WO2021024770A1 - 基板処理方法、及び基板処理装置 - Google Patents
基板処理方法、及び基板処理装置 Download PDFInfo
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- WO2021024770A1 WO2021024770A1 PCT/JP2020/028011 JP2020028011W WO2021024770A1 WO 2021024770 A1 WO2021024770 A1 WO 2021024770A1 JP 2020028011 W JP2020028011 W JP 2020028011W WO 2021024770 A1 WO2021024770 A1 WO 2021024770A1
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Definitions
- This disclosure relates to a substrate processing method and a substrate processing apparatus.
- the method for dividing a semiconductor wafer described in Patent Document 1 includes an integration process, a polishing process, a division process, and a pickup process.
- the integration step the surface of the semiconductor wafer is made to face the upper surface of the support substrate that supports the semiconductor wafer, and the semiconductor wafer and the support substrate are integrated via an adhesive.
- the polishing process the back surface of the semiconductor wafer integrated with the support substrate is polished.
- the semiconductor wafer integrated with the support substrate is divided into individual semiconductor chips from the back surface side.
- the pick-up process the semiconductor chip is picked up from the support substrate.
- the adhesive Prior to picking up, the adhesive is given an external stimulus such as ultraviolet light to reduce its adhesive strength.
- One aspect of the present disclosure provides a technique capable of suppressing deterioration of a chip device when irradiated with a light beam that reduces the adhesive force before pickup.
- the substrate processing method is A first substrate divided into a plurality of chips, a protective film that has been divided for each chip and protects the chips, a second substrate that supports the first substrate, the protective film, and the second substrate.
- a laminated substrate including an adhesive film to adhere to and The light rays that pass through the second substrate reduce the adhesive strength of the adhesive film, and The protective film and the chip whose adhesive force with the adhesive film is reduced are picked up from the adhesive film by the pick-up unit. Have.
- deterioration of the chip device can be suppressed when a light beam that reduces the adhesive force is irradiated before pickup.
- FIG. 1 is a flowchart showing a substrate processing method according to an embodiment.
- 2 (A) is a diagram showing S101 of FIG. 1
- FIG. 2 (B) is a diagram showing S102 of FIG. 1
- FIG. 2 (C) is a diagram showing S103 of FIG. 3A is a diagram showing S104 of FIG. 1
- FIG. 3B is a diagram showing S105 of FIG. 1
- FIG. 3C is a diagram showing S106 of FIG.
- FIG. 4 is a plan view showing an example of the first main surface of the first substrate before division.
- FIG. 5 is a plan view showing a substrate processing apparatus according to an embodiment.
- FIG. 6 is a flowchart showing a first example of the process performed before S101 in FIG. 7 (A) shows S201 of FIG. 6, FIG.
- FIG. 7 (B) shows S202 of FIG. 6,
- FIG. 7 (C) shows S203 of FIG. 6,
- FIG. 7 (D) shows FIG.
- S204 of. 8 (A) is a diagram showing S205 of FIG. 6,
- FIG. 8 (B) is a diagram showing S206 of FIG. 6,
- FIG. 8 (C) is a diagram showing S207 of FIG.
- FIG. 10 (B) is a diagram showing S306 of FIG. 9,
- FIG. 10 (C) is a diagram showing S307 of FIG. 9, and
- FIG. 10 (D) is FIG. It is a figure which shows S308 of.
- FIG. 11 is a flowchart showing a third example of the process performed before S101 in FIG.
- FIG. 12 is a diagram showing S407 of FIG.
- FIG. 13 is a flowchart showing a fourth example of the process performed before S101 in FIG. 14 (A) is a diagram showing S503 of FIG. 13,
- FIG. 14 (B) is a diagram showing S504 of FIG. 13, and
- FIG. 14 (C) is a diagram showing S505 of FIG.
- the same or corresponding configurations may be designated by the same reference numerals and description thereof may be omitted.
