Abstract:
There is provided a method and an apparatus for manufacturing a semiconductor device having a lidless and highly reliable flip-chip structure. The method for manufacturing a semiconductor device wherein an underfill resin is filled in a space between a substrate and a semiconductor chip includes injecting a first underfill resin in said space under a first injecting condition; specifying a location where the fillet height of the underfill resin formed on the side of said semiconductor chip does not meet a prescribed standard; and injecting a second underfill resin in a location where the fillet height does not meet the prescribed standard under a second injecting condition. Since the fillet heights can uniformly meet the prescribed standard, the concentration of stress can be avoided, and a semiconductor device having a lidless and highly reliable flip-chip structure can be manufactured.

Description:
BACKGROUND OF THE INVENTION 
       [0001]    1. Field of the Invention 
         [0002]    The present invention relates to a method and an apparatus for manufacturing a semiconductor device that has a flip-chip structure. 
         [0003]    2. Description of the Related Art 
         [0004]    With the intensifying price competition of semiconductor devices in recent years, cost reduction has been strongly requested. To meet the request, a semiconductor device having a flip-chip structure, in which a lid  18  and a stiffener  17 , which were equipped to conventional semiconductor devices having a flip-chip structure, are removed (hereafter referred to as a “lidless structure”) wad developed.  FIG. 1  is a schematic diagram showing a conventional semiconductor device that has a flip-chip structure; and  FIG. 2  is a schematic diagram showing a semiconductor device that has a lidless structure. 
         [0005]    Documents related to conventional flip-chip mounting will be described below. Japanese Patent Application Laid-Open No. 2000-188362 discloses an example of mounted structures wherein filler is filled in the portion where a semiconductor element is mounted on a wiring substrate, such as a package, in flip-chip mounting. By this method, the adhesive strength of the filler to the wiring substrate is intensified by forming grooves in the wiring substrate located on the lower portion of the fillet portion formed around the semiconductor element. 
         [0006]    Japanese Patent Application Laid-Open No. 2000-277566 discloses an example wherein a bare IC chip is connected to a wiring substrate by electrically conductive particles mixed in the insulating resin of an anisotropic conductive adhesive. This method proposes that by forming a large number of knobs (irregularity) on the outer surface of the fillet of the anisotropic conductive adhesive running off the bare IC chip, low mechanical joint strength or defective electrical connection between the wiring substrate and the electronic parts is prevented before happening. 
         [0007]    Japanese Patent Application Laid-Open No. 2005-217005 discloses a resin applying apparatus for applying an underfill resin between a substrate and a face-down mounted semiconductor element. This apparatus is equipped with a nozzle for injecting the underfill resin, and a nozzle moving unit provided so that the nozzle moves along the vicinity of boundary between the semiconductor element and the substrate; and is characterized in that the whole fixing table for fixing the substrate swings synchronizing the movement of the nozzle. The object of this configuration is to evenly apply the resin on the entire surface of the semiconductor chip in a short time. 
         [0008]    Japanese Patent Application Laid-Open No. 2007-194403 discloses an apparatus for manufacturing an electronic device wherein the space between a semiconductor chip and a mounting substrate is filled with an underfill agent. This apparatus includes a sensing unit for sensing a fillet portion formed in the underfill agent on the side of the semiconductor chip, and a controlling unit for additionally discharging the underfill agent when the sensed width of the fillet portion is narrower than the proper fillet width. 
         [0009]    Japanese Patent Application Laid-Open No. 10-098075 discloses a method for mounting a semiconductor for face-down connecting a semiconductor chip to a wiring substrate. In this method, by applying no solder resist to the site of semiconductor chip mounting so as to widen the space between the semiconductor chip and the wiring substrate, and by using the wiring substrate whose periphery is coated with the solder resist, an insulating resin easily invade into the space to improve the injecting characteristics of the insulating resin. 
       SUMMARY 
       [0010]    The lidless structure is more advantageous in terms of costs than conventional structures. On the other hand, due to the absence of the lid  18  and the stiffener  17  that is responsible for reinforcement, the lidless structure is relatively fragile to physical deformation and the like. Therefore, under certain conditions, a phenomenon wherein the semiconductor chip  11  or the solder bump  12  is broken (hereafter referred to as “crack”) may occur to cause defects. It is demanded to suppress the defects caused by such reasons, and to raise the reliability of the semiconductor device. 
