Patent Publication Number: US-2023141638-A1

Title: Coater cup deformation testing device and method of coater cup deformation testing

Description:
BACKGROUND 
     Field of Invention 
     The present disclosure relates to a coater cup deformation testing device and a method of coater cup deformation testing. 
     Description of Related Art 
     In a semiconductor manufacturing process, a coater cup device is used for a photoresist coating process of a semiconductor wafer. When the semiconductor wafer is coated, the coater cup device accumulating the semiconductor wafer can avoid splashing of the liquid photoresist on the semiconductor wafer and stabling flow, thereby enabling uniform photoresist coating on the semiconductor wafer. However, it is possible that deformations appear on the coater cup device because of contact of the matters (e.g. wafers or liquid photoresist) and cleaning. The deformed cup device will damage the semiconductor wafer accumulated within. 
     Therefore, how to provide a solution for determine whether the coater cup device is deformed is one of the subjects to be solved for the industry. 
     SUMMARY 
     One aspect of the present disclosure is relative to a coater cup deformation testing device. 
     According to one embodiment of the present disclosure, a coater cup deformation testing device includes a supporting board, a first plate and a second plate. The first plate is located on a first side surface of the supporting board. The first plate is circular and has a first diameter. The second plate is located on the first plate or on a second side surface of the supporting board. The second side surface is opposite to the first side surface. The second plate is circular and has a second diameter less than the first diameter. An area of each of the first and second plates is less than an area of the supporting board. A projection of each of the first and second plates on the supporting board is formed within the supporting board. 
     In one or more embodiments of the present disclosure, the supporting board, the first plate and the second plate are concentric circles. 
     In some embodiments, the supporting board further includes a ruler. The ruler is formed on the supporting board. Scales of the ruler are arranged along a direction from a center of the supporting board to a periphery of the supporting board. 
     In some embodiments, the scales of the ruler are disposed on the supporting board and arranged at a periphery of the first plate or the second plate. 
     In some embodiments, the supporting board is transparent. The scales of the ruler are disposed on at least one of the first side surface and the second side surface. 
     In one or more embodiments of the present disclosure, the first plate and the second plate are transparent. 
     In one or more embodiments of the present disclosure, the coater cup deformation testing device further includes a third plate. The third plate is located on one of the first and second plates. The third plate is circular and has a diameter less than each of the diameters of the first and second plates. 
     An aspect of the present disclosure is related to a method of coater cup deformation testing. 
     According to one embodiment of the present disclosure, a method of coater cup deformation testing includes following operations. Provide a coater cup deformation testing device. The coater cup deformation testing device includes a supporting board, a first plate and a second plate. The first plate and the second plate are circular. The first plate is located on a first side surface of the supporting board. The second plate is located on the first plate or on a second side surface of the supporting board. The second side surface is opposite to the first side surface. A diameter of the second plate is less than a diameter of the first plate. Disassemble a coater cup device. The coater cup device includes a bottom cup, an upper cup and an inner cup. The inner cup is rotatably located on the bottom cup to support a semiconductor wafer. The upper cup and the bottom cup form a space accumulating the semiconductor wafer supported by the inner cup within the space. Receive the bottom cup by the first plate of the coater cup deformation testing device. Receive the upper cup by the second plate of the coater cup deformation testing device. 
     In one or more embodiments of the present disclosure, the method of coater cup deformation testing further includes following operations. Rotate the bottom cup after the bottom cup is received by the first plate of the coater cup deformation testing device. Rotate the upper cup after the upper cup is received by the second plate of the coater cup deformation testing device. 
     In one or more embodiments of the present disclosure, the bottom cup includes a first edge. The upper cup includes a second edge. The first edge is connected to the second edge to form the space accumulating the semiconductor wafer. The first edge of the bottom cup is received by the first plate of the coater cup deformation testing device. The second edge of the upper cup is received by the second plate of the coater cup deformation testing device. 
