Abstract:
A method of performing an ion implantation is provided. A workpiece is installed in the ion implanter. A wafer is provided in a receiving space within an ion implanter. An ion beam is generated by an ion source of the ion implanter. The bombard of the ion beam is blocked and particles generated during or after conducting the step of generating the ion beam are collected by the workpiece.

Description:
CROSS-REFERENCE TO RELATED APPLICATION 
       [0001]    This is a continuation application of and claims priority benefit of patent application Ser. No. 11/742,400, filed on Apr. 30, 2007. The entirety of the above-mentioned patent application is hereby incorporated by reference herein and made a part of this specification. 
     
    
     BACKGROUND OF THE INVENTION 
       [0002]    1. Field of the Invention 
         [0003]    The present invention relates to a method of performing an ion implantation. More particularly, the present invention relates to a method of performing an ion implantation using an ion beam blocking component and an ion beam blocking device having the same to collect particles generated when an ion beam impinges on an ion beam blocking component. 
         [0004]    2. Description of Related Art 
         [0005]    With the development of semiconductor technology, in a semiconductor manufacturing process, different specific impurities are added into a certain part or a certain film layer, and such a step is called doping and the added impurities are called dopants. Currently, the conventional doping methods can be substantially classified into a diffusion method and an ion implantation method. The diffusion method is usually called a thermal diffusion method since the impurities are self-diffused from a high concentration region to a low concentration region in a host material at high temperature (usually 800° C. or so), thereby achieving the doping purpose. With regard to the ion implantation method, the impurities are dissociated into ions firstly, and after acceleration and selection, specific ions are directly impinged into the host material, so as to achieve the doping purpose. 
         [0006]    A common ion implanter mainly includes an ion source, an analyzer, a Faraday flag, an electron shower, and a wafer disk assembly. The ion source is used to provide ions to be implanted, and the ions include different chemical elements and pass through a magnetic field in the analyzer. The analyzer selects some ions to impinge the wafer according to a generated mass to charge ratio of the ions, so as to perform ion implantation. The Faraday flag is a monitor element used to measure and prepare before the implant of ions. The Faraday flag is usually made of graphite. Before the ion implantation, the Faraday flag is used to block an ion stream. On the contrary, when the ions are being implanted, the Faraday flag is moved to allow the ions to impinge on the wafer. When at a closed position, the Faraday flag blocks the ion beam, thereby causing a secondary electron emission. Since the secondary electrons may cause an error in measuring an ion beam current, a magnet is attached on the Faraday flag, so as to prevent the secondary electrons from flowing out. The electron shower is used to neutralize charges of the wafer. The wafer disk assembly is used to fix the wafer and scan the wafer by the use of the ion beam. 
         [0007]    U.S. Pat. No. 5,998,798 discloses “ion dosage measurement apparatus for an ion beam implanter and method.” In the ion implanter, a movable restriction plate is attached to one end of the Faraday flag, and a gap exists between the Faraday flag and the restriction plate. The restriction plate is moved relative to the Faraday flag to adjust the quantity of the ion beams passed. However, since the restriction plate is a sheet-like structure, the particles impinged on the restriction plate will contaminate a traveling path of the ion beam and a chamber where the wafer is placed, thus degrading the yield of products. 
       SUMMARY OF THE INVENTION 
       [0008]    The present invention provides a method of performing an ion implantation to preventing the peeling phenomenon. 
         [0009]    The present invention provides a method of performing an ion implantation to reduce the contamination in the traveling path of the ion beam or the wafer under ion implantation to improve the yield of products. 
         [0010]    The present invention provides a method of performing an ion implantation to save time of replacing the ion beam blocking component. 
         [0011]    The present invention is directed to a method of performing an ion implantation. The method comprises a workpiece is installed in the ion implanter. A wafer is provided in a receiving space within an ion implanter. A wafer is provided in a receiving space within an ion implanter. An ion beam is generated by an ion source of the ion implanter. The bombard of the ion beam is blocked and particles generated during or after conducting the step of generating the ion beam are collected by the workpiece. 
         [0012]    In an embodiment of the present invention, the particles is collected by a plurality of particles attached regions on one surface of the workpiece. 