         [0011]    The problems related to the present invention will be described in further detail. In a semiconductor device having a flip-chip structure, a semiconductor chip  11  with the electronic circuit surface facing down is disposed on the wiring substrate  13 .  FIG. 3  is a schematic diagram showing the semiconductor device having a lidless structure. The semiconductor chip  11  is electrically connected to the wiring substrate  13  by solder bumps  12 . The gap between the semiconductor chip  11  and the wiring substrate  13  is filled with the underfill resin  14 . The underfill resin  14  is divided into a part to fill the gap between the semiconductor chip  11  and the wiring substrate  13  (hereafter referred to as “under-chip resin  14   a ”), and a part adhered to the side of the semiconductor chip  11  (hereafter referred to as “fillet  14   b ”). 
         [0012]    When the temperature of the semiconductor device changes, strain and stress as shown in  FIG. 4  are generated due to the difference in the coefficient of thermal expansion between the wiring substrate  13  and the semiconductor chip  11 . The underfill resin  14  is a thermosetting organic resin with an adjusted coefficient of thermal expansion, and reduces the generated strain and stress by the elasticity of the resin to protect the solder bumps  12 . 
         [0013]    The underfill resin  14  is injected into the gap between the semiconductor chip  11  and the wiring substrate  13  in the following procedures. An apparatus that has an ability to discharge the resin at a constant rate is used, and the needle  16  that discharges the resin is moved along an optional side of the semiconductor chip  11  to inject the resin (this procedure is hereafter referred to as “I-path”). The injected underfill resin  14  fills the gap between the semiconductor chip  11  and the wiring substrate  13  by capillary phenomenon as shown in  FIG. 6 . After the under-chip resin  14   a  has been completely injected, the needle  16  is continuously moved along the entire sides of the semiconductor chip  11  as shown by the arrow in  FIG. 7  to inject the resin (this procedure is hereafter referred to as “O-path”). By these procedures, the under-chip resin  14   a  can be surely injected, and uniform fillets  14   b  can be formed on the entire sides of the semiconductor chip  11 . 
         [0014]    The semiconductor device with the lidless structure manufactured by these procedures has a possibility wherein cracks may occur in the semiconductor chip  11  and the fillets  14  causing electrical defects, and further causing the lower yield unless special measures are taken. 
         [0015]    When the temperature of the semiconductor device is changed, strain and stress as shown in  FIG. 8  occur due to difference in the coefficients of thermal expansion between the semiconductor chip  11  and the wiring substrate  13 . In the semiconductor device with lidless structure, a large stress is generated because of the absence of the lid  18  and the stiffener  17  that suppress deformation. Particularly a large stress is applied to the boundary  19  between the semiconductor chip  11  and the fillets  14   b  as  c,  and cracks are easily generated.  FIG. 9  is a schematic diagram showing a generated crack  15 . 
         [0016]    This problem can be reduced by changing the material for the underfill resin  14  to lower the tensile stress c. Also by lowering the height of the fillets  14   b  than the upper surface, which is opposite to the surface where solder balls of the semiconductor chip  11  are provided (this structure is hereafter referred to as “low fillet  14   c ”), the stress applied to the boundary  19  becomes smaller than the stress generated in the structure shown in  FIGS. 8 and 9 , and the generation of cracks  15  can be suppressed. 
         [0017]    To form the low fillet  14   c,  the quantity of the underfill resin  14  to be injected must be small. However, because of the procedures for filling the under-chip resin  14   a  through the I-path, when the quantity of the resin to be injected is simply reduced, the shape of the fillet  14   b  becomes non-symmetric and non-uniform as shown in  FIG. 11 . Although the diagram of a low fillet at least bilaterally symmetric is shown in Patent Documents 1 and 5, there is high possibility that the structures are actually non-symmetric. If a structure is non-symmetric and non-uniform, the stress applied to the boundary also becomes non-uniform, and local cracks are produced. As a result of non-uniform structure, the fillet height is lowered, and the side of the interlayer insulating film that constitutes the multilayer wiring structure formed on the circuit-forming side of the chip may be exposed. If the side of the interlayer insulating film, especially the side of the low-permittivity (low-k) film having a relative permittivity lower than the relative permittivity of SiO2 is exposed, defect, such as peeling off, may occur due to the absorption of moisture. 
         [0018]    If the method according to Japanese Patent Application Laid-Open No. 2000-277566 for mounting the chip from the upper surface of the underfill resin  14  applied onto the wiring substrate  13  is used in place of the method wherein the underfill resin  14  is injected after mounting the semiconductor chip  11 , the height of the fillets  14   b  can be adjusted by adjusting the quantity of the underfill resin  14 . By this method, however, the adhesion between the solder bumps  12  and the wiring substrate  13  tends to be lowered, and reliability tends to be deteriorated. 
