MANUFACTURING APPARATUS AND MANUFACTURING METHOD OF SEMICONDUCTOR DEVICE
20220319891 · 2022-10-06
Assignee
Inventors
Cpc classification
H01L21/6838
ELECTRICITY
H01L21/67144
ELECTRICITY
H01L2224/75
ELECTRICITY
H01L21/50
ELECTRICITY
International classification
Abstract
A manufacturing apparatus of a semiconductor device includes a stage, a bonding head, a copying mechanism mounted on the bonding head, and a controller executing adjustment processing. In the adjustment processing, the controller causes a facing surface of the bonding head to abut against a reference surface of the stage after setting the copying mechanism to a locked state, then presses the facing surface against the reference surface after switching the copying mechanism to a free state, and after that, switches the copying mechanism to the locked state.
Claims
1. A manufacturing apparatus of a semiconductor device, comprising: a stage, having a mounting surface on which a substrate is mounted; a bonding head, having a holding surface sucking and holding a chip, movable relative to the stage in a plane direction and a normal direction of the stage; a copying mechanism, having a first spherical surface and a second spherical surface provided swingably with respect to the first spherical surface, mounted on the stage or the bonding head, wherein the copying mechanism causes a facing surface being the mounting surface or the holding surface and connected to the second spherical surface to swing with respect to a reference surface facing the facing surface and being the holding surface or the mounting surface, and is switchable between a free state in which swinging of the facing surface is enabled and a locked state in which swinging of the facing surface is restricted; and a controller, executing adjustment processing once or more times and adjusting the facing surface to be parallel to the reference surface, wherein in the adjustment processing, the facing surface is caused to directly or indirectly abut against the reference surface after the copying mechanism is set to the locked state, then the copying mechanism is switched to the free state and the facing surface is directly or indirectly pressed against the reference surface, and then the copying mechanism is switched to the locked state.
2. The manufacturing apparatus of a semiconductor device according to claim 1, wherein the controller repeats the adjustment processing until a pressing position being an axial position of the bonding head when the facing surface is pressed against the reference surface in the adjustment processing reaches a specified reference value.
3. The manufacturing apparatus of a semiconductor device according to claim 1, wherein the controller stores an axial position of the bonding head when the facing surface is pressed against the reference surface as a pressing position; the controller repeats the adjustment processing until a change amount between the pressing position obtained by a previous pressing and the pressing position obtained by a current pressing reaches a specified reference value.
4. The manufacturing apparatus of a semiconductor device according to claim 1, wherein the copying mechanism is mounted on the stage; the controller presses the holding surface being the reference surface against an intersection of the mounting surface being the facing surface and a normal of the mounting surface passing through a swing center of the copying mechanism in the adjustment processing.
5. The manufacturing apparatus of a semiconductor device according to claim 1, wherein the controller also executes initial processing prior to the adjustment processing; the controller causes the facing surface to directly or indirectly abut against the reference surface after setting the copying mechanism to the free state, then directly or indirectly presses the facing surface against the reference surface, and then switches the copying mechanism to the locked state in the initial processing.
6. A manufacturing method of a semiconductor device, manufacturing a semiconductor device by bonding a chip sucked and held by a holding surface of a bonding head having a copying mechanism to a substrate mounted on a stage, wherein the stage or the bonding head is equipped with the copying mechanism, the copying mechanism having a first spherical surface and a second spherical surface provided swingably with respect to the first spherical surface, the copying mechanism causing a facing surface being a mounting surface or the holding surface to swing with respect to a reference surface facing the facing surface and being the holding surface or the mounting surface, wherein the copying mechanism is switchable between a free state in which swinging of the facing surface is enabled and a locked state in which swinging of the facing surface is restricted; an adjustment step is comprised to perform: causing the facing surface to directly or indirectly abut against the reference surface after setting the copying mechanism to the locked state, then switching the copying mechanism to the free state and directly or indirectly pressing the facing surface against the reference surface, and switching the copying mechanism to the locked state; the adjustment step is performed once or more times and the facing surface is adjusted to be parallel to the reference surface.
Description
BRIEF DESCRIPTION OF THE DRAWINGS
[0015]
[0016]
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[0018]
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[0022]
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[0027]
DESCRIPTION OF THE EMBODIMENTS
[0028] Hereinafter, a configuration of a manufacturing apparatus 10 of a semiconductor device will be described with reference to the drawings.
[0029] The stage 12 is able to suck and hold the substrate 100, and a heater (not shown) for heating the substrate 100 is mounted inside the stage 12. Heating and suction of the stage 12 are controlled by a controller 34 to be described later. An upper surface of the stage 12 functions as a mounting surface 18 on which the substrate 100 is mounted. The stage 12 of this example is a fixed stage whose vertical and horizontal positions do not change. However, in some cases, the stage 12 may be movable in at least one of the vertical direction and the horizontal direction.
