Patent Abstract:
A template for polishing Silicon Carbide, Sapphire, Germanium, Silicon and pattern wafers having a slurry inlet, channels, outlets and pockets for holding said wafers terminating in peripheral vacuum ports in order to facilitate an efficient flow of slurry over the semiconductor wafers during a polishing process.

Full Description:
BACKGROUND OF THE INVENTION 
     Field of the Invention 
     The present invention relates generally to semiconductor wafers and, more specifically, to a device for holding a plurality of semiconductor wafers taken from the group of Silicon Carbide, Sapphire, Germanium, Silicon and pattern wafers for polishing while having a fluid conducted over said wafers by means of a central inlet having a plurality of channels extending therefrom to each wafer pocket, where the slurry moves via centripetal force to a vacuum outlet for evacuation. 
     While other wafer polishing devices may be suitable for the purposes for which they were designed, they would not be as suitable for the purposes of the present invention, as hereinafter described. 
     SUMMARY OF THE PRESENT INVENTION 
     Current industry polishing process provides slurry that flows from a tube in the center of the polishing head into the center of the polishing pad. From there, the slurry is spread throughout the polishing pad and templates with the wafers polished by the flowing slurry. Most of the slurry is swept off the polishing pad due to centripetal force of the spinning head. As an example, the current process of polishing wafers provides for a sample flow rate of 1000 millimeters onto the polishing table where 30% of the slurry acts upon a wafer while 70% goes to the drains. 
     The present invention provides an environmentally green process template wafer holder for the semiconductor wafers polishing industry by creating a template having a center hole for initial slurry flow into the CIG (Chemical Inducing Grooves) channels with additional holes created around the template surface for more slurry channels into CIG. Escape holes are created approximate the periphery for slurry or water to escape the template to prevent overflow of slurry or water. The slurry and/or water are extracted out of these holes by a vacuum that can be controlled to prevent contamination. Slurry channels into the wafer pockets of the template by the CIG and escapes by centripetal force through the CIG channels at a controlled speed whereby controlling the flow of slurry within the channels of the template produces better wafer contact and flatness with less slurry waste and less processing time saving power and therefore saving time and money. 
     A primary object of the present invention is to provide a template for polishing Silicon Carbide, Sapphire, Germanium, Silicon and pattern wafer. 
     Another object of the present invention is to provide a template for polishing Silicon Carbide, Sapphire, Germanium, Silicon and pattern wafers utilizing the centripetal forces of the spinning template to induct flow of a fluid over the held wafers. 
     Yet another object of the present invention is to provide a template for holding Silicon Carbide, Sapphire, Germanium, Silicon and pattern wafers having a central inlet with a plurality of channels for inducting fluid over said wafers. 
     Still yet another object of the present invention is to provide a template for polishing Silicon Carbide, Sapphire, Germanium, Silicon and pattern wafers having an inlet to introduce a fluid, channels to guide it, and outlets to relieve said fluid and a vacuum to evacuate it. 
     Another object of the present invention is to provide a template for polishing Silicon Carbide, Sapphire, Germanium, Silicon and pattern wafers having a plurality of channels designed specifically to produce maximum flow and efficiency. 
     Additional objects of the present invention will appear as the description proceeds. 
     The present invention overcomes the shortcomings of the prior art by providing a template for polishing Silicon Carbide, Sapphire, Germanium, Silicon and pattern wafers having a slurry inlet, channels, outlets and pockets for holding said wafers terminating in peripheral vacuum ports in order to facilitate an efficient flow of slurry over the semiconductor wafers during a polishing process. 
     The foregoing and other objects and advantages will appear from the description to follow. In the description reference is made to the accompanying drawing, which forms a part hereof, and in which is shown by way of illustration specific embodiments in which the invention may be practiced. These embodiments will be described in sufficient detail to enable those skilled in the art to practice the invention, and it is to be understood that other embodiments may be utilized and that structural changes may be made without departing from the scope of the invention. In the accompanying drawing, like reference characters designate the same or similar parts throughout the several views. 
     The following detailed description is, therefore, not to be taken in a limiting sense, and the scope of the present invention is best defined by the appended claims. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWING FIGURES 
       In order that the invention may be more fully understood, it will now be described, by way of example, with reference to the accompanying drawing in which: 
         FIG. 1  is an illustrative view of the present invention in use. 
         FIG. 2  is an illustrative view of the present invention. 
         FIG. 3  is an illustrative view of the present invention. 
         FIG. 4  is an illustrative view of the present invention. 
         FIG. 5  is a sectional perspective view of the present invention. 
         FIG. 6  is a top view of the present invention. 
         FIG. 7  is a top view of the present invention. 
         FIG. 8  is a top view of the present invention. 
         FIG. 9  is a top view of the present invention. 
     
