WO2002003447A1 - Dispositif et procede de formation de bosse - Google Patents
Dispositif et procede de formation de bosse Download PDFInfo
- Publication number
- WO2002003447A1 WO2002003447A1 PCT/JP2001/005609 JP0105609W WO0203447A1 WO 2002003447 A1 WO2002003447 A1 WO 2002003447A1 JP 0105609 W JP0105609 W JP 0105609W WO 0203447 A1 WO0203447 A1 WO 0203447A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- bump
- bonding
- formation
- temperature
- heating
- Prior art date
Links
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- NJPPVKZQTLUDBO-UHFFFAOYSA-N novaluron Chemical compound C1=C(Cl)C(OC(F)(F)C(OC(F)(F)F)F)=CC=C1NC(=O)NC(=O)C1=C(F)C=CC=C1F NJPPVKZQTLUDBO-UHFFFAOYSA-N 0.000 claims description 23
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Classifications
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Definitions
- the present invention includes a bump strength improving device for improving a bonding strength between the above-mentioned electrode and the above-mentioned bump, for example, for a bump-formed component having a bump formed on an electrode of a semiconductor wafer or a semiconductor chip.
- the present invention relates to a bump forming apparatus and a bump forming method executed by the bump forming apparatus. More specifically, the present invention relates to a bump forming apparatus capable of stabilizing a bonding state between the electrode section and the bump when forming a bump on an electrode section of a semiconductor substrate, as compared with a conventional bump forming apparatus.
- the present invention relates to a bump forming method executed by the method described above, a recording medium on which a program capable of executing the bump forming method is recorded, and a bump-formed semiconductor substrate on which bumps are formed. Background art
- Such a bump forming apparatus includes a carry-in device for taking out the pre-bump-formed wafer from the first storage container for storing the semiconductor wafer before the bump is formed, and a second storage device for storing the bump-formed wafer after the bump is formed.
- a container and a bonding stage for mounting the wafer before bump formation and heating the semiconductor wafer to about 150 ° C.
- An unloading device for storing a wafer in the second storage container, and a transfer device for transferring the wafer from the loading device to the bonding stage and from the bonding stage to the unloading device are provided.
- the bonding between the electrode portions and the bumps on the piezoelectric substrate or the semiconductor substrate on which the minute bumps are formed may be incomplete. That is, as shown in FIG. 45, the S AW filter 10 has a pair of comb-shaped input circuits 12 and output circuits 13 on a piezoelectric substrate 11. The vibration generated by the input side circuit 12 is propagated to the output side circuit 13, and an output based on the propagated vibration is output from the output side circuit 13.
- S AW Surface Acoustic Wave
- the SAW filter 10 allows only a signal of a specific frequency to pass. Due to the structure and function of the S AW filter 10, the comb-shaped input-side circuit 12 and the output-side circuit 13 of the circuit forming portion and the electrode portions of these circuits 12 and 13 are formed.
- the film thickness is about 200 OA, for example, compared to the film thickness of the electrode portion formed on a normal semiconductor substrate made of Si is about 500 to 700 A. And thin. Accordingly, it is considered that the bonding between the bump and the electrode portion may be incomplete because the layer of the metal material forming the electrode portion, for example, the layer made of aluminum particles is thin.
- the diameter 16 b of the pedestal portion 16 a of the bump 16 formed on the electrode portion 15 is about 4 ° to 48 °.
- the pedestal diameter is about 80 // m in the normal case, but the size of the bump 16 itself is smaller than that in the normal case. Therefore, the bonding area between the bump 16 and the electrode portion 15 is small, and the bonding is often incomplete.
- an electrode of a semiconductor chip cut out from a semiconductor wafer and an electrode portion on a circuit board are opposed to each other without using a wire.
- the semiconductor wafer and the semiconductor chip are heated while the bumps made of gold or the like are formed on the electrode 51 of the semiconductor wafer or the semiconductor chip as shown in FIG. 5 2 is formed.
- the semiconductor chip itself is also miniaturized, and the heat-resistant temperature of the semiconductor chip tends to decrease. Therefore, there is a demand for a reduction in the heating temperature during bump formation.
- the present invention has been made to solve the above-described problems, and is a bump capable of improving the bonding strength between a bump formed on an electrode portion and an electrode as compared with the related art.
- An object of the present invention is to provide a pump forming apparatus and a bump forming method, and more specifically, to the following.
- the present invention provides a bump forming apparatus, a bump forming method executed by the bump forming apparatus, which can stabilize a bonding state between an electrode portion and a bump and can improve a bonding strength as compared with the related art.
- a first object is to provide a computer-readable recording medium on which a program capable of executing a bump forming method is recorded, and a bump-formed semiconductor substrate on which bumps are formed.
- the present invention provides a method of manufacturing a semiconductor device, comprising: reducing the bonding strength between a bump formed on an electrode of a semiconductor component and the electrode;
- a second object is to provide a bump strength improving device and method, and a bump forming device capable of improving the quality as compared with the conventional one. Disclosure of the invention
- the bump forming apparatus includes: a bump forming device for forming a bump on an electrode portion on a semiconductor substrate; A bump forming apparatus having a bump forming head for forming the bump,
- a preheat apparatus for executing a pre-formation bonding promotion temperature control for promoting bonding between the electrode portion and the bump during bump formation on the semiconductor substrate before forming the bump on the electrode portion.
- the pre-formation bonding promotion temperature control of the preheating device is performed by heating the semiconductor substrate to a pre-formation bonding promotion temperature (T 1) that is equal to or higher than the bump bonding temperature and equal to or less than the damage prevention temperature (TB) of the semiconductor substrate. May be.
- the pre-formation bonding promotion temperature control of the preheating device further includes maintaining the semiconductor substrate at the pre-formation bonding promotion temperature (tl) at the pre-formation bonding promotion temperature, and elapsing the pre-formation bonding promotion time Later, it may be set to the above bump bonding temperature.
- the temperature control for promoting bonding before formation of the preheating device may further include setting the temperature for promoting bonding before forming and the time for promoting bonding before forming based on the material of the electrode portion and the bumps. .
- the pre-formation bonding promotion temperature control of the preheating device further includes setting the pre-formation bonding promotion temperature and the pre-formation bonding promotion time based on the thickness of the electrode portion and the diameter of the pedestal portion of the bump. May be.
- the pre-formation bonding promoting temperature may be a temperature obtained by adding 30 to 60 ° C. to the bump bonding temperature.
- the time for promoting the bonding before the formation can be 10 minutes to 30 minutes.
- the semiconductor substrate is further provided with a post-heat device that performs post-formation bonding promotion temperature control for promoting bonding between the bumps and the electrode portions and the bumps. It may be configured as follows.
- the post-formation bonding promotion temperature control of the post-heater is performed by heating the semiconductor substrate to a post-formation bonding promotion temperature (T 3) that is equal to or higher than the bump bonding temperature and equal to or lower than the damage prevention temperature of the semiconductor substrate. Good.
- the post-formation bonding promotion temperature control of the post-heat device further includes maintaining the semiconductor substrate at the post-formation bonding promotion temperature (t 3) at the post-formation bonding promotion temperature, After a lapse of time, the temperature may be lowered.
- the apparatus further comprises a control device for controlling the preheating device and the boast heating device by associating the pre-formation bonding promotion temperature control by the preheating device and the post-formation bonding promotion temperature control by the boast heating device with each other.
- a control device for controlling the preheating device and the boast heating device by associating the pre-formation bonding promotion temperature control by the preheating device and the post-formation bonding promotion temperature control by the boast heating device with each other.
- the method for forming a bump includes the steps of: forming the electrode portion on the semiconductor substrate at a bump bonding temperature (T 2) when forming a bump on the electrode portion on the semiconductor substrate; A bump forming method for forming the bumps on the semiconductor substrate before the bumps are formed on the electrode portions, wherein the bonding between the electrode portions and the bumps is promoted on the semiconductor substrate at the time of forming the bumps. Execute temperature control.
- the temperature control for bonding promotion before the formation may be such that the bump The semiconductor substrate is heated to a bonding promoting temperature (T 1) before forming the semiconductor substrate at a bonding temperature equal to or higher than the bonding temperature and equal to or lower than the damage prevention temperature (TB) of the semiconductor substrate.
- T 1 bonding promoting temperature
- the semiconductor substrate may be maintained at the time (t 1), and the bump bonding temperature may be set after the elapse of the pre-formation bonding promoting time.
- a post-formation bonding promoting temperature control for promoting the bonding between the electrode portion and the bump after the bump formation is performed on the semiconductor substrate. May be performed.
- the post-formation bonding promotion temperature control includes heating the semiconductor substrate to a post-formation bonding promotion temperature (T 3) that is equal to or higher than the bump bonding temperature and equal to or lower than the damage prevention temperature of the semiconductor substrate.
- the semiconductor substrate may be maintained at the post-formation bonding promotion time (t 3) at the post-formation bonding promotion temperature, and the temperature may be lowered after the post-formation bonding promotion time has elapsed.
- the temperature control for promoting bonding before forming and the temperature control for promoting bonding after forming may be controlled in association with each other.
- the recording medium is provided on the electrode portion on the semiconductor substrate at a temperature (T 2) for bump bonding when forming a bump on the electrode portion.
- T 2 a temperature for bump bonding when forming a bump on the electrode portion.
- a computer-readable recording medium recording a program for executing a bump forming method for forming
- the semiconductor substrate was recorded with a process of performing a pre-formation bonding promotion temperature control for promoting the bonding between the electrode portions and the bumps during the formation of the bumps.
- the bumps were formed on the semiconductor substrate according to the fourth aspect of the present invention by the bump forming apparatus according to the first aspect.
- the semiconductor substrate has a bonding strength between the bump formed on the electrode portion and the electrode portion, the bump having a strength to be broken at a pedestal portion of the bump.
- the bump having a base portion of the bump formed on the electrode portion having a diameter of approximately 90 ⁇ has a breaking force of approximately 680 to 80 OmN per bump. I do.
- the pre-heating apparatus is provided, and before the formation of the bump on the electrode portion, the temperature control for bonding promotion before formation is performed on the semiconductor substrate. I did it. Therefore, before the bump is formed, the metal particles in the electrode portion can be changed to an appropriate state, and the bonding state between the electrode portion and the bump can be improved as compared with the conventional case. Therefore, the bonding strength between the electrode portion and the bump can be improved to such an extent that the bonding portion between the electrode portion and the bump breaks at the pedestal portion of the bump, not at the bonding interface portion.
- the temperature control for promoting bonding before formation is performed by heating the electrode portion to a temperature for promoting bonding before forming, and further maintaining the temperature for promoting bonding before forming at the temperature for promoting bonding before forming. Done.
- the metal crystal in the electrode portion it is possible to optimize the metal crystal in the electrode portion and to obtain a complete bonding state of the bump.
- the most suitable bonding state corresponding to various bumps is set. Can be obtained.
- the bonding promoting temperature before formation a temperature obtained by adding 30 to 60 ° C. to the temperature for bump bonding can improve the tact time of the bump forming operation. Also, the bonding promoting time before formation at this time is preferably 10 to 30 minutes.
- a post-heating device may be provided in addition to the preheating device, and after the bump is formed on the electrode portion, the temperature control for bonding promotion after the formation on the semiconductor substrate may be executed.
- the bonding promotion temperature control after the formation By performing the bonding promotion temperature control after the formation, the bonding strength between the bump formed on the electrode portion and the electrode portion can be further improved as compared with the case where only the preheating operation is performed.
- a control device can be provided.
- the above-mentioned temperature control for promoting bonding before formation and the temperature control for promoting bonding after formation can be controlled in association with each other, and the type and size of the semiconductor substrate and the material of the electrode portion can be controlled.
- the bump Based on the thickness and size, the material and size of the bump, etc., the bump can be more easily bonded to the electrode part, and the bonding strength between the pump and the electrode part can be further improved.
- the program for executing at least the above-described pre-formation bonding promotion temperature control is recorded, so that the pre-formation bonding promotion can be easily performed on a plurality of bump forming apparatuses. Temperature control can be executed.
- the semiconductor substrate of the above-described fourth aspect it is possible to form a bump on an electrode portion by a bump forming apparatus having at least a preheating apparatus for performing the above-described pre-formation promoting temperature control. It is possible to provide a semiconductor substrate in which the bonding strength between the bump and the electrode portion is improved as compared with the related art. Therefore, even when such a semiconductor substrate is flip-chip mounted, the bump does not come off the electrode portion at the junction interface between the bump and the electrode portion, and the reliability of flip-chip mounting can be improved.
- the present invention is configured as follows to achieve the second object.
- the bump strength improving apparatus is a device for improving the strength of a bump in which a bump is formed on an electrode of a semiconductor component, in comparison with the bonding strength between the electrode and the bump when the bump is formed.
- a controller that controls the heating device to perform heating control based on the bonding strength improvement conditions.
- the bonding strength improvement condition is a condition in which the heating time and the heating temperature for obtaining the desired bonding strength and the heating temperature are variables.
- the control device is configured to determine the material of the semiconductor component, the size of the semiconductor component, For at least one of the material of the electrode, the size of the electrode, the material of the bump, and the size of the bump, the information is formed from information on a relationship between a heating temperature and a heating time required to reach the desired bonding strength. There is a bonding strength improvement condition, and the heating control of the heating device can be performed based on the bonding strength improvement condition.
- the bonding strength improvement conditions of the control device are as follows: the material and size of the semiconductor component, the material and size of the electrode, and the material and size of the bumps are at least one thread, or a combination of each set. May be relational information between the heating temperature and the heating time required to reach the desired bonding strength.
- the semiconductor component may be a chip component cut from a semiconductor wafer.
- the heating device may include a plurality of heat treatment units each for mounting at least one of the chip components.
- the control device can independently perform the temperature control according to the elapsed time after the formation of the pump in each of the chip components provided in each of the heat processing units.
- the heating device may be a bonding stage for forming a bump on the semiconductor component, a bump leveling stage for equalizing the bump height of the bump-formed component, or a bump-formed component for storing the bump-formed component. It can be provided in any of the parts.
- the control device When the semiconductor component is a semiconductor wafer, the control device performs the bonding strength improvement condition on the basis of the bump formation time (TE-TS) required to form almost all bumps on the semiconductor wafer. , And the heating control of the heating device can be performed under the determined bonding strength improvement conditions.