     In one or more embodiments of the present disclosure, the coater cup device further includes a middle cup disposed between the bottom cup and the upper cup. The middle cup extends within the space formed by the upper cup and the bottom cup to a periphery of the semiconductor wafer. The coater cup deformation testing device further includes a third plate disposed on one of the first plate and the second plate. The method of coater cup deformation testing further includes following operations. Receive the middle cup by the third plate. 
     In one or more embodiments of the present disclosure, the supporting board, the first plate and the second plate are concentric circles. The supporting board of the coater cup deformation testing device further includes a ruler. Scales of the ruler are arranged along a direction from a center of the supporting board to a periphery of the supporting board. The method of coater cup deformation testing further includes following operations. Align the bottom cup with the scales to define a size differential of the bottom cup if the bottom cup extends beyond the first plate when the bottom cup is received by the first plate. Align the upper cup with the scales to define a size differential of the upper cup if the upper cup extends beyond the second plate when the upper cup is received by the second plate. 
     In some embodiments, the supporting board is transparent. The scales of the ruler on the supporting board are configured on at least one of the first side surface and the second side surface. 
     In some embodiments, the first plate and the second plate are transparent. 
     In some embodiments, the ruler is configured on the supporting board and arrange at a periphery of the first plate or the second plate. 
     In summary, a coater cup deformation testing device of the present disclosure can include a supporting board and plates for testing. The plates on the supporting board can have similar shapes with cups of a coater cup device, so that the cups of the coater cup device can be received by the plates of the coater cup deformation testing device if the cups are not deformed. Therefore, it can be determined that whether the coater cup device is deformed based on the receiving situations of the cups and plates. 
     It is to be understood that both the foregoing general description and the following detailed description are by examples, and are intended to provide further explanation of the disclosure as claimed. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
       The advantages of the present disclosure are to be understood by the following exemplary embodiments and with reference to the attached drawings. The illustrations of the drawings are merely exemplary embodiments and are not to be considered as limiting the scope of the disclosure. 
         FIG.  1 A  illustrates a cross-section view of a coater cup deformation testing device according to one embodiment of the present disclosure; 
         FIG.  1 B  illustrates a top view of the coater cup deformation testing device of  FIG.  1 A ; 
         FIG.  1 C  illustrates a bottom view of the coater cup deformation testing device of  FIG.  1 A ; 
         FIG.  2 A  illustrates a exploded view of a coater cup device according to one embodiment of the present disclosure; 
         FIG.  2 B  illustrates a cross-section view of the coater cup device of  FIG.  2 A , wherein the coater cup device accumulates a semiconductor wafer; 
         FIG.  3    illustrates a cross-section view of cups forming the coater cup device of  FIG.  2 A ; 
         FIG.  4   ~6 illustrate cross-section views of plates of the coater cup deformation testing device receiving the cups of the coater cup device according to one embodiment of the present disclosure; 
         FIG.  7    illustrates a re-determination operation of the coater cup device by using a test wafer according to one embodiment of the present disclosure; 
         FIG.  8 A  illustrates a top view of a coater cup deformation testing device according one embodiment of the present disclosure; and 
         FIG.  8 B  illustrates a local view of a ruler on the supporting board of the coater cup deformation testing device of  FIG.  8 A . 
     
    
    
     DETAILED DESCRIPTION 
     Reference will now be made in detail to the embodiments of the present disclosure, examples of which are illustrated in the accompanying drawings. Wherever possible, the same reference numbers are used in the drawings and the description to refer to the same or like parts. 
     In addition, terms used in the specification and the claims generally have the usual meaning as each terms are used in the field, in the context of the disclosure and in the context of the particular content unless particularly specified. Some terms used to describe the disclosure are to be discussed below or elsewhere in the specification to provide additional guidance related to the description of the disclosure to specialists in the art. 