[0030] The bonding head 14 is disposed facing the stage 12 and is movable in the horizontal direction and the vertical direction with respect to the stage 12. In order to realize the movement of the bonding head 14, a movement mechanism 26 is provided. The movement mechanism 26 includes, for example, a drive source such as a motor or a hydraulic cylinder, and a linear motion mechanism or a transmission mechanism such as a gear that transmits movement of the drive source to the bonding head 14. Driving of the movement mechanism 26 is controlled by the controller 34.
[0031] The bonding head 14 is able to suck and hold the semiconductor chip 102 at a holding surface 20 being a tip surface of the bonding head 14. Hence, a suction hole (not shown) for sucking and holding the semiconductor chip 102 is formed at a tip part of the bonding head 14, and the suction hole is connected to a vacuum source 30 via an air pipe 31. A heater 24 for heating the semiconductor chip 102 being held is built in the tip part of the bonding head 14. The heater 24 is controlled by a heater drive part 28.
[0032] After the bonding head 14 has sucked and held the semiconductor chip 102 by the holding surface 20, by mounting the semiconductor chip 102 on a surface of the substrate 100 and performing heating and pressurization thereon, the semiconductor chip 102 is bonded to the substrate 100. Here, in recent years, semiconductor devices have been highly integrated due to the miniaturization of semiconductor processes. In order to enable such high integration, it is necessary to maintain the degree of parallel between the substrate 100 and the semiconductor chip 102 bonded to the substrate 100 with high accuracy. Conventionally, as a means of such parallel adjustment, a manual angle adjustment device called a goniometer stage or a method of adjusting tilting by sandwiching a shim has been proposed. However, such conventional parallel adjustment means require high skill and a large amount of adjustment time.
[0033] Therefore, the bonding head 14 of this example is equipped with a copying mechanism 22 in order to enable parallel adjustment by a simple procedure. The copying mechanism 22 is a pneumatic device having a spherical aerostatic bearing 44 (see
[0034]
[0035] The movable member 42 is held so as to be three-dimensionally swingable with respect to the fixed member 40. A lower end of the movable member 42 is fixed to the lower part 14d of the bonding head 14, and the movable member 42 is swingable together with the holding surface 20. An upper surface of the movable member 42 is a convex hemispherical surface corresponding to the concave hemispherical surface of the fixed member 40. The holder 43 holds the movable member 42 so as not to interfere with swinging of the movable member 42.
[0036] In such a copying mechanism 22, by ejecting compressed air from the concave hemispherical surface of the fixed member 40, the movable member 42 is separated from the fixed member 40 and is supported in a non-contact state. Accordingly, sliding resistance of the movable member 42 is significantly reduced, and it is possible to perform a precise rotational movement with an extremely light force. By stopping the supply of compressed air and vacuum-sucking the movable member 42, the movable member 42 can be fixed in a predetermined posture. In the following, a state in which compressed air is ejected and swinging of the movable member 42 is allowed is referred to as a “free state”, and a state in which the movable member 42 is vacuum-sucked and swinging of the movable member 42 is restricted is referred to as a “locked state”.
[0037] Switching of the copying mechanism 22 between the free state and the locked state is performed by the copying mechanism drive part 32. The copying mechanism drive part 32 includes a compressor for supplying compressed air, a vacuum source for vacuum suction, and the like. Driving of the copying mechanism drive part 32 is controlled by the controller 34.
[0038] The controller 34 controls driving of each part of the manufacturing apparatus 10. Specifically, the controller 34 drives the movement mechanism 26, or the heater drive part 28, the vacuum source 30 or the like to execute implementation processing for bonding the semiconductor chip 102 to the substrate 100. The controller 34 of this example also executes, prior to the implementation processing, copying processing for making the holding surface 20 copy the mounting surface 18 and thereby adjusting the holding surface 20 and the mounting surface 18 to be parallel. In the following, among the holding surface 20 and the mounting surface 18, the holding surface 20 being a swingable surface is referred to as a “facing surface 50”, and the mounting surface 18 being a fixed surface is referred to as a “reference surface 110”.
[0039] Such a controller 34 is a computer including a processor executing various operations and a memory storing data and programs. The controller 34 of this example executes, prior to the implementation processing of the semiconductor chip 102, the copying processing for adjusting the facing surface 50 to be parallel to the reference surface 110. Hereinafter, this copying processing will be described.