- TE-TS bump formation time
- the above-mentioned bonding strength improvement condition is the first heating time to obtain the above-mentioned bonding strength target value (P 0). (TB) to heat the semiconductor wafer.
- the above-mentioned bonding strength improvement condition is the second heating obtained by subtracting the above-mentioned appropriate heating time from the above-mentioned bump formation time.
- the semiconductor wafer can be heated for a time (TA).
- the heating device has a plurality of heat treatment units corresponding to the order of bump formation on the semiconductor wafer on which the semiconductor wafer is placed, and the control device independently performs each of the heat treatment units with respect to the heat treatment units.
- the temperature can be controlled according to the elapsed time after the bump is formed on the semiconductor wafer corresponding to the portion.
- a bump forming apparatus includes: a bump strength improving apparatus according to the fifth aspect; a bump forming unit that mounts and heats a semiconductor component to form a bump on an electrode of the semiconductor component; With.
- the control device provided in the bump strength improving device further controls the temperature of the bump forming unit so as not to cause damage to the semiconductor component when forming the bump in the bump forming unit. Heating control can be performed on the heating device based on the bonding strength improving condition at a temperature exceeding the undamaged temperature.
- a method for improving bump strength according to a seventh aspect of the present invention comprises: loading a bump-formed component having a bump formed on an electrode of a semiconductor component;
- the heating control is performed on the bump-formed component based on a bonding strength improvement condition for improving the bonding strength compared to the bonding strength between the electrode and the bump at the time of bump formation.
- the bonding strength improvement condition is a condition in which the heating time and the heating temperature for obtaining the desired bonding strength are variables, and the material of the semiconductor component, the size of the semiconductor component, the material of the electrode, At least one of the size of the electrode, the material of the bump, and the size of the bump is a condition consisting of information on the relationship between the heating temperature and the heating time for achieving the desired bonding strength, and the relationship information.
- the heating control can be performed based on the above.
- the bonding strength improvement conditions are as follows: at least one set of the material and size of the semiconductor component, the material and size of the electrode, and the material and size of the bump, or the combination of each set; Is a condition consisting of information on the relationship between the heating temperature and the calorie heating time to reach the heating temperature, and the heating control can be performed based on the relationship information.
- the temperature of the bump forming portion where the pump is formed is controlled to a non-damage temperature at which the semiconductor component is not damaged
- heating control based on the bonding strength improving condition at a temperature exceeding the undamaged temperature can be performed.
- the above-mentioned bonding strength improvement condition is obtained, and the above-mentioned heating control is performed under the obtained bonding strength improvement condition Can be.
- the above-mentioned bonding strength improvement condition is the first heating time to obtain the above-mentioned bonding strength target value (P 0).
- (TB) can be calorific heat.
- the above-mentioned bonding strength improvement condition is the second heating obtained by subtracting the above-mentioned appropriate heating time from the above-mentioned bump formation time. Heating by time (YA) is easier.
- the heating device and the control device are provided.
- the semiconductor component is heated under the bonding strength improving condition for improving the bonding strength. Therefore, when the bumps are formed, even if the bonding strength at each bump of the semiconductor component is not uniform in the semiconductor component, it can be made substantially uniform by performing the heating under the bonding strength improvement conditions. . Therefore, the quality of the semiconductor component can be improved as compared with the related art. It is also useful for securing the bonding strength of weak heat resistant components.
- the bonding strength improving condition is a condition using the heating time and the heating temperature as variables, and can be changed depending on, for example, the material and size of the semiconductor component. Therefore, for example, if the temperature for forming a bump is relatively high during the formation of the bump, the temperature for forming the bump is set to a relatively low temperature for a semiconductor component that is physically damaged due to its material. By heating the semiconductor component at a relatively low temperature for a long time even under the above-described bonding strength improvement conditions, the bonding strength can be made substantially uniform, and the quality of the semiconductor component can be improved as compared with the related art.
- heating device by configuring the heating device so that a plurality of semiconductor components can be placed thereon, heating under the above-described bonding strength improvement conditions and other operations can be performed in parallel, thereby improving tact time. it can.
- the time from the start to the end of the bump formation is longer than when the semiconductor component is a semiconductor chip.
- Improvement of bonding strength by heating after bump formation The above-described bonding improvement condition can be determined based on the relationship with the appropriate heating time at which good is obtained. By determining the bonding improvement conditions in this way, the bonding strength of all the bumps on the semiconductor wafer can be made substantially uniform, and the quality of the bumped semiconductor wafer can be improved as compared with the conventional case.
- FIG. 1 is a perspective view showing an overall configuration of a bump forming apparatus according to a first embodiment of the present invention
- FIG. 2 is a perspective view showing a detailed structure of a main part of the bump forming apparatus shown in FIG. 1,
- FIG. 3 is a view showing the structure of the bump bonding apparatus shown in FIG. 1
- FIG. 4 is a view showing the contact between the bump bonding apparatus and the charge generating semiconductor substrate in the pre-heating apparatus, the post-heating apparatus, and the bonding stage shown in FIGS. It is a diagram of a state where silver plating has been applied to the surface,
- FIG. 5 is a perspective view showing details of the configuration of the carry-in device shown in FIGS. 1 and 2, and FIG. 6 is a diagram for explaining the operation in step 8 shown in FIG.
- FIG. 4 is a diagram showing a state in which the wafer after bump formation held by the loading device is arranged above the unloading device,
- FIG. 7 is a perspective view showing details of the configuration of the orientation flat aligner shown in FIGS. 1 and 2.
- FIG. 8 is a perspective view showing the details of the configuration of the transfer device shown in FIGS. 1 and 2
- FIG. 9 is a modified example of the loading-side transfer device and the unloading-side transfer device shown in FIGS. 1 and 2.
- FIG. 8 is a perspective view showing the details of the configuration of the transfer device shown in FIGS. 1 and 2
- FIG. 9 is a modified example of the loading-side transfer device and the unloading-side transfer device shown in FIGS. 1 and 2.
- FIG. 9 is a modified example of the loading-side transfer device and the unloading-side transfer device shown in FIGS. 1 and 2.
- FIG. 10 is a diagram showing details of the configuration of a contact member for static elimination of the wafer holding unit shown in FIG. 8;
- FIG. 11 is a perspective view of a preheating device and a boast heating device
- FIG. 12 is a diagram for explaining the operation of the pre-heating device and the post-heating device shown in FIG. FIG.
- FIG. 13 is a diagram for explaining the operation of the pre-heating device and the post-heating device shown in FIG. 11,
- FIG. 14 is a perspective view of an aluminum plate and a heater plate frame of the pre-heating device and the post-heating device shown in FIG. 11,
- FIG. 15 is a diagram showing the metal particles on the surface in the vicinity of the bump formation location before performing the temperature control for bonding promotion before formation.
- FIG. 16 is a diagram showing the metal particles on the surface in the vicinity of the bump formation location after performing the temperature control for bonding promotion before formation.
- FIG. 17 is a flowchart showing the operation of the bump forming apparatus shown in FIG. 1.
- FIG. 18 is a view for explaining the operation in step 2 shown in FIG. It is a diagram showing a state where is raised,
- FIG. 19 is a diagram for explaining the operation in step 2 shown in FIG. 17 and is a diagram showing a state immediately before the wafer is held by the loading-side transfer device,
- FIG. 20 is a diagram for explaining the operation in step 2 shown in FIG. 17 and is a diagram showing a state immediately after the wafer is held by the loading-side transfer device,
- FIG. 21 is a diagram for explaining the operation in step 2 shown in FIG. 17 and is a diagram showing a state where the wafer is held by the loading-side transfer device;
- FIG. 22 is a flowchart of a preheating operation in the preheating apparatus provided in the bump forming apparatus shown in FIG.
- FIG. 23 is a flowchart for explaining the transfer operation from the preheating device to the bump bonding device in Step 5 shown in FIG. 17, and shows the operation when the panel heater frame and the aluminum plate are separated.
- FIG. 24 is a flowchart for explaining the operation in step 3 shown in FIG. 17, and is a diagram showing a state in which the wafer before bump formation is transported above the preheating apparatus.
- FIG. 5 is an enlarged view of a portion III shown in FIG. 26,
- FIG. 26 is a graph showing the temperature change of the semiconductor substrate in the bonding promotion temperature control before formation and the bonding promotion temperature control after formation performed in the bump forming apparatus shown in FIG.
- FIG. 27 is a view for explaining the operation in step 3 shown in FIG. 17 and is a view showing a state where the wafer before bump formation is placed on an aluminum plate,
- FIG. 28 is a diagram for explaining the operation in step 3 shown in FIG. 17 and is a diagram showing a state in which the holding of the wafer before bump formation by the wafer holding unit is released.
- FIG. 17 is a view for explaining the operation in step 3 shown in FIG. 17, showing a state in which the aluminum plate on which the wafer before bump formation is placed is lowered
- FIG. 30 is a view showing the state formed in the electrode portion.
- FIG. 5 is a diagram for explaining a method for measuring the shearing force of a bump
- FIG. 31 is a graph showing a change in the temperature of the semiconductor substrate in the bonding promotion temperature control before formation and the bonding promotion temperature control after formation performed in the bump forming apparatus shown in FIG. It is a graph showing a modification
- FIG. 32 is a flowchart for explaining the transfer operation of the wafer before bump formation to the bump bonding stage in step 5 shown in FIG. 17, and FIG. 33 is an operation in step 5 shown in FIG.
- FIG. 7 is a diagram for explaining a state in which a wafer before bump formation is arranged above a bonding stage;
- FIG. 34 is a diagram for explaining the operation in step 5 shown in FIG. 17 and is a diagram showing a state immediately before holding the wafer at the bonding stage.
- FIG. 35 is a view for explaining the operation in step 5 shown in FIG. 17 and is a view showing a state where the wafer is held by the bonding stage and the loading side transfer device releases the holding of the wafer.
- FIG. 36 is a diagram for explaining the operation in step 5 shown in FIG. 17 and is a diagram showing a state where the wafer is held on the bonding stage.
- FIG. 37 is a flowchart of the post-heating operation in the post-heating apparatus provided in the bump forming apparatus shown in FIG.
- FIG. 38 is a diagram for explaining a correlation between the bonding promoting temperature after formation and the holding time of the temperature in the post-heating operation.
- FIG. 39 is an enlarged view of the portion IV shown in FIG. 26,
- FIG. 40 is a diagram for explaining the operation in step 8 shown in FIG.
- FIG. 41 is a diagram showing a state in which the holding unit of the unloading device is brought into contact with the wafer after bump formation.
- FIG. 41 is a diagram for explaining the operation in step 8 shown in FIG.
- FIG. 42 is a diagram illustrating the state immediately after the holding of the wafer by the holding device is released.
- FIG. 42 is a diagram for explaining the operation in step 8 shown in FIG.
- FIG. 4 is a diagram showing a state immediately after mounting the wafer on a holding table
- FIG. 43 is a view for explaining the operation in step 8 shown in FIG. 17 and is a view showing a state where the wafer after the bump formation is placed on a holding table;
- FIG. 44 is a diagram showing a state where ions are applied to the wafer by the ion generator when the wafer is transferred from the unloading-side transfer device shown in FIG. 1 to the unloading device after bump formation.
- FIG. 45 is a perspective view showing the structure of the SAW filter.
- FIG. 46 is a diagram showing a state in which bumps are formed on the electrode portions.
- FIG. 47 is a perspective view of a bump forming apparatus according to a second embodiment of the present invention.
- FIG. 48 is an enlarged perspective view of the semiconductor chip transfer device shown in FIG. 47
- FIG. 49 is an enlarged perspective view of the bonding stage shown in FIG.
- FIG. 50 is an enlarged perspective view of the bump forming portion shown in FIG. 47.
- FIG. 51 is an enlarged perspective view of the leveling device shown in FIG.
- Figure 52 is a graph showing the relationship between the bonding time between the bump and the electrode and the heating time for each heating temperature.
- FIG. 53 is a graph showing the relationship between the bump forming temperature and the bonding strength of the bump.
- FIG. 54 is a graph showing the relationship between the heating time and the heating temperature for the above bonding strength.
- FIG. 55 is a perspective view of a modification of the repeller device shown in FIG. 47
- FIG. 56 is a perspective view of a modification of the finished product storage device shown in FIG. 47
- FIG. FIG. 48 is a layout view of a modification of the bump forming apparatus shown in FIG.
- FIG. 58 is a view showing a modification of the bump forming apparatus shown in FIG. 47, in which the heating stage is divided into a plurality of sections to enable temperature control for each section. Yes,
- FIG. 59 is a diagram showing the bump formation order when the processing target is a semiconductor wafer.
- FIG. 60 is a graph for explaining an example of a method of obtaining a bonding strength improvement condition when a processing target is a semiconductor wafer, and is a graph showing a relationship between the bonding strength and a heating time after bump formation. ,
- FIG. 61 is a flowchart showing how to obtain the above-mentioned bonding strength improvement conditions with reference to FIG. 60.
- FIG. 62 shows a modification of the bump forming apparatus shown in FIG. 47, in which when a processing target is a semiconductor wafer, the heating stage is divided into a plurality of sections to enable temperature control for each section. It is a diagram showing a heating stage,
- FIG. 63 is a view showing a shape of a bump formed on an electrode.
- a bump forming apparatus according to an embodiment of the present invention, a bump forming method executed by the bump forming apparatus, a recording medium readable by a computer recording a program for executing the bump forming method, and the bump forming method
- the semiconductor substrate on which the bumps are formed by the apparatus will be described below with reference to the drawings. In each figure, the same components are denoted by the same reference numerals.
- the bump forming apparatus 101 of the present embodiment shown in FIGS. 1 and 2 is used for processing a wafer-shaped piezoelectric substrate (hereinafter, referred to as a “piezoelectric substrate wafer”) for forming the SAW filter. It is suitable, and the following description also exemplifies a case where bumps 16 are formed on the electrode portions 15 of the circuit portion formed on the piezoelectric substrate wafer as shown in FIG.
- the electrode portion 15 formed on the piezoelectric substrate wafer has aluminum as its main component, and its thickness 15a is about 200 OA.
- the bumps 16 formed on the electrode portions 15 are made of gold and have a diameter of about 90 to 120 im in the diameter of the pedestal portion 16a.