- the X-axis direction, the Y-axis direction, and the Z-axis direction are perpendicular to each other.
- the X-axis direction and the Y-axis direction are the horizontal direction, and the Z-axis direction is the vertical direction.
- the substrate processing methods include preparation of a laminated substrate (S101), reduction of adhesive strength (S102), chip pickup (S103), removal of a protective film (S104), and chip surface surface. It has activation (S105) and bonding of the chip and the third substrate (S106).
- the substrate processing method may include processing other than the processing shown in FIG. The process performed before the preparation of the laminated substrate (S101) will be described later.
- the laminated substrate 50 including the first substrate 10, the protective film 20, the second substrate 30, and the adhesive film 40 is prepared.
- Preparation of the laminated substrate 50 includes, for example, holding the laminated substrate 50 on the first holding table 110.
- the first holding table 110 holds the laminated substrate 50 from below with the second main surface 12 of the first substrate 10 facing upward.
- the first substrate 10 includes a first main surface 11 and a second main surface 12 opposite to the first main surface 11.
- the first substrate 10 includes a base substrate 13 which is a semiconductor substrate such as a silicon wafer or a glass substrate, and a device 14 formed on the surface of the base substrate 13.
- the first substrate 10 has been divided into a plurality of chips 15.
- Each of the plurality of chips 15 includes a device 14.
- the number of chips 15 is not particularly limited.
- FIG. 2 shows a smaller number of chips 15 than in FIG. 4 due to space limitations.
- the first main surface 11 of the first substrate 10 before division is divided into a plurality of regions by a plurality of planned division lines 16 intersecting with each other.
- Devices 14 such as semiconductor elements, circuits, and terminals are formed in advance in each of the plurality of regions.
- the first substrate 10 is divided by a plurality of planned division lines 16 and is divided into a plurality of chips 15.
- the protective film 20 protects the first main surface 11 of the first substrate 10 and protects the device 14 of the first main surface 11.
- the protective film 20 is made of, for example, a resin.
- the protective film 20 has been divided at the same position as the first substrate 10, and has been divided for each chip 15.
- the dividing surface of the protective film 20 and the dividing surface of the chip 15 may be located on the same surface.
- the second substrate 30 supports the first substrate 10.
- the second substrate 30 supports the plurality of chips 15 flatly and suppresses the warpage of the chips 15.
- the thickness of the second substrate 30 may be thicker than the thickness of the chip 15.
- the diameter of the second substrate 30 may be equal to or larger than the diameter of the first substrate 10.
- a semiconductor substrate or a glass substrate is used as the second substrate 30, for example.
- the adhesive film 40 adheres the protective film 20 and the second substrate 30.
- the adhesive film 40 is made of, for example, a resin.
- the adhesive film 40 is not particularly limited as long as it reduces the adhesive force by light rays such as infrared rays transmitted through the second substrate 30, but for example, microcapsules that expand or foam by irradiation with light rays or foam by irradiation with light rays. It may contain a foaming agent or the like. Further, the adhesive film 40 may be sublimated by irradiation with light rays.
- the adhesive strength of the adhesive film 40 is reduced by the light rays L1 passing through the second substrate 30.
- the light beam L1 is emitted from the second substrate 30 to the adhesive film 40. Since the intensity of the light ray L1 that hits the device 14 of the first substrate 10 is lower than that of the case where the light ray L1 is irradiated from the first substrate 10 to the adhesive film 40, deterioration of the device 14 can be suppressed.
- the decrease in the adhesive force may be performed on the entire adhesive film 40 at once, or may be performed on each chip 15.
- the first holding table 110 can move in the X-axis direction and the Y-axis direction in order to change the irradiation position of the light beam L1 on the adhesive film 40. It is sufficient that the irradiation position of the light ray L1 on the adhesive film 40 can be changed, and the irradiator 120 that irradiates the light ray L1 may move. Further, when the irradiator 120 includes a galvano scanner or the like, both the first holding table 110 and the irradiator 120 do not have to move.
