Abstract:
A substrate supporting apparatus includes first and second shafts spaced by a distance that corresponds to or exceeds a width of a substrate, and at least one wire to support the substrate. The wire has ends coupled to respective ones of the first and second shafts. The wire is raised and lowered to place a substrate onto a lower electrode in a substrate processing chamber and to remove the substrate when processing is completed.

Description:
BACKGROUND 
       [0001]    1. Field 
         [0002]    One or more embodiments described herein relate to processing substrates including semiconductor substrates. 
         [0003]    2. Background 
         [0004]    Semiconductor devices and flat panel displays are made by performing photographing, etching, diffusion, deposition, and other processes on a substrate. These processes are performed in an apparatus having moving parts that can damage or otherwise adversely affect the performance of the finished substrate. 
     
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         [0005]      FIGS. 1   a  to  1   c  are diagrams showing one type of substrate supporting apparatus. 
           [0006]      FIGS. 2 to 4  are diagrams showing an embodiment of another type of substrate supporting apparatus. 
           [0007]      FIG. 5  is a diagram showing an embodiment of another type of substrate supporting apparatus. 
           [0008]      FIGS. 6   a  to  6   c  are diagrams showing operation of one or more of the foregoing embodiments of the substrate supporting apparatus. 
       
    
    
     DETAILED DESCRIPTION 
       [0009]      FIG. 1   a  shows one type of substrate processing apparatus that includes upper and lower electrodes  110  and  120  in a chamber  100 . In operation, a substrate is transferred (e.g., by a robot) into the chamber through a gate valve G and placed on the lower electrode. A supporting apparatus  130  is used to place the substrate on the lower electrode, and/or to withdraw the substrate from the chamber once processing is finished. 
         [0010]    The substrate supporting apparatus includes a plurality of lift pins  131  that pass through the lower electrode, a pin plate  132  provided with the lift pins, and a lift unit  133  for lifting the pin plate up and down. 
         [0011]    When gate valve G is opened in a state shown in  FIG. 1   a , a robot arm carrying the substrate is advanced into the chamber through the gate valve. As shown in  FIG. 1   b , when the robot arm advances into the chamber, pin plate  132  is immediately lifted causing lift pins  131  to pass through lower electrode. When the lift pins project out of the lower electrode, substrate S carried is transferred onto the lift pins from the robot. When the pin plate is lowered, the lift pins pass back through the lower electrode to thereby place the substrate on the lower electrode as shown in  FIG. 1   c.    
         [0012]    When the lift pins contact the substrate during lifting and lowering, foreign materials attached to uppermost parts of the pins may cause spots to form on the substrate. Also, the positions of the lift pins are fixed and cannot be changed because, in any other position, the pins would not be able to pass through the respective holes in the lower electrode. Also, lift pins may damage patterns formed on the substrate, and further damage may result when processes are performed without first detecting that one or more of the lift pins are broken. 
         [0013]      FIGS. 2 and 3  show an embodiment of another type of substrate supporting apparatus  30 . This apparatus includes first and second supporters  31   a  and  31   b  provided in parallel at respective sides of lower electrode  20 . The lower electrode is interposed between the first and second supporters and first and second combining holes  31   ah  and  31   bh  are formed on the first and second supporters respectively. 
         [0014]    First shafts  32   a  are inserted into three of the combining holes  31   ah , and second shafts  32   b  are inserted into three of the combining holes  31   bh . This insertion may be performed, for example, by screwing the shafts into the holes. Wires  33  are connected to respective pairs of the shafts  32   a  and  32   b  that face each other. In  FIG. 3 , three wires are shown as being used. However, a different number of wires (e.g., 1 or more) may be used in other embodiments. Also, the gap or spacing between the wires may be determined, for example, based on the positions of the combining holes. 
         [0015]    The position of the wires can be set or changed based on (e.g., to correspond to or avoid) patterns formed on the substrate. By setting or changing the position of the wires, it is possible, for example, to prevent the wires from contacting and therefore damaging portions of the substrate that contain patterns. 
         [0016]    The substrate supporting apparatus also includes lift units  33   a  and  33   b  which are respectively connected to lower ends of first and second supporters  31   a  and  31   b . The lift units operate to lift the first and second supporters  31   a  and  31   b  up and down as necessary before, during, and/or after processing. 