         [0013]    In an embodiment of the present invention, the workpiece is an ion beam blocking component. The ion beam blocking component includes a front plate, a back plate, and a plurality of side plates. The front plate has an at least one opening. The back plate has a plurality of grooves serving as the particles attached regions formed on one surface thereof facing the front plate. The side plates are connected between the front plate and the back plate, and a receiving space is formed between these plates. 
         [0014]    In an embodiment of the present invention, the grooves on the back plate are arranged in a horizontal direction. 
         [0015]    In an embodiment of the present invention, a plurality of grooves is formed on one surface of the front plate facing the ion beam. 
         [0016]    In an embodiment of the present invention, the grooves on the front plate are arranged in a horizontal direction. 
         [0017]    In an embodiment of the present invention, the depth of each of the grooves back plate is larger than the depth of each of the grooves of the front plate. 
         [0018]    In an embodiment of the present invention, the surfaces with the grooves of the back plate and the front plate are rough surfaces. 
         [0019]    In an embodiment of the present invention, the surfaces with the particles attached region of workpiece are rough surfaces. 
         [0020]    In an embodiment of the present invention, the front plate is made of a high-adhesive material. 
         [0021]    In an embodiment of the present invention, the material of the front plate includes graphite or metal coated with graphite. 
         [0022]    In an embodiment of the present invention, the back plate is made of a high hardness material. 
         [0023]    In an embodiment of the present invention, the material of the back plate includes graphite or metal coated with graphite. 
         [0024]    In an embodiment of the present invention, the front plate and the side plates are integrally formed. 
         [0025]    In an embodiment of the present invention, the front plate and the side plates are fixed on the back plate by means of locking or adhering. 
         [0026]    In an embodiment of the present invention, the step of the generating the ion beam is conducting a calibration mode of the ion implanter. 
         [0027]    In an embodiment of the present invention, the workpiece is an ion beam blocking device. The blocking device includes a plurality of ion beam blocking components. These ion beam blocking components are connected to an axle, and rotate around the axle. 
         [0028]    In an embodiment of the present invention, these ion beam blocking components form a polyhedron structure around the axle. 
         [0029]    In an embodiment of the present invention, these ion beam blocking components form a roulette-shape device with an axle. 
         [0030]    In an embodiment of the present invention, when one of the ion beam blocking components cannot be used any longer, rotating another ion beam blocking component around the axle to block a bombard of the ion beam. 
         [0031]    In view of the above, the particles peeled from the workpiece are collected by particles attached regions on one surface of the workpiece, so that the contamination in the traveling path of the ion beam or the wafer under ion implantation is reduced, thereby improving the yield of products. Furthermore, a plurality of particles attached regions is formed on the surfaces of the front plate and the back plate in a horizontal direction, so as to increase the surface area of the ion beam blocking components, thereby preventing the peeling phenomenon. 
         [0032]    Furthermore, the workpiece is an ion beam blocking device integrating a plurality of ion beam blocking components to form a polyhedron structure or a roulette-shape structure which can be rotated with an axle center as a rotating shaft. As such, when one of the ion beam blocking components cannot be used any longer, another ion beam blocking component can be rotated to block the bombard of the ion beam, so as to save time of replacing the ion beam blocking component. 
         [0033]    In order to the make aforementioned and other objects, features and advantages of the present invention comprehensible, a preferred embodiment accompanied with figures are described in detail below. 
         [0034]    It is to be understood that both the foregoing general description and the following detailed description are exemplary, and are intended to provide further explanation of the invention as claimed. 
     
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         [0035]    The accompanying drawings are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification. The drawings illustrate embodiments of the invention and, together with the description, serve to explain the principles of the invention. 
           [0036]      FIG. 1A  is a schematic view of the appearance of an ion beam blocking component according to an embodiment of the present invention. 
           [0037]      FIG. 1B  is a schematic cross-sectional view of the ion beam blocking component in  FIG. 1A . 
           [0038]      FIG. 2  is a schematic cross-sectional view of an ion beam blocking component according to another embodiment of the present invention. 
           [0039]      FIG. 3  is a schematic view of the appearance of an ion beam blocking component according to another embodiment of the present invention. 