         [0019]    Therefore, a method and an apparatus for manufacturing a highly reliable semiconductor device having a lidless flip-chip structure are required. 
         [0020]    The method for solving the problems will be described using reference numerals with parentheses used in “Detailed Description of the Preferred Embodiments”. These reference numerals are added for clarifying the correspondence relationship between descriptions in “Claims” and “Detailed Description of the Preferred Embodiments”. However, these reference numerals should not be used for translating the technical scope of the invention described in “Claims”. 
         [0021]    A method for manufacturing a semiconductor device is a method for manufacturing a semiconductor device wherein an underfill resin ( 14 ) is filled in a space between a substrate ( 13 ) and a semiconductor chip ( 11 ), including injecting a first underfill resin in said space under a first injecting condition; specifying a location where the fillet height (b) of the underfill resin formed on the side of said semiconductor chip does not meet a prescribed standard; and injecting a second underfill resin in a location where the fillet height (b) does not meet the prescribed standard under a second injecting condition. 
         [0022]    An apparatus for manufacturing a semiconductor device according to the present invention is an apparatus for manufacturing a semiconductor device ( 30 ) wherein an underfill resin ( 14 ) is filled in a space between a substrate ( 13 ) and a semiconductor chip ( 11 ), and includes a sensing unit ( 33 ) for sensing the fillet height (b) of the underfill resin formed on the side of the semiconductor chip; a specifying unit ( 38 ) for specifying a location where the fillet height b does not meet a prescribed standard; and an additional-injecting condition selecting unit ( 39 ) for selecting the injecting condition when the underfill resin is additionally injected to the specified location depending on the detected height of the fillet (b) so that the fillet height (b) meets the prescribed standard. 
         [0023]    According to the present invention, since a semiconductor device adjusted so that the fillet height of the underfill resin meets the prescribed standard is manufactured, there are provided a method and an apparatus for manufacturing a reliable semiconductor device that suppresses the concentration of stress caused by difference in the coefficient of thermal expansion between the semiconductor chip and the wiring substrate, and has a lidless flip-chip structure. 
         [0024]    According to the present invention, a method and an apparatus for manufacturing a reliable semiconductor device having a lidless flip-chip structure is provided. 
       DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS 
       [0025]    The preferred embodiments for carrying out the present invention will be described in detail below referring the drawings. 
       First Embodiment 
       [0026]      FIG. 12  is a sectional view showing a semiconductor device according to the first embodiment viewed from the side. The semiconductor device has a flip-chip structure and a lidless structure. Solder balls  22  used for electrical connection are fixed on the rear surface of a wiring substrate  13 . A semiconductor chip  11  is flip-chip connected to the surface of the wiring substrate  13  via solder bumps  12 . An underfill resin  14  is injected into the gap between the surface of the wiring substrate  13  and the rear surface of the semiconductor chip  11  for protecting the solder bumps  12 . The underfill resin  14  coats the side of the semiconductor chip  11 . The upper end of the underfill resin  14  is lower than the upper surface of the semiconductor chip  11 . Specifically, the fillet formed by the underfill resin  14  on the side of the semiconductor chip  11  is a low fillet  14   c.  The height b of the low fillet  14   c  is not more than 80% the height a of the semiconductor chip  11 , and is evenly controlled on all the sides of the semiconductor chip  11  (four sides of the semiconductor chip that has a square plane shape). 
         [0027]    When the temperature of a semiconductor device changes, the device is deformed and generates strain and stress due to difference in coefficients of thermal expansion of the materials. Since the low fillet  14   c  is formed lower and smaller than the high fillet (fillet  14   b  shown in  FIG. 8 ), the stress c generated between the low fillet  14   c  and the semiconductor chip  11  is smaller than the stress generated by the semiconductor device having a high-fillet structure. Thereby, the possibility of crack generation between the chip and the fillet is lowered, and the possibility of electrical damage of the semiconductor device is suppressed. As a result, the reliability of the semiconductor device can be improved. 
         [0028]    The effect achieved by the first embodiment will be described below. Although the underfill resin  14  is prepared so as to have a coefficient of thermal expansion close to the coefficient of thermal expansion of silicon that constitutes the semiconductor chip  11 , the underfill resin  14  has a coefficient of thermal expansion higher than the coefficient of thermal expansion of silicon for securing fluidity or the like. Therefore, when the semiconductor device is heated, compressive stress e is generated in the location of the semiconductor chip  11  shown in  FIG. 13 . On the other hand, at a low temperature, tensile stress c is generated in the location shown in  FIG. 8 . These stresses intensify as the semiconductor chip  11  becomes larger, and especially becomes higher at the corners of the semiconductor chip  11 . 