     Phrases “first,” “second,” etc., are solely used to separate the descriptions of elements or operations with same technical terms, not intended to be the meaning of order or to limit the disclosure. 
     Secondly, phrases “comprising,” “includes,” “provided,” and the like, used in the context are all open-ended terms, i.e. including but not limited to. 
     Further, in the context, “a” and “the” can be generally referred to one or more unless the context particularly requires. It will be further understood that phrases “comprising,” “includes,” “provided,” and the like, used in the context indicate the characterization, region, integer, step, operation, element and/or component it stated, but not exclude descriptions it stated or additional one or more other characterizations, regions, integers, steps, operations, elements, components and/or groups thereof. 
     In order to determine deformations of a coater cup device used to accumulate a wafer, a coater cup deformation testing device and a corresponding method of coater cup deformation testing are provided, and damages caused by the deformations of the coater cup device for the wafer can be avoided. 
     Reference is made by  FIG.  1 A .  FIG.  1 A  illustrates a cross-section view of a coater cup deformation testing device  100  according to one embodiment of the present disclosure. 
     As shown in  FIG.  1 A , in this embodiment, a coater cup deformation testing device  100  includes a supporting board  110 , a plate  120 , a plate  130  and a plate  140 . The supporting board  110  includes a first side surface  111  and an opposite second side surface  112 . The plate  120  is located on the first side surface  111  of the supporting board  110 . The plate  130  is located on the second side surface  112 . The plate  140  is located on the plate  130 , and the plate  130  is located between the supporting board  110  and the plate  140 . 
     Reference is also made by  FIGS.  1 B and  1 C .  FIG.  1 B  illustrates a top view of the coater cup deformation testing device  100  of  FIG.  1 A .  FIG.  1 C  illustrates a bottom view of the coater cup deformation testing device  100  of  FIG.  1 A . 
     As shown in  FIGS.  1 B and  1 C , in this embodiment, shapes of the plate  120 , the plate  130  and the plate  140  are circle, and the plate  120 , the plate  130  and the plate  140  can respectively receive cups forming a coater cup device used to accumulate a wafer. In some embodiment, since a shape of the wafer is circle generally, shapes of the cups forming the coater cup device are circle. Therefore, the circle cups forming the coater cup device can be respectively received by the plate  120 , the plate  130  and the plate  140  with circle shapes if no deformation appears on the cups. In other words, it can be determined whether the cups have deformations according to that whether the cups can be received by the plates (e.g. plates  120 ,  130  and  140  in  FIG.  1 A ). 
     A shape of the supporting board  110  is circle, and the supporting board  110  has a center  110 O. In this embodiment, the supporting board  110 , the plate  120 , the plate  130  and the plate  140  are concentric circles with the same center  110 O. 
     Return to  FIG.  1 A . In this embodiment, the supporting board  110  has a diameter  110   d , the plate  120  has a diameter  120   d , the plate  130  has a diameter  130   d  and the plate  140  has a diameter  140   d . As shown in  FIG.  1 A , the diameter  110   d  is the greatest one of the diameters  110   d ,  120   d ,  130   d  and  140   d , so that the supporting board  110  can support the plate  120 , the plate  130  and the plate  140 . The diameter  130   d  is slightly greater than the diameter  120   d , and the diameter  140   d  is less than any of the diameters  120   d  and  130   d . 
     Please refer to  FIG.  1 B . The top view from the first side surface  111  shown in  FIG.  1 B  illustrates the supporting board  110  and the plate  120  located on the supporting board  110 . The supporting board  110  has a periphery  110   e . The plate  120  has a periphery  120   e . As mentioned above, the supporting board  110  and the plate  120  are concentric circles with the same center  110 O. Refer to  FIGS.  1 A and  1 B , the diameter  110   d  of the supporting board  110  is greater than the diameter  120   d  of the plate  120 . 