- the intensity of the light ray L1 decreases when it hits the adhesive film 40. This is because most of the energy of the light beam L1 is used to reduce the adhesive force of the adhesive film 40. However, a part of the light beam L1 can pass through the adhesive film 40 without being absorbed by the adhesive film 40.
- the protective film 20 exists between the adhesive film 40 and the first substrate 10.
- the light ray L1 passes through the protective film 20
- a part of the light ray L1 is absorbed by the protective film 20, and the intensity of the light ray L1 is further reduced.
- the material of the protective film 20 is appropriately selected according to the wavelength of the light beam L1.
- the second substrate 30 is a silicon wafer
- infrared rays are used as the light ray L1 transmitted through the silicon wafer
- the wavelength of the light ray L1 is, for example, 700 nm or more and 1 mm or less.
- the ray L1 may be a laser beam.
- the oscillation method of the laser beam may be either a continuous oscillation type or a pulse oscillation type.
- a semiconductor laser, a YAG laser, or a carbon dioxide gas laser is used as the light source of the laser beam.
- the material of the first holding table 110 may be glass.
- the first holding base 110 may be configured so as not to be hit by the light beam L1, and may hold only the outer periphery of the laminated substrate 50, for example.
- the material of the first holding table 110 is not limited to glass, and may be metal or ceramic.
- the protective film 20 and the chip 15 having reduced adhesive force with the adhesive film 40 are picked up from the adhesive film 40 by the pickup unit 130.
- the pickup unit 130 attracts the chip 15 from above.
- the size of the suction surface of the pickup unit 130 is the same as or slightly larger than the size of the upper surface of the chip 15.
- the pickup unit 130 is, for example, a collet.
- the chip 15 is supported by a rigid second substrate 30 until it is picked up by the pickup unit 130.
- a soft tape such as a so-called dicing tape instead of the second substrate 30
- the protective film 20 is immersed in the liquid L2 that dissolves the protective film 20 while the chip 15 is held by the pickup unit 130, and the protective film 20 is removed. 20 is removed. Since the protective film 20 is dissolved and removed, particles attached to the protective film 20 can also be removed.
- the liquid L2 is appropriately selected according to the material of the protective film 20, but may be, for example, an organic solvent.
- the liquid L2 is stored in advance in the tank of the storage unit 140.
- the storage unit 140 is, for example, a container opened upward.
- the pickup unit 130 does not have to be immersed in the liquid L2. Deterioration of the pickup unit 130 can be suppressed.
- the pickup unit 130 After picking up the chip 15 (S103), the pickup unit 130 continues to hold the chip 15 from above with the protective film 20 facing down at least until the protective film 20 is removed (S104). When the protective film 20 is immersed in the liquid L2, the pickup unit 130 does not have to be immersed in the liquid L2. Further, since the chip 15 is not delivered between the pickup unit 130 and another pickup unit, cracking of the chip 15 that may occur at the time of delivery can be prevented.
- the surface 15a from which the protective film 20 of the chip 15 has been removed is activated while the chip 15 is held by the pickup unit 130.
- the surface 15a of the chip 15 is the first main surface 11 of the first substrate 10, and the device 14 is present on the surface 15a of the chip 15. Since the surface of the device 14 is activated, it can be bonded to the main surface 61 on which the device 64 of the third substrate 60 described later is formed.
- the activating unit 150 activates the surface 15a of the chip 15.
- the activating unit 150 is, for example, a plasma generator, which activates the surface 15a of the chip 15 by the generated plasma.
- the plasma may be atmospheric pressure plasma or vacuum plasma, but may be atmospheric pressure plasma that does not require a vacuum vessel.
- Plasma is generated by exciting, for example, oxygen gas or nitrogen gas.
