Patent Publication Number: US-11649543-B2

Title: Target structure of physical vapor deposition

Description:
CROSS-REFERENCE TO RELATED APPLICATION 
     This application is a continuation of U.S. patent application Ser. No. 16/931,517, filed on Jul. 17, 2020, which is a continuation of U.S. patent application Ser. No. 15/882,899, filed on Jan. 29, 2018, and entitled “TARGET STRUCTURE OF PHYSICAL VAPOR DEPOSITION,” which claimed benefit to U.S. Provisional Appl. Ser. No. 62/527,156, filed on Jun. 30, 2017, and entitled “PVD TARGET,” each of which are incorporated by reference herein in their entireties. 
    
    
     BACKGROUND 
     Current physical vapor deposition (PVD) processes uses targets as the source of deposited materials. Depending on the process recipe, the target may be used to deposit one or more material at a time, for example, a metal and a compound containing the metal, in separate layers. However, disparate materials cannot be used by varying the process recipe. In order to deposit disparate materials, for example, AlCu and TiN, the workpiece must be transferred between different process chambers. In high temperature processing, the time and delay while transferring between chambers can affect material properties such as grain size and interfacial properties. 
    
    
     
       BRIEF DESCRIPTION OF THE FIGURES 
       Aspects of the present disclosure are best understood from the following detailed description when read with the accompanying figures. It is noted that, in accordance with the standard practice in the industry, various features are not necessarily drawn to scale. In fact, the dimensions of the various features may be arbitrarily increased or reduced for clarity of discussion. 
         FIG.  1    illustrates a double-sided target including a firsts sputtering target and a second sputtering target, in accordance with some embodiments. 
         FIG.  2    illustrates a chamber for vacuum deposition using the double-sided target of  FIG.  1   , in accordance with some embodiments. 
         FIG.  3 A  illustrates a side view of a rotation mechanism for rotating the double-sided target of  FIG.  1   , in accordance with some embodiments. 
         FIG.  3 B  illustrates a cross-sectional view of the rotation mechanism of  FIG.  3 A , in accordance with some embodiments. 
         FIG.  3 C  illustrates a side elevation cross-sectional view of the rotation mechanism of  FIG.  3 A , in accordance with some embodiments. 
         FIGS.  4 A- 4 C  illustrate a double-sided target in various orientations, in accordance with some embodiments. 
         FIG.  5    illustrates a deposition system including a plurality of deposition chambers each having double-sided sputtering targets located therein, in accordance with some embodiments. 
         FIG.  6    is a flow chart illustrating a method of vacuum deposition using a double-sided target, in accordance with some embodiments. 
     
    
    
     DETAILED DESCRIPTION 
     The following disclosure provides many different embodiments, or examples, for implementing different features of the subject matter. Specific examples of components and arrangements are described below to simplify the present disclosure. These are, of course, merely examples and are not intended to be limiting. For example, the formation of a first feature over or on a second feature in the description that follows may include embodiments in which the first and second features are formed in direct contact, and may also include embodiments in which additional features may be formed between the first and second features, such that the first and second features may not be in direct contact. In addition, the present disclosure may repeat reference numerals and/or letters in the various examples. This repetition is for the purpose of simplicity and clarity and does not in itself dictate a relationship between the various embodiments and/or configurations discussed. 
     In various embodiments, a double-sided sputtering target is disclosed. The double-sided sputtering target includes a first sputtering target having a first material and a second sputtering target having a second material. The first material can include a titanium-based material, such as TiN and the second material can include an aluminum alloy, such as AlCu. The first sputtering target is coupled to a first side of the double-sided sputtering target and the second sputtering target is coupled to a second side of the double-sided sputtering target. The double-sided sputtering target is configured to be received within a deposition chamber and coupled to a rotation mechanism. The rotation mechanism is configured to rotate the double-sided sputtering target during an in-situ deposition process. For example, in some embodiments, the in-situ deposition process can include a first deposition phase and a second deposition phase. The rotation mechanism can rotate the double-sided sputtering target between the first deposition phase and the second deposition phase. 
       FIG.  1    illustrates a double-sided sputtering target structure  2 , in accordance with some embodiments. The double-sided sputtering target structure  2  includes a rotation body  4 . A first side  6   a  of the rotation body  4  is configured to couple to a first sputtering target  8   a  and a second side  6   b  of the rotation body  4  is configured to couple to a second sputtering target  8   b . In some embodiments, each side  6   a ,  6   b  of the rotation body  4  has a recess  12  sized and configured to receive a sputtering target  8   a ,  8   b  therein. The recess  12  can include an inner perimeter configured to match an outer profile of a respective sputtering target  8   a ,  8   b.    