     Similarly, please refer to  FIG.  1 C . The bottom view from the second side surface  112  shown in  FIG.  1 C  illustrates the supporting board  110 , the plate  130  and the plate  140 . The plate  130  has a periphery  130   e . The plate  140  has a periphery  140   e . Refer to  FIGS.  1 A and  1 C , in this embodiment the supporting board  110 , the plate  130  and the plate  140  are concentric circles with the same center  110 O, the diameter  110   d  of the supporting board  110  is greater than the diameter  130   d  of the plate  130 , and the diameter  140   d  of the plate  140  is less than the diameter  130   d  of the plate  130 . 
     In some embodiments, the plate  140  can be not located on the plate  130   d  but on the plate  120 . In such case, the diameter  140   d  is still less than the diameter  120   d  of the plate  120 . 
     In some embodiments, the shape of the supporting board  110  can be different from circuit and have an area greater than any of areas of the plate  120 , the plate  130  and the plate  140 . An area of each of the plates  120 ,  130  and  140  is less than the area of the supporting board  110 . In other words, a projection of each of the plates  120 ,  130  and  140  on the supporting board  110  is formed within the supporting board  110 . 
     The plates with different diameters are used to receive the cups with different sizes. For details, please refer to following discussions. 
     In some embodiments, materials of the supporting board  110 , the plate  120 , the plate  130  and the plate  140  are transparent, and a ruler can be provided or marked on the supporting board  110  to measuring the deformations by scales of the ruler. In such case, the ruler on the supporting board  110  can be shown on the plate  120 , the plate  130  and the plate  140  since the supporting board  110 , the plate  120 , the plate  130  and the plate  140  are transparent. For details, please also refer to following discussions. 
     In some embodiments, material of the transparent supporting board  110 , the plate  120 , the plate  130  and the plate  140  includes acrylic. 
     Reference is made by  FIGS.  2 A and  2 B .  FIG.  2 A  illustrates an exploded view of a coater cup device  200  according to one embodiment of the present disclosure.  FIG.  2 B  illustrates a cross-section view of the coater cup device  200  of  FIG.  2 A , wherein the coater cup device  200  can be used to accumulate a semiconductor wafer  300 . 
     As shown in  FIGS.  2 A and  2 B , in this embodiment, the coater cup device  200  includes a bottom cup  210 , an upper cup  220 , a middle cup  230  and an inner cup  240 . The inner cup  240  is configured in the bottom cup  210 . The middle cup  230  and the upper cup  220  and located on the bottom cup  210  and the inner cup  240  sequentially. 
     In  FIG.  2 B , the inner cup  240  is located on a holder  213  of the bottom cup  210 , and the holder  213  has an edge  211 . The edge  211  of the holder  213  can be regarded as an edge of the bottom cup  210 . A spin chuck  243  is located on the inner cup  240 . A spin motor is configured within the holder  213 . For the purpose of simplify, the spin motor is not shown in figures. The spin chuck  243   is located on the spin motor within the holder  213  and contact with the edge  211  of the holder  213 . Therefore, the semiconductor wafer  300  can be positioned on the spin chuck  243 . By using a rotation structure connected to the spin chuck  243 , the semiconductor wafer  300  located on the spin chuck  243  can be rotated, and a spin coating process for the semiconductor wafer  300  can be performed. 
     As shown in  FIG.  2 B , the semiconductor wafer  300  and the bottom cup  210  are further covered by the middle cup  230 , which includes a shield  233  extending diagonally upward to a center of the coater cup device  200 . The middle cup  230  has an edge  231  (as shown in following  FIG.  3   ), and the middle cup  230  is contact with the bottom cup  210  by the edge  231 . The shield  233  and a sidewall  246  of the inner cup  240  beyond the spin chuck  243  form a flowing path  250 . Once a spin coating process is performed on the semiconductor wafer  300 , the flowing path  250  is used to receive coatings during the spin coating process, so that the coatings can be removed through the flowing path  250 . 