- the present embodiment does not limit the processing target to such a piezoelectric substrate wafer. That is, the substrate to be processed is a substrate in which the bonding state between the electrode portion and the bump formed on the electrode portion is unstable and the bonding strength is weaker than a normal value.
- the substrate to be processed is a substrate in which the bonding state between the electrode portion and the bump formed on the electrode portion is unstable and the bonding strength is weaker than a normal value.
- Semiconductor wafers and semiconductor chips on which the so-called minute bumps are formed are to be processed.
- the thin electrode portion 15 refers to an electrode portion having a thickness of about 250 OA or less and a thickness of, for example, about 180 to 220 OA.
- the above-mentioned minute bump refers to a bump having a size of about 50 ⁇ m or less
- the material of the base material constituting the semiconductor wafer and the semiconductor chip is made of a compound semiconductor such as LiTaO3 or LiNbO3 when forming the SAW filter, as well as quartz or Sb. i, etc., and are not particularly limited.
- the bump forming apparatus 101 includes a first storage container 205 in which the piezoelectric substrate wafer 201 before bump formation is stored in a layer and a piezoelectric substrate wafer 202 after bump formation in a layer. It is a so-called double-magazine type having both the second storage container 206 to be stored, but is not limited to this type. The piezoelectric substrate wafer 201 before bump formation and the bump formation are not limited to this type. A so-called single-magazine type in which the rear piezoelectric substrate wafer 202 is stored in one storage container may be used.
- the bump forming apparatus 101 is roughly divided into one bonding stage 110, one bump forming head 120, a transport device 130, and a loading side and a loading side.
- the provided transfer device 140, the storage containers 205, 206 are provided respectively, and the lifting device 150 for raising and lowering the storage containers 205, 206 respectively, and the preheating device 16.
- a post-heat device 170, and a control device 180 As described in detail below, the bump forming apparatus 101 of the present embodiment is characterized in that the temperature of the substrate is controlled by the preheating apparatus 160 before the bumps are formed on the electrode portions. Therefore, the most basic components are the bump forming head 120 for forming a bump and the preheating device 160.
- each of the above components will be described.
- the bonding stage 110 places the piezoelectric substrate wafer before bump formation (hereinafter simply referred to as “wafer before bump formation”) 201 and forms the wafer on the wafer 201 before bump formation.
- the bump bonding temperature required for forming the bump is a temperature required for bonding the electrode portion 15 and the bump 16 with the designed strength, and the bump 16 is formed.
- the temperature is set in accordance with the material of the wafer or substrate to be manufactured and the strength in the above design. In the case of the present embodiment, it is about 150 ° C.
- the wafer 201 before the bump formation is adsorbed on the wafer mounting table 111 on which the wafer 201 before the bump formation is mounted, and An inlet / outlet 1 13 for ejecting gas is opened, and the inlet / outlet 1 13 functions as a suction device 114 controlled by a control device 180 and a gas supply device.
- a blow device 1 15 which is an example of the operation is connected.
- the gas is air.
- the wafer mounting table 1 1 1 of the bonding stage 110 is used to transfer the heating position in contact with the heater 1 12 side and the semiconductor substrate such as the wafer 201 before bump formation. Can be moved up and down with the lifting device between the transfer positions. As shown in FIG.
- a metal plating in this embodiment, a silver plating 261 is applied to the contact surface of the wafer mounting table 111 with the wafer 201 before bump formation.
- a silver plating 261 is applied to the contact surface of the wafer mounting table 111 with the wafer 201 before bump formation.
- the bump forming head 120 is placed on the bonding stage 110 and the bump 16 is formed on the electrode portion 15 of the wafer before bump formation 201 maintained at the bump bonding temperature.
- a wire supply unit 121 for supplying a gold wire used as a material for the bump 16 the above-described gold wire is melted to form a ball and the ball is melted.
- It has a bump producing section for pressing the ball against the electrode portion 15, an ultrasonic generating section for applying ultrasonic waves to the bump 16 at the time of pressing.
- the bump forming head 120 thus configured has, for example, a ball screw structure and a flat shape.
- the X and Y tables 122 which are movable in the X and Y directions perpendicular to each other on the surface, are mounted on the X and Y tables 122.
- the table is moved in the X and Y directions by the X and Y tables 122 so that 16 can be formed.
- the loading device 131 is a device for taking out the wafer before bump formation 201 from the first storage container 205
- the unloading device 132 is a bumper.
- This is a device that transports and stores the formed piezoelectric substrate wafer (hereinafter simply referred to as “wafer after bump formation”) 202 to the second storage container 206.
- the carry-in device 13 1 includes a holder 1311 for holding the wafer before bump formation 201 by suction operation, and a holder 1311 along the X direction. And a moving device 1 3 1 2 for the loading device to be moved.
- the driving unit 1313 included in the loading device moving device 1312 is connected to the control device 180 to control the operation. Therefore, the holder 1 3 1 1 is moved along the X direction by the operation of the driving unit 1 3 1 3, and the loading device 1 3 1 is moved from the first storage container 2 5 Take out one.
- the unloading device 13 2 has the same structure as the loading device 13 1, and operates in the same manner. In other words, as shown in FIG.
- the unloading device 132 includes a holding table 1321 that holds the wafer 202 by the suction operation after the bumps are formed, and a holding table 1312, A moving device 1 32 for the unloading device that moves along the X direction to store the wafer 202 after the bump formation in the second storage container 206, and a back surface 2 of the wafer 202 after the bump formation.
- Holder 1 3 2 3 that holds wafer 2 0 2 after it is attracted to 0 2 b and bumps are formed, and bumps are placed below holder 1 3 2 1 and held by holder 1 3 2 1
- a driving unit 1324 for moving the holding unit 1323 in the thickness direction of the rear wafer 202.
- the operation of the moving device 1 3 2 2 and the driving unit 1 3 2 4 for the unloading device is controlled by a control device 180.
- an orientation flat aligning device for orienting the orientation flat of the pre-bump-formed wafer 201 taken out of the first storage container 205 by the import device 131 in the installation location of the import device 131 is used. 1 3 3 is provided. As shown in FIG. 7, the orientation flat aligning device 1 33 is moved in the Y direction by a driving section 133 2. The holding plate 1 3 3 1 for holding the wafer before bump formation 201 and the wafer 201 before bump formation can be moved in the thickness direction, and the wafer 201 before bump formation can be held and held.
- Holder 1 3 3 3 rotatable in the circumferential direction of pre-bump formation wafer 201 in order to perform orientation flat of pre-bump formation wafer 201 1, and drive unit 1 of holder 1 3 3 3 3 3 and 4 are provided.
- the operation of 3 3 4 is controlled by the control device 180.
- the transfer device 140 includes a carry-in transfer device 141 and a carry-out transfer device 142 in the bump forming device 101.
- the loading-side transfer device 1 4 1 1 sandwiches the wafer before bump formation 2 1 held by the holding table 1 3 1 1 of the loading device 1 3 1 and transports it to the pre-heating device 1 60, The transfer from the preheating device 160 to the bonding stage 110 is performed.
- the unloading-side transfer device 144 holds the wafer 202 after the bump formation held on the bonding stage 110 and transports it to the post-heater 170 and the post-heater 1 From 70, transfer to the holding table 1 32 1 of the above unloading device 1 32 is performed.
- the wafer holding unit 1441 which holds the substrate 201 and removes the charge on the front and back surfaces of the wafer 201 before bump formation, and the wafer holding unit 1441, which is driven for the above-described holding operation
- the driving unit 1412 having an air cylinder, and the entire wafer holding unit 1411 and the driving unit 1412 are moved in the X direction.
- a ball screw mechanism is used.
- a moving device 1 4 1 3 to be configured.
- the driving unit 1412 and the moving device 1413 are connected to a control device 180, and their operations are controlled.
- the unloading-side transfer device 14 like the transfer-side transfer device 14 1, also includes a wafer holding unit 14 2 1, a driving unit 1 4 2 2, and a moving device 1 4 2 3, The operation of the drive unit 1442 and the moving device 1442 is controlled by the control device 180.
- 1 is a first holding member 14 14 and a second holding member 14 15 that are movable in the X direction by the driving unit 14
- the static elimination units # 1 4 16 arranged are arranged in parallel with each other.
- the first holding member 14 14, the second holding member 14 15, and the static elimination member 14 16 are made of iron or other conductive material. Made from materials.
- the wafer holding unit 1421 also includes a first holding member 1424 and a second holding member 1425, and a static elimination member 1426 sandwiched therebetween and arranged in parallel with each other. Have been.
- the first holding member 1424, the second holding member 1425, and the charge removing member 1426 are all made of iron or another conductive material. Since the wafer holders 141 1 and 142 1 have the same structure, the wafer holder 141 1 will be described below as an example.
- Each of the first holding member 1414 and the second holding member 1415 has an L-shaped holding claw 141 7 made of iron or a conductive resin material for holding the wafer 201 before bump formation as shown in the figure. Two are provided.
- the first holding member 1414, the second holding member 1415, and the holding claws 14 17 are made of iron or a conductive material because the back surface 201 b of the wafer 201 before bump formation to be held is charged. This is to enable grounding.
- the static elimination member 1416 is provided with a wafer 20 1 c so as to be able to contact the peripheral portion 201 c of the front surface 2 O la of the pre-bump forming wafer 201 held by the wafer holding portion 14 11.
- a contact member 141 61 for static elimination is provided to protrude in the thickness direction of the wafer 201 at two locations along the diameter direction of 1.
- the static elimination contact member 1 416 1 is slidably penetrated and attached to the static elimination member 14 16 as shown in FIG. 10, and a spring 14 16 2 is provided in the axial direction of the static elimination contact member 14 16 1. It is energized by
- a conductive resin 14163 is provided as a cushioning material at the wafer contact end of the contact member 14 16 for static elimination.
- the charge removing contact member 14161 grounds the charge on the surface 201a. Further, before the wafer 201 before bump formation is held by the holding claws 141 7, the contact member 141 61 for static elimination is at the same level as the holding claws 141 7 in the thickness direction of the wafer 201 before bump formation. Or beyond the holding claw 141 7 It is protruding. With this configuration, when the wafer holding unit 1411 is to hold the pre-bump formation 0: 201, before the holding claws 1417 are in contact with the pre-bump formation wafer 201, the contact for static elimination is made.
- the member 14 16 1 can be brought into contact with the surface 20 la of the wafer 201 before bump formation. Therefore, first, the surface 201a can be neutralized. Also, a configuration in which a ground wire is directly connected to the contact member for static elimination 14 16 1 may be adopted.
- the preheating device 160 is a device that executes one of the characteristic operations in the bump forming device 101 of the present embodiment. That is, before the bump 16 is formed on the electrode portion 15 of the wafer before bump formation 201, the preheating device 160, before forming the bump 16 on the electrode portion 15 of the wafer before bump formation 201, contacts the above-mentioned electrode portion when the bump is formed.
- This is a device for performing pre-formation bonding promotion temperature control for promoting bonding between the bumps 15 and the bumps 16, and is roughly divided into a pre-heating unit that heats the wafers before bump formation 201, And a controller for performing the above-described pre-formation bonding promotion temperature control.
- the control unit corresponds to the control device 180.
- the preheating unit is configured as follows.
- a 6 mm-thick aluminum plate 1 in this embodiment as a heat diffusion member is provided on a panel heater frame 162 having a panel heater 161 as a heat source. 6 3 is placed.
- a metal plating in this embodiment, a silver plating 261 is applied to the wafer mounting surface 1663a of the aluminum plate 163.
- the temperature raising operation by the panel heater 161 is controlled by the controller 180 while measuring the temperature of the aluminum plate 163 with reference to temperature information from a temperature sensor 166 such as a thermocouple.
- the material of the heat diffusion member 163 is not limited to the above-described aluminum, and is a material having a good thermal conductivity and not causing a chemical reaction with the wafer 201 before bump formation. For example, duralumin may be used.
- the carry-in side transfer device 14 1 and the carry-out side transfer device 14 2 each hold the wafer holding unit 14 11 1, the ueno, and the holding unit 14 21.
- the preheater 160 mounts the panel heater frame 162 having the panel heater 161 and the aluminum plate 16 so that the wafer 201 before bump formation is placed on the aluminum plate 163.
- An elevating mechanism is provided for raising and lowering 3 in the above-described thickness direction between the lowering position 1667 shown in FIG. 12 and the raising position 1668 shown in FIG.
- the elevating mechanism includes an air cylinder 1601 as a driving source for performing the elevating operation in the thickness direction, and a T-shaped support member 160 raised and lowered by the air cylinder 1601. 2 and two support rods 1603 standing upright on the support member 1602 and supporting the panel heater frame 162 and the aluminum plate 163.
- the air cylinder 1601 is operated by a cylinder driving device 164, the operation of which is controlled by a control device 180.
- the panel heater frame 162 and the aluminum plate 163 are separated from each other by the lifting and lowering operation by the air cylinder 1601, as described later, so that the cooling of the aluminum plate 163 is promoted.
- the cylinder driving device 1604 and the air cylinder 1601 have a function as a separating device.
- the support bar 1603 penetrates the panel heater frame 162, and its tip is inserted into the aluminum plate 163.
- the panel heater frame 16 2 can slide in the axial direction of the support bar 16 03, and the aluminum plate 16 at the tip of the support bar 16 03. 3 is fixed to the support bar 16 03.
- the panel heater frame 162 is pressed against the arm / remdium plate 1663 by a spring 1605 which is an example of the urging means. Therefore, when the air cylinder 1601 operates, the panel heater frame 162 and the aluminum plate 1663 move up and down integrally from the descending position 1667 as shown in FIG.
- the panel heater frame 162 After the panel heater frame 162 comes into contact with the stopper ⁇ "1606 provided at the contact position, as shown in Fig. 13, the panel heater frame 16 Since the ascent is stopped, only the aluminum plate 16 3 rises, and the panel heater frame 16 2 and the aluminum plate 16 3 are separated from each other, and the aluminum plate 16 3 rises to the elevation position 16 8
- the gap between the panel heater frame 162 and the azolemmium plate 163 when the separation is completed is about 2 to 4 mm.
- the above stopper 1 6 0 6 is provided Only the aluminum plate 16 3 descends to the contact position, and the panel heater frame 16 2 and the aluminum plate 16 3 descend integrally from the contact position to the descending position 16 7.