           [0040]      FIG. 4  is a schematic view of the appearance of an ion beam blocking component according to another embodiment of the present invention. 
       
    
    
     DESCRIPTION OF EMBODIMENTS 
       [0041]      FIG. 1A  is a schematic view of the appearance of an ion beam blocking component according to an embodiment of the present invention, and  FIG. 1B  is a schematic cross-sectional view of the ion beam blocking component shown in  FIG. 1A . Referring to  FIGS. 1A and 1B , the ion beam blocking component  100  provided by the present invention is suitable for an ion implanter, so as to be applied in a Faraday flag or serve as an ion beam blocking plate. When the ion implanter is in a calibration mode, an ion beam generated by an ion source of the ion implanter may be blocked by the ion beam blocking component  100 . The ion beam blocking component  100  mainly includes a front plate  110 , a back plate  120 , and a plurality of side plates  130 . The structures of the elements and the connection relation therebetween will be described in accompanying with the drawings below. 
         [0042]    The front plate  110  has at least one opening  110   a , such that the ion beam can pass through the opening  110   a  to impinge on the back plate  120 . In this embodiment, for example, a single opening  110   a  is formed on the front plate  110 . However, a plurality of openings  110   a  can also be formed on the front plate  110  upon different requirements of users, as long as the openings  110   a  are at the same level, so as to prevent the falling particles dropping off through other openings  110   a.    
         [0043]    Furthermore, a plurality of the first grooves  112  may be selectively formed on one surface of the front plate  110  facing the ion beam, and the first grooves  112  are arranged in a horizontal direction, so as to increase the surface area of the front plate  110 . In addition, the front plate  110  is made of a high-adhesive material, such as graphite, metal coated with graphite, or other suitable material. In this way, when the ion beam impinges on the front plate  110 , the particles generated when the front plate  110  is bombarded will not peel easily. If the particles are peeled, the peeled particles can also be collected by the first grooves  112  extending along the horizontal direction, so as not to contaminate the traveling path of the ion beam or other components in the implanter. 
         [0044]    The back plate  120  is behind the front plate  110 , and a plurality of second grooves  122  is formed on one surface of the back plate  120  facing the front plate  110 , and the second grooves  122  are also arranged in a horizontal direction. The second grooves  122  are also designed to increase the surface area of the ion beam blocking component  100 , such that more particles attached thereon. Thus, the peeling can be avoided and the service life can be extended without the need of frequently replacing the ion beam blocking component  100 . Furthermore, the surface with the first grooves  112  of the front plate  110  may be fabricated into a rough surface to increase the surface area, such that more particles can be attached and the peeling phenomenon can be avoided. In a similar way, the surface with the second grooves  122  of the back plate  120  can also be fabricated into a rough surface to increase the surface area. 
         [0045]    In an embodiment of the present invention, the back plate  120  is made of a high hardness material, such as graphite, metal coated with graphite, or other suitable material, so as to resist the bombard of the ion beam. Furthermore, from  FIG. 1B , it can be known that the width w 2  of the second grooves  122  on the back plate  120  is the same as the width w 1  of the first grooves  112 , and the depth d 2  of the second grooves  122  is larger than the depth d 1  of the first grooves  112 . In practical operation, since the ion beam directly pass through the opening  110   a  of the front plate  110  to impinge on the back plate  120 , the second grooves  122  formed on the back plate  120  have a deeper depth d 2 , such that the particles peeled after the back plate  120  is bombarded may fall in the second grooves  122  or a receiving space S, so as not to drop out of the ion beam blocking component  100 . 
         [0046]    The side plates  130  are connected between the front plate  110  and the back plate  120 , so as to form the receiving space S between the front plate  110 , the back plate  120 , and the side plates  130 . In an embodiment of the present invention, the front plate  110  and the side plates  130  connected around the front plate  110  are integrally formed, and the front plate  110  and the side plates  130  can be fixed on the back plate  120  by means of adhering, locking, or others. 