     The bottom cup  210 , the inner cup  240  and the middle cup  230  are further covered by the upper cup  220 . As shown in  FIG.  2 B , the upper cup  220  has an edge  221  (as shown in following  FIG.  3   ), and the upper cup  220  is contact with the middle cup  230  through the edge  221 . The upper cup  220  is used to prevent the coating on the semiconductor wafer  300  from splashing out of the coater cup device  200  during the spin coating process. 
     A number of the plates (e.g. plates  120 ,  130  and  140 ) of the coater cup deformation testing device  100  is determined according to a number of cups forming the coater cup device to be tested. In this embodiment, the coater cup deformation testing device  100  is used to test a coater cup device  200  formed by three cups as shown in the  FIGS.  2 A and  2 B , the coater cup deformation testing device  100  includes three plates, and the number of the plates of the coater cup deformation testing device  100  is the same as the number of the cups of the coater cup device  200 . 
     In some embodiments, a coater cup device used to accumulate a wafer can be formed by two cups, which include a bottom cup supporting a wafer holder and an upper cup covering the bottom cup and the wafer holder to avoid coatings splashes. In such case, a coater cup deformation testing device can include only two plates, and the number of the plates of the coater cup deformation testing device is the same as the number of the cups of the coater cup device. 
     To describe detailed deformation operations by using the coater cup deformation testing device  100 , please refer to following  FIGS.  3 - 6   .  FIGS.  3 - 6    illustrate schematic views corresponding to different operations of a method of coater cup deformation testing of the present disclosure. 
     In an operation of the method of coater cup deformation testing, a coater cup device  200  is provided. The example coater cup device  200  is provided as shown in  FIGS.  2 A and  2 B . The coating coater cup device  200  includes the bottom cup  210 , the upper cup  220 , the middle cup  230  and the inner cup  240 . The inner cup  240  is rotatably located on the bottom cup  210  to support a semiconductor wafer  300 , as shown in  FIG.  2 B . The upper cup  220  and the bottom cup  210  form a space accumulating the semiconductor wafer  300  supported by the inner cup  240  within the space. 
     In an operation of the method of coater cup deformation testing, a coater cup deformation testing device  100  is provided. The example coater cup deformation testing device  100  is provided as shown in  FIGS.  1 A- 1 C . The number of the plates of the coater cup deformation testing device  100  is determined based on the number of the cups of the coater cup device  200 , thereby being three. In this embodiment, the coater cup deformation testing device  100  includes the supporting board  110 , the plate  120 , the plate  130  and the plate  140 . The supporting board  110 , the plate  120 , the plate  130  and the plate  140  are circular. The plate  120  and the plate  130  respectively located on the first side surface  111  and the second side surface  112  of the supporting board  111 . The plate  140  is located on the plate  130 . 
     Once the bottom cup  210 , the middle cup  220  and the upper cup  230  are deformed, deformations of the bottom cup  210 , the middle cup  220  and the upper cup  230  reflect on the edges  211 ,  221  and  231 , respectively. In such case, it is possible that the upper cup  220 , the shield  233  of the middle cup  230  or the spin chuck  243  is unexpected contact with and damages with the semiconductor wafer  300 . 
     The plates (e.g. plates  120 ,  130  and  140 ) of the coater cup deformation testing device  100  are designed to have matched diameters to receive the cups of the coater cup device  200 . If one the cups of the coater cup device  200  are deformed, the corresponding plate cannot receive the deformed cup. 
       FIG.  3    illustrates a cross-section view of cups forming the coater cup device  200  of  FIG.  2 A . In one embodiment of the present disclosure, operations of the method of coater cup deformation testing include disassembling the coater cup device  200  used to accumulate the semiconductor wafer  300 . 
