Patent Publication Number: US-11664216-B2

Title: ALD process and hardware with improved purge efficiency

Description:
CROSS REFERENCE TO RELATED APPLICATIONS 
     This application is a divisional of U.S. application Ser. No. 16/229,754, filed Jan. 21, 2018, which is hereby incorporated by reference in its entirety. 
    
    
     BACKGROUND 
     Field 
     Embodiments of the present disclosure generally relate to a gas supply system for reducing purge time and increasing processing throughput, and an atomic layer deposition (ALD) chamber having the same. 
     Description of the Related Art 
     ALD is based upon atomic layer epitaxy (ALE) and employs chemisorption techniques to deliver precursor molecules on a surface in sequential cycles. The substrate is disposed in a processing region of an ALD chamber. A first precursor flows into the processing region across the substrate and is exhausted from the processing region. Then, a second precursor flows into the processing region across the substrate and is exhausted from the processing region. The first and second precursors react to form a product compound as a film on the substrate surface. The cycle is repeated to form the layer to a desired thickness. 
     A purge gas may be introduced between introductions of the precursors. As the deposition rate of each cycle is fixed, the purge efficiency factors into cycle time, and thus controls processing throughput. Accordingly, what is needed in the art is a gas supply system for reducing purge time and increasing processing throughput, and an ALD chamber having the same. 
     SUMMARY 
     In one embodiment, a chamber is provided. The chamber includes a chamber body and a lid assembly. The lid assembly includes a chamber inlet having an inert gas opening and a precursor opening, a chamber outlet in fluid communication with a chamber pump, and a process kit. The process kit includes a process kit inlet coupled to the chamber inlet and a process kit outlet coupled to the chamber outlet. A pedestal is disposed in the chamber body. The pedestal includes a processing position that contacts the process kit forming a processing region in fluid communication with the process kit inlet and the process kit outlet. The chamber includes a gas supply system. The gas supply system has an inert gas line and a precursor supply line. The inert gas line includes an inert gas line outlet coupled to the inert gas opening of the chamber inlet, and an inert gas valve disposed between the inert gas line and an inert gas source. The precursor supply line includes a precursor outlet, a first precursor inlet, a second precursor inlet, and a purge outlet. The precursor outlet is coupled to the precursor opening of the chamber inlet. The first precursor inlet is in fluid communication with a first precursor line. The first precursor line is coupled to a first precursor source and includes a first precursor valve. The second precursor inlet is in fluid communication with a second precursor line. The second precursor line is coupled to a second precursor source and includes a second precursor valve. The purge outlet is in fluid communication with a purge line. The purge line is coupled to a gas supply system pump and includes a purge valve. 
     In another embodiment, a chamber is provided. The chamber includes a chamber body and a lid assembly. The lid assembly includes a chamber inlet having an inert gas opening and a precursor opening, a chamber outlet in fluid communication with a chamber pump, and a process kit. The process kit includes a process kit inlet coupled to the chamber inlet and a process kit outlet coupled to the chamber outlet. The process kit inlet includes a flow guide with a diffuser disposed at an outlet of the flow guide. The flow guide has a flow guide inlet in fluid communication with the chamber inlet, a recess disposed between a upper member and a lower member of the flow guide, the recess having a plurality of channels, a plenum disposed between a flow modulator and the flow guide inlet. A pedestal is disposed in the chamber body. The pedestal includes a processing position that contacts the process kit forming a processing region in fluid communication with the process kit inlet and the process kit outlet. The chamber includes a gas supply system. The gas supply system has an inert gas line and a precursor supply line. The inert gas line includes an inert gas line outlet coupled to the inert gas opening of the chamber inlet, and an inert gas valve disposed between the inert gas line and an inert gas source. The precursor supply line includes a precursor outlet, a first precursor inlet, a second precursor inlet, and a purge outlet. The precursor outlet is coupled to the precursor opening of the chamber inlet. The first precursor inlet is in fluid communication with a first precursor line. The first precursor line is coupled to a first precursor source and includes a first precursor valve. The second precursor inlet is in fluid communication with a second precursor line. The second precursor line is coupled to a second precursor source and includes a second precursor valve. The purge outlet is in fluid communication with a purge line. The purge line is coupled to a gas supply system pump and includes a purge valve. 