         [0047]    When the ion implanter is in the calibration mode, the ion beam generated by the ion source of the ion implanter will pass through the opening  110   a  of the front plate  110  to impinge on the back plate  120 . In this way, the particles generated after the back plate  120  is bombarded by the ion beam will fall in the second grooves  122  or the receiving space S, so as not to contaminate the traveling path of the ion beam or a wafer under the ion implantation. 
         [0048]    Referring to  FIG. 2 , in another embodiment of the present invention, the second grooves  122  formed on the back plate  120  have a trapezoidal section, and the width of the bottom of each of the second grooves  122  is larger than the width of the opening, such that the particles cannot be dropped out easily. 
         [0049]      FIG. 3  is a schematic view of the appearance of the ion beam blocking device of the present invention. The ion beam blocking device  200  is also suitable for an ion implanter to be applied in a Faraday flag or serve as a common ion beam blocking plate. Referring to  FIG. 3 , the ion beam blocking device  200  includes a plurality of ion beam blocking components, such as the ion beam blocking components  100   a ,  100   b , and  100   c , as shown in the  FIG. 1A . The ion beam blocking components  100   a ,  100   b , and  100   c  are connected with each other to form a polyhedron structure which is rotated with an axle center  210  as a rotating shaft. 
         [0050]    In this way, when the ion beam blocking component  100   a  cannot be used any longer, another ion beam blocking component  100   b  can be rotated to block the bombard of the ion beam, thereby saving the time of replacing the ion beam blocking component  100 . In this embodiment, the three ion beam blocking components  100   a ,  100   b , and  100   c  are described as an example. However, more ion beam blocking components  100  shown in  FIG. 1  can be combined together. In the present invention, the number of the ion beam blocking components  100  in the ion beam blocking device  200  is not limited. 
         [0051]    Except the ion beam blocking device having the polyhedron structure as shown in  FIG. 3 , the present invention also provides a roulette-shaped ion beam blocking device  200 ′ shown in  FIG. 4 . Referring to  FIG. 4 , the ion beam blocking device  200 ′ comprises a plurality of ion beam blocking components  100   d ,  100   e ,  100   f ,  100   g ,  100   h ,  100   i ,  100   j ,  100   k  arranged in a roulette-shaped structure. These ion beam components  100   d ,  100   e ,  100   f ,  100   g ,  100   h ,  100   i ,  100   j ,  100   k  are connected to an axle center, and are rotated with an axle center  210 ′ as a rotating shaft. Preferably, when each ion beam component  100   d             100   e             100   f             100   g             100   h             100   i             100   j             100   k  is operated, the plurality of the first grooves  112  on of the front plate  110  is kept horizontal when facing the ion beam. Similarly, when the ion beam blocking component  100   d  cannot be used any longer, another ion beam blocking component  100   e  can be rotated to block the bombard of ion beam, thereby saving the time of replacing the ion beam blocking component  100 . The number of the ion beam blocking component  100  of the ion beam blocking device  200 ′ is not limited in the present invention. 
         [0052]    In view of the above, the ion beam blocking component provided by the present invention has a receiving space formed by the front plate, the back plate, and the plurality of side plate. When the ion implanter is in the calibration mode, the ion beam generated by the ion source of the ion implanter will pass through the opening of the front plate to impinge on the back plate. In this way, the particles generated after the back plate is bombarded by the ion beam will fall in the receiving space, so as not to contaminate the traveling path of the ion beam or a wafer under ion implantation, thereby improving the yield of products. Furthermore, a plurality of grooves arranged in a horizontal direction are formed on the surfaces of the front plate and the back plate, so as to increase the surface area of the ion beam blocking component and further avoid the peeling phenomenon. 
         [0053]    Furthermore, the present invention further provides an ion beam blocking device integrating a plurality of ion beam blocking components to form a polyhedron structure or a roulette-shape structure which can be rotated with an axle center as a rotating shaft. As such, when one of the ion beam blocking components cannot be used any longer, another ion beam blocking component can be rotated to block the bombard of the ion beam, so as to save time of replacing the ion beam blocking component. 
         [0054]    It will be apparent to those skilled in the art that various modifications and variations can be made to the structure of the present invention without departing from the scope or spirit of the invention. In view of the foregoing, it is intended that the present invention cover modifications and variations of this invention provided they fall within the scope of the following claims and their equivalents.