- the temperature of the aluminum plate 163 needs to be lowered to about 40 ° C when the next new wafer before bump formation 201 is mounted, but as described above, the panel heater
- the cooling rate of the aluminum plate 16 3 can be improved compared to the conventional case, and the tact time can be reduced.
- the use of the above separation structure can improve the cooling rate, so that the Becomes effective.
- the panel heater frame 16 2 and the aluminum plate 16 3 may be combined, and the panel heater frame 16 2 will drop to about 40 ° C. Because there is no need to wait, the temperature difference in the panel heater frame 16 2 becomes smaller than before. Therefore, since the load on the panel heater 161 can be reduced, the life of the panel heater 161 can be extended as compared with the conventional case.
- the panel heater frame 16 2 and the aluminum plate 16 3 are configured to be separable, but as a simple type, the panel heater frame 16 2 and the aluminum plate 16 6 It is also possible to configure so as to always ascend and descend integrally without separating from. Also, as described above, the panel heater frame 162 and the aluminum
- a groove 1607 and an air inlet / outlet 1608 are formed.
- Air port 1 As shown in FIG. 14, the nozzle 608 communicates with the blow suction passage 169 formed in the aluminum plate 163. 01 Air is blown out when separating wafer 201 before bump formation from wafer mounting surface 16 3 a when transporting 01, or when removing the charge on the back surface of wafer 201 before bump formation. This is a hole for air suction when the pre-bump-forming wafer 201 is sucked and held on the wafer mounting surface 163a, which is not basically performed in the present embodiment.
- the blow suction passage 1609 is connected to a blow suction device 1611 controlled by a control device 180 via a connecting pipe 1610 as shown in FIG. Is done.
- air is used as the gas to be jetted as described above, but another gas may be used.
- the blow suction device 1611 functions as a gas supply device for performing a warp correcting operation and a static elimination operation of the wafer before bump formation 201 by supplying gas.
- a refrigerant passage 1612 for cooling the aluminum plate 163 is formed in the anode plate 163.
- room temperature air is used as the refrigerant, but other gases, water, or the like may be used.
- the refrigerant passage 16 12 is connected to the cooling air supply device 16 13 controlled by the control device 180 via the connecting pipe 16 14 as shown in FIG. .
- the cooling air supplied to the refrigerant passage 16 16 flows through the refrigerant passage 16 12 according to the arrow shown in the figure, and is exhausted through the connecting pipe 16 15.
- the electrode portion 15 in the circuit portion 20 formed on the semiconductor substrate is formed, for example, by vapor deposition using a metal such as aluminum which forms the electrode portion 15 on the circuit portion 20 with a desired film thickness. It is formed up to.
- the metal at the time of forming the electrode portion 15 is a state in which aluminum particles are deposited, and the aluminum particles have a diameter of 0.05.
- the electrode portion 15 is in a fragile state due to imperfections of coarse particles.
- the bump 16 is formed on the electrode portion 15, the molten metal ball to be the bump 16 is pressed against the electrode portion 15 while being ultrasonically oscillated. It is considered that the above ultrasonic vibrations and the like act on 5, causing phenomena such as collapse of the metal of coarse particles, and as a result, stable bonding between the electrode portion 15 and the bump 16 cannot be achieved.
- aluminum is used for the electrode portion 15 and the film thickness 22 is thin, the above-mentioned unstable bonding occurs remarkably.
- the heating before the formation of the bump 16 on the pre-bump forming wafer 201 on which the electrode portion 15 is formed is performed by the above-described pre-forming bonding promotion temperature control.
- the bonding pre-forming temperature control is performed for the pre-bump forming wafer 201 at a temperature equal to or higher than the bump bonding temperature. This is a control for heating the wafer before bump formation 201 to a bonding-promoting temperature lower than the damage prevention temperature or lower.
- FIG. 15 is a diagram created based on an electron micrograph showing a state before the execution of the pre-formation bonding promotion temperature control on the substrate surface in the vicinity of the bump formation location, and FIG.
- the figure was prepared based on an electron micrograph of the vicinity after performing the temperature control for bonding promotion before formation in the vicinity, and the original electron micrograph was a magnification of 100,000 times in both cases. It is.
- the particles indicated by reference numeral 21 are aluminum particles forming the electrode portion 15, and the particles 21 shown in FIG. 16 are smaller than the particles 21 shown in FIG. Pre-forming temperature to promote bonding It can be seen that the fineness of the aluminum particles was advanced by executing the degree control.
- the post-heat apparatus 170 is also an apparatus that performs one of the characteristic operations in the bump forming apparatus 101 of the present embodiment. That is, the post-heater 170 forms the bumps 16 on the electrode portions 15 of the wafer 201 before bump formation, and then forms the electrode portions 15 and the bumps 1 on the wafers 202 after bump formation.
- This is a device for performing post-formation bonding promotion temperature control for promoting the bonding with 6, and is roughly divided into a post-heating unit for heating the wafer 202 after bump formation, and the post-formation bonding to the post-heating unit.
- a control unit for performing temperature control for acceleration In the present embodiment, the control unit corresponds to the control device 180.
- the post-heating unit is configured as follows.
- the panel heater frame and the aluminum plate are separated from each other.
- the reference numerals for both the preheating device 160 and the postheating device 170 are shown.
- the operation of the panel heater 17 1 is controlled by the controller 180 in order to control the temperature of the wafer 202 after the bumps are formed.
- a metal plating as shown in FIG. 4 and a silver plating 261 in the present embodiment are applied to the wafer mounting surface 173a of the aluminum plate 173. ing.
- the silver plating By applying the silver plating, the thermal conductivity between the aluminum plate 173 and the wafer 202 after the bump is formed is improved, and the static electricity removing effect of the wafer 202 after the bump is formed is also increased. .
- the above-described post-formation bonding promotion temperature control is performed by heating the post-bump formation wafer 202 to a post-formation bonding promotion temperature equal to or higher than the bump bonding temperature and equal to or lower than the bump formation wafer damage prevention temperature. Further, in the present embodiment, the wafer 202 is maintained after the bump formation at the post-formation bonding promotion time at the post-formation bonding promotion temperature, and is substantially at room temperature after the post-formation bonding promotion time has elapsed. After the bumps are formed, the temperature of the wafer 202 is controlled.
- Such a post-formation bonding promotion temperature control does not optimize the metal particles of the electrode portion 15 like the pre-formation bonding promotion temperature control performed in the preheating device 160, but instead of the bump 1.
- This is a control for promoting the diffusion of both materials at the joint interface between the electrode part 6 and the electrode part 15.
- a program for performing the above-described pre-formation bonding promotion temperature control and post-formation bonding promotion temperature control is stored in the storage device 181 provided in the control device 180.
- the present invention is not limited to this.
- the above program may be supplied from a recording medium such as a CD-ROM, a floppy disk, or the like to a control device 180 via a reading device 183.
- it may be configured to supply the data via a communication line.
- the temperature control for promoting the bonding before forming and the temperature control for promoting the bonding after forming can be independently executed. Further, for example, when the time for promoting the bonding before forming is extended, the time for promoting the bonding after forming is reduced.
- the control unit 180 can control both controls in association with each other, for example, by shortening the control.
- the elevating device 150 includes a first elevating device 15 1 on which the first storage container 205 is placed, and a second elevating device 1 on which the second storage container 206 is mounted. 5 and 2.
- the first lifting / lowering device 151 raises / lowers the first storage container 205 so that the wafer before bump formation 201 is located at a position where it can be taken out by the loading device 1331.
- the second lifting / lowering device 152 is configured to store the bump-formed wafer 202 held by the unloading device 132 in the second storage container 206 at a predetermined position.
- the storage container 206 is raised and lowered.
- the operation of the bump forming apparatus 101 of the present embodiment having the above-described configuration, that is, a bump forming method will be described below.
- the operation of each component described above is controlled by the control device 180 so that bumps are formed on the wafer 201 before bump formation, and the wafer 202 after bump formation is stored in the second storage container 206. A series of operations are performed.
- the control device 180 controls the pre-bonding promoting temperature control on the pre-bump-forming wafer 201 by the pre-heating device 160, and further, the pre-heating device 160 It is also possible to control the static elimination blow operation and the warpage correction blow operation for the wafer 201 before the bump formation, which can be executed by the above.
- control device 180 controls the post-forming device 170 to control the temperature of the post-forming wafer 202 after the formation of the bump in the post-heating device 170 to promote the bonding. It is also possible to control the charge elimination blow operation and the warp correction blow operation for the wafer 202 after the bump formation, which can be performed at 0.
- step 10 enable the wafer before bump formation
- a bump is formed on the substrate 201, and the wafer 202 is stored in the second storage container 206 after the bump is formed.
- the first storage device 205 is used to carry out the first storage so that the wafer before bump formation 201 can be taken out of the first storage container 205 by the carry-in device 131.
- the container 205 moves up and down, and thereafter, the wafer before bump formation 201 is taken out of the first storage container 205 by the carry-in device 131.
- the wafer 201 before bump formation held by the carry-in device 13 1 is oriented in the orientation flat by the orientation flat aligning device 13 3.
- step 2 the wafer before bump formation 201 held on the holding table 1311 of the carry-in device 13 1 is clamped by the carry-in transfer device 141. The operation will be described in detail with reference to FIGS.
- the holding section 1 33 3 of the orientation flat aligning apparatus 1 33 rises, and the wafer before bump formation 201 is sucked and held from the holding table 1 31 1 and rises.
- the wafer holding unit 14 11 is placed above the wafer before bump formation 20 1, and the first holding member 14 14 and the second holding member 14 5 moves in the opening direction along the X direction.
- the holding portion 133 3 3 is lifted, so that the leading end of the charge removing contact member 14 16 1 of the wafer holding portion 14 11 It contacts the surface 201a of the wafer 201. Therefore, even if the surface 201a is charged immediately before the contact with the contact member for static elimination 14161, the contact with the contact member for static elimination 1416 removes the charge.
- the first holding member 1414 and the second holding member 1415 move in the closing direction along the X direction by the drive unit 1412.
- the holding table 1311 descends, and the wafer 201 before bump formation is held by the holding claws 1417 of the wafer holding section 1411. You. At this time, the pre-bump-forming wafer 201 is pressed against the holding claws 14 17 by the urging force of the springs 14 16 2 provided on the charge removing contact member 14 16 1.
- the pressing force is such that the wafer 201 before the bump formation by the wafer holding portion 141 does not cause a problem such as dropping when the wafer 201 is transferred, and may cause the wafer 201 before the bump formation to be deformed. Not.
- the wafer holding section 14 11 is moved above the pre-heating apparatus 16 0 by the moving apparatus 14 13 while holding the wafer 20 1 before bump formation. Conveyed and arranged. Then, in the next step 4, a preheating operation is performed on the wafer before bump formation 201 by the preheating device 160 in the preheating apparatus 160 by the preheating bonding promotion temperature control.
- the preheater 160 has a structure in which the panel heater frame 162 and the anode plate 163 can be separated. Therefore, when the aluminum plate 163 is at a temperature equal to or higher than room temperature, before the bump-forming wafer 201 is conveyed above the preheating device 160, that is, before the step 3 is executed, Steps 5 10 to 5 15 shown in FIG. 22 are executed to cool the aluminum plate 16 3. See Figure 23 for steps 5 10 to 5 15 And will be described later.
- step 3 above as shown in FIG. 24, the wafer holding section 144 1 1 1 is moved by the moving apparatus 1 4 1 3 to the pre-heating apparatus while the wafer 201 before bump formation is held. It is transported and placed above 160. Then, the above step 4 is started.
- FIG. 22 shows the detailed operation by the temperature control for promoting the pre-formation bonding in Step 4, and FIGS.
- step 401 shown in FIG. 22 the wafer 20 before bump formation is moved by the moving device 14 13 above the aluminum plate 16 3 at the preheating start temperature T 0 of about 40 ° C.
- T 0 the preheating start temperature
- the wafer before bump formation 201 is gradually heated by the radiant heat from the anolem plate 163.
- the pre-bump forming wafer 201 is not immediately brought into contact with the anorem medium plate 163, but is first held in the air and heated, thereby applying thermal stress to the pre-bump forming wafer 201 at room temperature.
- physical damage to the wafer 201 before bump formation and destruction of the formed circuit can be prevented.
- the heating time in the step 401 is about 1 to 3 minutes, and the wafer before bump formation at about 27 ° C. as the room temperature is heated up as shown in FIG. Heated to around 40 ° C in the curve.
- the heating time and the temperature of the wafer 201 before bump formation are not limited to the above examples.
- the type, material and size of the wafer 201 before bump formation, and The material and size of the electrode portion 15 and the bump 16 are changed based on the thickness of the electrode portion 15, the diameter of the pedestal portion 16a of the bump 16 and the like.
- FIG. 25 is an enlarged view of the portion III shown in FIG.
- the aluminum plate 163 is raised again to the raised position 168.
- the holding claws 14 17 provided on the wafer holding portion 14 11 enter the escape grooves 16 07 formed in the aluminum plate 16 3 as shown in FIG. Therefore, the wafer 201 before bump formation held by the wafer holding section 141 1 is placed on the aluminum plate 163.
- the loading / unloading transfer device 14 1 and the unloading transfer device 14 2 are provided with an elevating mechanism. Therefore, it is necessary to move the aluminum plate 163 up and down in order to carry in the wafer 201 before bump formation into the preheater 160 and to perform the mounting operation on the aluminum plate 163.
- next step 4003 as shown in FIG. 28, the first holding member 1414 and the second holding member 1415 of the loading-side transfer device 141 are opened, and the next step 400 is performed.
- step 4 as shown in Fig. 29, the aluminum film plate 163 is lowered to the above-mentioned lowering position 1667.
- the next step 405 as shown in FIG. 26, the aluminum plate 163 is heated by energizing the panel heater 161, and the aluminum plate 163 and the wafer 20 The wafer before bump formation 201 is heated from the temperature in the vicinity of the preheating start temperature TO to the pre-formation bonding promotion temperature T1 in a state in which the wafer 2 is in contact with 1.
- the pre-formation bonding promoting temperature T1 is a temperature not lower than the bump bonding temperature T2 and not higher than the damage prevention temperature TB of the pre-bump formation wafer 201 as an example of the semiconductor substrate.
- the damage prevention temperature TB is a temperature at which the wafer before bump formation 201 causes physical damage or circuit breakage, which may hinder the wafer before bump formation 201.
