Patent Publication Number: US-2018050917-A1

Title: Polysilicon filament bonding device using polysilicon fragments

Description:
TECHNICAL FIELD 
     The present disclosure relates to a polysilicon filament bonding device, and more particularly, to a polysilicon filament bonding device for manufacturing a polysilicon filament with a desired length by bonding polysilicon fragments separated due to damage or the like. 
     BACKGROUND ART 
     When polysilicon is prepared using the Siemens method, a polysilicon filament is required. A currently used filament is manufactured using the Czochralski (CZ) process or a floating zone (FZ) method or a manufactured polysilicon rod is processed and used according to the filament standard. 
     In the case of the CZ method or FZ method of manufacturing a filament by melting polysilicon, in order to form a long filament, a reactor with a length equal to or greater than the filament is required and the possibility that a filament is damaged is high due to the characteristics of a filament shape during manufacture thereof. 
     In particular, when a filament is processed and used directly from a polysilicon rod, it is difficult to prepare a polysilicon rod with a length equal to or greater than a length of a filament. 
     In addition, the possibility that a slim and long filament breaks upon being installed in a reactor is very high and, in this case, there is a limit in that reuse of the breaking filament is not possible in reality. 
     As a cited reference, Korean Patent Application Publication No. 10-2013-0019568 (published on Feb. 27, 2013) discloses a “Method and apparatus for preparing polysilicon.” 
     DISCLOSURE 
     Technical Problem 
     It is an object of the present disclosure to provide a device for bonding polysilicon fragments to form a polysilicon filament. 
     It is another object of the present disclosure to provide a polysilicon filament bonding device for bonding polysilicon fragments without use of impurities. 
     Technical Solution 
     In accordance with one aspect of the present disclosure, a polysilicon filament bonding device includes a body portion formed like a cylinder, a guide portion disposed in the body portion and configured to guide polysilicon fragments brought into the body portion, and a main light source for heating a bonding surface of the polysilicon fragments. 
     The polysilicon filament bonding device may further include an auxiliary light source for preliminarily heating a polysilicon fragment accommodated in the body portion. 
     The auxiliary light source may be arranged so as not to interfere with the guide portion. 
     When the body portion includes a reflective surface disposed on an internal surface thereof, a heating effect using an auxiliary light source may be further enhanced. 
     The polysilicon filament bonding device may further include a light concentrator for concentrating light emitted from the main light source to a bonding surface. 
     The body portion may include a sight glass for observing a bonding surface of the polysilicon filament and may further include a fixer for fixing the polysilicon fragment. 
     The guide portion may be formed of a polysilicon material. 
     The guide portion may include a frame and a plurality of rollers rotatably connected to the frame and portions of the guide portion may be arranged in the form of a square so as to uniformly support an outer circumferential surface of the polysilicon filament. 
     The guide portion may be detachably formed on the body portion and may be replaceable according to a diameter of the polysilicon fragment. 
     The polysilicon filament bonding device may further include a guide bar formed to be inserted into the body portion to a predetermined depth and having an end positioned at a heated region of the main heat source upon being inserted into the body portion. 
     Advantageous Effects 
     The present disclosure provides a device for forming a polysilicon filament by bonding a polysilicon fragment without impurities so as to reduce manufacturing costs of the polysilicon fragment. 
    
    
     
       DESCRIPTION OF DRAWINGS 
         FIG. 1  is a diagram illustrating a concept of a polysilicon filament bonding device using a polysilicon fragment according to an exemplary embodiment of the present disclosure. 
         FIG. 2  is a perspective view of a polysilicon filament bonding device using a polysilicon fragment according to an exemplary embodiment of the present disclosure. 
         FIG. 3  is a cross-sectional view of a polysilicon filament bonding device using a polysilicon fragment according to an exemplary embodiment of the present disclosure. 
         FIG. 4  is a cross-sectional view of a polysilicon filament bonding device using a polysilicon fragment according to another exemplary embodiment of the present disclosure. 
         FIG. 5  is a plan view of a polysilicon filament bonding device using a polysilicon fragment according to another exemplary embodiment of the present disclosure. 
         FIG. 6  is a cross-sectional view of a guide bar of a polysilicon filament bonding device using a polysilicon fragment according to an exemplary embodiment of the present disclosure. 
     
