fluorine. 
     It should be noted that PFA, PTFE, zirconia, mullite, steatite, and cordierite have low thermal conductivity. To illustrate, a thermal conductivity of each of PFA and PTFE is less than 0.5 watt(s) per meter Kelvin (W/m-K). For example, the thermal conductivity of PTFE is about 0.25 W/m-K, such as ranging from and including about 0.2 W/m-K to about 0.3 W/m-K. Moreover, the thermal conductivity of PFA is about 0.25 W/m-K, such as ranging from and including about 0.2 W/m-K to about 0.3 W/m-K. Furthermore, the thermal conductivity of zirconia is about 2.2 W/m-K, such as ranging from and including about 2.1 W/m-K to about 2.3 W/m-K. Also, the thermal conductivity of steatite is about 2.5 W/m-K, such as ranging from and including about 2 W/m-K to about 3 W/m-K. The thermal conductivity of cordierite is about 1.6 W/m-K, such as ranging from and including about 1 W/m-K to about 2 W/m-K. The thermal conductivity of mullite is about 3.5 W/m-K, such as ranging from and including about 3 W/m-K to about 4 W/m-K. The thermal conductivity of a ceramic is about 30 W/m-K, such as ranging from and including about 25 W/m-K to about 35 W/m-K. These values can be compared to a thermal conductivity of alumina, which is about 18 W/m-K or of aluminum, which is about 205 W/m-K. It should be noted that the materials listed above for fabricating the shaft  116  have low thermal conductivity except for ceramic. The low thermal conductivity reduces chances of heat from the thermally conductive layer  104  from being transferred via the shaft  116  to the shaft guide  122  between the fiber bundle housing  140  and the insulator ring  152 . The transfer of heat reduces temperature of the thermally conductive layer  104  resulting in inaccurate measurements of temperature measured by the phosphor layer  110 . The temperature measured by the phosphor layer  110  represents temperature of the edge ring  108 , or the tunable edge ring  106 , or a heater embedded within the tunable edge ring  106 . Because the materials except for ceramic have low thermal conductivity, the temperature that is measured by the measured by the phosphor layer  110  is accurate. It should be noted that zirconia is a type of ceramic. 
     All the materials listed above for fabricating the shaft  116  have a high resistance to corrosion by, e.g., are anti-corrosive to, plasma within the plasma chamber or by contaminant materials, which are chemicals left within the plasma chamber after processing a substrate. For example, the materials listed above for fabricating the shaft  116  have a corrosion resistance, such as an etch resistance, to allow the temperature sensor probe  102  to be used for greater than 1500 active processing hours. To illustrate, the temperature sensor probe  102  is useable in the plasma chamber from and including about 1500 active processing hours to about 3000 active processing hours. As another illustration, the temperature sensor probe  102  is useable in the plasma chamber from and including about 1500 active processing hours to about 4000 active processing hours. As another illustration, the temperature sensor probe  102  is useable in the plasma chamber from and including about 1500 active processing hours to about 5500 active processing hours. As yet another illustration, the temperature sensor probe  102  is useable in the plasma chamber from and including about 1500 active processing hours to about 7500 active processing hours. As another illustration, the temperature sensor probe  102  is useable in the plasma chamber from and including about 3000 active processing hours to about 7500 active processing hours. 
     As another example, the materials listed above for fabricating the shaft  116  have an etch resistance to allow the temperature sensor probe  102  to be used for greater than 2000 active processing hours. To illustrate, the temperature sensor probe  102  is useable in the plasma chamber from and including about 2100 active processing hours to about 3000 active processing hours. As another illustration, the temperature sensor probe  102  is useable in the plasma chamber from and including about 2100 active processing hours to about 4000 active processing hours. As another illustration, the temperature sensor probe  102  is useable in the plasma chamber from and including about 2100 active processing hours to about 5500 active processing hours. As yet another illustration, the temperature sensor probe  102  is useable in the plasma chamber from and including about 2100 active processing hours to about 7500 active processing hours. As another illustration, the temperature sensor probe  102  is useable in the plasma chamber from and including about 2100 active processing hours to about 7500 active processing hours. 
     As another example, the materials listed above to make the shaft  116  have the etch resistance such that the temperature sensor probe  102  is used within the plasma chamber in which the system  100  is located for greater than about 5000 active processing hours. To illustrate, the materials listed above to make the shaft  116  have the etch resistance such that the temperature sensor probe  102  is used within the plasma chamber for a time period from and including about 5000 active processing hours to about 7500 active processing hours. As another illustration, the temperature sensor probe  102  is useable in the plasma chamber from and including about 5000 active processing hours to about 7500 active processing hours. As another illustration, the temperature sensor probe  102  is useable in the plasma chamber from and including about 5000 active processing hours to about 8500 active processing hours. As yet another illustration, the temperature sensor probe  102  is useable in the plasma chamber from and including about 5000 active processing hours to about 10,000 active processing hours. 
     As an example, an RF hour, described herein, is a time period of an hour during which the substrate is processed using plasma within the plasma chamber. The substrate is processed using one or more process gases, such as fluorine, oxygen, fluorine containing gas, or oxygen containing gas, etc. It should be noted that active processing hours that are greater than about 5000 active processing hours allow the temperature sensor probe  102  to be used for greater than a year. Moreover, the active processing hours that are between about 1500 to about 2000 active processing hours allow the temperature sensor probe  102  to be used from about 3 months to about 4 months. 
     The thermally conductive layer  104  is a cylinder that has a tip at one end that is closed and an opening at an opposite end. The thermally conductive layer  104  is in contact with the tunable edge ring  106 . For example, the thermally conductive layer  104  is inserted into a slot formed in a bottom surface of the tunable edge ring  106  and at least a portion of the thermally conductive layer  104  is located within the slot. The thermally conductive layer  104  surrounds the phosphor layer  110  and a portion of the sleeve  114 . The phosphor layer  110  lies within the opening of the thermally conductive layer  104  and is contact with an inside surface of the tip of the thermally conductive layer  104 . The thermally conductive layer  104  is oriented along the vertical direction, which is a direction of a y-axis. The phosphor layer  110  is oriented along a horizontal direction, which is a direction of an x-axis. 