- the plasma for example, cleaves the chemical bonds of molecules on the surface 15a (eg, SiO 2 ) to form functional groups or unbonded hands.
- the activating unit 150 may treat the surface 15a of the chip 15 with plasma and then treat it with pure water to make the surface 15a of the chip 15 hydrophilic.
- the pickup unit 130 After picking up the chip 15 (S103), the pickup unit 130 continues to hold the chip 15 from above with the protective film 20 facing down at least until the chip surface is activated (S105). Since the chip 15 is not delivered between the pickup unit 130 and another pickup unit, cracking of the chip 15 that may occur at the time of delivery can be prevented.
- the activated surface 15a of the chip 15 is pressed on the activated surface 15a of the chip 15 while the chip 15 is held by the pickup unit 130.
- the device 64 is faced with and joined to the main surface 61 on which the device 64 is formed.
- the device 14 on the surface 15a of the chip 15 and the device 64 on the main surface 61 of the third substrate 60 are joined to obtain a third substrate 60 with the chip 15.
- the third substrate 60 with the chip 15 may be a so-called COW (Chip On Wafer).
- the second holding table 160 holds the third substrate 60 from below with the main surface 61 of the third substrate 60 facing upward.
- the pickup unit 130 holds the chip 15 from above with the activated surface 15a of the chip 15 facing downward. After picking up the chip 15 (S103), the pickup unit 130 continues to hold the chip 15 from above with the surface 15a of the chip 15 facing down until the chip 15 and the third substrate 60 are joined (S106). Since the chip 15 is not delivered between the pickup unit 130 and another pickup unit, cracking of the chip 15 that may occur at the time of delivery can be prevented.
- the bonding between the chip and the third substrate (S106) is performed, for example, by the substrate processing apparatus 100 shown in FIG.
- the substrate processing device 100 includes a loading / unloading station 170, a processing station 180, and a control device 190.
- the loading / unloading station 170 and the processing station 180 are arranged in this order from the negative side in the X-axis direction to the positive side in the X-axis direction.
- the carry-in / out station 170 has a carry-in / out block 171 and a transport block 172.
- the transport block 172 is arranged next to the carry-in / out block 171 and is arranged on the positive side of the carry-in / out block 171 in the X-axis direction, for example. Further, the transport block 172 is arranged next to the processing station 180, for example, on the negative side in the X-axis direction of the processing station 180.
- the carry-in / out block 171 includes a plurality of mounting portions 173 arranged in a row in the Y-axis direction. A cassette is mounted on each of the plurality of mounting portions 173.
- the first cassette C1 accommodates the laminated substrate 50
- the second cassette C2 accommodates the third substrate 60
- the third cassette C3 accommodates the third substrate 60 with the chip 15
- the fourth cassette C4 accommodates the laminated substrate 50.
- the remaining second substrate 30 after picking up the chip 15 and the protective film 20 from the above is accommodated.
- the number of mounting portions 173 is not particularly limited.
- the number of cassettes is not particularly limited.
- a transport device 174 is provided inside the transport block 172.
- the transport device 174 has a holding portion for holding the laminated substrate 50, the third substrate 60, and the like.
- the holding portion can move in the horizontal direction (both directions in the X-axis direction and the Y-axis direction) and in the vertical direction, and can rotate around the vertical axis.
- the transport device 174 takes out the laminated substrate 50 from the first cassette C1 and places it on the first holding table 110. Further, the transfer device 174 takes out the third substrate 60 from the second cassette C2 and places it on the second holding table 160. Further, the transfer device 174 receives the third substrate 60 with the chip 15 from the second holding table 160 and stores it in the third cassette C3. Furthermore, the transfer device 174 receives the remaining second substrate 30 after picking up the chip 15 and the protective film 20 from the laminated substrate 50 from the first holding table 110 and stores them in the fourth cassette C4.