     In yet another embodiment, a method of forming a film is provided. The method includes purging a processing region of a chamber and a precursor supply line of a gas supply system coupled to an inlet of the processing region of the chamber. The gas supply system includes an inert gas line and a precursor supply line. The inert gas line has an outlet coupled to the inlet, and an inert gas valve disposed between the inert gas line and an inert gas source. The precursor supply line includes a precursor outlet, a first precursor inlet, a second precursor inlet, and a purge outlet. The precursor outlet is coupled to a chamber inlet of the chamber. The first precursor inlet is in fluid communication with a first precursor line. The first precursor line is coupled to a first precursor source and includes a first precursor valve. The second precursor inlet is in fluid communication with a second precursor line. The second precursor line is coupled to a second precursor source and includes a second precursor valve. The purge outlet is in fluid communication with a purge line. The purge line is coupled to a gas supply system pump and includes a purge valve. The purging the processing region and the precursor supply line includes positioning the inert gas valve in an open state to flow an inert gas into the inlet, and positioning the purge valve in the open state and the first precursor valve and the second precursor valve in a closed state to flow a portion of the inert gas in the inlet through the precursor supply line and the purge line, and exhaust the portion of the inert gas with the gas supply system pump. 
    
    
     
       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 view of an atomic layer deposition (ALD) chamber having a gas supply system according to an embodiment. 
         FIG.  2 A  is an isometric view of a flow guide having a first configuration according to an embodiment. 
         FIG.  2 B  is a cross section of a flow guide having a first configuration according to an embodiment. 
         FIG.  3 A  is a schematic top view of a flow guide having a second configuration according to an embodiment. 
         FIG.  3 B  is a schematic side view of a flow guide having a second configuration according to an embodiment. 
         FIG.  4 A  is a schematic cross-sectional view of an ALD chamber having a gas supply system according to an embodiment. 
         FIG.  4 B  is a schematic cross-sectional view of an ALD chamber having a gas supply system according to an embodiment. 
         FIG.  5    is a flow diagram of a method of forming an ALD film 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 described herein provide a gas supply system for reducing purge time and increasing processing throughput, and an atomic layer deposition (ALD) chamber having the same.  FIG.  1    is a schematic cross-sectional view of an ALD chamber  100  having a gas supply system  101 . Suitable ALD chambers may be obtained from Applied Materials, Inc. located in Santa Clara, Calif. It is to be understood that the system described below is an exemplary chamber and other chambers, including chambers from other manufacturers, may be used with or modified to accomplish aspects of the present disclosure. The ALD chamber  100  includes a chamber body  102 , a lid assembly  104 , a process kit  106 , and a substrate support assembly  108 . 
     The lid assembly  104  is disposed at an upper end of the chamber body  102 , and the substrate support assembly  108  is at least partially disposed within the chamber body  102 . The lid assembly  104  includes a chamber inlet  110  of the gas supply system  101  and a chamber outlet  112 . The process kit  106  is coupled to the lid assembly  104 . The substrate support assembly  108  includes a pedestal  116  movably disposed in the chamber body  102  by a stem  118 . The pedestal  116  includes a substrate support surface  132  configured to support a substrate  134 . The stem  118  extends through the chamber body  102  where stem  118  is connected to a lift system (not shown) that moves the pedestal  116  between a processing position (as shown) and a transfer position. The transfer position facilitates transfer of the substrate  134  through a slit valve opening  114  formed in a sidewall of the chamber body  102  to provide access to the interior of the ALD chamber  100 . 