     Moreover, the sleeve  114  is a tube that is located below the phosphor layer  110  and surrounds a portion of the fiber optic medium  112 . The sleeve  114  extends over the fiber optic medium  112  in the vertical direction to surround the portion of the fiber optic medium. The sleeve  114  has the portion that is located inside the opening of the thermally conductive layer  104  and another portion located outside the opening of the thermally conductive layer  104 . The sleeve  114  has the portion that is surrounded by the thermally conductive layer  104  and has another portion that is surrounded by the shaft  116 . The sleeve  114  is oriented along the vertical direction. 
     The shaft  116  is a tube that surrounds a portion of the thermally conductive layer  104 , a portion of the sleeve  114 , a portion  118  of the fiber optic medium  112 , and a portion  120  of the fiber bundle housing  140 . For example, the shaft  116  extends in the vertical direction along the portion of the thermally conductive layer  104 , the portion of the sleeve  114 , the portion  118  of the fiber optic medium  112 , and the portion  120  of the fiber bundle housing  140 . The portion  118  of the fiber optic medium  112  extends in the vertical direction from the sleeve  114  to the fiber bundle housing  140 . The shaft  116  extends in the vertical direction over the portion  118  of the fiber optic medium  112  to protect the fiber optic medium  112  from being corroded by the one or more process gases. For example, a portion of the shaft  116  is adjacent to the portion  118  of the fiber optic medium  112 . The shaft  116  is surrounded partially by the spring stop  138 , partially by the spring  162 , and partially by the shaft guide  122 . The shaft  116  is located below the phosphor layer  110 . The portion  120  extends from a level below the springs  162  until a bottom surface of the shaft  116  or until a space  150  between the fiber bundle housing  140  and the shaft guide  122 . The level above the springs  162  is below the spring stop  138 . 
     The shaft  116  surrounds a portion  125  of the fiber optic medium  112  along the vertical direction. The portion  125  extends in the vertical direction from the bottom surface of the sleeve  114  to the space  150 . The portion  125  of the fiber optic medium  112  is not surrounded by the sleeve  114  in the vertical direction and is located below and adjacent to the sleeve  114 . 
     The spring stop  138  is adjacent to a portion of the shaft  116  and is oriented along the vertical direction. The spring stop  138  is located below the sleeve  114  and above the springs  162 . At a bottom of the spring stop  138  is a protrusion extending in the horizontal direction towards the shaft  116  to fit the spring stop  138  to the shaft  116 . 
     The spring  162  is located adjacent to a bottom surface of the spring stop  138 . For example, the spring  162  has an upper end that abuts against a lower end of the spring stop  138 . The spring  162  has a lower end that abuts an upper surface of the shaft guide  122 . Moreover, the spring  162  is oriented in the vertical direction to have a length in the vertical direction. Compression forces within the spring  162  push up in the vertical direction against the spring stop  138  to move up the shaft  116 , which is fitted to the thermally conductive layer  104 , to further move up the thermally conductive layer  104 . The thermally conductive layer  104  moves up in the vertical direction to contact the heater, such as a resistor, located within the tunable edge ring  106  or the edge ring  108 . 
     The fiber bundle housing  140  has a vertical linear portion extending in the vertical direction, and the vertical linear portion of the fiber bundle housing  140  is contiguous with a curved portion, such as an arced portion having a radius, of the fiber bundle housing  140 . The curved portion of the fiber bundle housing  140  located below the shaft guide  122 . The curved portion of the fiber bundle housing  140  is contiguous with a horizontal linear portion of the fiber bundle housing  140 . For example, the curved portion of the fiber bundle housing  140  is located between the vertical linear portion of the fiber bundle housing  140  and the horizontal linear portion of the fiber bundle housing  140 . The horizontal linear portion of the fiber bundle housing  140  extends along the horizontal direction, which is substantially perpendicular to the vertical direction. For example, the horizontal direction forms an angle ranging from and including 85° to 95° with respect to the vertical direction. As another example, the horizontal direction is perpendicular to the vertical direction. The horizontal linear portion of the fiber bundle housing  140  extends via the isolation ring nut  164  and the connector  172  to couple to the temperature probe cable  132 . The vertical linear portion of the fiber bundle housing  140 , the curved portion of the fiber bundle housing  140 , and the horizontal linear portion of the fiber bundle housing  140  surrounds a portion of the fiber optic medium  112  that extends from a level above the shaft guide  122  to a level  121 . The level above the shaft guide  122  is below the spring stop  138 . Moreover the level  121  is along the horizontal direction to the right of the isolation ring nut  164  and to the left of the curved portion of the fiber optic medium  112 . 
     The space  150  extends along the vertical direction and is formed between a portion of the fiber bundle housing  140  and a portion of the shaft guide  122 . The space  150  extends along the portion of the fiber bundle housing  140  and surrounds the portion of the fiber bundle housing  140 . The shaft guide  122  surrounds a portion of the shaft  116  and the space  150 . The space  150  is formed between a bottom surface of the shaft  116  and a bottom surface of the shaft guide  122 . The space  150  is adjacent to the shaft  116 . The space  150  has a vacuum that extends from the bottom surface of the shaft  116  to the bottom surface the shaft guide  122 . In addition, the shaft  116  is located within a vacuum and the vacuum extends until the isolation ring nut  164 . 
     The fiber optic medium  112  extends from the phosphor layer  110  to the isolation ring nut  164 . The fiber optic medium  112  has a vertical linear portion extending in the vertical direction from the phosphor layer  110  to the bottom surface of the shaft guide  122 , and the vertical linear portion of the fiber optic medium  112  is contiguous with a curved portion of the fiber optic medium  112 . The curved portion of the fiber optic medium  112  is located below the shaft guide  122  and the space  150 . The curved portion of the fiber optic medium  112  is contiguous with a horizontal linear portion of the fiber optic medium  112 . For example, the curved portion of the fiber optic medium  112  is located between the vertical linear portion of the fiber optic medium  112  and the horizontal linear portion of the fiber optic medium  112 . The horizontal linear portion of the fiber optic medium  112  extends along the horizontal direction from the curved portion of the fiber optic medium  112  to the isolation ring nut  164 . 