         [0029]    The crack  15  is mainly produced at a low temperature, and rupture as shown in  FIG. 14  is generated to produce the crack  15 . The produced crack  15  expands to the electronic-circuit surface  20 , and may also reach the solder bumps  12  and the wiring substrate  13  depending on the location. If such matters happen, the semiconductor device is electrically damaged and broken. 
         [0030]    The tensile stress c applied to the semiconductor chip  11  depends on the height of the fillet. As a result of the simulation of stress by the inventors of the present application, it was clarified that the stress was lowered by 2% when the height b of the fillet was lowered by 17% than the height a of the chip. Also, the lower limit of the fillet height is preferably a height to cover at least the side of the interlayer insulating film that constitutes a multilayer wiring structure formed on the circuit-forming surface of the chip. Particularly, when a low-k film having a relative permittivity lower than the relative permittivity of SiO2 is formed, it is preferable that at least the side of the low-k film is covered. 
       Second Embodiment 
       [0031]    The second embodiment will be described referring to  FIG. 15 . In the second embodiment, the semiconductor device has a flip-chip structure and a lidless structure. The semiconductor chip  11  is electrically connected to the wiring substrate  13  by solder bumps  12 . The underfill resin  14  is injected to protect solder bumps  12  using the following procedures. 
         [0032]    An under-chip resin  14   a  is injected using the I-path. An underfill resin  14  is injected into only the portion where the underfill resin  14  shown in  FIG. 2  has not formed sufficient low fillets  14   c  (hereafter referred to as “resin-insufficient portion  21 ”) to form uniform low fillets  14   c  on all the sides of the semiconductor chip  11 . 
         [0033]    The under-chip resin  14   a  is injected using the capillary phenomenon through the I-path. At this time, a part of the underfill resin  14  forms the low fillets  14   c  on the side of the semiconductor chip  11 . As a result, a non-symmetric structure wherein the portion where low fillets  14   c  are sufficiently formed and the portion where low fillets  14   c  are insufficiently formed are mixed as shown in  FIG. 15 . 
         [0034]    Therefore, by injecting the underfill resin  14  only into the resin-insufficient portion  21  to selectively form the low fillets  14   c  in the resin-insufficient portion  21 , uniform low fillets  14   c  can be formed on all the sides of the semiconductor chip  11 . By combining a method for injecting the underfill resin  14  using an ink-jet system in addition to the needle  16 , the injection of the underfill resin  14  into the resin-insufficient portion  21  can be controlled more accurately instead of using the needle  16 , and low fillets  14   c  of higher quality can be formed. 
         [0035]    When the underfill resin  14  is injected using the I-path, low fillets  14   c  are formed on a part of the sides of the semiconductor chip  11  as the under-chip resin  14   a  is injected. The low fillets  14   c  are easily formed on the side where the underfill resin  14  has been injected, and poorly formed on the facing side and the vicinities of the corners of the chip. 
         [0036]    When the formation of the fillet  14   b  is intended, the uniform fillet  14   b  is formed on all the sides of the semiconductor chip  11  by injecting the underfill resin using the O-path after injecting the under-chip resin  14   a.  However, if the quantity of the underfill resin  14  of the O-path is reduced for the formation of the low fillets  14   c,  the low fillets  14   c  are formed in the resin-insufficient portion  21 , and the previously formed low fillets  14   c  becomes higher to be the fillet b, and as a whole, non-uniform structure wherein the fillet  14   b  and the low fillet  14   c  are mixed is formed. 
         [0037]    By performing injection of the underfill resin  14  limited to the resin-insufficient portion  21  in place of injection into the entire semiconductor chip  11  using the O-path, the low fillets  14   c  can be selectively formed in the resin-insufficient portion  21  while maintaining previously formed low fillets  14   c,  and uniform fillets  14   c  can be formed on all the sides of the semiconductor chip  11 . 
         [0038]    By using the method for manufacturing a semiconductor device according to the second embodiment, a semiconductor device according to the first embodiment can be easily fabricated. 