     As shown in  FIG.  3   , the coater cup device  200  is disassembled and the inner cup  240  has been removed. The disassembled coater cup device  200  includes the bottom cup  210 , the middle cup  230  and the upper cup  220 . As mentioned above, in this embodiment, the bottom cup  210  is contact with the removed inner cup  240  through the edge  211  of the holder  213 , the middle cup  230  is contact with the bottom cup  210  through the lower edge  231  and has the shield  233  for avoiding the splash of the coatings, the upper cup  220  is contact with the middle cup  230  through the lower edge  221 . 
       FIGS.  4 - 6    illustrate cross-section views of plates of the coater cup deformation testing device  100  receiving the cups of the coater cup device  200  according to one embodiment of the present disclosure. 
     Once one of two cups being in contact with each other is deformed, it can be easily determined whether any of the two cups is deformed by appearance when the coater cup device is assembled. For two or more cups being in contact with each other and deformed, please refer to following discussion. 
       FIG.  4    illustrates an operation of the method of coater cup deformation testing. As shown in  FIG.  4   , the upper cup  220  of the coater cup device  200  is received by the plate  120  of the coater cup deformation testing device  100 . 
     In this embodiment, the lower edge  221  of the upper cup  220  is a circle, and the plate  120  is designed to be a circle with the diameter  120   d  being the same as the diameter of the lower edge  221 . Therefore, as shown in  FIG.  4   , if no deformation appears on the upper cup  220 , the upper cup  220  can be received on the plate  120 , and the periphery  120   e  of the plate  120  is within the edge  221  of the upper cup  220 . The diameter  120   d  of the plate  120  is slightly less than the edge  221  of the upper cup  220 . 
     In some embodiment, after the upper cup  220  is received by the plate  120 , the upper cup  220  can be further rotated to determine whether the upper cup  220  is deformed. If the upper cup  220  has been deformed from the circle to an oval, the upper cup  220  cannot rotate along the plate  120 . 
     If the upper cup  220  is deformed to an oval, the upper cup  220  cannot be received by the plate  120  since the edge  221  of the upper cup  220  is not a circle. If the upper cup  220  is stretched, it is easily observed that the edge  221  of the upper cup  220  has a greater diameter with respect to the plate  120  after the stretched upper cup  220  is received by the plate  120 . 
     Therefore, it can be determined that whether the upper cup  220  is deformed according to that whether the upper cup  220  can be received by the plate  120  and the upper cup  220  can rotate along the plate  120  after the upper cup  220  is received by the plate  120 . 
       FIG.  5    also illustrates an operation of the method of coater cup deformation testing. In  FIG.  5   , the middle cup  230  is received by the plate  130 , such that the middle cup  230  is positioned on the plate  130  and the periphery  130   e  of the plate  130  is located within the lower edge  231  of the middle cup  230 . 
     The diameter  130   d  of the plate  130  is slightly less than the edge  231  of the middle cup  230 . Similarly, the edge  231  of the middle cup  230  can reflect the deformations of the middle cup  230 . If the middle cup  230  is deformed to an oval, the middle cup  230  cannot be received by the plate  130  since the edge  231  of the middle cup  230  is not a circle. If the middle cup  230  is stretched, it is easily observed that the edge  231  of the middle cup  230  has a greater diameter with respect to the plate  130  after the stretched middle cup  230  is received by the plate  130 . 
     In some embodiment, after the middle cup  230  is received by the plate  130 , the middle cup  230  can be further rotated to determine whether the middle cup  230  is deformed. If the middle cup  230  has been deformed from the circle to an oval, the middle cup  230  cannot rotate along the plate  130 . 
       FIG.  6    also illustrates another operation of the method of coater cup deformation testing. In  FIG.  6   , the bottom cup  210  of the coater cup device  200  is received by the plate  140  of the coater cup deformation testing device  100 . Specifically, the holder  213  of the bottom cup  210  is received by the plate  140 . After receiving the holder  213  of the bottom cup  210 , the holder  213  is located on the plate  130 , and the periphery  140   e  of the plate  140  is located within the edge  211  of the holder  213 . 