         [0017]    The substrate supporting apparatus may also include a sensor  34  to detect the presence of a break in one or more of the wires. The sensor may detect a break (or short) by applying a signal (e.g., a current, voltage, or power signal) to one end of the wire and then detecting the presence or absence of the signal at an opposing end of the wire. Other types of sensors may be used for this purpose. An unexplained reference numeral ‘50’ indicates a substrate transfer robot. 
         [0018]    Referring to  FIG. 4 , one or more grooves  22  are formed on an upper surface of the lower electrode  20  to receive respective ones of the wires  33 , when frames  31   a  and  31   b  are lifted down. In other embodiments, these grooves may not be formed. 
         [0019]      FIG. 5  shows an embodiment of another type of substrate supporting apparatus. In this embodiment, supporters  31   a  and  31   b  are connected to each other. That is, the supporters in  FIG. 3  correspond to a pair of bars but the supporters in  FIG. 5  are connected to form a frame  41 . This frame may be a rectangular ring-type frame that surrounds the lower electrode. The construction and operation of shaft  42  and wires  43  may be similar to those in  FIG. 3 . 
         [0020]    Operation of the substrate supporting apparatus will now be explained with reference to  FIGS. 6   a  to  6   c . First, as shown in  FIG. 6   a  when a gate valve G is opened and a robot arm carrying a substrate S is advanced through the valve, the first and second supporters  31   a  and  31   b  are lifted up by the lift units. As a result, the substrate is removed from the robot arm to rest on the wires  33  as shown in  FIG. 6   b.    
         [0021]    Next, the robot arm is withdrawn through the gate valve and the first and second supporters are lowered. When the supporters are lowered, the wires are received in respective grooves formed in lower electrode  20  and substrate S is placed on the lower electrode as shown in  FIG. 6   c.    
         [0022]    Thus, one or more embodiments described herein provide a substrate supporting apparatus than can prevent spots from forming on contact portions of a substrate by using one or more wires to lift the substrate instead of lift pins. 
         [0023]    According to one embodiment, a substrate supporting apparatus includes a pair of frames provided at both sides of a lower electrode, where the lower electrode is interposed between the frames; a plurality of shafts projected from upper surfaces of the frames; a wire whose both ends are connected to the shafts provided at both sides of the lower electrode; and a lift unit lifting up/down the frames. 
         [0024]    A groove may be formed in an upper surface of the lower electrode to receive the wire when the frame is lifted down. The shaft may be formed integrally with the frame. Or, the shaft may be formed separately from the frame so as to be movably combined to the frame. The wire may be formed of conductor. Or, the wire may be formed of non-conductor and coated with conductor such as aluminum. 
         [0025]    In addition, the substrate supporting apparatus may further include a sensor sensing a short of the wire to interrupt process when the wire is shorted. Both facing ends of the pair of frames may be connected with each other in a rectangular shape. 
         [0026]    The foregoing embodiments of the substrate supporting apparatus can achieve one or more of following effects. First, the substrate is lifted using one or more wires. This prevents formation of spots on the substrate including areas that include patterns. Second, the positions of the wires can be set or changed (e.g., by moving shafts to different holes) to positions that avoid patterns on the substrate to thereby ensure that these portions of the substrate are not damaged. Third, the manufacturing process can be interrupted by quickly sensing a break (or short) in any one of the wires. 
         [0027]    Any reference in this specification to “one embodiment,” “an embodiment,” “example embodiment,” etc., means that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one embodiment of the invention. The appearances of such phrases in various places in the specification are not necessarily all referring to the same embodiment. Further, when a particular feature, structure, or characteristic is described in connection with any embodiment, it is submitted that it is within the purview of one skilled in the art to effect such feature, structure, or characteristic in connection with other ones of the embodiments. 
         [0028]    Although embodiments of the present invention have been described with reference to a number of illustrative embodiments thereof, it should be understood that numerous other modifications and embodiments can be devised by those skilled in the art that will fall within the spirit and scope of the principles of this invention. More particularly, reasonable variations and modifications are possible in the component parts and/or arrangements of the subject combination arrangement within the scope of the foregoing disclosure, the drawings and the appended claims without departing from the spirit of the invention. In addition to variations and modifications in the component parts and/or arrangements, alternative uses will also be apparent to those skilled in the art.