         [0039]    The following effects can be achieved by the first and second embodiments:
   1. Since stress applied to the semiconductor chip  11  and the fillets  14   b  with change in temperatures can be reduced, the occurrence of the crack  15  is prevented, and the quality of the semiconductor device is improved.   2. Uniform low fillets  14   c  can be easily formed on all the sides of the semiconductor chip  11  that realizes the above-described objects.   3. The injecting quantity of the underfill resin can be minimized, and the material costs can be reduced.   
 
       Third Embodiment 
       [0043]    The third embodiment will be described referring to  FIGS. 16 to 20 .  FIG. 16  shows an application work  22 , which is a subject to which an underfill resin is applied according to the third embodiment. The application work  22  is formed by connecting a semiconductor chip  11  on a wiring substrate  13  via solder bumps  12 . 
         [0044]      FIG. 17  shows the configuration of an apparatus for manufacturing  30  a semiconductor device according to the third embodiment of the present invention. The apparatus for manufacturing  30  is equipped with an applying unit  32  that supplies the underfill resin  14  into the gap between the semiconductor chip  11  and the wiring substrate  13  from the end of a side of the semiconductor chip  11  while moving along a set path; a sensing unit  33  that senses the height of the fillet  14   b  of the underfill resin  14  from the wiring substrate  13 ; and a computer that sets up the path and the injecting condition s to control the applying unit  32 . 
         [0045]    The underfill resin  14  is applied to the application work  22  as shown in  FIG. 18 . At this time, a temporary condition (injecting condition A) is set up as the injecting condition  35 . In the injecting condition A, at least one resin application is set up for the formation of uniform low fillet  14   c.  The controlling unit  31  controls the applying unit  32  according to the injecting condition A. After applying the resin, the application work  22  is subjected to heat treatment to cure the underfill resin  14 , and the fillet  14   b  is completed as shown in  FIG. 19 . 
         [0046]    After the underfill resin  14  has been cured, the sensing unit  33  observes the application work  22  from the side, and measures the height of the fillet  14   b.  The specifying unit  38  is a functional block to specify the characteristics of the fillet height, and classifies the fillet  14   b  into any of the normal fillet  14   d,  the uniform low fillet  14   c,  and the non-uniform low fillet  14   e  shown in  FIGS. 20A to 20C , respectively on the basis of previously registered standard as the height standard  36 , from the measured height of the fillet  14   b  and the previously set height of the semiconductor chip  11 . 
         [0047]    The normal fillet  14   d  is characterized in that a part of or the entire fillet  14  is higher than the semiconductor chip  11 . In this case, since the quantity of the underfill resin  14  set up in the injecting condition A is excessive, the specifying unit  38  changes the injecting condition A so as to decrease the quantity of the resin, and registers the changed injecting condition A as the injecting condition  35 . 
         [0048]    The uniform low fillet  14   c  is characterized in that the height of the entire fillet  14   b  is smaller than the height of the semiconductor chip  11 , and the height of the entire fillet  14   b  is uniform. 
         [0049]    The non-uniform low fillet  14   e  is characterized in that the height of the entire fillet  14   b  is smaller than the height of the semiconductor chip  11 , and the height of the entire fillet  14   b  is non-uniform. In this case, since the resin is deficient at a specified location, the additional-injecting condition selecting unit  39  estimates the location and quantity of the deficient resin, newly establishes or changes the injecting condition to compensate for insufficient resin (injecting condition B), and registers the condition as the additional the conditions as the additional injecting condition  37 . The one or a plurality of resin applications set up for compensating the resin-deficient location under the injecting condition A. 
         [0050]    When the injecting condition B is set up or changed, the controlling unit  31  controls the applying unit  32  so as to inject the underfill resin  14  again as shown in  FIG. 18  using the application work  22  before injecting the underfill resin  14 . At this time, injection using the injecting condition B is performed after injection using the injecting condition A. After application has been completed, heat treatment is performed to cure the resin, and the height of the fillet  14   b  is measured. If the fillet  14   b  is classified into the normal fillet  14   d  or the non-uniform low fillet  14   e  as a result of the measurement, the injecting condition A is replaced by the injecting condition B. 
         [0051]    The above-described procedures are repeated until the uniform fillet  14   c  is completed. The combination of the injecting condition A and the injecting condition B when the uniform low fillet  14   c  is formed is referred to as the injecting condition C. By applying the underfill resin  14  to the application work  22  using the injecting condition C, uniform low fillets  14   c  can be continuously formed. 