     In various embodiments, the perimeter  14  of the rotation body  4  can be any suitable shape. For example, a suitable shape of the perimeter can include a square shape, a rounded shape, an oblong shape, and/or any other suitable shape. The shape of the perimeter  14  can be the same shape as or different from the shape of the sputtering targets  8   a ,  8   b . For example, in the illustrated embodiment, the rotation body  4  defines a rectangular perimeter  14  and a circular recess  12  (corresponding to a circular perimeter of the sputtering targets  8   a ,  8   b ) although it will be appreciated that the rotation body  4  and/or the recess  12  can include any suitable geometric shape. 
     In some embodiments, the rotation body  4  defines at least one hole  16  extending from the first surface  6   a  of the body  4  to a second surface  6   b  of the body  4 . The at least one hole  16  is sized and configured to receive a retention device  18  therein. For example, in some embodiments, the at least one hole  16  is sized and configured to receive a magnet, a post, and/or any other suitable retention device. The hole  16  can be positioned in a center of the rotation body  4  and extend into the recesses  12  defined by the body  4 . In other embodiments, the at least one hole  16  can be positioned off-center and/or outside of the recesses  12 . Although embodiments are illustrated including at least one hole  16 , it will be appreciated that in some embodiments the at least one hole  16  can be omitted and alternative retention devices can be used. 
     In some embodiments, a retention device  18  is positioned through the at least one hole  16  to maintain the sputtering targets  8   a ,  8   b  in a fixed position within the respective recess  12 . The retention device  18  can include a first magnetic plate  20   a  and a second magnetic plate  20   b  coupled between the rotation body  4  and the sputtering targets  8   a ,  8   b . The first magnetic plate  20   a  and the second magnetic plate  20   b  can be coupled by a shaft  22  sized and configured to be inserted through the hole  16 . The shaft  22  and the hole  16  center the magnetic plates  20   a ,  20   b  within the recesses  12  defined by the body  4 . The magnetic plates  20   a ,  20   b  can include permanent magnets and/or electromagnets. Although magnetic plates  20   a ,  20   b  are illustrated, it will be appreciated that any suitable magnetic structure, such as concentric magnetic rings, concentrically disposed independent magnets, and/or any other suitable magnetic structures can be used and are within the scope of this disclosure. In some embodiments, the geometry of the magnetic plates  20   a ,  20   b  is complimentary to a geometry of the sputtering targets  8   a ,  8   b . In some embodiments, the magnetic plates  20   a ,  20   b  can include an adhesive coating on at least one side configured to couple to a non-magnetic surface, such as a non-magnetic sputtering target and/or a non-magnetic rotation body  4 . 
     In some embodiments, the first sputtering target  8   a  is coupled to a first side  6   a  of the rotation body  4  and the second sputtering target  8   b  is coupled to a second side  6   b  of the rotation body  4 . The first and second sputtering targets  8   a ,  8   b  can have any suitable shape, such as a circular shape, a ring shape, and/or any other suitable shape. The sputtering targets  8   a ,  8   b  have a predetermined thickness configured to provide a predetermined amount of sputtering before needing to be replaced. In some embodiments, the first and second sputtering targets  8   a ,  8   b  include different materials. The materials of the sputtering targets  8   a ,  8   b  provide a source material to the surface of a substrate during a sputtering process. In some embodiments, the material of the sputtering target  8   a ,  8   b  is provided directly to the surface of the substrate. In other embodiments, the source material from the sputtering target  8   a ,  8   b  is combined with one or more additional materials, for example a gaseous material or plasma provided within a deposition chamber, to generate a deposited material. 
     In some embodiments, the first sputtering target  8   a  and/or the second sputtering target  8   b  can include one or more selected materials. For example, in some embodiments, the first and/or the second sputtering target  8   a ,  8   b  can include titanium (Ti), titanium nitride (TiN), an aluminum alloy, such as an aluminum copper alloy (AlCu), an aluminum (Al) alloy, a platinum (Pt) alloy, cobalt (Co), etc. In some embodiments, the first sputtering target  8   a  includes a first material, such as Ti, and the second sputtering target  8   b  includes a second material, such as AlCu, although it will be appreciated that other combinations are possible. The one or more materials can be selected to form a predetermined pattern and/or structure on a work-piece, as discussed in more detail below. 