- the temperature is about 0 ° C.
- the reason why the bonding promotion temperature T1 before formation is set to be equal to or higher than the bump bonding temperature T2 is that even if heating is performed at a temperature lower than the bump bonding temperature T2, only the oxidation of the surface of the electrode portion 15 proceeds. This is because it is not possible to expect the above-described optimization of making the metal particles of the electrode portion 15 fine, and thus it is impossible to improve the bonding state of the bump 16.
- the bump bonding temperature T 2 is 150 ° C.
- the damage prevention temperature TB is about 300 ° C. It is set to 10 ° C.
- the temperature rising gradient up to the pre-formation bonding promoting temperature T1 is 30 ° C./min.
- the temperature T2 for bump bonding, the temperature T1 for promoting bonding before formation, and the temperature rise gradient are not limited to the above-mentioned values.
- the bump is raised to the bonding promoting temperature T1 of about 210 ° C before forming.
- the pre-formation bonding promotion time t 1 is maintained. Providing such a holding time promotes the optimization of metal particles such as miniaturizing the metal particles of the electrode portion 15.
- the bonding promoting time t1 before formation is set to about 10 minutes.
- the bonding promoting time t1 before formation is not limited to this value.
- the type, material and size of the wafer 201 before bump formation, the electrode portion 15 and the bump 16 It is changed based on the materials and sizes of the electrodes, especially the film thickness of the electrode portion 15, the diameter of the pedestal portion 16a of the bump 16 and the like.
- the temperature of the preheater 160 is measured by the temperature sensor 166 provided on the aluminum plate 163 as described above. 1 and the wafer before bump formation 201 is thin, so that the temperature of the aluminum plate 163 and the temperature of the wafer before bump formation 201 can be regarded as the same.
- the temperature of the pre-bump-forming wafer 201 is started when the pre-formation bonding promoting time t1 has elapsed. That is, the energization to the panel heater 16 1 is controlled to cool the aluminum plate 16 3, and the bumps are formed from the above-mentioned bonding promoting temperature T 1 of about 210 ° C. before forming to the above-mentioned bump bonding temperature T 2. Unformed wafer
- the reason for setting the target temperature for cooling to the temperature T 2 for bump bonding is that the bump 16 is formed next at the temperature T 2 for bump bonding.
- the temperature decrease gradient is the same as the temperature increase gradient.
- the temperature drop gradient is not limited to the above value.
- the type, material and size of the wafer 201 before bump formation, and each material and size of the electrode portion 15 and the bump 16 are particularly The temperature gradient may be changed based on the film thickness of the electrode portion 15, the diameter of the pedestal portion 16a of the bump 16 and the like, and the temperature rising gradient and the temperature falling gradient may be different.
- the wafer before bump formation 201 generates electric charges based on a temperature change
- the probability of occurrence of damage to the wafer before bump formation 201 increases when the temperature drop gradient is large. Therefore, in such a case, it is preferable to make the temperature drop gradient gentler than the temperature rise gradient.
- the preheating operation ends.
- the present embodiment In order to reduce the temperature difference between the temperature of the aluminum plate 163 and the wafer before bump formation 201, for example, for 0 to 1 minute, the wafer before bump formation 201 and the aluminum plate 163 are connected to each other. Is kept in contact. By performing such an operation, for example, even if the wafer 201 before bump formation is sensitive to temperature change, there is no problem, and the wafer is moved to the bonding stage 110 at the bump bonding temperature T2 of about 150 ° C. Is possible.
- step 5 After the preheating operation is performed on the wafer before bump formation 201 by the above-described temperature control for bonding promotion before formation, the operation of step 5 is performed on the wafer before bump formation 201. On the other hand, for the preheating device 160, the temperature lowering operation to the preheating start temperature T0 is performed.
- the metal particles having a large particle size in the electrode portion 15 change to a state where the particles are refined, and the electrode portion Strength of 15 is improved. Therefore, when the bump 16 is formed, the bonding strength between the electrode portion 15 and the bump 16 can be improved.
- FIG. 1 After forming a gold bump 16 having a diameter of about 90 / xm of the pedestal portion 16a on each electrode portion 15 of the wafer subjected to the preheating operation, FIG. As shown in FIG. 0, a shear measuring member 17 was applied to the pedestal portion 16a at a position 3 ⁇ m from the surface of the electrode portion 15 to measure the shearing state.
- the bump formation itself can hardly be achieved, and even if the bump is formed, the shearing force is, for example, 240 to 50 O Since the shear force was low and the variation was large, it was not practical.
- the temperature T 1 for promoting bonding before formation is a temperature equal to or higher than the temperature T 2 for bump bonding, and in the above embodiment, the temperature T 2 for bump bonding is set to 150 ° C. From about 60 ° C added to the temperature T 2 for bump bonding. It is 210 ° C.
- the bonding promoting temperature T1 before formation is related to the bump bonding temperature ⁇ 2. For example, if the bump bonding temperature ⁇ 2 is approximately 210 ° C., add approximately 30 to 40 ° C. It is preferably about 240 to 250 ° C. Therefore, the temperature T1 for promoting bonding before formation is preferably a value obtained by adding 30 to 60 ° C to the temperature T2 for bump bonding.
- the temperature T 1 must be set excessively high before bonding since the temperature lowering rate must be slower than the temperature raising rate so as not to damage the wafer 201 before bump formation. Then, it takes time to lower the temperature to the bump bonding temperature T 2. Therefore, in consideration of the tact time, the optimum value of the bonding promoting temperature T1 before formation is a value obtained by adding about 60 ° C. to the bump bonding temperature T2. In the above-described embodiment, the bonding-promoting temperature T1 before formation is set to a temperature higher than the bump-bonding temperature T2. However, if the tact is ignored, as shown in FIG. The temperature may be the same as the temperature T2.
- the above-described bonding promotion time t1 before formation is set to 10 minutes in the above-described embodiment, it needs to be changed according to the bonding promotion temperature T1 before formation.
- the time t for promoting bonding before formation is set from about 1 second to about 10 minutes.
- the pre-formation bonding promotion time t1 is set to about 1 second. This is because, if a time longer than about 1 second is set, the reaction of the metal crystal of the electrode portion 15 will be excessive, and it will be difficult to respond in the event of a trouble. .
- an electric charge may be generated in the wafer before bump formation 201 due to a temperature change of the wafer before bump formation 201 due to the preheating operation described above. Since the wafer before bump formation 201 is placed on the aluminum plate 163, the charge is grounded via the aluminum plate 163 and the charge can be removed.
- Step 5 is executed after the above-described preheating operation.
- Step 5 First, as shown in FIG. 23, the transfer operation of the wafer before bump formation 201 is performed from the preheating device 160 to the bonding stage 110.
- step 501 of FIG. 23 the first holding member 14 14 and the second holding member 14 15 move in the opening direction by the operation of the drive unit 14 12 of the loading side transfer device 14 1 I do.
- step 502 the aluminum plate 163 of the preheater 166 is moved from the lower position 167 to the upper position 168.
- the holding claws 14 17 provided on the first holding member 14 14 and the second holding member 14 15 enter the respective escape grooves 16 07 of the aluminum plate 16 3.
- the first holding member 144 and the second holding member 144 are closed.
- the blow suction device 1611 is operated to blow air from the air inlet / outlet 1608 of the aluminum plate 1663, and the aluminum film plate 163 and the wafer before bump formation 20 Separate from 1.
- the temperature of the air to be jetted is such that the temperature of the preheated pre-bump wafer 201 can be prevented from lowering as much as possible, for example, about 160 ° C.
- the aluminum plate 163 is lowered in step 505, and the wafer 201 before bump formation is moved to the first holding member 144 and the second holding member 145.
- step 506 the operation of the above-mentioned professional suction device 1611 is stopped to terminate the blowing operation, and in step 507, the heated wafer before bump formation 201 is held.
- the wafer holding section 14 11 is moved above the bonding stage 110. Thereafter, the operation shifts to the mounting operation on the bonding stage 110 described later.
- the preheating apparatus plate 160 of the preheater 160 heated to about 150 ° C. is heated again to the preheating start temperature T 0 before the next wafer before bump formation 201 is mounted. It is necessary to cool down. Therefore, in step 510 shown in FIG. 23, the cooling air supply device 1613 is operated to supply cooling air to the refrigerant passage 1612 in the aluminum plate 163.
- the aluminum plate 16 3 is moved from the lower position 16 7 to the upper position 16 8 by operating the air cylinder 16 1 of the pre-heater 16 0.
- the panel heater frame 16 2 is separated from the aluminum plate 16 3, and the temperature of the aluminum plate 16 3 is cooled down to about 40 ° C. In this embodiment, the cooling of the aluminum plate 163 is performed. Although the temperature is set at about 40 ° C., the temperature is not limited to this.
- step 513 the operation of the cooling air supply device 163 is stopped in step 513 to terminate the supply of cooling air.
- step 514 the arm plate 16 3 is lowered, and in step 5 15, the wafer holding section 14 1 1 of the loading-side transfer device 14 1 is placed above the transfer device 13 0. return.
- step 507 shown in FIG. 32 as shown in FIG.
- the wafer before bump formation 201 held by the wafer holding unit 1 4 1 1 is carried into the bonding stage 110.
- the bonding stage 110 is rotated to adjust the carry-in angle of the wafer 201 before bump formation to the bonding stage 110.
- the wafer mounting table 1 1 1 is raised in the thickness direction of the wafer 201 before bump formation, and the back surface 201 of the wafer 201 before bump formation is formed. b, and push up the wafer 201 a little further.
- the holding claws 1 4 1 7 of the wafer holding section 1 4 1 1 enter the relief grooves 1 1 6 formed on the wafer mounting table 1 1 1. .
- the contact member for static elimination 14 1 6 2 which is in contact with the surface 2 0 1 a of the wafer 2 1 before bump formation is pressed against the biasing force of the spring 14 2 Pushed up while maintaining contact with O la.
- the first holding member 14 14 and the second holding member 14 14 are operated by the operation of the drive unit 14 12 of the loading side transfer device 14 1. 5 opens Then, the holding of the wafer before bump formation 201 by the wafer holding unit 144 1 1 is released.
- the blow device 1 15 is operated, and the air inlet / outlet 1 1 3 opened in the wafer mounting table 1 1 1 is approximately 160 ° C.
- a degree of the above-described warp correcting hot air is blown to the wafer 201 before bump formation.
- the wafer before bump formation 201 rises from the wafer mounting table 111 by about 0.5 mm, but the first holding member 14 around the wafer before bump formation 201 is about 0.5 mm. Since the holding claws 14 17 of the 14 and the second holding members 14 15 are present, the lifted wafers 201 before bump formation do not fall off the wafer mounting table 1 1 1.
- step 535 the operation of the blowing device 115 is stopped in step 535, and the blowing of the hot air for correcting warpage is terminated.
- step 536 the suction device 1 14 is operated to start suction from the air inlet / outlet 1 13 to suck the wafer 201 before bump formation onto the wafer mounting table 1 1 1.
- step 537 it is detected that the above-mentioned suction has been performed.
- step 538 as shown in FIG. 36, the wafer mounting table 1 1 1 holds the pre-bump-formed wafer 201. And descend to the original position.
- the warp correction operation ends. After that, the wafer holding unit 1411 of the loading-side transfer device 1411 moves above the transfer device 130.
- the bump forming head 1 20 bumps the electrode portion 15 into the electrode portion 15 of the circuit on the wafer before bump formation 21 mounted on the bonding stage 110. 6 is formed.
- the temperature of the wafer before bump formation 201 at the time of bump formation is set to 150 ° C. as described above.
- Step 6 the wafer 2 after the bump formation with the first holding member 144 2 4 and the second holding member 144 2 5 in the wafer holding portion 144 2 1 of the unloading side transfer device 144 2 0 2 is held, and the moving device 1 4 2 3 of the unloading side transfer device 1 4 2 3 drives the ueno and the holding portion 1 4 2 1 in the X direction, and as shown in FIG.
- the wafer 202 is placed above the 170.
- step 7 the wafer is placed on the post-heater 170, and the boss including the temperature control for bonding promotion after the formation is performed. A tote operation is performed.
- step 601 the anore-membrane plate 173 of the bottom heat device 170 is heated to the above-mentioned 150 ° C. which is the above-mentioned bump bonding temperature T 2.
- step 6 the wafer 202 after the bump formation held in the wafer holding section 1442 is carried in above the post-heater 170.
- step 701 which constitutes step 7, the heated aluminum plate 173 is raised from the lowered position 167 to the raised position 168. Due to the ascent operation, the wafer 202 after the bump is formed is brought into contact with and mounted on the anode plate 173. At this time, each of the holding claws 1 4 1 7 provided on the first holding member 1 4 2 4 and the second holding member 1 4 2 5 in the wafer holding section 1 4 2 1 of the unloading side transfer device 1 4 2 Then, it enters the escape groove 1707 formed in the aluminum plate 173. Then, in the next step 720, the first holding member 1442 and the second holding member 1442 of the wafer holding portion 1442 of the unloading-side transfer device 142 are opened, and after the bumps are formed. The holding of the wafer 202 is released. In the next step 703, the aluminum plate 173 on which the wafer 202 after the bump formation is placed is lowered from the raised position 168 to the lowered position 167.
- the next step 704 by heating the aluminum plate 173 by energizing the panel heater 161, the aluminum plate 173 and the wafer 207 after the bumps are formed are formed.
- the wafer 202 is heated from the bump bonding temperature T2 to the bonding promotion temperature T3 after the bump formation.
- the post-formation bonding promoting temperature T3 is a temperature equal to or higher than the bump bonding temperature T2 and equal to or lower than the damage prevention temperature TB of the bump-formed wafer 202 as an example of the semiconductor substrate.
- the damage prevention temperature TB is, as described above, that the wafer 202 after the bump formation physically damages or the circuit breaks down, and the wafer 202 after the bump formation forms the wafer 202 after the bump formation.
- This is a temperature that causes trouble, specifically, the above-mentioned temperature for bump bonding T 2 + about 150 ° C.
- the post-formation bonding promoting temperature T3 is set to about 210 ° C., which is the same as the above-described pre-formation bonding promotion temperature T1, but it can be, of course, changed.
- the temperature rising gradient from the above-mentioned temperature T2 for bump bonding to the above-mentioned temperature T3 for promoting bonding after formation is 30 ° C./min as in the case of the above-mentioned preheating operation.