     The isolation ring nut  164  extends along the horizontal direction to surround a portion of another fiber optic medium  127 , which is coupled with the fiber optic medium  112 . Examples of the fiber optic medium  127  are the same as that of the fiber optic medium  112 . Moreover, the connector  172  also extends along the horizontal direction to surround another portion of the fiber optic medium  127 . The fiber optic medium  127  is coupled with the temperature probe cable  132 . 
     The temperature sensor probe  102  extends in the horizontal direction within the insulator ring  152 . The temperature sensor probe  102  further curves within the insulator ring  152  and extends in the vertical direction via the filler ring  168 , the coupling ring  136 , and via a portion of the tunable edge ring  106 . For example, a through hole in the horizontal direction is fabricated, such as drilled, within the insulator ring  152  to fit a horizontal portion, extending along the horizontal direction, of the temperature sensor probe  102  within the through hole. Moreover, a cable guide is fitted within the through hole within the insulator ring  152  to facilitate a curved portion of the temperature sensor probe  102  to curve within the cable guide. The cable guide extends from the horizontal direction to the vertical direction. Furthermore, the through hole within the insulator ring  152  is formed along the vertical direction to fit a vertical portion of the temperature sensor probe  102 . The through hole within the insulator ring  152  extends in the horizontal direction and in the vertical direction. The extension of the through hole of the insulator ring  152  in the horizontal direction is adjacent to the extension of the through hole of the insulator ring  152  in the vertical direction. The cable guide is fitted within a portion of the extension of the through hole of the insulator ring  152  in the vertical direction and within a portion of the extension of the through hole of the insulator ring  152  in the horizontal direction. 
     In addition, a through hole is formed, such as drilled within the filler ring  168  to vertically extend the temperature sensor probe  102  via the through hole. Furthermore, a through hole is fabricated, such as drilled, within the coupling ring  136  to further vertically extend the temperature sensor by the through hole. In addition, a slot is fabricated, such as drilled, within the bottom surface of the tunable edge ring  106  or edge ring  108  to insert the thermally conductive layer  104  within the slot. 
     As temperature of the edge ring  108  or the tunable edge ring  106  or the heater changes, such as increases or decreases, a temperature of the thermally conductive layer  104  changes, such as increases or decreases. With the change in the temperature of the thermally conductive layer  104  and when light from a light source is incident on the phosphor layer  110 , a temperature of the phosphor layer  110  changes and the phosphor layer  110  emits light. The light source emits light towards the phosphor layer  110  via the fiber optic medium  112 . The light emitted by the phosphor layer  110  as a result of the light incident on the phosphor layer  110  travels via the fiber optic medium  112  in the vertical direction, such as a downward direction, further along the curved portion of the fiber optic medium  112  and further along the horizontal linear portion of the fiber optic medium  112 . The light further travels from the horizontal portion of the fiber optic medium  112  via the fiber optic medium  127 , a portion of which is in the isolation ring nut  164 , to be received by the temperature probe cable  132 . The temperature probe cable  132  further transfers the light to the converter  130 , which converts the light into an electrical signal. The processor of the temperature controller  134  receives the electrical signal and from a rate of change in intensity of the electrical signal, determines a temperature of the heater or the edge ring  108  or the tunable edge ring  106  or the heater. For example, the processor determines the temperature based on an amount of time it takes for the intensity of the electrical signal to reach a pre-determined level. The intensity of the electrical signal diminishes from a level that is measured by the phosphor layer  110  to the pre-determined level. 
     The processor of the temperature controller  134  sends a control signal to a power supply, such as a direct current (DC) power supply, that is coupled to the heater. Upon receiving the control signal, the power supply modifies such as increases or decreases, an amount of power being supplied to the heater by the power supply to change a temperature within the plasma chamber. 
     In some embodiments, the temperature sensor probe  102  excludes the connector  172  and the isolation ring nut  164 . 
     In various embodiments, the fiber optic medium  112  is a fiber optic tube. The fiber optic tube cannot be curved and is straight. 
     In various embodiments, the shaft  116  is not made from a thermally conductive material, such as aluminum or steel or another metal, which is highly conductive to heat transferred from the thermally conductive layer  104 . As a thermal conductance to the thermal conductivity material of the shaft  116  increases, accuracy of temperature that is measured by the phosphor layer  110  decreases. 
     In several embodiments, the curved portion, as used herein, of the temperature sensor probe  102  is an arced portion that has a radius. 
     In some embodiments, the thermally conductive layer  104  is in contact with a heater embedded within the tunable edge ring  106 . 
     In various embodiments, the phosphor layer  110  is sometimes referred to herein as a luminescent layer or a temperature sensing layer. 
     In some embodiments, instead of the luminescent fluoroptic tip, a thermocouple, a thermister, or an Inter-integrated circuit (I 2 C) chip is used to measure a temperature within the plasma chamber. The luminescent fluoroptic tip, the thermocouple, the thermister, and the I 2 C chip are all examples of a temperature sensing medium. It should be noted that when the thermocouple, thermister, or the I 2 C chip is used, instead of light emitted from the phosphor layer  110 , an electrical signal is generated based on a temperature within the plasma chamber. The electrical signal is transferred via a metal conductor, such as an electrically conductive wire, to the temperature controller  134 . The conductor and a fiber optic medium are examples of a temperature signal-carrying medium. The electrical signal and the light emitted from the luminescent fluoroptic tip are examples of a temperature signal. 
       FIG. 1B  is a diagram of an embodiment of the temperature sensor probe  102 . The shaft guide  122  extends in the vertical direction to fit over the shaft  116 . Once the shaft guide  122  is extended over the shaft  116 , the spring  162  is extended in the vertical direction to abut the shaft guide  122 . Once the spring  162  abuts the shaft guide  122 , the spring stop  138  is extended in the vertical direction to abut the spring  162 . 
       FIG. 2  is a diagram of an embodiment of a portion of the temperature sensor probe  102 . This sleeve  114  extends in the vertical direction over a portion  205  of the fiber optic medium  112  to surround the portion  205 . The portion  205  of the fiber optic medium  112  is a part of a distal end of the fiber optic medium  112 . The distal end of the fiber optic medium  112  is further described below. The portion  205  is between the bottom surface of the phosphor layer  110  and a level  203 . The level  203  is above the spring stop  138 . The level  203  is between the spring stop  138  and the thermally conductive layer  104 . 