     In the processing position, the substrate support assembly  108  contacts the process kit  106  to form a processing region  120  defined by the substrate support surface  132 , the process kit  106 , and the lower surface of the lid assembly  104 . When the substrate support assembly  108  in the processing position contacts the process kit  106  to form a processing region  120 . The process kit inlet  122  is coupled to the chamber inlet  110  and a process kit outlet  124  is coupled to the chamber outlet  112 . In the processing position, the chamber inlet  110 , the process kit inlet  122 , the processing region  120 , the process kit outlet  124 , and the chamber outlet  112  are positioned to be in fluid communication. In this manner, the gas is provided to the chamber inlet  110  and to the processing region  120  through the process kit inlet  122 . 
     The chamber outlet  112  is in fluid communication with a pump  126 . A pressure controller  140 , such as a Throttle valve (TV) device, is disposed between the chamber outlet  112  and the pump  126 . In one embodiment that may be combined with other embodiments described herein, the pump  126  is coupled to the chamber outlet  112  disposed in the lid assembly  104 . In another embodiment that may be combined with other embodiments described herein, the chamber outlet  112  is disposed in the lid assembly  104  and the chamber body  102 , and the pump  126  is coupled to the chamber outlet  112  disposed in the chamber body  102 . 
     The gas flow in the processing region  120  across the substrate  134  and are exhausted through the process kit outlet  124  and chamber outlet  112  by the pump  126 . The pressure controller  140  is controlling a rate the gas is exhausted from the processing region  120 . An RF (radio frequency) source  128  is coupled an electrode  130  of the lid assembly  104 . The RF source  128  powers the electrode  130  to facilitate generation of plasma from the gas in the processing region  120 . The pedestal  116  is grounded or the pedestal  116  may serve as a cathode when connected to the RF source  128  to generate a capacitive electric field between the lower surface of the lid assembly  104  and the pedestal  116  to generate reactive plasma species for depositing films on the substrate  134 . In embodiments that may be combined with other embodiments described herein, the process kit inlet  122  includes a flow guide  142  with a diffuser  144  disposed at the outlet of the flow guide  142 . The flow guide  142  with the diffuser  144  provides a flow path for substantially uniform distribution of gas across the processing region  120 . However, the diffuser  144  restricts the flow rate of gas across the flow guide  142  resulting in deceased purge efficiency in ALD processes described herein. 
       FIG.  2 A  is an isometric view of the flow guide  142  having a first configuration  200 .  FIG.  2 B  is a cross section of the flow guide  142  having the first configuration  200  along the section line indicated in  FIG.  2 A  with an upper member  148  coupled to the lower member  150 . The flow guide  142  having the first configuration  200  is formed from an upper member  148  and a lower member  150 . The flow guide  142  having the first configuration  200  includes a flow guide inlet  146  in fluid communication with the chamber inlet  110 . A recess  206  is formed in the lower member  150 . When the upper member  148  and the lower member  150  are coupled, a recess  206  is formed. The flow guide  142  having the first configuration  200  has a height  212  of the recess  206 . As a distance  214  from a center line  210  of the flow guide inlet  146  increases, the height  212  of the recess  206  increases. The flow guide  142  having the first configuration  200  provides the flow path for substantially uniform distribution of gas across the processing region  120 . 
       FIG.  3 A  is a schematic top view and  FIG.  3 B  is a schematic side view of the flow guide  142  having a second configuration  300 . The flow guide  142  having the second configuration  300  is formed from the upper member  148  and the lower member  150 . The flow guide  142  having the second configuration  300  includes the flow guide inlet  146  in fluid communication with the chamber inlet  110 . When the upper member  148  and the lower member  150  are coupled, a recess  306  is formed. The recess  306  includes a plurality of channels  304 . A plenum  310  is formed between a flow modulator  308  and the flow guide inlet  146 . Each opening of the flow modulator  308  corresponds to a channel of the plurality of channels  304 . The flow guide  142  having the second configuration  300  provides the flow path for a substantially uniform distribution of gas across the processing region  120 . 