- the temperature rise gradient is not limited to the above-described value.
- the type, material, size, etc. of the wafer 202 after bump formation, and each material and the electrode portion 15 and the bump 16 The size is changed based on the thickness of the electrode portion 15, the diameter of the pedestal portion 16 a of the bump 16, and the like.
- the post-formation bonding promoting time t3 is set to about 10 minutes.
- the post-formation bonding promotion temperature T3 is maintained for 10 minutes as described above, but the post-formation bonding promotion temperature T3 and the holding time at this temperature are different from each other. As shown in FIG. 8, there is a correlation, and there is a region 185 where the bonding strength between the bump 16 and the electrode portion 15 can be improved. That is, as described above, the post-heating operation is an operation for promoting metal diffusion between the bump 16 and the electrode portion 15, so that the bonding promoting temperature T 3 after the formation is changed to the bump bonding temperature T 2. When set to a slightly higher temperature, a relatively long holding time is required.
- FIG. 38 is a diagram showing the concept of the correlation and the area 185.
- the bonding-promoting time t3 after the formation is not limited to the above value.
- the electrode section The size of the thickness 15a of the minute 15 and the size of the pedestal portion 16a of the bump 16 are important factors for setting the above-mentioned bonding promotion temperature T3 after the formation and the above-mentioned bonding promotion time t3 after the formation. is there.
- the above-mentioned bump bonding temperature T 2 is about 270 ° C.
- Temperature T3 is set at about 300 ° C.
- the temperature of the wafer 202 after the bump formation is started when the post-formation bonding promoting time t3 has elapsed. That is, the energization to the panel heater 17 1 is controlled to cool the aluminum plate 17 3, and after forming the above-mentioned about 210 ° C., and after forming the bump from the bonding promoting temperature T 3 to about 40 ° C. Lower the temperature of wafer 202.
- the temperature decreasing gradient is set to 30 ° C./min, which is the same as the temperature increasing gradient.
- the temperature drop gradient is not limited to this value.
- the temperature gradient may be changed based on the film thickness of the portion 15 and the diameter of the pedestal portion 16a of the bump 16 or the temperature rising gradient may be different from the temperature decreasing gradient.
- the wafer holding section 1442 of the unloading side transfer device 142 is placed above the post heat device 170, and then the aluminum plate of the post heat device 170 is placed. Raise 1 7 3 from the lower position 1 6 7 to the upper position 1 6 8, and after forming bumps on the first holding member 14 2 4 and the second holding member 1 4 2 5 in the above wafer holding section 14 2 1
- the wafer 202 is held.
- the blow suction device 1711 is operated to blow air for blowing from the air inlet / outlet hole 170 of the aluminum plate 173, and the wafer 202 after the bump is formed is blown out. Float from aluminum plate 1 7 3.
- FIG. 39 is an enlarged view of the portion indicated by IV in FIG.
- the reason why the wafer 202 is cooled after the bumps are formed above the post-heater 170 as described above is that the temperature is about 40 ° C. to room temperature. If the temperature is dropped to about 27 ° C.
- the wafer 202 may be damaged after the bumps are formed, so that the damage is prevented.
- the cooling time in the air is set to 0 to about 2 minutes, and the wafer 202 becomes about 37 ° C. after bump formation by the air cooling.
- the above cooling time can be changed depending on the type, material and the like of the wafer 202 after the bumps are formed.
- the wafer holding unit 1 4 2 1 Is moved in the X direction to remove it from above the post-heater 170, and after the bumps are formed, the wafer 202 is cooled naturally. After the bumps are formed by the natural cooling, the wafer 202 is cooled to the room temperature.
- Step 8 the operation of Step 8 is executed for the wafer 202 after bump formation.
- the panel heater 171 was energized to prepare for receiving the wafer 202, and the aluminum plate 1773 was heated to the above-mentioned bump bonding temperature T2. The temperature is raised.
- the bonding promotion temperature T3 after the formation is set to a temperature exceeding the bump bonding temperature T2.
- the same as the bump bonding temperature T2. Temperature can also be used.
- the bonding strength between the bump 16 and the electrode portion 15 can be improved as described above. Furthermore, by performing the preheating operation and performing the postheating operation as in the present embodiment, a synergistic effect between the two can be obtained. Specifically, for example, when a gold bump 16 having a bump pedestal diameter of approximately 90 ⁇ m is formed on an electrode portion 15 made of aluminum and having a thickness of about 2000 A, the above preheating is performed. The average shear strength per bump when performing only the operation is about 680 mN, and the variation is about 200 mN. On the other hand, by executing the above post-heat operation, the shear strength per bump can be improved to about 80 OmN on average, and the variation can be reduced to about 140 mN. .
- the post-formation bonding promotion temperature T 3 the formation bonding temperature, and the like are particularly determined based on the number of circuit portions formed on the wafer, and thus the number of bumps formed.
- the post-joining promotion time t 3 may be determined.
- the control for promoting the pre-forming bonding in the preheating operation and the control for promoting the post-forming bonding in the postheating operation are controlled in association with each other.
- Such associated control can be executed by the control device 180.
- the pre-formation bonding promotion time t1 in the pre-formation bonding promotion control is long
- the post-formation bonding promotion time t3 in the post-formation bonding promotion control is used.
- the above-described pre-formation bonding promotion time t1 is shortened compared to the above-mentioned pre-formation bonding promotion time t1, It is made longer than the service time t1.
- the above-mentioned bonding promotion control before formation and the above-mentioned bonding promotion control after formation can be controlled so as to complement each other.
- step 8 After the end of the above-described post heat operation, the process proceeds to step 8 and the following operation is performed.
- the wafer holding section 14 2 1 of the unloading side transfer device 14 2 holding the wafer 20 2 after the bumps are formed is moved out of the unloading device 1 3 along the X direction by driving the moving device 1 4 2 3.
- Move up 2 Figure 6 shows the state after the movement.
- the driving unit 1 3 2 4 of the unloading device 1 3 2 operates, and as shown in FIG. 40, the holding unit 1 3 2 3 contacts the back surface 202 b of the wafer 202 after the bumps are formed. Then, after the reinforced bump is formed, the wafer 202 is lifted so as to float about 1 mm from the holding claws 14 17 of the wafer holding portion 14 21. After the ascent, the holding section 1323 holds the wafer 202 after the bump formation by the suction operation.
- the holding portions 1 3 2 3 hold the wafers 202 after the bumps are formed, as shown in FIG. 41, the first holding members 14 2 4 and the second holding members 14 of the wafer holding portions 14 21 2 5 It is opened by the drive unit 142 and the holding of the wafer 202 is released after the bumps are formed. After the release of the holding, as shown in FIGS. 42 and 43, the holding section 13 23 descends, and after the bumps are formed, the wafer 202 is placed on the holding table 13 21. After the mounting, the holding table 1321 holds the wafer 202 after bump formation by a suction operation in the present embodiment.
- the holding table 1 32 1 holding the wafer 202 after the bump formation is moved in the X direction by the operation of the unloading device moving device 1 32 2, and the wafer 202 after the bump formation is moved.
- the second storage container 206 side To the second storage container 206 side.
- the back surface 202 b of the wafer 202 after bump formation is negatively charged, and the front surface 202 a is positively charged.
- the ion generator 190-0-1 disposed on the back side 202b generates positive ions
- the ion generator 190-2 disposed on the front side 202a generates negative ions.
- Each of the ion generators 190-1 and 190-2 are connected to a controller 180 and controlled in operation.
- Fig. 44 shows the ion-improving device 190-1-1 when the wafer holder 1442, which holds the wafer 202 after bump formation, is placed above the unloading device 132.
- FIG. 19 shows the state where ions are applied to the wafer 202 after the bump formation from 190-2, but during the transfer operation as described above, that is, FIG. 40 to FIG. During each operation up to this point, the wafer is actuated on the wafer 202 after bump formation.
- the charge amount can be further reduced as follows, as compared with a case where the ion generator 190 is not provided.
- the following charge amount values are examples.
- the charge amount of the surface 202 a of the wafer 202 after bump formation is about +18 V
- the back surface 202 b is about 110 V as described above.
- the charge amount on the front surface 202 a becomes approximately +22 V, and 202 b can be about +22 volts. Therefore, the above-described temperature rise control and temperature drop control in the present embodiment are performed, and further, the ion is applied to at least the rear surface 202 b by the ion generator 190 to thereby charge the rear surface 202 b. The amount can be further reduced.
- a blower 191 may be provided on the side of 202 b for more efficiently moving the generated ions to the back surface 202 b.
- the operation of the blower 191 is controlled by the controller 180.
- an electrostatic sensor 25 1 is provided, and the charge amount of both surfaces including at least the back surface 202 b, and preferably the front surface 202 a is added to the electrostatic sensor 25 1.
- the controller 180 may control the amount of ions generated by the ion generator 190 and the amount of air blown by the blower 191 based on the measured charge amount. .
- the ion generator 19 is used. It may be configured so that ions by zero act.
- the ion by the ion generator 190 acts also in the preheating operation.
- the holding table 1321 stores the wafer 202 in the second storage container 206 after the bumps are formed.
- the bumps 16 are sequentially formed on the respective wafers before bump formation 201, and are stored in the second storage containers 206, respectively.
- the temperature control for bonding promotion before forming is performed by the preheating operation, and although both the post-formation bonding promotion temperature control and the post-heating operation are performed, the above-mentioned pre-formation bonding promotion temperature control may be performed at a minimum.
- the bumps 16 and the electrode portions 15, which had to be incompletely connected in the past can also have the metal crystal on the surface portions of the electrode portions 15. This is because the metal particles can be made more appropriate, that is, the metal particles can be made finer, and the bonding state can be completed.
- the temperature control for bonding promotion before forming is performed by the pre-heater 160 in order to reduce the force.
- the metal crystal state in the electrode portion 15 is improved as compared with the conventional case, and the bump 16 cannot be formed conventionally, or the desired bonding strength cannot be obtained even though the bump can be formed.
- Such a semiconductor substrate can also be bump-formed, and its bonding strength can be improved to such an extent that it can be sheared at the pedestal portion 16a of the bump 16.
- a bump strength improving apparatus a method executed by the bump strength improving apparatus, and a bump forming apparatus including the bump strength improving apparatus according to a second embodiment of the present invention will be described below with reference to the drawings. explain.
- the same components are denoted by the same reference numerals.
- FIG. 47 shows the bump forming apparatus 301 including the bump strength improving apparatus as an example of the second embodiment.
- a semiconductor component to be processed is a semiconductor chip obtained by cutting each electronic circuit formed on a semiconductor wafer, and a bump 52 on an electrode 51 of the semiconductor chip. Is formed.
- the above semiconductor components are not limited to the above semiconductor chips.
- the semiconductor wafer may be used.
- a bump forming apparatus that forms the bumps 52 on the electrodes 51 of the semiconductor wafer is configured.
- the bump forming apparatus 301 includes a semiconductor chip supplying apparatus 311, a semiconductor chip transporting apparatus 3 1 2, a bump forming section 3 1 3, a leveling apparatus 3 1 4, and a finished product collecting apparatus 3 1 5 And a bonding stage 316 and a control device 317.
- the semiconductor chip supply device 311 is a device for supplying the semiconductor chip to the semiconductor chip transport device 3112, and has a storage tray section 3111 and a tray transport device 3112.
- the storage tray 311 can store a tray for storing the semiconductor chips in a layered manner as shown in the figure.
- the tray transfer device 3 1 1 2 is a device that transfers the storage tray section 3 11 1 between the loading position and the unloading position along the X direction shown in the figure, and in the second embodiment, drives a ball screw. It has a feed mechanism driven by a motor 3 1 1 3 to perform a moving operation.
- the loading position is a position where the storage tray section 3 1 1 1 can be loaded into the tray transport apparatus 3 1 1 2, and the unloading position is a storage tray section 3 1 2 in the semiconductor chip transport apparatus 3 1 2. This is the position where the semiconductor chip contained in the unit can be taken out.
- the operation of the tray transfer device 3 11 12 is connected to the control device 3 17 and controlled.
- the semiconductor chip transfer device 3 1 2 takes out the semiconductor chip from the semiconductor chip supply device 3 1 1, places it on the bonding stage 3 1 6, and furthermore, a bump-formed semiconductor chip 6 1 Is transported from the above-mentioned bonding stage 3 16 to the finished product storage device 3 15 via a leveling device 3 14 described below.
- the X-direction moving mechanism 3 1 2 1 1 includes a feed mechanism that performs a moving operation by driving a ball screw with a drive motor 3 2 1 4.
- the direction moving mechanism 3 1 2 1 2 is attached.
- the Y-direction moving mechanism 31212 has a feed mechanism driven by a drive motor 31215, and the tip holding section 31213 is attached to the feed mechanism.
- the tip holder 3 1 2 1 3 In the second embodiment, the semiconductor chip is held by the suction operation of the suction device 31216.
- the operation of the drive motor 31214, the Y-direction moving mechanism 31212, the drive motor 31215, and the suction device 31216 is controlled by a control device 317.
- Such a chip transport mechanism 3121 operates as follows.
- the X-direction moving mechanism 311211 and the Y-direction moving mechanism 31212 are driven to dispose the chip holding portion 31213 at the take-out position, and the chip holding portion 31213 takes out and holds the semiconductor chip from the semiconductor chip supply device 311. .
- the X-direction moving mechanism 3121 1 and the Y-direction moving mechanism 31212 are driven again to move the chip holding portion 31213 holding the semiconductor chip to the bonding stage 316, and the semiconductor chip is connected to the bonding stage. Place on 316.
- the bumps 52 are formed on the electrodes 51 of the semiconductor chip, the semiconductor chip 61 on which bumps have been formed is held by the chip holding portion 31 213.
- the X-direction moving mechanism 3121 1 and the Y-direction movement are again performed.
- the bump-formed semiconductor chip 61 is mounted on the bonding stage 316 and on the leveling stage 3141 of the leveling device 314. Further, after the bump heights are adjusted by the leveling device 314, the bump-formed semiconductor chip 61 is held by the chip holding portion 31213, and after the holding, the X-direction moving mechanism 312 11 and the Y-direction moving mechanism are again applied. 31212 is moved to the finished product storage device 315 from above the leveling stage 3141.