     The shaft  116  extends in the vertical direction parallel to a portion  202  of the thermally conductive layer  104  to surround the portion  202  of the thermally conductive layer  104 . For example, a portion of an inner surface of the shaft  116  is adjacent to the portion  202  of an outer surface of the thermally conductive layer  104 . The portion  202  extends from a level  202 A below the phosphor layer  110  until a level  202 B below the phosphor layer  110 . The level  202 A is above the level  202 B. 
     Moreover, the shaft  116  further extends in the vertical direction over a portion  204  of the sleeve  114  to surround the portion  204  of the sleeve  114 . For example, a portion of the inner surface of the shaft  116  is adjacent to the portion  204  of an outer surface of the sleeve  114 . The portion  204  extends from a bottom surface of the thermally conductive layer  104  to the level  203 . Because the shaft  116  extends in the vertical direction to surround the portion  202  of the thermally conductive layer  104  and the portion  204  of the sleeve  114 , the shaft  116  reduces chances, such as protects, the portions  202  and  204  from being corroded by the one or more process gases. 
     The sleeve  114  protects the fiber optic medium  112  from being damaged during manufacturing of the temperature sensor probe  102 . The sleeve  114  is made from plastic instead of glass. If sleeve  114  is made from glass, then the glass sleeve may fracture when the temperature sensor probe  102  is bent. The temperature sensor probe  102  is more susceptible to bending when the shaft  122  is made from a less rigid material such as PFA or PTFE instead of a harder or a more rigid material such as Torlon™. 
     In some embodiments, in which the shaft  116  is made from the rigid material, the sleeve  114  is made from glass and the glass sleeve  114  is bonded to the ceramic. For example, a silicone adhesive is used to attach, such as bond, the glass sleeve  114  with the ceramic shaft  116 . The rigid material is not flexible in that the rigid material is stiff compared to the flexible material. For example, a force used to bend the rigid material is substantially greater than a force used to bend the flexible material. 
     In various embodiments, a non-resistive material, such as polyamide-imide or acrylonitrile butadiene styrene (ABS), is not used for fabricating the shaft  116 . The non-resistive material offers lower or no resistance to corrosion compared to the materials described above for fabricating the shaft  116 . Teflon™ is an example of polyamide-imide. Polyamide-imide is rigid and is not flexible. Moreover, polyamide-imide has an etch resistance that is less than that of the materials listed above for fabricating the shaft  116 . For example, when polyamide-imide is used to protect a temperature probe, a number of active processing hours for which the temperature probe is used within the plasma chamber is less than about 1000 hours. As another example, when polyamide-imide is used to protect a temperature probe, a number of active processing hours for which the temperature probe is used within the plasma chamber is less than about 1200 hours. As yet another example, when polyamide-imide is used to protect a temperature probe, a number of active processing hours for which the temperature probe is used within the plasma chamber is less than about 2000 hours. As yet another example, when polyamide-imide is used to protect a temperature probe, a number of active processing hours for which the temperature probe is used within the plasma chamber ranges from and including about 1500 active processing hours to about 2000 active processing hours. Fifteen hundred active processing hours corresponds to a time period of about 3 months and 2000 active processing hours corresponds to a time period of about 4 months. For example, when the temperature sensor probe  102  or the temperature probe is used for about 3 months, the temperature sensor probe  102  or the temperature probe is within the plasma chamber for about 1500 active processing hours. As another example, when the temperature sensor probe  102  or the temperature probe is used for about 4 months, the temperature sensor probe  102  or the temperature probe is within the plasma chamber for about 2000 active processing hours. 
     Moreover, it should be noted that an annular width of the shaft  116  is reduced by about a 100 th  compared to a reduction in an annular width of the polyamide-imide when used as a protective medium of the temperature probe. For example, the annular width of polyamide-imide when used as the protective medium for the temperature probe decreases by about 0.02 inch after one mean time between clean (MTBC) of the plasma chamber. The shaft  116  has the annular width that is reduced by about 0.0002 inch after one MTBC. The annular width of the shaft  116  is a difference between an inner diameter of the inner surface of the shaft  116  and an outer diameter of an outer surface of the shaft  116 . It should be noted that the inner diameter and the outer diameter of the shaft  116  are variable along a length of the shaft  116 . The length of the shaft  116  is along the y-axis and the inner and outer diameters are along the x-axis. 
       FIG. 3A  is a diagram of an embodiment of a portion of the temperature sensor probe  102 . The thermally conductive layer  104  has a tip  310 . A bottom surface  312  of the tip  310  is in contact with an upper surface of the phosphor layer  110 . Moreover, a bottom surface  314  of the phosphor layer  110  abuts to, such as in contact with, the fiber optic medium  112 . 
     The outer surface of the thermally conductive layer  104  has an extended feature  302 . For example, the extended feature  302  is integrated within the outer surface of the thermally conductive layer  104 . As another example, the extended feature is integrated within the thermally conductive layer  104  to circle around a body of the thermally conductive layer  104 . The outer surface of the thermally conductive layer  104  faces the inner surface of the shaft  116 . For example, a portion of the outer surface of the thermally conductive layer  104  is adjacent to a portion of the inner surface of the shaft  116 . The extended feature  302  is sometimes referred to herein as a tooth feature. The extended feature  302  extends in the horizontal direction with respect to a vertical plane along a length of the thermally conductive layer  104 . The length of the thermally conductive layer  104  is along the y-axis. Each vertical plane, described herein, is parallel to the y-axis. The extended feature  302  is made from the same material from which the thermally conductive layer  104  is made. It should be noted that the extended feature  302  is not retractable in the horizontal direction. 
     The extended feature  302  has a portion  302 A and another portion  302 B. The portion  302 A forms an angle of about 30 degrees with respect to the vertical plane  306  along the length of the outer surface of the thermally conductive layer  104 . For example, the portion  302 A forms an angle ranging from and including about 20° to about 32° with respect to the vertical plane  306 . Moreover, the portion  302 B forms an angle of about 7.5° with respect to the vertical plane  306 . For example, the portion  302 B forms an angle from including about 7° to about 8° with respect to the vertical plane  306 . The vertical plane  306  extends in the vertical direction and is parallel to the vertical direction. Furthermore, a thickness of the extended feature  302  along the horizontal direction is about 0.001 inch. For example, the thickness of the extended feature  302  ranges from including about 0.0005 inch to about 0.0015 inch. The thickness of the extended feature  302  is measured in the horizontal direction from the vertical plane  306 . 