[0040]
[0041] In recent years, it has been proposed to use the copying mechanism 22 in order to correct such tilting. Specifically, it has been proposed to perform parallel adjustment on the facing surface 50 by pressing the facing surface 50 against the reference surface 110 after the copying mechanism 22 is set to the free state. In the free state, the movable member 42 can be swung by an extremely small force. Therefore, in theory, if the facing surface 50 is pressed against the reference surface 110, the movable member 42 swings until achieving a state in which the entire facing surface 50 is in contact with the reference surface 110, in other words, a state in which the facing surface 50 is completely parallel to the reference surface 110. At the moment when parallel is achieved, if the copying mechanism 22 is switched to the locked state and swinging of the movable member 42 is restricted, the degree of parallel of the facing surface 50 with respect to the reference surface 110 can be maintained with high accuracy.
[0042] However, in reality, tilting of the facing surface 50 cannot be completely eliminated only by causing the facing surface 50 to abut against the reference surface 110, and a parallel offset may remain. In a case where the copying mechanism 22 is locked with the parallel offset remaining, the degree of parallel of the facing surface 50 with respect to the reference surface 110 cannot be maintained with high accuracy.
[0043] A reason why such a parallel offset remains is that a force that causes the movable member 42 to swing and frictional force between the facing surface 50 and the reference surface 110 are balanced with each other. That is, when the facing surface 50 is pressed against the reference surface 110, the movable member 42 swings. However, at this time, a contact point P of the facing surface 50 with the reference surface 110 slides in an outward direction (direction of arrow B in
[0044] Here, immediately after the facing surface 50 abuts against the reference surface 110, in the case where the tilting of the facing surface 50 with respect to the reference surface 110 is small, a movement amount of the contact point P required to achieve a completely parallel state is reduced. Hence, in this case, there is a possibility that the facing surface 50 may be able to be completely parallel to the reference surface 110 before the frictional force and the swinging force are balanced with each other. However, generally, an electrical wire or the air pipes 31 and 47 are connected to the movable member 42 and the lower part 14d of the bonding head 14. Hence, in the case where the copying mechanism 22 is set to free while the facing surface 50 and the reference surface 110 are separated from each other, as shown in the left figure of
[0045] That is, it is difficult to make the facing surface 50 completely parallel to the reference surface 110 simply by pressing the facing surface 50 against the reference surface 110 after the copying mechanism 22 is switched to the free state. Therefore, in this example, the pressing operation of the facing surface 50 against the reference surface 110 is configured to be performed repeatedly. This is described with reference to
[0046] The copying processing of this example includes initial processing and adjustment processing. The initial processing is a processing that is executed only once at the beginning of the copying processing. On the other hand, the adjustment processing is a processing that is executed once or multiple times after the initial processing.
[0047] The initial processing is almost the same as conventional copying processing. That is, in the initial processing, as shown in
[0048] In this state, the bonding head 14 is lowered, and the facing surface 50 is pressed against the reference surface 110 with a predetermined load. After that, as shown in
[0049] When the above initial processing is completed, the adjustment processing is subsequently executed. In the adjustment processing, the facing surface 50 is pressed against the reference surface 110 while the tilting of the facing surface 50 obtained by the initial processing or the previous adjustment processing is maintained. Specifically, the copying mechanism 22 is in the locked state at the step when the initial processing or the previous adjustment processing is completed. As shown in
[0050] In the copying processing of this example, the above adjustment processing is executed once or multiple times. Here, as is clear from the foregoing description, in the adjustment processing, the tilting of the facing surface 50 at the start of pressing of the facing surface 50 against the reference surface 110 is maintained to be the tilting of the facing surface 50 obtained by the initial processing or the previous adjustment processing. In other words, in the adjustment processing, when the facing surface 50 is pressed against the reference surface 110, the tilting of the facing surface 50 is already eliminated to some extent. Since the pressing of the facing surface 50 against the reference surface 110 is started in the state in which the tilting of the facing surface 50 is eliminated to some extent, the facing surface 50 is able to be closer to the completely parallel state than in the initial processing or the previous adjustment processing. That is, by executing once or more times the adjustment processing for pressing the facing surface 50 against the reference surface 110 while maintaining the tilting of the facing surface 50 obtained by the previous initial processing or adjustment processing, the facing surface 50 is able to be relatively reliably parallel to the reference surface 110.
[0051] The number of times of execution of the adjustment processing may be specified in advance. Alternatively, the adjustment processing may be repeated until it can be determined that the facing surface 50 is sufficiently parallel to the reference surface 110. The determination that a sufficiently parallel state is achieved may be made based on, for example, a pressing position Pp[i] being the axial position Pz of the bonding head 14 when the facing surface 50 is pressed against the reference surface 110. For example, the axial position Pz when the facing surface 50 is sufficiently parallel can be inferred to some extent from a past measurement or an arrangement of the stage 12 and the bonding head 14. Therefore, the axial position Pz when the facing surface 50 is sufficiently parallel is inferred as a reference position Pdef, and the adjustment processing may be repeated until the pressing position Pp[i] obtained by the actual adjustment processing reaches the reference position Pdef. In the case where the facing surface 50 is sufficiently parallel to the reference surface 110, even if the facing surface 50 is pressed against the reference surface 110, the axial position Pz[i] of the bonding head 14 does not change. Therefore, the adjustment processing may be repeated until a change amount between a pressing position Pp[i−1] obtained by the previous initial processing or adjustment processing and the pressing position Pp[i] obtained by the current adjustment processing becomes less than the specified reference value. In any case, by executing the adjustment processing once or more times, the facing surface 50 is able to be relatively reliably parallel to the reference surface 110.