     In some embodiments, the rotation body  4  includes one or more rotation mechanisms  24   a ,  24   b . The rotation mechanisms  24   a ,  24   b  are configured to rotatably couple the rotation body  4  to a structure, such as the deposition chamber  100  discussed below with respect to  FIG.  2   . The one or more rotation mechanisms  24   a ,  24   b  can include a shaft  26  extending from one or more of the side walls  14   a ,  14   b  of the rotation body  4 . In some embodiments, the rotation mechanisms  24   a ,  24   b  are aligned on a single rotational axis  30  extending through a center of the rotation body  4 . Although embodiments are illustrated including rotation shafts  26 , it will be appreciated that any suitable rotation mechanism can be used. 
     The double-sided sputtering target structure  2  is configured to be positioned within a deposition chamber, as discussed in more detail below. The rotation mechanisms  24   a ,  24   b  are configured to allow rotation of the rotation body  4  from a first orientation to a second orientation within the deposition chamber. In some embodiments, the first orientation includes the first sputtering target  8   a  in a down (or in-use) orientation and the second sputtering target  8   b  in an up (or non-use) orientation and the second orientation includes the second sputtering target  8   b  in the down orientation and the first sputtering target  8   a  in the up orientation. Although specific orientations and embodiments are discussed herein, it will be appreciated that the first orientation and/or the second orientation can position the first and second sputtering targets  8   a ,  8   b  in any suitable orientation such that the first and second sputtering targets  8   a ,  8   b  are segregated during a deposition process such that only a single sputtering target  8   a ,  8   b  (e.g., single source) is used during a deposition process. 
       FIG.  2    illustrates a chamber  100  for PVD sputtering configured to receive the double-sided target structure  2 , in accordance with some embodiments. The chamber  100  includes a chamber body  102  defining a target receiving area  104  and a work-piece receiving area  106 . In some embodiments, the target receiving area  104  is disposed above the work-piece receiving area  106 , although it will be appreciated that other orientations are possible. The target receiving area  104  is sized and configured to receive the double-sided target structure  2  therein. The work-piece receiving area  106  is sized and configured to receive a work-piece  130 , such as a substrate therein. The work-piece  130  is configured to receive one or more layers of material through PVD sputtering. 
     In some embodiments, the double-sided target structure  2  is maintained within the target receiving area  104  by rotation mechanisms  24   a ,  24   b . The rotation mechanisms  24   a ,  24   b  maintain the double-sided target structure  2  in a fixed longitudinal, horizontal, and vertical position within the receiving area  104  while allowing rotation of the double-sided target structure  2  along an axis of rotation. The chamber body  102  can include one or more rotation elements configured to interface with the rotation mechanisms  24   a ,  24   b  of the rotation body  4 . For example, in the illustrated embodiment, the rotation mechanisms  24   a ,  24   b  include rotation shafts extending from the rotation body  4  through a portion of the chamber body  102  defining the receiving area  104 . The chamber body  102  can include complimentary rotation elements, such as bushings, bearings, gears, etc. configured to couple the rotation mechanisms  24   a ,  24   b  to the chamber body  102 . The complimentary rotation elements can be selected based on the rotation mechanism  24   a ,  24   b  of the double-sided sputtering target structure  2 . 
     In some embodiments, the work-piece receiving area  106  includes a pedestal  110  sized and configured to receive a work-piece  130  thereon. The pedestal  110  positions the work-piece  130  at a predetermined distance from a selected one of the sputtering targets  8   a ,  8   b  positioned in an opposed facing relationship with the work-piece  130 . For example, in some embodiments, the sputtering target  8   a ,  8   b  coupled to a down-facing side  6   a  of the body  4  is positioned in an opposed facing relationship with the work-piece  130 . The pedestal  110  positions the work-piece  130  at a predetermined vertical distance from the selected one of the sputtering targets  8   a ,  8   b.    