     The thermally conductive layer  104  is inserted between the sleeve  114  and the shaft  116  in the vertical direction until the extended feature  302  fits against the shaft  116  to press fit the high thermally conductive layer  104  to the shaft  116 . The press fit reduces chances of, such as prevents the one or more process gases within the plasma chamber from entering between the outer surface of the thermally conductive layer  104  and the inner surface of the shaft  116  to protect the shaft  116  and the fiber optic medium  112  from corrosion. Moreover, the press fit reduces chances of the thermally conductive layer  104  from falling off from between the shaft  116  and the sleeve  114  during handling or maintenance or manufacturing of the temperature sensor probe  102  or removal of the temperature sensor probe  102  from the plasma chamber. For example, the extended feature  302  makes it more difficult to pull out in the vertical direction the thermally conductive layer  104  from between the shaft  116  and the sleeve  114  compared to pushing the thermally conductive layer  104  in the vertical direction to fit between the shaft  116  and the sleeve  114 . As such, the extended features  302  provides a retention force to retain a position of the thermally conductive layer  104  with respect to a position of the shaft  116 . It should be noted that when ceramic is used as a material for the shaft  116 , instead of press fitting the thermally conductive layer  104  to the shaft  116 , a bond is formed via an adhesive, such as a silicone adhesive, between the shaft  116  and the thermally conductive layer  104 . 
     Moreover, the thermally conductive layer  104  is attached, such as bonded via silicone adhesive, with an outer surface of the sleeve  114 . For example, a portion  305  of the inner surface of the thermally conductive layer  104  is bonded with a portion  307  of the outer surface of the sleeve  114 . thermally conductive layer 
     It should be noted that the shaft  116  is fabricated, such as machined, using a lathe machine. Furthermore, the shaft  116  is clearance fitted to the sleeve  114 . For example, and there is no bond, such as adhesive bond, formed between a portion of the inner surface of the shaft  116  and a portion of the outer surface of the sleeve  114 . The portion of the inner surface of the shaft  116  is adjacent to the portion of the outer surface of the sleeve  114  and the adhesive bond is not formed between the two portions. 
     The phosphor layer  110  emits light when excited by light generated by the light source. The light travels via the cable  132 , the fiber optic medium  127 , and the fiber optic medium  112  to the phosphor layer  110 . The rate of decay of the light emitted from the phosphor layer  110  changes with respect to temperature of the phosphor layer  110 . The temperature of the phosphor layer  110  changes when heated due to a temperature within the plasma chamber, such as the temperature of the heater within the tunable edge ring  106  ( FIG. 1A ), or the temperature of the edge ring  108  ( FIG. 1A ). When temperature of the phosphor layer  110  changes, the phosphor layer  110  emits light. The light that is emitted by the phosphor layer  110  travels via the fiber optic medium  112  and the fiber optic medium  127  to the temperature probe cable  132  ( FIG. 1A ) for being converted by the converter  130  ( FIG. 1A ). The converter  130  converts the light into the electrical signal. The processor of the temperature controller  134  ( FIG. 1A ) determines a rate of decrease in amplitude of the electrical signal until the pre-determined level is reached to further determine a temperature that is measured by the temperature sensor probe  102 . 
     The shaft  116  excludes fillers, such as, titanium dioxide or titanium, which are present in Torlon™. When Torlon™ corrodes due to the one or more process gases, a mixture of the fillers and the one or more process gases generates a contaminant material, such as titanium fluoride, that contaminates the plasma chamber. The contamination of the plasma chamber negatively affects processing of the substrate within the plasma chamber. With use of the shaft  116  that is not made from Torlon™, chances of corrosion of the shaft  116  are diminished. The shaft  116  excludes the fillers. So, there is no generation of the contaminating material when the shaft  116  is used within the plasma chamber for processing the substrate. 
     In some embodiments, when the thermally conductive layer  104  is press fitted with the shaft  116 , there is no adhesive bond formed between the thermally conductive layer  104  and the shaft  116 . 
     In several embodiments, an adhesive bond, such as a bond formed using a silicone adhesive, is formed between the adjacent portions of the inner surface of the shaft  116  and of the outer surface of the sleeve  114 . 
     In various embodiments, there is no adhesive bond formed between the outer surface of the thermally conductive layer  104  and the inner surface of the shaft  116 . 
       FIG. 3B  is a diagram of an embodiment of a plasma chamber  406  to illustrate a cross-section of the temperature sensor probe  102 . The phosphor layer  110  has an upper surface US 1  and a lower surface LS 1 . Each of upper surface US 1  and lower surface LS 1  is oriented in the horizontal direction. The upper surface US 1  is adjacent to, such as next to and in contact with, a portion of an inner surface IS 1  of the thermally conductive layer  104 . For example, the upper surface US 1  is in contact with and faces the inner surface IS 1  of the thermally conductive layer  104 . The lower surface LS 1  is not in contact with the inner surface IS 1  of the thermally conductive layer  104 . As an example, the inner surface IS 1  is along the inverted U-shape of the thermally conductive layer  104 . The phosphor layer  110  has a distance d 1 , which is along a center axis  350 . The center axis  350  is further described below. 
     The thermally conductive layer  104  has an outer surface OS 1 . As an example, the outer surface OS 1  is along the inverted U-shape of the thermally conductive layer  104 . The inner surface IS 1  is closer to the phosphor layer  110  compared to the outer surface OS 1  Moreover, the outer surface OS 1  is not adjacent to the phosphor layer  110 . 
     The fiber optic medium  112  has the center axis  350  that passes via a centroid of the vertical linear portion of the fiber optic medium  112 . As an example, the center axis  350  is parallel to the y-axis. The vertical linear portion of the fiber optic medium  112  is parallel to the center axis  350 . 
     The shaft  116  has a shaft body  362  further having a shaft insertion end  360 . The shaft insertion end  360  extends along the center axis  350  from the bottom surface of the thermally conductive layer  104  to a level located, in the vertical direction, between the extended feature  302  and a top surface of the sleeve  114 . 