- the chip setting mechanism 3122 is a device for setting the position of the semiconductor chip mounted on the bonding stage 316, and moves the position setting member 31221 and the position setting member 31221 in the X and Y directions. And a member moving mechanism 31222.
- the bonding stage 316 is a stage for holding the semiconductor chip placed and whose position is adjusted by suction and heating the semiconductor chip to a bump forming temperature. And a heating device 3162 for heating.
- the suction device 3161 and the heating device 3162 for heating are connected to a control device 317, and the operation of each is controlled.
- the bonding stage 3 16 has a space in which two semiconductor chips 60 can be placed, and the bonding stage 3 16 is alternately arranged in the two spaces. By mounting the semiconductor chip 60, the tact time can be improved.
- the size of the bonding stage 3 16 is not limited to a size capable of mounting two semiconductor chips 60, and may be a size capable of mounting three or more semiconductor chips. If the improvement of the tact time is not considered, the size may be such that one semiconductor chip 60 can be mounted.
- the heating device 3 16 2 includes a bump-formed semiconductor chip 6 1 corresponding to a bump-formed component in which the bump 52 is formed on the electrode 51 of the semiconductor chip 60.
- heating is also performed under the bonding strength improving condition for improving the bonding strength between the electrode 51 and the bump 52.
- the bonding strength improving space 3 16 3 corresponding to the heat-treated portion, in which heating is performed under the above bonding strength improving conditions in the bonding stage 3 16, is indicated by a mesh pattern.
- the position is not limited to this position. For example, it can be provided at a position shown by a dotted line in FIG.
- the bonding strength improving space 3 163 has a size capable of mounting the two bumped semiconductor chips 61, but is not limited thereto. The size may be such that three or more or one bump-formed semiconductor chip 61 can be placed.
- the bump forming unit 3 13 is a device for forming a bump 52 on an electrode 51 of a semiconductor chip 60 held on the bonding stage 3 16, and a bump forming head 3 1 3 1 and an X, Y table 3 1 3 2.
- the bump is formed by one bump forming unit 3 13.
- the above-mentioned bump-forming head 3 1 3 1 is formed by supplying a gold wire to be the bump 52 and melting the tip of the gold wire to form a bump 52.
- a gold wire supply unit for forming a molten ball called a pressing ball, and a pressing vibrating unit for applying ultrasonic vibration while pressing the molten pole onto the electrode 51 when forming a bump on the electrode 51.
- X, Y tape 3 1 3 2 moves the bump forming head 3 1 3 1 in the X direction, for example, a first driving source 3 1 3 2 1 composed of a motor, and a bump forming head 3 1 3 1 is moved in the Y direction, for example, a second drive source 3 1 3 2 2 composed of a motor is provided, and is driven by the first drive source 3 1 3 2 1 and the second drive source 3 1 3 2 2
- the bump forming head 311 31 is moved in the X and Y directions, thereby disposing the above-mentioned molten pole on a desired electrode 51 of the semiconductor chip 60.
- the first driving source 3 1 3 2 1, the second driving source 3 1 3 2 2, and the pressing vibrating unit 3 1 3 1 1 are connected to the control device 3 17, and as described above, The operation of the controller 317 is controlled so that the above-mentioned melting pole is arranged on the electrode 51 and the bump 52 is formed on the electrode 51.
- the leveling device 3 14 is a device for aligning the heights of the bumps 52 formed on the electrodes 51 of the semiconductor chip 60 in the bump forming section 3 13, as shown in FIG. 51. Thus, it has a leveling stage 314, a press device 314, and a pump height inspection device 314.
- the above-mentioned repelling stage 3 1 4 1 places a bump-formed semiconductor chip 6 1 and holds it by suction, and also has a moving mechanism 3 1 having a driving source 3 4 It is movable in the Y direction by 4 1 1.
- the press device 3 1 4 2 has a pressing plate 3 1 4 2 1 that contacts all the bumps 5 2 formed on the bumped semiconductor chip 6 1, and is held on the stage 3 1 4 By moving the pressing plate 3 1 4 2 1 in the thickness direction of the bump-formed semiconductor chip 6 1, each bump 52 is pressed, and the bump-formed semiconductor chip
- the bump height inspection device 3 1 4 3 is a device for inspecting the height of the bump 5 2 processed by the press device 3 1 4 2, and is, for example, a drive source 3 1 4 3 2 composed of a motor. It is attached to a moving mechanism 3 1 4 3 1 having a movable in the X direction.
- Each of the drive sources 3 1 4 1 2 and 3 1 4 3 2, the press device 3 1 4 2, and the bump height inspection device 3 1 4 3 are connected to the control device 3 17 to control the operation. .
- the finished product storage device 3 15 stores the bump-formed semiconductor chip 6 1, and stores the bump-formed semiconductor chip 6 1 in the same manner as the semiconductor chip supply device 3 11 described above. Conveying the storage tray 3 1 5 1 and the storage tray 3 1 5 1 And a tray transfer device. The operation of the finished product storage device 3 15 is controlled by the control device 3 17.
- a bump strength improving device including the above-described control device 317 is provided as one of the characteristic components.
- the bump strength improving device will be described in detail below.
- FIG. 52 shows a bumped semiconductor chip in which a gold bump 52 is formed on an aluminum electrode 51 of a semiconductor chip formed of a Si semiconductor substrate or of a Si semiconductor wafer.
- the graph shows the relationship between the shearing force at the bonding interface between the electrode 51 and the bump 52 and the elapsed time after the formation of the bump when heated at 0 ° C. and 100 ° C., respectively.
- the above-described shear force that is, the electrode 51 is maintained by keeping the bumped semiconductor chip or the bumped semiconductor wafer at an appropriate temperature for an appropriate time. It can be seen that the bonding strength between the metal and the bump 52 can be increased.
- This phenomenon is caused by maintaining the temperature of the bumped semiconductor chip or the bumped semiconductor wafer at an appropriate temperature, so that the material diffusion between the aluminum of the electrode 51 and the gold of the bump 52 progresses at the bonding interface. It is thought that this increases the bonding strength.
- the above-mentioned semiconductor chip has been conventionally heated. From the result of FIG. Even if the temperature is relatively low, the bonding strength can be improved by heating the bumped semiconductor chip after the bump formation at a temperature higher than the bump formation temperature. Understand.
- FIG. 52 shows the relationship between the temperature at the time of bump formation of the semiconductor chip or the semiconductor wafer at the time of bump formation and the shearing force.
- a relatively high temperature that is, about 100 to about 250 ° C. as judged from FIG.
- excessive heating may cause deterioration of the above-mentioned shear force.
- the bonding strength improvement conditions for improving the bonding strength so as to increase the bonding strength include the temperature and the time for heating the bumped semiconductor chip or the bumped semiconductor wafer. Is a condition that uses
- a heating time of about 3 hours soil a hour is preferable, and when heating at 200 ° C., for example, heating time of about 1 hour soil ⁇ time is preferable.
- a heating time of about 1 minute soil ⁇ seconds is preferable.
- an example of the a time is about 1 hour
- an example of the J3 minute is about 15 minutes
- an example of the ⁇ seconds is about 20 seconds.
- the increase in the bonding strength is considered to be due to the promotion of the diffusion between the material of the electrode 51 and the material of the bump 52. Therefore, such conditions for improving the bonding strength depend on the material of the electrode 51 and the electrode. 51, the material of the bump 52, the size of the bump 52, the semiconductor chip ⁇ the material of the semiconductor substrate constituting the semiconductor wafer, and at least one of the size of the semiconductor substrate; Preferably, at least one set of the material and size of the electrode 51, the material and size of the bump 52, and the material and size of the semiconductor substrate forming the semiconductor chip or the semiconductor wafer, or each of these sets Is determined by the combination of
- a Si semiconductor substrate is a square semiconductor chip with a side of 6 mm, and the electrode 51 is made of aluminum and has a size of 100 ⁇ m on a side.
- the thickness is 1 ⁇ m
- the bump 52 is made of gold
- the dimension D shown in Fig. 63 is ⁇ 80 m
- the dimension H which is the height of the pedestal, is 20 m.
- the bumps 52 are sequentially formed on them, so that all the electrodes are formed after the bumps 52 are formed first. Time elapses before the bumps 52 are formed on 51.
- semiconductor chips and semiconductor wafers are heated during bump formation. Since the bonding strength is improved by heating after bump formation, for example, there is a difference between the bonding strength of the first formed bump 52 and the bonding strength of the last formed bump 52. Occurs. Therefore, there is a problem that the bonding strength of each bump 52 in one chip is not uniform. The problem is further exacerbated when the bumps 52 are formed on all the electrodes 51 on the semiconductor wafer.
- both the temperature at the time of forming the bump and the subsequent heating temperature may be controlled relatively coarsely, but G a As, L i T a ⁇ 3, and L i N b
- a compound semiconductor substrate such as O 3 or a quartz substrate
- heating after bump formation can be performed at a temperature exceeding the bump formation temperature. Therefore, heating after bump formation can be performed at a temperature exceeding the undamaged temperature.
- the second embodiment is performed by utilizing the fact that the above-described bonding strength can be increased by the heating temperature and the heating time after the bump is formed.
- the bump strength improving device for improving the non-uniformity of the bonding strength and improving the quality of the semiconductor component as compared with the conventional one is provided.
- the bump strength improving apparatus includes the control device 3 17 and a heating stage provided in a bonding stage 3 16 having the bonding strength improving space 3 16 3.
- the control device 317 controls the heating device to perform heating control based on the bonding strength improvement conditions.
- the heating device 3 16 2 can be heated when forming bumps. This is advantageous in that it can be used for both heating and heating after bump formation.
- the heating device 3162 includes a heater and a heater power supply unit.
- the heating device 3 16 2 and the bonding strength improving space 3 16 3, which is a portion controlled by the heating device 3 16 2, are connected to the bonding stage 3 1
- the configuration provided in 6 is not limited.
- the stage 4 1 4 1 of the leveling device 4 14 corresponding to the leveling stage 3 1 4 1 of the leveling device 3 1 4 is connected to the space 3 1 for improving the bonding strength.
- the stage 4 1 4 1 is provided with the heating device 3 1 6 2, and one or a plurality of bump-formed semiconductors placed on the stage 4 1 4 1 to align the height of the bumps 5 2
- the component may be configured to perform heating control based on the above-described bonding strength improvement conditions. By adopting such a configuration, it is possible to perform heating control based on the above-described bonding strength improvement conditions in parallel with the height alignment operation of the bumps 52, and therefore, it is possible to improve tact.
- the heating device 3 1 6 2 is placed on the storage tray 4 1 5 1 of the finished product storage device 4 15 corresponding to the storage tray 3 15 1 of the finished product storage device 3 15. It is also possible to provide a configuration in which heating control is performed on one or a plurality of bump-formed semiconductor components under the above-mentioned bonding strength improvement conditions. More specifically, as the heating device 3 16 2, for example, a heater is provided on the side surface of the housing constituting the storage tray 4 151, or the tray transport device for moving the storage tray 3 151 A heater is provided in the storage tray, and the heating of the heater is controlled to heat the bump-formed semiconductor component stored in the storage tray 415 or the storage tray 315 under the bonding strength improving conditions. Perform control.
- the inside of the storage tray 4151 and the inside of the storage tray 3151 correspond to the space 316 for improving the bonding strength.
- the bonding strength is improved while the bump-formed semiconductor component is stored in the storage tray 415, which is also advantageous in terms of tact.
- a new heating stage 480 is provided in the bump forming apparatus, and one or a plurality of bumped semiconductor components are placed on the heating stage 480, and It is also possible to adopt a configuration in which heating control is performed on the used semiconductor component based on the above-described bonding strength improvement condition.
- the heating control performed by the control device 3 17 on the heating device 3 16 2 based on the bonding strength improving condition will be described.
- the above-mentioned bonding strength improvement conditions are based on the material and size of the electrode 51, the material and size of the bump 52, and the semiconductor chip and the semiconductor wafer.
- the temperature and time for heating the bumped semiconductor chip / bumped semiconductor wafer corresponding to the bumped semiconductor component are determined for each of the material and size of the semiconductor substrate to be formed or for a combination thereof. It is a condition to be a variable.
- the heating temperature and the time are controlled in advance in the storage unit 3171 of the control device 3117 based on the bonding strength improving conditions described above with reference to FIGS. 52 to 54. It stores a program for improving the bonding strength.
- the program may not be stored in the storage unit 3171 in advance, and may be read from a recording medium such as a CD-ROM in which the above-described bonding strength improvement program is recorded and stored. Alternatively, the information may be stored via a communication line.
- the bonding strength improvement program for example, in the case of a semiconductor chip or a semiconductor wafer made of a Si semiconductor substrate, heating of the semiconductor chip or the semiconductor wafer during the formation of the bump 52 on the bonding stage 3 16 The temperature was about 200 ° C. After the bumps were formed, the temperature for improving the bonding strength of the bumped semiconductor chip mounted on the bonding strength improving space 3166 3 ⁇ Approximately 250 ° C and the heating time is 30 minutes. As described above, when the material of the semiconductor substrate is Si, the temperature at the time of forming the bump and the temperature for improving the bonding strength can be controlled relatively coarsely, and the temperature for improving the bonding strength is lower than the temperature at the time of forming the bump. It can be high, low, or at the same temperature.
- the temperature for forming a bump at the time of forming a bump is 150 ° C.
- the temperature for improving the bonding strength after forming the bump is 200 ° C.
- the heating at the temperature for improving the bonding strength is performed.
- the time is one hour.
- the control device 317 can also perform the following operation control. As described above, in the bonding strength improving space 3163, a plurality of the bump-formed semiconductor chips and the bump-formed semiconductor wafers are arranged, and as described above, the heating time after the bump formation elapses. The joining strength is improved. Therefore, for example, the above-described heating stage 480 will be described as an example with reference to FIG. 58.
- a space 3163 for improving the bonding strength in the heating stage 480 is divided into a plurality of sections in advance, and a heating device 3162 is provided for each section.
- the joint strength improvement space 31 63 is divided into five sections 4801— :! Heating device 3162 for each section 4801-1 to 4801-5 so that heating can be controlled separately for each section 4801-1 to 4801-5 as a heat treatment section.
- — 1 to 31 2-5 are arranged, and temperature measurement sensors 4802-1 to 4802-5, which are thermocouples, for example, measure the temperature of each section 4801-1 to 4801-5.