[0052] Next, a flow of the copying processing will be described with reference to
[0053] When the facing surface 50 abuts against the reference surface 110 as a result of the lowering (Yes in S16), the controller 34 drives the movement mechanism 26 to press the facing surface 50 against the reference surface 110 with a predetermined load (S18). Accordingly, the movable member 42 receives the reaction force from the reference surface 110 and swings in the direction of eliminating tilting. However, as the pressing progresses, the frictional force between the facing surface 50 and the reference surface 110 increases, and is balanced with the force that causes the movable member 42 to swing. In this case, swinging of the movable member 42 is stopped while the tilting of the facing surface 50 with respect to the reference surface 110 remains. The controller 34 stores the axial position Pz of the bonding head 14 at the moment when the pressing operation is completed as the pressing position Pp[i].
[0054] If the facing surface 50 can be pressed with the predetermined load, the controller 34 subsequently drives the copying mechanism drive part 32 to switch the copying mechanism 22 to the locked state (S20). Then, if the bonding head 14 is lifted to a height away from the mounting surface 18 (S22), the initial processing is ended.
[0055] If the initial processing is ended, as shown in
[0056] When the facing surface 50 abuts against the reference surface 110 as a result of the lowering (Yes in S36), the controller 34 drives the copying mechanism drive part 32 to switch the copying mechanism 22 from the locked state to the free state (S38). Accordingly, swinging of the movable member 42 is allowed. Here, at this time, since a part of the facing surface 50 has already abutted against the reference surface 110, even if the dead weight of a pipe or the like is provided, the movable member 42 is unable to swing in a direction in which tilting of the facing surface 50 increases. Therefore, tilting of the facing surface 50 immediately after switching to the free state is tilting at the moment when the previous pressing operation is ended.
[0057] When the copying mechanism 22 changes to the free state, the controller 34 drives the movement mechanism 26 to press the facing surface 50 against the reference surface 110 with the predetermined load (S40). Accordingly, the movable member 42 receives the reaction force from the reference surface 110 and swings in the direction of eliminating tilting of the facing surface 50. When the completely parallel state is achieved or the frictional force with the reference surface 110 is balanced with the force that causes the movable member 42 to swing, swinging of the movable member 42 is stopped. The controller 34 stores the axial position Pz of the bonding head 14 at the moment when the pressing operation is completed as the pressing position Pp[i].
[0058] If the facing surface 50 can be pressed with the predetermined load, the controller 34 subsequently switches the copying mechanism 22 to the locked state (S42). Accordingly, the tilting of the facing surface 50 obtained by the current pressing operation is maintained. Then, if the bonding head 14 is lifted to the height away from the mounting surface 18 (S44), the adjustment processing is ended.
[0059] Referring again to
[0060] As is clear from the above description, in this example, the adjustment processing for performing the current pressing operation is executed once or more times from the state in which the tilting obtained by the previous pressing operation is maintained. As a result, since tilting of the facing surface 50 can be gradually reduced, the facing surface 50 is able to be relatively reliably parallel to the reference surface 110.
[0061] In the above description, the copying mechanism 22 is mounted on the bonding head 14. However, as shown in
[0062] In the foregoing description, the facing surface 50 is directly pressed against the reference surface 110. However, the facing surface 50 may be indirectly pressed against the reference surface 110. For example, in the case where the bonding head 14 is equipped with the copying mechanism 22, a chip member may be held by the holding surface 20 being the facing surface 50, and the chip member may be pressed against the reference surface 110. In this case, the substrate 100 is supported by the mounting surface 18 being the reference surface 110, and the facing surface 50 or the chip member held by the facing surface 50 may be pressed against the substrate 100.
[0063] In the foregoing description, the initial processing is executed before the adjustment processing. However, the initial processing may be omitted. That is, it is possible to only execute the processing of
DESCRIPTION OF REFERENCE NUMERALS
[0064] 10: manufacturing apparatus; 12: stage; 14: bonding head; 18: mounting surface; 20: holding surface; 22: copying mechanism; 24: heater; 26: movement mechanism; 28: heater drive part; 30: vacuum source; 31, 47: air pipe; 32: copying mechanism drive part; 34: controller; 40: fixed member; 42: movable member; 43: holder; 44: spherical aerostatic bearing; 46: air passage; 50: facing surface; 100: substrate; 102: semiconductor chip; 110: reference surface.