     The fiber optic medium  112  has a distal end  352  that is closer to the phosphor layer  110  compared to a proximal end  354  of the fiber optic medium  112 . Moreover, the distal end  352  is adjacent to, such as next to and in contact with, the lower surface LS 1  of the phosphor layer  110 . The proximal end  354  is the horizontal linear portion of the fiber optic medium  112  and the distal end  352  is a vertical linear portion of the fiber optic medium  112 . The proximal end  354  facilitates a transfer of light that is emitted by the phosphor layer  110  and received via the vertical linear portion and the curved portion of the fiber optic medium  112  to the cable  132  ( FIG. 1A ). The curved portion of the fiber optic medium  112  is between the proximal end  354  and the distal end  352 . 
     The fiber optic medium  112  has a diameter D 3 , which is substantially uniform along the vertical linear portion, the curved portion, and the horizontal linear portion of the fiber optic medium  112 . Moreover, an outer diameter of the sleeve  114  is D 1 . For example, a diameter of the outer surface of the sleeve  114  is D 1 . A portion of the outer surface of the sleeve  114  is adjacent to a portion of the inner surface IS 1  of the thermally conductive layer  104  and a portion of the outer surface of the sleeve  114  is adjacent to the inner surface of the shaft  116 . The diameter D 3  is less than the diameter D 1 . 
     Moreover, the outer surface OS 1  of the thermally conductive layer  104  has a diameter D 2 . Each diameter D 1 , D 2 , and D 3  is measured along the horizontal direction. The diameter D 2  is greater than the diameter D 1 . 
     A distance d 2  is defined between the upper surface US 1  of the phosphor layer  110  and the bottom surface of the thermally conductive layer  104 . The distance d 2  is parallel to the center axis  350 . The distance d 1  of the phosphor layer  110  is less than the distance d 2 . For example, a thickness of the phosphor layer  110 , measured along the center axis  350 , is less than the distance d 2 . As another example, the distance d 1  is between about 5% and about 10% of the distance d 2 . 
       FIG. 3C  is a cross-section of an embodiment of a portion of the temperature sensor probe  102 . A portion of an inner surface  370  of the shaft  116  is adjacent to, such as next to and in contact with, the outer surface OS 1  of the thermally conductive layer  104 . The extended feature  302 , which is a protrusion from the outer surface OS 1  of the thermally conductive layer  104  extends into the shaft  116  to form a press fit with the portion of the inner surface  370  of the shaft  116 . It should be noted that in some embodiments, the press fit is formed without the extended feature  302  extending into any slot within the inner surface  370 . For example, there is no slot within the inner surface  370  for the extended feature  302  to extend into. 
     The outer surface OS 1  of the thermally conductive layer  104  has a portion P 1 . Moreover, the inner surface  370  has a portion P 2 . Each portion P 1  and P 2  is oriented in and extends in the vertical direction along the center axis  350 . The tip  310  of the thermally conductive layer  104  is located above the portions P 1  and P 2 . The shaft  116 , when press fitted with the outer surface OS 1  of the thermally conductive layer  104  via the extended feature  302  creates a corrosion seal between the portions P 1  and P 2 . For example, the corrosion seal is created in a peripheral region  380 . The peripheral region  380  is a region that covers an edge E 1 , of the shaft  116 , having an inner diameter, portions of each of the portions P 1  and P 2 , and a portion of the outer surface OS 1 . The peripheral region  380  extends in the horizontal direction along the portion of the outer surface OS 1  and the edge E 1  is adjacent to, such as in contact with, the portion. The peripheral region  380  has a circular cross-section in the vertical direction of the y-axis. The portions P 1  and P 2  are adjacent, such as next to and in contact with the edge E 1  of the shaft  116 . The corrosion seal reduces chances of, such as avoids or prevents, plasma formed within the plasma chamber or of contaminant materials formed within the plasma chamber to enter between the portions P 1  and P 2 . As such, the fiber optic medium  112  is isolated from plasma chemistries, such as the one or more process gases, or the contaminant materials, by the corrosion seal. 
     It should be noted that the tip  310  of the thermally conductive layer  104  is exposed to, such as in contact with, the heater, the edge ring  108 , or the tunable edge ring  106  ( FIG. 1A ) to interface with the heater, the edge ring  108 , or the tunable edge ring  106 . The contact between the tip  310  and the heater, the edge ring  108 , or the tunable edge ring  106  allows temperature of the heater, the edge ring  108 , or the tunable edge ring  106  to be measured by the tip  310 . 
       FIG. 3D  is a cross-section of an embodiment of a portion of the temperature sensor probe  102 . The portion is a zoom-in view Z 1  ( FIG. 3B ) of the temperature sensor probe  102 . When the extended feature  302  press fits to the shaft  116 , a portion of the outer surface OS 1  of the thermally conductive layer  104  is sealed with respect to a portion of the inner surface  370  of the shaft  116  to prevent plasma or remnants of a process performed on the substrate from entering between the outer surface OS 1  and the inner surface IS 2  of the shaft  116 . Moreover, it should be noted that a distal end  376  of the sleeve  114  is surrounded by a portion of the thermally conductive layer  104  and a portion of the shaft  116 . The distal end  376  of the sleeve  114  is closer to the phosphor layer  110  than a proximal end of the sleeve  114 . It should be noted that the proximal end of the sleeve  114  is any remaining portion of a body of the sleeve  114  other than the distal end of the sleeve  114 . 
       FIG. 4A  is a diagram of an embodiment of a system  400  to illustrate use of the temperature sensor probe  102  that extends via the bottom surface of the tunable edge ring  106  with a plasma chamber  406 . The temperature sensor probe  102  extends via the bottom surface of the tunable edge ring  106  to extend within the slot formed in the bottom surface. 
     The plasma chamber  406  includes the edge ring  108  and the tunable edge ring  106 . The system  400  includes a main radio frequency (RF) generator (RFG), a main match the plasma chamber  406 , and a host computer  412 . Examples of the host computer, described herein, include a desktop computer, a laptop computer, a tablet, and a smart phone. The temperature controller  134  ( FIG. 1A ) is an example of the host computer  412 . 