     In some embodiments, the double-sided target structure  2  is maintained in a predetermined vertical position with respect to the pedestal  110  such that the rotation body  4  can be rotated from a first orientation to a second orientation without contacting and/or otherwise interacting with a work-piece  130  positioned on the pedestal  110 . In embodiments, the distance between the double-sided target structure  2  and the pedestal  110  can be adjustable, for example, by raising or lowering the double-sided target structure  2  and/or the pedestal  110  to provide sufficient clearance for rotation of the double-sided target structure  2 . For example, in some embodiments, the pedestal  110  is vertically adjustable to a minimum spacing with respect to the double-sided target structure  2  substantially equal to half the width of the rotation body  4  plus the thickness of a work-piece placed on the pedestal  110 , although it will be appreciated that a greater spacing is can be provided to allow additional clearance between the rotation body  4  and the work piece  130 . The pedestal  110  can be vertically lowered to a bottom of the work-piece receiving area  106 . A robotic arm (not shown) delivers a work-piece  130  into the work-piece receiving area  106 . The pedestal  110  is raised to support the work-piece  130  and the robotic arm is withdrawn. The pedestal  110  can be additionally adjusted prior to and/or during a sputtering process. In other embodiments, the double-sided target structure  2  is removed from the target receiving area  104 , rotated, and repositioned within the target receiving area  104 . In some embodiments, the distance between the work-piece  130  and the double-sided target structure  2  is selected to optimize a PVD sputtering process and/or is adjustable during a sputtering process. 
     In some embodiments, a drive mechanism  112  is positioned to interface with one of the rotation mechanisms  24   a ,  24   b  of the double-sided target structure  2 . The drive mechanism  112  is configured to rotate the double-sided target structure  2  from a first orientation to a second orientation. The drive mechanism  112  can include any suitable drive mechanism, such as a motor or other mechanical drive mechanism, a hand-drive mechanism such as a crank, and/or any other suitable mechanism. The drive mechanism  112  is coupled to an outer surface of the chamber body  102  and is configured to rotatably couple to the double-sided target structure  2 . The drive mechanism  112  is isolated from the receiving area  104  by a wall of the chamber body  102  and/or one or more complimentary rotation elements. 
     In operation, the double-sided target structure  2  can be positioned with the first sputtering target  8   a  in an opposed relationship with the work-piece  130  to deposit a first material layer on the work-piece  130 . After depositing the first material layer, the double-sided target structure  2  can be rotated to position the second sputtering target  8   b  in an opposed relationship with the work-piece  130 . A second material layer is deposited over the first material layer. In other embodiments, the second material layer may be deposited prior to the first material layer (i.e., the first material layer is deposited over the second material layer). The first and second material layers are deposited in the same chamber  100  and are deposited without needing to open or interact with the interior of the chamber  100 . In some embodiments, the first material layer and the second material layer are deposited without cleaning the deposition chamber  100  between material layers. 
     In some embodiments, the drive mechanism  112  is coupled to a controller  114  configured to control operation of the drive mechanism  112 . The controller  114  can include any suitable controller, such as a microcontroller, field programmable gate-array, application specific integrated circuit (ASIC), programmable logic controller (PLC), and/or any other suitable controller. The controller  114  is configured to operate the drive mechanism  112  to rotate the double-sided target structure  2  in response to one or more predetermined process conditions, such as an elapsed time, a thickness of a deposited material, a predetermined deposition profile, and/or any other suitable process condition and/or user input. For example, in some embodiments, the controller  114  maintains the double-sided target structure  2  in a first orientation for a first predetermined time period. After the first predetermined time period has elapsed, the controller  114  is configured to activate the drive mechanism  112  to rotate the double-sided target structure  2  to a second orientation. 
     In some embodiments, the controller  114  is configured to rotate the double-sided target structure  2  in a predetermined pattern. For example, in some embodiments, the controller  114  is configured to maintain the double-sided target structure  2  in a first orientation having the first sputtering target  8   a  in an opposed relationship with the work-piece  130 . The controller  114  maintains the first orientation for a first predetermined deposition period during which a PVD process deposits a predetermined thickness of the first material  8   a  on the work-piece  130 . After the first predetermined deposition period, the controller  114  activates the drive mechanism  112  to rotate the double-sided target structure  2  to a second orientation having the second sputtering target  8   b  in an opposed relationship with the work-piece  130 . The controller  114  maintains the double-sided target structure  2  in the second orientation for a second predetermined deposition period. After the second predetermined deposition period has elapsed, the controller  114  can be activated to rotate the double-sided target structure  2  back to the first orientation to allow for additional sputtering of the first material  8   a . It will be appreciated that the controller  114  can be configured to rotate the double-sided target structure  2  any number of times to achieve a predetermined profile on the work-piece  130 . 