     Referring to  FIG.  1 A , the gas supply system  101  includes a gas line  103  having an outlet  105 , a first precursor inlet  107 , a second precursor inlet  109 , and an inert gas inlet  111 . The outlet  105  is configured to be coupled to the chamber inlet  110  of the lid assembly  104 . The first precursor inlet  107  is in fluid communication with a first precursor line  113 . The first precursor line  113  is coupled to a first precursor source  125  and includes a first valve  119 . The first valve  119  in an open state enabling a first precursor of the first precursor source  125  to the flow through the first precursor line  113  and the gas line  103  into the chamber inlet  110 . The second precursor inlet  109  is in fluid communication with a second precursor line  115 . The second precursor line  115  is coupled to a second precursor source  127  and includes a second valve  121 . The second valve  121  in an open state enabling a second precursor of the second precursor source  127  to the flow through the second precursor line  115  and the gas line  103  into the chamber inlet  110 . The inert gas inlet  111  is in fluid communication with an inert gas line  117 . The inert gas line  117  is coupled to an inert gas source  129  and includes a third valve  123 . The third valve  123  in an open state enabling an inert gas of the inert gas source  129  to the flow through the inert gas line  117  and the gas line  103  into the chamber inlet  110 . In one embodiment, which can be combined with other embodiments described herein, the inert gas of the inert gas source  129  includes at least one of argon (Ar), nitrogen gas (N 2 ), and helium (He). In another embodiment, which can be combined with other embodiments described herein, the inert gas of the inert gas source  129  includes at least one of Ar, N 2 , He, oxygen gas (O 2 ), and nitrous oxide (N 2 O) Additionally, according to embodiments, which can be combined with other embodiments described herein, each of the first precursor source  125 , the second precursor source  127 , and the inert gas source  129  have mass flow controllers (not shown) to provide desired flow rates to the ALD chamber  100  during processing. 
     The first precursor, the second precursor, and the inert gas used for ALD depend upon the process or processes to be performed. The first precursor includes at least one of trimethylaluminium (CH 3 )3Al (TMA) and tetrakis ethyl methyl amino zirconium Zr[N(CH 3 )(C 2 H 5 )] 4  (TEMAZ). The second precursor includes at least one of N 2  and O 2 . However, the first precursor and the second precursor gases are not so limited and may include one or more additional precursors, reductants, catalysts, carrier gases, or any mixture or combination thereof. The gases are introduced into the ALD chamber  100  from one side and flow across the substrate  134 . For example, gases are flowed though chamber inlet  110 , the process kit inlet  122 , and across the processing region  120  and are exhausted through the process kit outlet  124  and chamber outlet  112 . 
     In an exemplary aluminum oxide (Al 2 O 3 ) film forming process, a flow of TMA, i.e, the first precursor, is delivered to the processing region  120 . The first valve  119  in an open state enabling the first precursor of the first precursor source  125  to the flow through the first precursor line  113  and the gas line  103  into the chamber inlet  110 . The second valve  121  and the third valve  123  are in a closed state. TMA flowing across the processing region  120  flows across the substrate  134  and forms a layer of TMA on the substrate  134 . A flow of oxygen-containing gas, i.e, the second precursor, is delivered to the processing region  120 . The second valve  121  in an open state enabling the second precursor of the second precursor source  127  to the flow through the second precursor line  115  and the gas line  103  into the chamber inlet  110 . The first valve  119  and the third valve  123  are in a closed state. The oxygen-containing gas flowing across the processing region  120  flows across the substrate  134  and is activated into a plasma to provide oxygen radicals for a reaction with the layer of TMA. In one embodiment, the oxygen-containing gas is O 2  or ozone (O 3 ). The oxygen radicals react with the layer of TMA on the substrate  134 , forming a layer of Al 2 O 3 . Repetition of a cycle the flowing TMA, the flowing of the oxygen-containing gas, and the activating the oxygen-containing gas into a plasma to form additional layers on the substrate  134  continues until an Al 2 O 3  film having a desired thickness is formed. 