     The host computer  412  includes a processor  414  and a memory  416 , e.g., a random access memory (RAM), a read-only memory (ROM), a volatile memory, a non-volatile memory, etc. The processor  414  is coupled to the memory  416 . As used herein, a processor is an application specific integrated circuit (ASIC), or a programmable logic device (PLD), or a microprocessor, or a microcontroller, or a central processing unit (CPU), and these terms are used interchangeably herein. Examples of a memory device, as used herein, include a Flash memory, a hard disk, etc. 
     The plasma chamber  406  includes an upper electrode  402 , the chuck  124 , the tunable edge ring  106 , the edge ring  108 , and a substrate  409 . The substrate  409  is placed on a top surface of the chuck  124 . Integrated circuits, e.g., an ASIC, a PLD, etc., are developed on the substrate  409  and the integrated circuits are used in a variety of devices, e.g., cell phones, tablets, smart phones, computers, laptops, networking equipment, etc. The upper electrode  402  is made from silicon. The upper electrode  402  faces the chuck  124 . The edge ring  108  surrounds a portion of the chuck  124 . Moreover, the tunable edge ring  106  surrounds a portion of the chuck  124 . 
     The main RF generator is coupled to the main match via an RF cable  418  and the main match is coupled to the chuck  124  within plasma chamber  406  via an RF transmission line  420 . An example of the RF transmission line  420  is an RF cable that is coupled to an RF rod, which is coupled to a lower electrode within the chuck  124 . The processor  414  is coupled to a controller, such as a digital signal processor, within the main RF generator. Moreover, the processor  414  is coupled to the converter  130  via a data transfer cable  426 , such as a serial transfer cable, a parallel transfer cable, or a universal serial bus (USB) cable. Each RF generator, described herein, includes a processor and an RF power supply, such as an RF oscillator. The processor is coupled to the RF power supply of the main RF generator. 
     A match, described herein, is an impedance matching network or an impedance matching circuit that includes electric circuit components, e.g., inductors, capacitors, etc. to match an impedance of a load coupled to an output of the match with an impedance of a source coupled to the input of the match. For example, the main match matches an impedance of the plasma chamber  406  and the RF transmission line  420  coupled to the output of the main match with an impedance of the main RF generator and the RF cable  418 . 
     The processor  414  sends a control signal to the main RF generator The control signal sent to the main RF generator has frequency and power of operation of the main RF generator. Upon receiving the control signal, the main RF generator generates a main RF signal having the frequency and power and sends the main RF signal via the RF cable  418  to the main match. The main match matches an impedance of the load coupled to the output of the main match with that of the source coupled to the input of the main match to modify the main RF signal to generate a modified main RF signal and sends the modified main RF signal via the RF transmission line  420  to the chuck  124 . 
     When one or more process gases are supplied to a gap  408  between the upper electrode  402  and the chuck  124  in addition to supplying the modified main RF signal to the lower electrode of the chuck  124 , plasma is stricken or maintained within the gap  408  to process the substrate  409 . For example, the substrate  409  is processed by using the plasma to deposit material on the substrate, etch the substrate, clean the substrate, or sputter the substrate. Examples of the one or more process gases include an oxygen-containing gas, such as O 2 . Other examples of the one or more process gases include a fluorine-containing gas, such as, tetrafluoromethane (CF 4 ), sulfur hexafluoride (SF 6 ), or hexafluoroethane (C 2 F 6 ). 
     During processing of the substrate  409 , temperature within the plasma chamber  406 , such as the temperature of the tunable edge ring  106 , or the temperature of a heater  410  within the tunable edge ring  106 , or the temperature of the edge ring  108 , is measured by the phosphor layer  110  ( FIG. 1 ) of the temperature sensor probe  102  ( FIG. 1 ). A temperature sensor signal having the measured temperature is sent via the temperature probe cable  132  ( FIG. 14A ) to the processor  414 . The processor  414  determines the measured temperature from the temperature sensor signal and controls the power supply, such as the direct current (DC) power supply, to change an amount of power that is being supplied to the heater  410 , such as a resistor, embedded within the tunable edge ring  106  to change a temperature within the plasma chamber  406 . 
     In some embodiments, the chuck  124  is coupled to the ground potential and the upper electrode  402  is coupled to the main RF generator via the main match. 
       FIG. 4B  is a diagram of an embodiment of a plasma system  450  to illustrate use of the temperature sensor probe  102  that extends within the edge ring  108 . For example, the temperature sensor probe  102  extends via a through hole within the tunable edge ring  106  to further extend within a slot formed in a bottom surface of the edge ring  108 . Moreover, the heater  410  is embedded within the tunable edge ring  106 . The remaining structure and function of the system  450  is the same as that of the system  400  of  FIG. 4A . 
     It should be noted that although the temperature sensor probe  102  is implemented within a dielectric etch chamber as illustrated in  FIG. 4A and 4B , in some embodiments, the temperature sensor probe  102  is implemented within an inductively coupled plasma (ICP) chamber, or an ion implantation chamber, or a plasma deposition chamber, or any other chamber that uses a liquid or a gas, which corrodes a temperature sensing device. 
     It should be noted that although the above embodiments are described with respect to the plasma chamber, it should be noted that in some embodiments, the temperature sensor probe  102  is implemented in a chamber, such as a liquid deposition or gas deposition chamber, that is not a plasma chamber. For example, in the liquid deposition chamber, a liquid may be sprayed onto a substrate to deposit materials on the substrate or to etch portions of the substrate or to clean the substrate. As another example, a gas is supplied to a gas chamber to deposit materials on the substrate or to etch portions of the substrate or to clean the substrate. 
     Embodiments described herein may be practiced with various computer system configurations including hand-held hardware units, microprocessor systems, microprocessor-based or programmable consumer electronics, minicomputers, mainframe computers and the like. The embodiments can also be practiced in distributed computing environments where tasks are performed by remote processing hardware units that are linked through a network. 
     In some embodiments, a controller is part of a system, which may be part of the above-described examples. Such systems include semiconductor processing equipment, including a processing tool or tools, chamber or chambers, a platform or platforms for processing, and/or specific processing components (a wafer pedestal, a gas flow system, etc.). These systems are integrated with electronics for controlling their operation before, during, and after processing of a semiconductor wafer or substrate. The electronics is referred to as the “controller,” which may control various components or subparts of the system or systems. The controller, depending on the processing requirements and/or the type of system, is programmed to control any of the processes disclosed herein, including the delivery of the one or more process gases, temperature settings (e.g., heating and/or cooling), pressure settings, vacuum settings, power settings, RF generator settings, RF matching circuit settings, frequency settings, flow rate settings, fluid delivery settings, positional and operation settings, wafer transfers into and out of a tool and other transfer tools and/or load locks coupled to or interfaced with a system. 