     In comparison with other approaches, the double-sided targeting structure  2  provides for an in-situ deposition process that reduces manufacturing time and prevents particle contamination during deposition, thereby increasing reliability and improving product yield. For example, the double-sided targeting structure  2  and associated chamber  100  reduce the number of sputtering target transfers required for each deposition process and reduces the number of process tools required. In some instances, a single double-sided targeting structure  2  can be used to perform a complete deposition and replaces three or more sputtering target transfers in other approaches. The disclosed double-sided targeting structure  2  and associated chamber  100  further provide an improvement in cycle time as compared to other approaches. For example, in some embodiments, a cycle time improvement of up to 80% may be realized using the double-sided targeting structure  2 . 
       FIGS.  3 A- 3 C  illustrate a double-sided target structure  2   a  positioned within the receiving area  104  of a deposition chamber  100   a , in accordance with some embodiments. The double-sided target structure  2   a  and the deposition chamber  100   a  are respectively similar to the double-sided target structure  2  and deposition chamber  100  discussed above, and similar description is not repeated herein. A first rotation mechanism  24   a  of the double-sided target structure  2   a  is coupled to a rotation driver  120 . The rotation driver  120  is configured to allow rotation of the rotatable body  4  of the double-sided target structure  2   a  from a first orientation to a second orientation. In some embodiments, the rotation driver  120  includes a driver  122  coupled to the rotation mechanism  24   a  by a coupling mechanism  124 . The coupling mechanism  124  can include any suitable coupling mechanism configured to permanently and/or releaseably couple the handle  112  to the rotation mechanism  24   a.    
     In some embodiments, the coupling mechanism  124  includes a servomotor coupling mechanism configured to couple the driver  122  to a servomotor (not shown) configured to control rotation of the double-sided target structure  2   a . The coupling mechanism  124  can include one or more gears configured to couple to the servomotor. In some embodiments, the servomotor is configured to control rotation of the double-sided target structure  2   a  in accordance with one or more predetermined deposition patterns. 
     In some embodiments, the double-sided target structure  2   a  includes a planar rotation assembly  140  including a motor  142  and a gear rod  144 . The planar rotation assembly  140  is configured to control planar rotation of the first magnet  20   a  and/or the second magnet  20   b . Planar rotation of the magnets  20   a ,  20   b  results in planar rotation of the respective first material  8   a  and/or second material  8   b  coupled to the magnet  20   a ,  20   b  in a plane defined by a target surface of the material  8   a ,  8   b . Planar rotation of the target materials  8   a ,  8   b  increases deposition uniformity during a deposition process. In some embodiments, the motor  142  is a step motor configured to rotate the gear rod  144  about a longitudinal axis. The gear rod  144  is coupled to rotation elements  146   a ,  146   b  coupled to respective first and second magnets  20   a ,  20   b . Rotation of the gear rod  144  about a longitudinal axis is translated to planar rotation of the respective materials  8   a ,  8   b . Although embodiments are illustrated herein having a motor  142  and a gear rod  144 , it will be appreciated that any suitable planar rotation system can be configured to rotate the first material  8   a  and/or the second material during deposition. 
       FIGS.  4 A- 4 C  illustrate a double-sided target structure  2   b  in various rotational orientations, in accordance with some embodiments.  FIG.  4 A  illustrates the double-sided target structure  2   b  in a first orientation having a first sputtering target  8   a  positioned for a deposition process, such as a PVD process. For example, in some embodiments, the first sputtering target  8   a  can be positioned in an opposed (or facing) orientation with a work-piece configured to have at least one material layer formed thereon during the deposition process, as discussed above with respect to  FIG.  2   . The first sputtering target  8   a  can include any suitable deposition material, such as, for example, titanium. 
       FIG.  4 B  illustrates the double-sided target structure  2   b  in a partially-rotated position. The double-sided target structure  2   b  includes a rounded rotation body  4   a . The double-sided target structure  2   b  is rotated from the first orientation shown in  FIG.  4 A , through the partially-rotated position shown in  FIG.  4 B , and fully rotated to the second orientation shown in  FIG.  4 C . In the second orientation illustrated in  FIG.  4 C , a second sputtering target  8   a  is positioned in an opposed orientation with the work-piece. The second sputtering target  8   a  can include any suitable deposition material, such as, for example, an aluminum alloy (e.g., AlCu). 