       Fourth Embodiment 
       [0052]    A method for manufacturing a semiconductor device according to the fourth embodiment can be realized by applying an apparatus for manufacturing equivalent to the third embodiment. In the same manner as in the description using  FIG. 18 , the underfill resin  14  is applied onto the application work  22 . At this time, a temporary condition (injecting condition A) is used as the injecting condition. In the injecting condition A, at least one resin application is set up for the formation of uniform low fillet  14   c.    
         [0053]    After the resin has been applied, the quantity of the underfill resin  14  applied onto the application work  22  is measured using a measuring apparatus  23  as shown in  FIG. 21 . The measuring apparatus  23  is an apparatus having functions to observe the application work  22  from the side, and measure the height to which the underfill resin  14  reaches at one or more locations. 
         [0054]    From the results of height measurement of the underfill resin  14 , the measuring apparatus  23  automatically classify the quantities of the resin on the application work  22  into excessive, deficient, and appropriate. 
         [0055]    When the resin quantity if excessive, the formation of the normal fillet  14   d  is estimated. Since the treatment according to the fourth embodiment cannot automatically respond to the normal fillet  14   d,  the measuring apparatus  23  reports prescribed outputs to the operator. When the operator receives the report, the operator changes the injecting condition A so that the resin quantity becomes deficient or appropriate, and carries out the resin applying shown in  FIG. 18  again. 
         [0056]    When the resin quantity is deficient, the formation of the non-uniform low fillet  14   e  is estimated. In this case, the region where the resin quantity is deficient and the deficient quantity are determined from the measurement result, and a resin injecting condition (injecting condition B) for compensate the deficient resin is selected. On the basis of the result of determination, the underfill resin  14  is applied to the region where the resin quantity is deficient using the injecting condition B as shown in  FIG. 22 . The determination and additional resin applying are automatically performed. By carrying out the treatment once or more, the resin quantity becomes appropriate. 
         [0057]    When the resin quantity is appropriate, the formation of the uniform low fillet  14   c  is estimated. In this case, the following process is carried out without performing additional applying. 
         [0058]    By previously setting up the injecting condition A so that the resin quantity does not become excessive, the uniform low fillets  14   c  can be automatically continuously formed by the above-described treatment. 
     
    
     BRIEF DESCRIPTION OF THE DRAWINGS  
       [0059]      FIG. 1  is a schematic diagram showing a semiconductor device that has a flip-chip structure according to a background art; 
         [0060]      FIG. 2  is a schematic diagram showing a (lidless) semiconductor device that has a flip-chip structure according to a background art; 
         [0061]      FIG. 3  is a schematic diagram showing a semiconductor device that has a lidless structure; 
         [0062]      FIG. 4  is a diagram showing the deformation of a semiconductor device that has a flip-chip structure due to change in temperatures; 
         [0063]      FIG. 5  is a schematic diagram showing the injection of an underfill resin  14  through an I-path; 
         [0064]      FIG. 6  is a diagram showing an under-chip resin  14   a  injected through the I-path; 
         [0065]      FIG. 7  is a diagram showing the injection of an underfill resin  14  through an O-path; 
         [0066]      FIG. 8  is a diagram showing a stress generated by the deformation of a semiconductor device according to a background art due to change in temperatures; 
         [0067]      FIG. 9  is a schematic diagram showing a crack  15  produced by a stress c; 
         [0068]      FIG. 10  is a diagram showing a stress generated by the deformation of a semiconductor device due to change in temperatures; 
         [0069]      FIG. 11  is a diagram showing a nonuniform low fillet  14   c;    
         [0070]      FIG. 12  is a schematic diagram showing a semiconductor device that has a flip-chip structure and a low-fillet structure; 
         [0071]      FIG. 13  is a diagram showing a stress e generated by the deformation of a semiconductor device due to change in temperatures; 
         [0072]      FIG. 14  is a schematic diagram showing a crack  15  produced by a stress c (during deformation); 
         [0073]      FIG. 15  is a diagram showing an additional resin injection for forming a uniform fillet shape; 
         [0074]      FIG. 16  is a diagram showing an applying work; 
         [0075]      FIG. 17  is a diagram showing the configuration of an apparatus for manufacturing a semiconductor device; 
         [0076]      FIG. 18  is a diagram showing the application of the underfill resin under injecting condition s A; 
         [0077]      FIG. 19  is a diagram showing the state of a completed fillet; 
         [0078]      FIGS. 20A to 20C  are diagrams showing the aspects of fillets; 
         [0079]      FIG. 21  is a diagram showing the measurement of the height of a fillet; and 
         [0080]      FIG. 22  is a diagram showing the application of the underfill resin under injecting conditions B.