     In some embodiment, it can be determined that whether the bottom cup  210  is deformed according to that whether the bottom cup  210  can be received by the plate  140  and the bottom cup  210  can rotate along the plate  140  after the bottom cup  210  is received by the plate  140 . In some embodiments, if the bottom cup  210  is deformed to an oval, the bottom cup  210  cannot be received by the plate  140  since the edge  211  of the bottom cup  210  is not a circle. If the bottom cup  210  is stretched, it is easily observed that the edge  211  of the bottom cup  210  has a greater diameter with respect to the plate  140  after the stretched bottom cup  210  is received by the plate  140 . 
     In some embodiment, the diameter  120   d  of the plate  120  is about 410 mm, the diameter  130   d  of the plate  130  is about 409 mm, which is less than the diameter  120   d , and the diameter  140   d  of the plate  140  is about 217.6 mm, which is less than the diameter  130   d . 
       FIG.  7    illustrates a re-determination operation of the coater cup device by using a test wafer according to one embodiment of the present disclosure. The re-determination operation can be regarded as an operation of the method of coater cup deformation testing according to one embodiment of the present disclosure. In this embodiment,  FIG.  7    illustrates a defect map of the test wafer located in the tested coater cup device  200 , which is formed by un-deformed cups. 
     After the cups of the coater cup device  200  are received by the plates of the coater cup deformation testing device  100 , it can be determined that whether the cups of the coater cup device  200  are deformed. Therefore, it prevents the semiconductor processed in the coater cup device  200  from being damaged, and quality of the semiconductor processed in the coater cup device  200  can be confirmed. 
     In some embodiments, if one of the cups of the coater cup device  200  are deformed, the deformed cup can be fixed or replaced by an un-deformed cup. 
     To confirm the deformation situation of the coater cup device  200 , a test wafer can be further positioned within the tested coater cup device  200 .  FIG.  7    includes three graphs P1, P2 and P3, which are respectively corresponding to the test wafer in the tested coater cup device  200 . Defects are presented as black points in graphs P1, P2 and P3. 
     Please refer the graphs P1 and P2. The graph P1 reflects defects on the test wafer in the tested coater cup device  200 , which includes un-deformed cups. After being processed in the tested coater cup device  200  with the un-deformed cups, the test wafer is reflected on the graph P2, which presents fewer defects with respect to the graph P1. In some embodiments, the process of the test wafer in the tested coater cup device  200  is a coating process. 
     It should be noted that a ring-like defect appears on the test wafer if any of the cups (e.g. the upper cup  220  or the shield  233  of the middle cup) of the coater cup device  200  or the wafer holder  240  is contact with the test wafer. As shown in the graph P2, there is no ring-like defect appearing on the test wafer. The graph P3 presents the further defect from the graph P1 to the graph P2. Comparing the graphs P1 and P2, the graph P3 shows the comparison result and presents the additional defect on the graph P2 and beyond the graph P1, and there is no ring-like defect on the graph P3. Therefore, it can be confirmed that the coater cup device  200  is un-deformed. 
     Reference is made by  FIGS.  8 A and  8 B .  FIG.  8 A  illustrates a bottom view of a coater cup deformation testing device  400  according one embodiment of the present disclosure.  FIG.  8 A  illustrates a bottom view from a second side surface  412  of the supporting board  410 .  FIG.  8 B  illustrates a local view of a ruler on the supporting board  410  of the coater cup deformation testing device  400  of  FIG.  8 A .  FIG.  8 B  illustrates a region R between the periphery  430   e  and the periphery  410   e  in  FIG.  8 A . 
     In this embodiment, a coater cup deformation testing device  400  includes a supporting board  410 , a plate on a first side surface of the supporting board  410  (not shown), a plate  430  on a second side surface  412  of the supporting board  410  and the plate  440  located on the plate  430 . As shown in  FIG.  8 A , the supporting board  410 , the plate  430  and the plate  440  are concentric circles with the same center  410 O. 