     In an exemplary zirconium dioxide (ZrO 2 ) film forming process, a flow of TEMAZ, i.e, the first precursor, is delivered to the processing region  120 . The first valve  119  in an open state enabling the first precursor of the first precursor source  125  to the flow through the first precursor line  113  and the gas line  103  into the chamber inlet  110 . The second valve  121  and third valve  123  are in a closed state. The TEMAZ flowing across the processing region  120  flows across the substrate  134  and forms a layer of TEMAZ on the substrate  134 . A flow of oxygen-containing gas, i.e, the second precursor, is delivered to the processing region  120 . The second valve  121  in an open state enabling the second precursor of the second precursor source  127  to the flow through the second precursor line  115  and the gas line  103  into the chamber inlet  110 . The first valve  119  and the third valve  123  are in a closed state. The oxygen-containing gas flowing across the processing region  120  flows across the substrate  134  and is activated into a plasma to provide oxygen radicals for a reaction with the layer of TEMAZ. The oxygen radicals react with the layer of TEMAZ on the substrate  134 , forming a layer of ZrO 2  on the substrate  134 . Repetition of a cycle flowing TEMAZ, the flowing O 2 , and the activating the oxygen-containing gas into a plasma continues until a ZrO 2  film having a desired thickness is formed. The controller  136  is configured to control the first precursor valve, the second precursor valve, the purge valve, and the inert gas valve. 
     Each cycle has a fixed deposition rate. The deposition rate is fixed such that each cycle forms an atomically deposited layer. For example, the deposition rate for the exemplary zirconium dioxide (ZrO2) film forming process is about 1.1 to about 1.2 micrometers per cycle (μm/cycle). The deposition rate is fixed such that each cycle forms an atomically deposited layer. Prior to each flow of the first precursor and prior to each flow of the second precursor, a purge operation is performed. The purge operation includes delivering a flow of the inert gas to the processing region  120 . The flow of the inert gas prior to the flow of the first precursor in an initial cycle purges, i.e., removes, contaminants from the processing region  120 . The flow of the inert has prior to the flow of the first precursor in a subsequent cycle purges contaminants and residuals of the second precursor from the processing region  120 . The flow of the inert gas prior to the flow of the second precursor, purges contaminants and residuals of the first precursor from the processing region  120 . 
     As shown in  FIG.  1   , to purge the processing region  120 , the third valve  123  in an open state enabling the inert gas of the inert gas source  129  to the flow through the inert gas line  117  and the gas line  103  into the chamber inlet  110 . The first valve  119  and the second valve  121  are in a closed state. The inert gas flows, as shown by a flow path  131 , from the inert gas source  129  through the inert gas line  117  and the gas line  103 , the chamber inlet  110 , the process kit inlet  122 , the flow guide  142 , the processing region  120 , the process kit outlet  124 , and the chamber outlet  112 . The inert gas is exhausted by the pump  126 . A portion of the inert gas flows in the first precursor line  113  and the second precursor line  115  before the first valve  119  and the second valve  121 , respectively. The portion of the inert gas in the first precursor line  113  and the second precursor line  115  increases a total purge time of the purge operation. 
     The total purge time utilizing gas the gas supply system  101  is represented by a function, total purge time=t gas line +t processing region . t gas line  is a period of time required to exhaust the inert gas from the gas line  103  and the portion of the inert gas flows in the first precursor line  113  and the second precursor line  115 . t processing region  is a period of time required to exhaust the inert gas from the processing region  120 . As the deposition rate of each cycle is fixed, the total purge time factors into cycle time, and thus controls processing throughput. The purge efficiency, i.e., total purge time, of the gas supply system  101  is a result of the volume of the processing region  120  and volume of the gas line  103  including and the portion of the inert gas the first precursor line  113  and the second precursor line  115 . Furthermore, the diffuser  144  of the flow guide  142  restricts the purge efficiency. Accordingly, a gas supply system  401  and a method  500  are utilized to increase purge efficiency and increase processing throughput. 