    
    
     DESCRIPTION OF THE REFERENCED NUMERALS 
     Turning now descriptively to the drawings, in which similar reference characters denote similar elements throughout the several views, the figures illustrate the Silicon Carbide, Sapphire, Germanium, Silicon and pattern wafer polishing template of the present invention. With regard to the reference numerals used, the following numbering is used throughout the various drawing figures.
           10  Silicon Carbide, Sapphire, Germanium, Silicon and pattern wafer polishing template of the present invention     12  slurry inlet     14  channel     16  semiconductor wafer     18  wafer pocket     20  template surface     22  slurry port     24  vacuum port     26  housing     28  directional guide     30  slurry passage     32  fluid course     34  slurry       

     DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT 
     The following discussion describes in detail one embodiment of the invention (and several variations of that embodiment). This discussion should not be construed, however, as limiting the invention to those particular embodiments, practitioners skilled in the art will recognize numerous other embodiments as well. For definition of the complete scope of the invention, the reader is directed to appended claims. 
       FIG. 1  is an illustrative view of the present invention in use. The present invention is a template for polishing Silicon Carbide, Sapphire, Germanium, Silicon and pattern wafers  10  for manufacture in the electronics industry. Stemming from the templates center is a slurry input  12  that introduce s water, fluid or slurry (hereinafter referred to as slurry) to a plurality of channels  14  formed on the top template surface  20  and directional guides  28  to deliver said slurry through a plurality of slurry passages  30  notched into the walls of said wafer pockets  18  and evenly distribute and disperse said slurry upon wafers  16  disposed therein. There are apertures disposed within the channels  14  forming slurry outlets  22  to prevent slurry overflow. Additionally shown is the template loaded with four wafers  16  with a fifth being inserted into its designated placement. The slurry moves via centripetal force to vacuum ports  24  for evacuation. 
       FIG. 2  is an illustrative view of the present invention. The present invention is a template for polishing Silicon Carbide, Sapphire, Germanium, Silicon and pattern wafers  10  for manufacture in the electronics industry. The slurry enters the template through a centrally disposed inlet  12  into channels  14  with slurry outlets  22  to prevent overflow and the slurry enters the wafer pockets  18  to evenly distribute and disperse a polishing fluid upon its held wafers. The remaining slurry is then evacuated via centripetal force through vacuum ports  24 . 
       FIG. 3  is an illustrative view of the present invention. Shown is the template for polishing Silicon Carbide, Sapphire, Germanium, Silicon and pattern wafers  10  having a housing  26  an inlet  12  in its center for receiving fluid therethrough with a plurality of outlets  22  that will allow excess fluid to centripetally drain through, along with a plurality of vacuum ports  24  for draining any remaining fluid out its periphery. 
       FIG. 4  is an illustrative view of the present invention. The present invention is a template for polishing Silicon Carbide, Sapphire, Germanium, Silicon and pattern wafers  10  for manufacture in the electronics industry. Stemming from the slurry inlet  12  templates center and out to it&#39;s periphery are a plurality of channels  14  to direct the slurry to the overflow slurry outlets  22  and wafer pockets  18  and eventually to the vacuum ports  24 . 
       FIG. 5  is a sectional perspective view of the template for polishing Silicon Carbide, Sapphire, Germanium, Silicon and pattern wafers  10  of the present invention. Shown is the fluid course  32  being used with the present invention, fluid is taken into the slurry inlet  12 , can bleed out of the outlets  22  due to centripetal force and is then removed via a vacuum port  24 . 
       FIG. 6  is a top view of the present invention. The present invention is a template for polishing Silicon Carbide, Sapphire, Germanium, Silicon and pattern wafers  10 . Shown is the relationship between the slurry inlet  12 , channels  14 , slurry outlets  22 , wafer pockets  18  ant vacuum ports  24 . 
       FIG. 7  is a top view of the template for polishing Silicon Carbide, Sapphire, Germanium, Silicon and pattern wafers  10  of the present invention. Shown is the coarse the slurry  34  takes while being used with the present invention, slurry  34  is taken in by the inlet  12 , can bleed out of the outlets  22  due to centripetal force and is then removed via vacuum ports  24 . 
       FIG. 8  is a top view of the template for polishing Silicon Carbide, Sapphire, Germanium, Silicon and pattern wafers  10  of the present invention. Shown is the course of the slurry  34  takes while being used with the present invention. Slurry  34  is taken in by the inlet  12 , can bleed out of the outlets  22  due to centripetal force, enters the wafer pockets  18  to coat and polish the wafers  16  therein and is then removed via the vacuum ports  24 . 
       FIG. 9  is a top view of the template for polishing Silicon Carbide, Sapphire, Germanium, Silicon and pattern wafers  10  of the present invention. Shown is the course the slurry  34  takes while being used with the present invention, Slurry  34  is taken in by the inlet  12 , can bleed out of the outlets  22  due to centripetal force, enters the wafer pockets  18  to coat and polish the wafers  16  therein and is then removed via the vacuum ports  24 . 
     It will be understood that each of the elements described above, or two or more together may also find a useful application in other types of methods differing from the type described above. 
     While certain novel features of this invention have been shown and described and are pointed out in the annexed claims, it is not intended to be limited to the details above, since it will be understood that various omissions, modifications, substitutions and changes in the forms and details of the device illustrated and in its operation can be made by those skilled in the art without departing in any way from the spirit of the present invention. 
     Without further analysis, the foregoing will so fully reveal the gist of the present invention that others can, by applying current knowledge, readily adapt it for various applications without omitting features that, from the standpoint of prior art, fairly constitute essential characteristics of the generic or specific aspects of this invention.

Technology Classification (CPC): 1