    
    
     EXPLANATION OF REFERENCE NUMERALS DESIGNATING THE MAJOR ELEMENTS OF THE DRAWINGS 
     
         
         
           
               100 : polysilicon filament bonding device 
               110 : body portion 
               120 : guide portion 
               130 : main light source 
               140 : auxiliary light source 
               150 : fixer 
               160 : guide bar 
           
         
       
    
     BEST MODE 
     Terms or words used herein shall not be limited to having common or dictionary meanings, and have the meanings corresponding to technical aspects of the embodiments of the present disclosure so as to most suitably express the embodiments of the present disclosure. In addition, embodiments described in the specification and configurations illustrated in the drawings are merely an exemplary embodiment of the present disclosure and are not limited thereto and, thus, it will be understood by those of ordinary skill in the art that various changes and equivalents in form and details may be made therein at the filing time of the application. 
       FIG. 1  is a diagram illustrating a concept of a polysilicon filament bonding device using a polysilicon fragment according to an exemplary embodiment of the present disclosure. 
     The polysilicon filament bonding device according to the present disclosure may be a device for bonding polysilicon fragments  10  and  20  to form a polysilicon filament with a desired length. 
     The polysilicon filament bonding device according to the present disclosure may melt and bond the two fragments  10  and  20  in the polysilicon filament bonding device  100  without impurities such as separate adhesives. 
     As illustrated in the drawing, the polysilicon filament bonding device  100  according to the present disclosure may include a cylindrical body portion  110 , a guide portion  120  for guiding a polysilicon fragment that is formed and moved into the body portion, and light sources  130  and  140  for heating and welding the polysilicon fragment moved into the body portion. 
     The light sources may include a main light source  130  for heating a bonding surface to a polysilicon melting temperature or more and an auxiliary light source  140  for heating polysilicon around the bonding surface to the polysilicon melting temperature or less. 
     The guide portion  120  may be formed of a polysilicon material in order to prevent the bonded polysilicon filaments from being contaminated. 
       FIG. 2  is a perspective view of a polysilicon filament bonding device using a polysilicon fragment according to an exemplary embodiment of the present disclosure.  FIG. 3  is a cross-sectional view of a polysilicon filament bonding device using a polysilicon fragment according to an exemplary embodiment of the present disclosure. 
     As illustrated in the drawings, the polysilicon filament bonding device  100  according to the present disclosure may include the cylindrical body portion  110 , the guide portion  120  for guiding a polysilicon fragment that is formed and moved into the body portion, and the main light source  130  for heating a bonding surface of the polysilicon fragment moved into the body portion. 
     Although the drawings illustrate the case in which the polysilicon filament bonding device  100  is vertically positioned for convenience of illustration, the polysilicon filament bonding device  100  may be horizontally positioned and used as illustrated in  FIG. 1 . 
     A melting temperature of polysilicon is about 1414° C. and, in this regard, when a halogen lamp is used as a light source and a light concentrator  132  such as a concave mirror or a convex lens is used, a portion to which light is radiated may be directly heated by the light source at a temperature equal to or greater than 1414° C. 
     Two polysilicon fragments may be bonded to each other by processing bonding surfaces of the polysilicon fragments to be bonded so as to have corresponding shapes, inserting one of the polysilicon fragments so as to position a bonding surface at a heating portion of the main light source  130 , fixing the inserted polysilicon fragment using a fixer  150 , melting the bonding surface by a main light source and, then, inserting the polysilicon fragments to be bonded. 
     As illustrated in the drawing, the fixer  150  may be formed in the form of a clamp and may be detachably formed so as to correspond to a diameter of the polysilicon fragment. Alternatively, a separate adaptor may be detachably formed at a clamp and may be replaced according to a diameter or cross section of polysilicon to be fixed. 
     A polysilicon fragment used to manufacture a polysilicon filament has a circular or square cross section and, thus, it is important to bond polysilicon fragments in a straight line. The guide portion  120  may arrange the polysilicon fragments in a straight line. 
     To this end, portions of the guide portion  120  may be arranged in the form of a square. 
     The guide portion  120  may include a frame  122  and a plurality of rollers  124  and the frame  122  may be detachably fixed to a holder portion  112  formed in the body portion  110 . 