     Broadly speaking, in a variety of embodiments, the controller is defined as electronics having various integrated circuits, logic, memory, and/or software that receive instructions, issue instructions, control operation, enable cleaning operations, enable endpoint measurements, and the like. The integrated circuits include chips in the form of firmware that store program instructions, digital signal processors (DSPs), chips defined as ASICs, PLDs, and/or one or more microprocessors, or microcontrollers that execute program instructions (e.g., software). The program instructions are instructions communicated to the controller in the form of various individual settings (or program files), defining the parameters, the factors, the variables, etc., for carrying out a particular process on or for a semiconductor wafer or to a system. The program instructions are, in some embodiments, a part of a recipe defined by process engineers to accomplish one or more processing steps during the fabrication of one or more layers, materials, metals, oxides, silicon, silicon dioxide, surfaces, circuits, and/or dies of a wafer. 
     The controller, in some embodiments, is a part of or coupled to a computer that is integrated with, coupled to the system, otherwise networked to the system, or a combination thereof. For example, the controller is in a “cloud” or all or a part of a fab host computer system, which allows for remote access of the wafer processing. The computer enables remote access to the system to monitor current progress of fabrication operations, examines a history of past fabrication operations, examines trends or performance metrics from a plurality of fabrication operations, to change parameters of current processing, to set processing steps to follow a current processing, or to start a new process. 
     In some embodiments, a remote computer (e.g. a server) provides process recipes to a system over a network, which includes a local network or the Internet. The remote computer includes a user interface that enables entry or programming of parameters and/or settings, which are then communicated to the system from the remote computer. In some examples, the controller receives instructions in the form of data, which specify the parameters, factors, and/or variables for each of the processing steps to be performed during one or more operations. It should be understood that the parameters, factors, and/or variables are specific to the type of process to be performed and the type of tool that the controller is configured to interface with or control. Thus as described above, the controller is distributed, such as by including one or more discrete controllers that are networked together and working towards a common purpose, such as the processes and controls described herein. An example of a distributed controller for such purposes includes one or more integrated circuits on a chamber in communication with one or more integrated circuits located remotely (such as at the platform level or as part of a remote computer) that combine to control a process on the chamber. 
     Without limitation, in various embodiments, example systems to which the methods are applied include a plasma etch chamber or module, a deposition chamber or module, a spin-rinse chamber or module, a metal plating chamber or module, a clean chamber or module, a bevel edge etch chamber or module, a physical vapor deposition (PVD) chamber or module, a chemical vapor deposition (CVD) chamber or module, a plasma ion implantation chamber, a plasma deposition chamber, an atomic layer deposition (ALD) chamber or module, an atomic layer etch (ALE) chamber or module, an ion implantation chamber or module, a track chamber or module, and any other semiconductor processing systems that is associated or used in the fabrication and/or manufacturing of semiconductor wafers. 
     It is further noted that in some embodiments, the above-described operations apply to several types of plasma chambers, e.g., a plasma chamber including an inductively coupled plasma (ICP) reactor, a transformer coupled plasma chamber, conductor tools, dielectric tools, a plasma chamber including an electron cyclotron resonance (ECR) reactor, etc. For example, one or more RF generators are coupled to an inductor within the ICP reactor. Examples of a shape of the inductor include a solenoid, a dome-shaped coil, a flat-shaped coil, etc. 
     As noted above, depending on the process step or steps to be performed by the tool, the host computer communicates with one or more of other tool circuits or modules, other tool components, cluster tools, other tool interfaces, adjacent tools, neighboring tools, tools located throughout a factory, a main computer, another controller, or tools used in material transport that bring containers of wafers to and from tool locations and/or load ports in a semiconductor manufacturing factory. 
     With the above embodiments in mind, it should be understood that some of the embodiments employ various computer-implemented operations involving data stored in computer systems. These operations are those physically manipulating physical quantities. Any of the operations described herein that form part of the embodiments are useful machine operations. 
     Some of the embodiments also relate to a hardware unit or an apparatus for performing these operations. The apparatus is specially constructed for a special purpose computer. When defined as a special purpose computer, the computer performs other processing, program execution or routines that are not part of the special purpose, while still being capable of operating for the special purpose. 
     In some embodiments, the operations may be processed by a computer selectively activated or configured by one or more computer programs stored in a computer memory, cache, or obtained over the computer network. When data is obtained over the computer network, the data may be processed by other computers on the computer network, e.g., a cloud of computing resources. 
     One or more embodiments can also be fabricated as computer-readable code on a non-transitory computer-readable medium. The non-transitory computer-readable medium is any data storage hardware unit, e.g., a memory device, etc., that stores data, which is thereafter be read by a computer system. Examples of the non-transitory computer- readable medium include hard drives, network attached storage (NAS), ROM, RAM, compact disc-ROMs (CD-ROMs), CD-recordables (CD-Rs), CD-rewritables (CD-RWs), magnetic tapes and other optical and non-optical data storage hardware units. In some embodiments, the non-transitory computer-readable medium includes a computer-readable tangible medium distributed over a network-coupled computer system so that the computer-readable code is stored and executed in a distributed fashion. 
     Although the method operations above were described in a specific order, it should be understood that in various embodiments, other housekeeping operations are performed in between operations, or the method operations are adjusted so that they occur at slightly different times, or are distributed in a system which allows the occurrence of the method operations at various intervals, or are performed in a different order than that described above. 
     It should further be noted that in an embodiment, one or more features from any embodiment described above are combined with one or more features of any other embodiment without departing from a scope described in various embodiments described in the present disclosure. 
     Although the foregoing embodiments have been described in some detail for purposes of clarity of understanding, it will be apparent that certain changes and modifications can be practiced within the scope of appended claims. Accordingly, the present embodiments are to be considered as illustrative and not restrictive, and the embodiments are not to be limited to the details given herein.