     In some embodiments, each of the sputtering targets  8   a ,  8   b  can have a predetermined deposition topography configured for deposition of the respective deposition material. For example, as shown in  FIGS.  4 A &amp;  4 C , the sputtering targets  8   a ,  8   b  can include a plurality of peaks  50  and valleys  52  defining a predetermined deposition topography, although it will be appreciated that other topographical features can be added to the sputtering targets  8   a ,  8   b  to obtain a predetermined deposition topography. 
       FIG.  5    illustrates a deposition system  200  including a plurality of deposition chambers  202   a - 202   d  each having double-sided sputtering targets  2   c - 1 - 2   c - 4  (collectively “double-sided sputtering targets  2   c ”) located therein, in accordance with some embodiments. The plurality of deposition chambers  202   a - 202   d  are arranged concentrically about a frame  204  of the deposition system  200 . Each of the deposition chambers  202   a - 202   d  are positioned at a respective opening  206   a - 206   d  in the frame  204 . The openings  206   a - 206   d  are sized and configured to receive a work-piece  208   a - 208   b  therethrough. 
     In some embodiments, a pick-and-place mechanism  210  is positioned within the frame  204 . The pick-and-place mechanism  210  is configured to retrieve a work-piece  208   a ,  208   b  from a first staging area  212   a  and place the work-piece in a predetermined position within a selected one of the plurality of deposition chambers  202   a - 202   d . In some embodiments, the pick-and-place mechanism  210  is configured to place a work-piece  208   a ,  208   b  on a pedestal located within the deposition chamber  202   a - 202   d  (see  FIG.  2   ). 
     Each of the deposition chambers  202   a - 202   d  include a double-sided sputtering target structure  2   c  therein. The double-sided sputtering targets  2   c  are similar to the double-sided sputtering targets  2 ,  2   a ,  2   b  discussed above, and similar description is not repeated herein. In some embodiments, each of the double-sided sputtering targets  2   c  are coupled to independent drive mechanisms configured to independently rotate a respective sputtering target structure  2   c . When a work-piece  208   a ,  208   b  is inserted into a selected one of the deposition chambers  202   a - 202   d , a deposition process is performed using the associated one of the sputtering targets  2   c . For example, in some embodiments, a first material layer is formed on the work-piece  208  from a first side of the associated double-sided sputtering target structure  2   c . After the first material is deposited, the associated sputtering target structure  2   c  is rotated, and a second material layer is deposited on the work piece  208  from a second side of the associated double-sided sputtering target structure  2   c.    
     In some embodiments, the pick-and-place mechanism  210  is configured to remove a selected work-piece  208  from one of the deposition chambers  202   a - 202   d  after a deposition process has completed. For example, in some embodiments, the pick-and-place mechanism  210  is configured to retrieve a selected work-piece  208  from the selected one of the deposition chambers  202   a - 202   d  and move the work-piece  208  to a second staging area  212   b . The pick-and-place mechanism  210  is operated by an independent controller and/or by a controller configured to operate one or more of the rotation mechanisms of the deposition chambers  202   a - 202   d.    
       FIG.  6    illustrates a method  300  of PVD deposition using a double-sided sputtering target, in accordance with some embodiments. At step  302 , a double-sided sputtering target structure  2  is positioned within a deposition chamber  100 . The double-sided sputtering target structure  2  includes a first sputtering target  8   a  coupled to a first side and a second sputtering target  8   b  coupled to a second side. Each of the first and second sputtering targets  8   a ,  8   b  include a selected deposition (or source) material. One or more rotation mechanisms  24   a ,  24   b  extend from the rotatable body  4  and interface with complimentary rotation elements formed in the deposition chamber  100 . 
     At step  304 , a work-piece  130  is positioned on a pedestal  110  within the deposition chamber  100 . The work-piece  130  is configured to receive one or more material layers through a deposition process, such as a PVD process. In some embodiments, the work-piece  130  can be positioned by a pick-and-place mechanism  210 . 
     At step  306 , the double-sided sputtering target structure  2  is positioned in a first orientation. In the first orientation, the first sputtering target  8   a  is placed in an opposed (e.g., facing) relationship with the work-piece  130 . The second sputtering target  8   b  is positioned away from, and segregated from, the work-piece  130  in the first orientation. In some embodiments, a face of the first sputtering target  8   a  substantially defines a first plane and a face of the work-piece  130  substantially defines a second plane. The first and second planes are parallel. 