     The frame  122  may be fixed to the holder portion  112  via sliding fitting or tight fitting. 
     This may be performed in order to replace the guide portion  120  so as to correspond to a diameter of a polysilicon fragment to be bonded. 
     The body portion  110  may include a sight glass  114  for observing a heated region of the main light source  130  therethrough. Through the sight glass  114 , the bonding surface may be checked to be appropriately positioned in the heated region of the main light source  130  and a melting state of the bonding surface may be checked. 
       FIG. 4  is a cross-sectional view of a polysilicon filament bonding device using a polysilicon fragment according to another exemplary embodiment of the present disclosure.  FIG. 5  is a plan view of a polysilicon filament bonding device using a polysilicon fragment according to another exemplary embodiment of the present disclosure. 
     According to the exemplary embodiment of  FIGS. 4 and 5 , the polysilicon filament bonding device may further include the auxiliary light source  140  for heating a polysilicon fragment accommodated in the body portion  110 . 
     When only a bonding surface is heated to high temperature using the main light source  130 , a polysilicon fragment may be damaged by thermal shock due to a local temperature difference and, thus, the polysilicon filament bonding device may further include the auxiliary light source  140  in order to heat the polysilicon fragment accommodated in the body portion  110  to an appropriate temperature. 
     As illustrated in  FIG. 4 , the auxiliary light source  140  may be disposed between the portions of the guide portion  120  and a heating temperature at which the auxiliary light source  140  is used may be in the range of 800 to 900° C. When a temperate of the auxiliary light source  140  is lower than the temperature range, the possibility that the polysilicon fragment is damaged by thermal shock due to a still high temperature difference from a bonding surface by a main light source may be increased and, when the temperature of the auxiliary light source  140  is higher than the temperature range, unnecessary energy costs may be increased. 
     A halogen lamp may be used as the auxiliary light source  140  like the main light source  130  and, in order to enhance a heating effect using an auxiliary light source, a reflective surface (not shown) may be disposed on an internal surface of the body portion  110 . The reflective surface may reflect light emitted from the auxiliary light source  140  so as to enhance a heating effect. 
       FIG. 6  is a cross-sectional view of a guide bar of a polysilicon filament bonding device using a polysilicon fragment according to an exemplary embodiment of the present disclosure. 
     The polysilicon filament bonding device according to the present disclosure may further include a guide bar  160 . The guide bar  160  may be used to normally position a bonding surface of a polysilicon filament. 
     The guide bar  160  may include a head portion  162  and an insert rod  164 . The head portion  162  may have a diameter with which the head portion  162  is not capable of being inserted into the body portion  110  and the insert rod  164  may have a diameter with which the insert rod  164  is capable of being inserted into the body portion  110 . The insert rod  164  may have a length such that a lower end there is positioned at a central portion of a heated region of a main light source upon being completely inserted into the body portion  110 . 
     As illustrated in the drawing, the guide bar  160  may be inserted into the body portion  110  and a polysilicon fragment may be inserted through a lower portion of the body portion  110  such that the guide bar  160  comes into contact with the insert rod of the bonding surface of the polysilicon fragment and, then, the polysilicon fragment may be fixed by the fixer  150  and the bonding surface may be fixedly positioned at the central portion of the heated region of the main light source  130 . 
     Then, the bonding surface may be heated by the main light source  130  and the polysilicon fragment to be bonded may be inserted through an upper portion of the body portion so as to bond polysilicon fragments. 
     As described above, the polysilicon filament bonding device according to the present disclosure may melt and bond a plurality of polysilicon fragments without use of separate adhesives so as to manufacture a polysilicon filament with a desired length. 
     Accordingly, when the polysilicon filament bonding device according to the present disclosure is used, damaged polysilicon filament fragments may be reused and polysilicon filament fragments with a short length may be manufactured and bonded, thereby reducing manufacturing costs of the polysilicon filament. 
     The present disclosure described above may be variously substituted, altered, and modified by those skilled in the art to which the present invention pertains without departing from the scope and sprit of the present disclosure. Therefore, the present disclosure is not limited to the above-mentioned exemplary embodiments and the accompanying drawings.