     In this embodiment, the supporting board  410  includes ruler  451  and  452 . In  FIG.  8 B , the rulers  451  are located between the periphery  410   e  of the supporting board  410  and the periphery  430   e  of the plate  430 . Scales of the rulers  451  and  452  are arranged along a direction from the center  410 O of the supporting board  410  to the periphery  410   e  of the supporting board  410 . As shown in  FIG.  8 B , scales of one of the rulers are arranged between the periphery  410   e  of the supporting board  410  and the periphery  430   e  of the plate  430  at equal intervals. In some embodiments, a length between two immediately-adjacent scales is 1 mm. 
     In some embodiments, a coater cup device  200  as shown in  FIGS.  2 A and  2 B  is provided. Once an upper cup  220  of the coater cup device  200  is received by the plate  430 , the upper cup  220  received by the plate  430  can be aligned with the scales of the ruler  451  between the edges  410   e  and  430   e . If the upper cup  220  is deformed and extends beyond the plate  430 , a sized differential of the deformed upper cup  220  can be defined by the scales of the ruler  451 . 
     In some embodiments, the supporting board  410  is transparent, the scales of the ruler  451  on the supporting board  410  can be configured on at least one of the first side surface and the second side surface  412 , and the scales of the ruler  451  can be shown on both side surfaces of the supporting board  410 . For example, the scales of the ruler  451  can be marked on the second side surface  412  of the supporting board  410 . Therefore, the scales of ruler  451  can be also used for a bottom cup  210  of the coater cup device  200 . When the bottom cup  210  is received by the plate on a first side surface (not shown), the bottom cup  210  can be also aligned with the scales of the ruler  451  present on the first side surface to define the size differential of the bottom cup  210  if the bottom cup  210  is deformed and extends beyond the plate on the first side surface. 
     As shown in  FIG.  8 A , four regions of the rulers  451  are arranged along a cross-line across the center  4100 . In other words, the four regions of the rulers  451  are located on the four points between the periphery  430   e  of the plate  430  and the periphery  410   e  of the supporting board  410 . In this way, deformations along different directions of the upper cup  220  can be defined by the rulers  451 . 
     Similarly, in this embodiment, four regions of the rulers  452  are arranged along a cross-line across the center  4100 . As shown in  FIG.  8 A , the four regions of the rulers  452  are at the periphery  440   e  of the plate  440 . The four regions of the rulers can be used to define the deformations in different directions when a bottom cup  210  of the coater cup device  200  is received by the plate  440 . In this embodiment, scales of the ruler  452  in the same regions are arranged along the direction form the center  4100  of the supporting board  410  to the periphery  410   e  of the supporting board  410  at equal intervals. 
     In some embodiments, the coater cup deformation testing devices of the present disclosure can be regarded as coater cup deformation testing jigs, thereby removing coater cup device with deformed cups. 
     In summary, a coater cup deformation testing device of the present disclosure can include a supporting board and plates for testing. The plates on the supporting board can have similar shapes with cups of a coater cup device, so that the cups of the coater cup device can be received by the plates of the coater cup deformation testing device if the cups are not deformed. In some embodiments, rulers can be provided on coater cup deformation testing device to measure and define the deformations of the cup of the coater cup device. Therefore, it can be determined that whether the coater cup device is deformed based on the receiving situations of the cups and plates. 
     Although the embodiments of the present disclosure have been described in considerable detail with reference to certain embodiments thereof, other embodiments are possible. Therefore, the spirit and scope of the appended claims should not be limited to the description of the embodiments contained herein. 
     It will be apparent to those skilled in the art that various modifications and variations can be made to the structure of the embodiments of the present disclosure without departing from the scope or spirit of the present disclosure. In view of the foregoing, it is intended that the present disclosure cover modifications and variations of this invention provided they fall within the scope of the following claims.