     At step  308 , a deposition process deposits a first material layer on the work-piece  130 . The first material layer is formed by sputtering the first material from the first sputtering target  8   a . In some embodiments, the deposition process deposits the first material layer to a predetermined thickness. 
     At step  310 , the double-sided sputtering target structure  2  is rotated from the first orientation to a second orientation. The second orientation positions the second sputtering target  8   b  in an opposed (e.g., facing) arrangement with the work-piece  130 . In some embodiments, the double-sided sputtering target structure  2  is rotated by a drive mechanism, such as a motor, coupled to one or more of the rotation mechanisms  24   a ,  24   b  of the double-sided sputtering target structure  2 . In some embodiments, the double-sided sputtering target structure  2  is manually rotated by a manual rotation mechanism coupled to one of the rotation mechanisms  24   a ,  24   b . The first sputtering target  8   a  is positioned away from, and segregated from, the work-piece  130  in the second orientation. 
     At step  312 , a deposition process deposits a second material layer on the work-piece  130 . The second material layer is formed by sputtering the second material from the second sputtering target  8   b . In some embodiments, the deposition process deposits the second material layer to a predetermined thickness. 
     At optional step  314 , the double-sided sputtering target structure  2  is rotated from the current orientation, e.g., the second orientation, to an opposite orientation, e.g., the first orientation. The double-sided sputtering target structure  2  can be rotated by any suitable mechanism, such as the drive mechanism and/or the manual rotation mechanism discussed above. 
     At optional step  316 , a deposition process deposits an additional material layer on the work-piece  130 . The additional material layer is formed by sputtering a material from a selected sputtering target  8   a ,  8   b  (i.e., a selected sputtering target positioned in an opposing relationship with the work-piece  130 .) The method  300  can repeat steps  314  and  316  to deposit any number of additional layers from any combination of the first and second targets  8   a ,  8   b.    
     At step  318 , the work-piece  130  is removed from the deposition chamber  100 . The work-piece  130  can be provided to additional chambers configured to deposit additional and/or alternative material layers, can be placed in a waiting area, and/or can be provided for additional processing. In some embodiments, the work-piece  130  is removed from the chamber  100  by a pick-and-place mechanism. 
     In various embodiments, a sputtering target structure is disclosed. The sputtering target structure includes a body having a first side and an opposing second side. A first sputtering target is coupled to the first side of the body. The first sputtering target includes a first material. A second sputtering target is coupled to the second side of the body. The second sputtering target includes a second material. A rotation mechanism is coupled to the body and is configured to rotate the body. 
     In various embodiments, a system is disclosed. The system includes a deposition chamber having a target receiving area and a work-piece receiving area. A double-sided sputtering target structure is positioned within the target receiving area. The double-sided sputtering target structure includes a body having a first side and an opposing second side. A first sputtering target is coupled to the first side of the body. The first sputtering target includes a first material. A second sputtering target is coupled to the second side of the body. The second sputtering target includes a second material. A rotation mechanism is configured to rotatably couple the double-sided sputtering target structure within the deposition chamber. The rotation mechanism is configured to rotate the double-sided sputtering target structure. 
     In various embodiments, a method of sputtering is disclosed. The method includes disposing a double-sided sputtering target structure in a deposition chamber. The double-sided sputtering target structure includes a body extending between a first side and an opposing second side, a first sputtering target coupled to the first side of the body, and a second sputtering target coupled to the second side of the body. The first sputtering target includes a first material and the second sputtering target includes a second material. A work-piece is positioned in the deposition chamber. The work-piece is positioned in an opposed facing relationship with the first sputtering target. A first material layer is formed on the work-piece by sputtering material from the first sputtering target. The double-sided sputtering target structure is rotated to position the second sputtering target in the opposed facing relationship with the work-piece. A second material layer is formed on the work-piece by sputtering material from the second sputtering target. 
     The foregoing outlines features of several embodiments so that those skilled in the art may better understand the aspects of the present disclosure. Those skilled in the art should appreciate that they may readily use the present disclosure as a basis for designing or modifying other processes and structures for carrying out the same purposes and/or achieving the same advantages of the embodiments introduced herein. Those skilled in the art should also realize that such equivalent constructions do not depart from the spirit and scope of the present disclosure, and that they may make various changes, substitutions, and alterations herein without departing from the spirit and scope of the present disclosure.