       FIG.  4 A  and  FIG.  4 B  are schematic cross-sectional views of an ALD chamber  100  having a gas supply system  401 . As shown in  FIG.  4 A , the gas supply system  401  is in a purge state. As shown in  FIG.  4 B , the gas supply system  401  is in a first precursor supply state. The gas supply system  401  includes an inert gas line  402  and a precursor supply line  403 . The precursor supply line  403  includes a precursor outlet  405 , a first precursor inlet  407 , a second precursor inlet  409 , and a purge outlet  411 . The precursor outlet  405  is configured to be coupled to a precursor opening  436  the chamber inlet  110  of the lid assembly  104 . The first precursor inlet  407  is in fluid communication with a first precursor line  413 . The first precursor line  413  is coupled to a first precursor source  425  and includes a first precursor valve  419 . The first precursor valve  419  in an open state, as shown in  FIG.  4 B , enables a first precursor of the first precursor source  425  to flow through the first precursor line  413  and the precursor supply line  403  into the chamber inlet  110 . The second precursor inlet  409  is in fluid communication with a second precursor line  415 . The second precursor line  415  is coupled to a second precursor source  427  and includes a second precursor valve  421 . The second precursor valve  421  in an open state enabling a second precursor of the second precursor source  427  to flow through the second precursor line  415  and the precursor supply line  403  into the chamber inlet  110 . The purge outlet  411  is in fluid communication with a purge line  417 . The purge line  417  is coupled to a pump  429  and includes a purge valve  423 . The purge valve  423  in an open state enabling an inert gas of the inert gas source  404  to the flow through chamber inlet  110  and the precursor supply line  403  and to be exhausted by the pump  429 . The inert gas flowing through the precursor supply line  403  purges contaminants and residuals of the first and second precursors from the processing region  120 . 
     The inert gas line  402  includes an outlet  408  configured to be coupled to an inert gas opening  434  of the chamber inlet  110  of the lid assembly  104 . The inert gas line  402  is coupled to the inert gas source  404 . An inert gas valve  406  is disposed between the inert gas line  402  and the inert gas source  404 . The inert gas valve  406  in an open state enabling the inert gas to the flow through the precursor supply line  403  and the outlet  408  into the chamber inlet  110 . Additionally, according to embodiments, which can be combined with other embodiments described herein, each of the first precursor source  425 , the second precursor source  427 , and the inert gas source  404  have mass flow controllers (not shown) to provide desired flow rates to the ALD chamber  100  during processing. 
     As shown in  FIG.  4 A , to purge the processing region  120 , the inert gas valve  406  is in an open state enabling the inert gas of the inert gas source  404  to flow through the inert gas line  402  and the outlet  408  into the chamber inlet  110 . The first precursor valve  419  and the second precursor valve  421  are in a closed state. The purge valve  423  is in an open state. The inert gas flows, as shown by the flow path  431  and the flow path  432 , from the inert gas source  404  through the inert gas line  402  into the chamber inlet  110 . The inert gas of the flow path  431  flows through the process kit inlet  122 , the flow guide  142 , the processing region  120 , the process kit outlet  124 , and the chamber outlet  112 . The inert gas of the flow path  431  is exhausted by the pump  126 . The gas supply system  401  with the purge valve  423  is in an open state provide for the inert gas of the flow path  432  to flow through chamber inlet  110  and the precursor supply line  403  and to be exhausted by the pump  429 . 
     The total purge time utilizing gas the gas supply system  401  is represented by a function, total purge time=maximum (t precursor supply line , t processing region ). t precursor supply line  is a period of time required to exhaust the inert gas from precursor supply line  403 . t processing region  is a period of time required to exhaust the inert gas from the processing region  120 . As the deposition rate of each cycle is fixed, the total purge time factors into cycle time, and thus controls processing throughput. The purge efficiency, i.e., total purge time, of the gas supply system  401  is a result of the volume of the processing region  120  and volume of the inert gas line  402 . Compared to the gas line  103 , the volume of the inert gas line  402  is significantly reduced. As the inert gas line  402  is configured to be coupled to the chamber inlet  110  separate from the precursor supply line  403 , the inert gas is supplied concurrently to the precursor supply line  403  and the processing region  120  such that total purge time is the maximum of t precursor supply line  and t processing region . The reduction of the total purge time due to the gas supply system  401  increases purge efficiency and increases processing throughput. Furthermore, as described in the method  500 , the gas supply system  401  allows the inert gas to be utilized as a dilution gas during the flow of the first precursor and the flow of the second precursor. 