- the heating devices 3162-1 to 3162-5 and the temperature measurement sensors 4802-1 to 4802-5 are connected to the control device 317.
- control device 317 determines, for each of the sections 4801-1 through 4801-5, the elapsed time after the mounting of the bumped semiconductor chip or the bumped semiconductor wafer and the heating temperature, respectively. Control is performed under the above-mentioned bonding strength improvement conditions so that the above-mentioned bonding strength between the bump-formed semiconductor chip and the bump-formed semiconductor wafer placed in the section 4801-1-4801-5 becomes an appropriate value or more.
- the first circuit part 71-1 to the last circuit part in the circuit part to be each semiconductor chip 60 the first circuit part 71-1 to the last circuit part in the circuit part to be each semiconductor chip 60.
- the control device 317 It is preferable to perform such operation control. That is, in the case of the semiconductor wafer 70 in particular, it takes a relatively long time after the bump 52 is formed on the circuit portion 71-1 and the formation of the bump 52 on the circuit portion 71-n is completed. The heating time after formation differs for each circuit part 71.
- the change in the bonding strength is specifically For example, as shown in Figure 52, conceptually As shown in the bonding strength curve 390 shown in FIG. 60, after the bumps are formed, the heating temperature increases until a certain time elapses, but decreases after the peak value. That is, when the heating after the bump formation is performed more than necessary, the above-described bonding strength is deteriorated. Therefore, heating of the circuit portion 71 on which bumps were initially formed after the bump formation is short or unnecessary, and the circuit portion 71 on which bump formation was performed in the later stage is the same as that of the above-mentioned initial stage.
- Heating for a longer time is possible compared to.
- the bonding strength of the bumps 52 is different in each circuit part 71, the bonding strength of the bumps 52 is improved in all the circuit parts 71 of the semiconductor wafer 70, and the power strength is increased.
- the control device 317 starts forming bumps 52 on the semiconductor wafer 70 first in step (indicated by “S” in the figure) 801. Then, the start time TS at the time of completion and the end time TE when the formation of the bumps 52 on all the electrodes 51 are completed are measured and stored. In the next step 802, the wafer transfer device corresponding to the semiconductor chip transfer device 312 uses the bonding stage 316 force to change the bonding strength improvement space 31 in the heating stage 480, for example. A bump-formed semiconductor wafer 70 is placed on 63.
- step 803 the control device 317 determines the above-described bonding strength improvement condition based on the total bump formation time (TE-TS), which is the time obtained by subtracting the start time TS from the end time TE.
- TE-TS total bump formation time
- the heating of the above-mentioned heating device 3 16 2 is controlled based on the obtained and the obtained bonding strength improvement conditions. That is, as shown by the bonding strength curve 390, the change in the bonding strength is known in advance, and the maximum bonding strength value P2 obtained by heating after bump formation is known.
- the controller 317 sets the bonding strength curve 3900 Is determined from T4 and time T1, which are the times at which the minimum bonding strength value P1 passes, that is, the appropriate heating time T during which the bonding strength can be improved by heating after bump formation.
- the control device 317 determines whether or not the heating time T exceeds the total bump forming time (TE-TS), which is the actual time required for forming all the bumps.
- Steps 804 and 805 are executed.
- the control unit 317 obtains the above-mentioned bonding strength improvement condition that can obtain the above-mentioned target value P0 of the bonding strength. Specifically, a time TB during which the bonding strength equal to or greater than the target value P0 is obtained is determined based on the bonding strength curve 390, and a first heating time TOB corresponding to the time TB is determined.
- step 805 the control device 317 controls the heating of the heating device 316 in the above-mentioned first heating time T 0 B under the above-mentioned bonding strength improvement conditions. And heating is performed after the bumps are formed on the bumped semiconductor wafer 70.
- the heating temperature at this time is determined by the controller 317 based on the material of the semiconductor substrate, the material and size of the electrode 51, the material and size of the bump 52, and the like, as described above.
- step 803 if the appropriate heating time T is equal to or less than the total bump forming time (TE-TS) in step 803, in other words, the longest heating after the bump is formed, the first bump is formed.
- the controller 317 obtains a time TA corresponding to the above-mentioned bonding strength improvement condition, which is obtained by subtracting the appropriate heating time T from the total bump formation time (TE-TS), and the control device 317 obtains the time TA. Find the corresponding second heating time TOA.
- step 807 the control device 317 controls the heating of the heating device 316 under the above-mentioned bonding strength improvement conditions, specifically, the second heating time TOA, and performs the bump formation. After the bump formation of the used semiconductor wafer 72, heating is performed. The heating temperature at this time is also determined by the control device 317 based on the material of the semiconductor substrate, the material and size of the electrode 51, the material and size of the bump 52, and the like, as described above.
- step 808 the semiconductor wafer 72 with bumps formed from the bonding strength improving space 316 in the heating stage 480 is transferred to the repeller in the next step by the wafer transfer device. It is transported to the stage of 3.14.
- the above-mentioned bonding strength improvement condition was obtained based on the above-mentioned total bump formation time (TE-TS). However, even if it was not based on the formation time of all the bumps 52, almost all of the bumps 52 could be formed.
- the bonding strength improvement condition may be determined based on the forming time. Here, almost all bumps 52 correspond to bumps 52 that are about 80% or more of all bumps.
- a semiconductor wafer is taken as an example of a semiconductor component to be processed.
- the bonding strength improvement condition is also determined based on the total bump formation time (TE-TS).
- the control method described above can also be applied.
- the control operation of Steps 801 to 808 described above is an operation for uniformly heating the entire bump-formed semiconductor wafer 72, and has been described with reference to FIG.
- the bump-formed semiconductor wafer 72 can also be heated according to the heating control method.
- a first group of circuit portions 71 including a circuit portion 71-1 in which a bump 52 is first formed is arranged in a section 4801-1-1.
- a circuit part 71 of the second group in which the bumps 52 are formed is disposed at a time later than the first group, and the next section 480 01-3 is arranged.
- the third group of circuit portions 71 on which the bumps 52 are formed are disposed at a later time than the second group, and the next section 480 01-14 has a lower position than the third group.
- the fourth group of circuit portions 71 on which the bumps 52 are formed later in time are arranged, and the next section 480 1-5 includes the circuit portion 7 1—n on which the last bumps 52 are formed.
- a fifth group of circuit portions 71 including.
- the heating time after the bump formation by the heating for forming the bumps on the other circuit portions 71 in the bump-formed semiconductor wafer 72 is relatively long.
- Heating device 3 1 6 2-1 provided in section 4 8 0 1-1 where one group of circuit parts 7 1 is arranged is not heated or is heated for a relatively short time Alternatively, heating can be performed at a lower heating temperature than in the other sections 480 1.
- the heating temperature can be sequentially set higher, or the heating time can be set longer, or the heating temperature can be set higher and the heating time can be set longer.
- the bonding strength of the bumps 52 can be improved and made uniform.
- the operation from the loading of the semiconductor component to the storage of the bump-formed part in the finished product storage apparatus 315 will be described.
- the above operation is controlled by the controller 317.
- the semiconductor component takes the above-mentioned semiconductor chip as an example.
- the semiconductor chip 60 is held by the chip holding unit 3 1 2 1 3 provided in the semiconductor chip transfer device 3 1 2, and the chip holding unit 3 1 2 13 is moved by the X-direction moving mechanism 3 1 2 1 1 and the Y-direction moving mechanism 3 1 2 1 2 provided in the semiconductor chip transfer device 3 1 2, and the semiconductor chip 60 is moved on the bonding stage 3 1 6 Placed on
- the semiconductor chip 60 placed on the bonding stage 3 16 is heated to the bump forming temperature, and the bumps 5 2 are formed on the electrodes 51 of the semiconductor chip 60 by the bump forming section 3 13. It is formed.
- the bump-formed semiconductor chip 6 1 on which the bumps 5 2 are formed is placed on the bonding strength improving space 3 16 3 of the bonding stage 3 16 by the chip holding section 3 1 2 13. As described above, the heating after the bump formation is performed under the conditions for improving the bonding strength by the control device 317 as described above.
- the bumped semiconductor chip 61 is again held by the chip holding portion 3112, and placed on the leveling stage 3114 of the leveling device 3114. Is done.
- the mounted bumped semiconductor chip 61 is made uniform in bump height by the leveling device 314.
- the bump-formed semiconductor chip 6 1 having the uniform bump height is again held by the chip holding section 3 1 2 13 and transported to the storage tray 3 15 1 of the finished product storage device 3 15. Is stored.
- a plurality of bumped semiconductor chips 61 can be placed on the bonding stage 3 16 and the bonding strength improving space 3 16 3.
- the bumps are already formed when bumps are formed in 3 16
- the bonding strength has already been improved before transferring the semiconductor chip 6 1 to the bonding strength improving space 3 16 3 or starting heating under the bonding strength improving conditions, or almost simultaneously.
- the pump-formed semiconductor chip 61 heated under the conditions can be transferred to the leveling device 314. By this operation, the tact can be improved.
- the bump strength improving device is provided in the bump forming device 301 as an example.
- the present invention is not limited to this. Even if the bump strength improving device having the above-mentioned bonding stage 3 16 having the above-mentioned control device 3 17 and the above-mentioned heating device 3 16 2 can be configured separately and independently. Good.
- the bump-formed semiconductor chip 61 and the bump-formed semiconductor wafer 72 on which the bumps 52 are already formed are carried into the independent bump strength improving device.
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- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Computer Hardware Design (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Power Engineering (AREA)
- Physics & Mathematics (AREA)
- Condensed Matter Physics & Semiconductors (AREA)
- General Physics & Mathematics (AREA)
- Wire Bonding (AREA)
- Electric Connection Of Electric Components To Printed Circuits (AREA)
Description
Claims
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP01945693A EP1313139A4 (en) | 2000-07-04 | 2001-06-29 | BURST TRAINING DEVICE AND METHOD |
KR1020027018034A KR100554882B1 (ko) | 2000-07-04 | 2001-06-29 | 범프 형성장치 및 방법 |
US10/332,026 US6910613B2 (en) | 2000-07-04 | 2001-06-29 | Device and method for forming bump |
US11/114,084 US7350684B2 (en) | 2000-07-04 | 2005-04-26 | Apparatus and method for forming bump |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2000-202700 | 2000-07-04 | ||
JP2000202700A JP4456234B2 (ja) | 2000-07-04 | 2000-07-04 | バンプ形成方法 |
Related Child Applications (2)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US10332026 A-371-Of-International | 2001-06-29 | ||
US11/114,084 Division US7350684B2 (en) | 2000-07-04 | 2005-04-26 | Apparatus and method for forming bump |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2002003447A1 true WO2002003447A1 (fr) | 2002-01-10 |
Family
ID=18700192
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP2001/005609 WO2002003447A1 (fr) | 2000-07-04 | 2001-06-29 | Dispositif et procede de formation de bosse |
Country Status (6)
Country | Link |
---|---|
US (2) | US6910613B2 (ja) |
EP (1) | EP1313139A4 (ja) |
JP (1) | JP4456234B2 (ja) |
KR (1) | KR100554882B1 (ja) |
CN (2) | CN1222026C (ja) |
WO (1) | WO2002003447A1 (ja) |
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JP4456234B2 (ja) * | 2000-07-04 | 2010-04-28 | パナソニック株式会社 | バンプ形成方法 |
JP4615117B2 (ja) * | 2000-11-21 | 2011-01-19 | パナソニック株式会社 | 半導体ウエハへのバンプ形成方法及びバンプ形成装置 |
JP4130167B2 (ja) * | 2003-10-06 | 2008-08-06 | 日東電工株式会社 | 半導体ウエハの剥離方法 |
US7431192B2 (en) | 2005-01-04 | 2008-10-07 | Kulicke And Soffa Industries, Inc. | Wire bonding apparatus |
KR100808106B1 (ko) | 2006-05-16 | 2008-02-29 | 오태성 | 반도체 칩 또는 반도체 칩 웨이퍼에 형성한 박막히터를이용한 솔더범프 형성방법과 그 장치 |
KR100808108B1 (ko) | 2006-06-25 | 2008-02-29 | 오태성 | 반도체 칩에 형성한 박막히터를 이용한 반도체 칩의 플립칩실장 방법과 탈착 방법 |
JP2008016668A (ja) * | 2006-07-06 | 2008-01-24 | Shinko Electric Ind Co Ltd | 半導体装置の製造方法 |
JP4810393B2 (ja) * | 2006-10-27 | 2011-11-09 | 富士通株式会社 | 光モジュール製造方法及び製造装置 |
JP5120917B2 (ja) * | 2006-11-30 | 2013-01-16 | 独立行政法人産業技術総合研究所 | 半導体装置及びその製造方法 |
JP5218097B2 (ja) * | 2009-01-27 | 2013-06-26 | 千住金属工業株式会社 | 自動はんだ付け装置及び搬送装置 |
JP5091296B2 (ja) * | 2010-10-18 | 2012-12-05 | 東京エレクトロン株式会社 | 接合装置 |
CN102110634B (zh) * | 2010-11-22 | 2012-04-11 | 沈阳芯源微电子设备有限公司 | 可旋转加热的吸附装置 |
KR102020001B1 (ko) | 2011-10-21 | 2019-09-09 | 루미리즈 홀딩 비.브이. | 슬롯을 낸 기판들을 사용한 저 뒤틀림의 웨이퍼 접합 |
CN109623078B (zh) * | 2019-01-20 | 2023-09-12 | 巨力自动化设备(浙江)有限公司 | 三项端子焊接机 |
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Also Published As
Publication number | Publication date |
---|---|
US20050191838A1 (en) | 2005-09-01 |
EP1313139A4 (en) | 2006-01-18 |
CN100383915C (zh) | 2008-04-23 |
JP2002026051A (ja) | 2002-01-25 |
EP1313139A1 (en) | 2003-05-21 |
JP4456234B2 (ja) | 2010-04-28 |
CN1838380A (zh) | 2006-09-27 |
CN1440568A (zh) | 2003-09-03 |
CN1222026C (zh) | 2005-10-05 |
US7350684B2 (en) | 2008-04-01 |
US6910613B2 (en) | 2005-06-28 |
KR100554882B1 (ko) | 2006-02-24 |
KR20030019474A (ko) | 2003-03-06 |
US20040102030A1 (en) | 2004-05-27 |
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