       FIG.  5    is a flow diagram of a method  500  of forming an ALD film utilizing the gas supply system  401 . At operation  501 , a purging process is performed. As shown in  FIG.  4 A , the inert gas valve  406  is in an open state enabling the inert gas of the inert gas source  404  to flow through the inert gas line  402  and the outlet  408  into the chamber inlet  110 . The first precursor valve  419  and the second precursor valve  421  are in a closed state. The purge valve  423  is in an open state. The inert gas flows from the inert gas source  404  through the inert gas line  402  into the chamber inlet  110 . A portion of the inert gas has a flow path  431  through the process kit inlet  122 , the flow guide  142 , the processing region  120 , the process kit outlet  124 , and the chamber outlet  112 . The inert gas of the flow path  431  is exhausted by the pump  126 . Another portion of the inert gas has a flow path  432 , the gas supply system  401  with the purge valve  423  is in an open state provides for the inert gas of the flow path  432  to flow through chamber inlet  110  and the precursor supply line  403  and to be exhausted by the pump  429 . 
     At operation  502 , a first precursor is delivered to the processing region  120 . As shown in  FIG.  4 A , the first precursor valve  419  in an open state enabling a first precursor of the first precursor source  425  to the flow through the first precursor line  413  and the precursor supply line  403  into the chamber inlet  110 . The second precursor valve  421  and purge valve  423  are in a closed state. The inert gas valve  406  is in an open state enabling the inert gas of the inert gas source  404  to flow through the inert gas line  402  and the outlet  408  into the chamber inlet  110 . The inert gas mixes with the first precursor in the chamber inlet  110 . The inert gas mixing with the first precursor dilutes the first precursor such that the first precursor is provided uniformly across the substrate  134 . The diluted first precursor has a flow path  433  through the process kit inlet  122 , the flow guide  142 , the processing region  120 , the process kit outlet  124 , and the chamber outlet  112 . Delivering the first precursor to the processing region  120  forms a first precursor layer on the substrate  134 . At operation  503 , the purging process is performed. 
     At operation  504 , a second precursor is delivered to the processing region  120 . The second precursor valve  421  in an open state enabling a second precursor of the second precursor source  427  to the flow through the second precursor line  415  and the precursor supply line  403  into the chamber inlet  110 . The first precursor valve  419  and purge valve  423  are in a closed state. The inert gas valve  406  is in an open state enabling the inert gas of the inert gas source  404  to flow through the inert gas line  402  and the outlet  408  into the chamber inlet  110 . The inert gas mixes with the second precursor in the chamber inlet  110 . The inert gas mixing with the second precursor dilutes the second precursor such that the second precursor is provided uniformly across the substrate  134 . The diluted second precursor has a flow path through the process kit inlet  122 , the flow guide  142 , the processing region  120 , the process kit outlet  124 , and the chamber outlet  112 . The second precursor is activated into a plasma to provide radicals for a reaction with the layer of the first precursor. The radicals react with the layer of the first precursor on the substrate  134 , forming a layer of ALD layer. Operations  501 - 504  are repeated to form additional ALD layers until an ALD film with a desired thickness is formed. 
     In summation, a gas supply system for reducing purge time and increasing processing throughput, and an atomic layer deposition (ALD) chamber having the same are provided. The utilization of the gas supply system provides of forming an ALD film with increased processing throughput due to the increase purge efficiency with the gas supply system. The purge efficiency, i.e., total purge time, of the gas supply system is a result of the volume of the processing space of the chamber and volume of the inert gas line. As the gas line of the gas supply system is configured to be coupled to the chamber inlet separate from a precursor supply line of the gas supply system, the inert gas is supplied concurrently to the precursor supply line and the processing region of the chamber such that total purge time is the maximum of t precursor supply line  and t processing region . The reduction of the total purge time due to the gas supply system increases purge efficiency and the utilization of the gas supply system during deposition provides for dilution of the precursor gas in-situ. 
     While the foregoing is directed to examples of the present disclosure, other and further examples of the disclosure may be devised without departing from the basic scope thereof, and the scope thereof is determined by the claims that follow.