- the processing station 180 has a first holding table 110, an irradiator 120, a pickup unit 130, a moving unit 135, a storage unit 140, an activation unit 150, and a second holding unit 160.
- the first holding table 110, the storage unit 140, the activating unit 150, and the second holding table 160 are arranged in this order from the positive side in the Y-axis direction to the negative side in the Y-axis direction.
- the irradiator 120 is provided below the first holding table 110.
- the pickup unit 130 can move in the horizontal direction (both directions in the X-axis direction and the Y-axis direction) and in the vertical direction, and can turn around the vertical axis.
- the number of pickup units 130 is one in FIG. 4, but may be plural.
- the moving unit 135 moves the pickup unit 130 so as to move the chip 15 held by the pickup unit 130 from the first holding unit 110 to the second holding unit 160 via the storage unit 140 and the activating unit 150.
- the control device 190 is, for example, a computer, and as shown in FIG. 5, includes a CPU (Central Processing Unit) 191 and a storage medium 192 such as a memory.
- the storage medium 192 stores programs that control various processes executed by the substrate processing apparatus 100.
- the control device 190 controls the operation of the substrate processing device 100 by causing the CPU 191 to execute the program stored in the storage medium 192.
- the control device 190 includes an input interface 193 and an output interface 194.
- the control device 190 receives a signal from the outside through the input interface 193 and transmits the signal to the outside through the output interface 194.
- the above program is stored in, for example, a computer-readable storage medium, and is installed from the storage medium in the storage medium 192 of the control device 190.
- Examples of the storage medium that can be read by a computer include a hard disk (HD), a flexible disk (FD), a compact disk (CD), a magnet optical desk (MO), and a memory card.
- the program may be downloaded from the server via the Internet and installed on the storage medium 192 of the control device 190.
- the substrate processing methods include preparation of the first substrate 10 (S201), formation of the protective film 20 (S202), formation of the first groove 71 (S203), protective film 20 and the second. It has adhesion of the substrate 30 (S204), thinning of the first substrate 10 (S205), formation of the mask 72 (S206), and formation of the second groove 73 (S207).
- the first substrate 10 is held by a holding table (not shown). As shown in FIG. 7A, the first substrate 10 is held from below with the first main surface 11 facing upward. A device 14 is already formed on the first main surface 11.
- the protective film 20 is formed on the first main surface 11 of the first substrate 10.
- the protective film 20 is formed by, for example, a spin coating method.
- the nozzle 201 discharges the coating liquid L3 from above with respect to the rotating first substrate 10, and forms a liquid film of the coating liquid L3. When the liquid film is dried, the protective film 20 is obtained.
- the method of applying the coating liquid L3 is not limited to the spin coating method.
- the protective film 20 absorbs the light rays L1 that have passed through the adhesive film 40 in the decrease in adhesive force (S102), and suppresses the deterioration of the device 14.
- the protective film 20 also plays a role of suppressing the debris generated in the formation of the first groove 71 (S203), which will be described later, from adhering to the device 14.
- the first groove 71 deeper than the device 14 is formed on the planned division line on the surface of the protective film 20.
- the first groove 71 reaches the base substrate 13.
- the planned division line on the surface of the protective film 20 coincides with the planned division line 16 on the first main surface 11 of the first substrate 10 in a plan view.
- the position of the planned division line 16 is detected by capturing an image of the first main surface 11 with an infrared camera or the like and performing image processing on the captured image.
- the formation position of the first groove 71 is determined by the position of the detected planned division line 16.
- the first groove 71 may be formed by cutting with a blade, but in the present embodiment, it is formed by ablation with a laser beam L4.
- the ablation process is effective when the device 14 is brittle, for example, when the device 14 contains a porous Low-k material.
- a short pulse laser may be used as the light source of the laser beam L4 in order to prevent the device 14 from overheating.
- the wavelength of the laser beam L4 may be different from the wavelength of the ray L1. This is because the roles of the laser beam L4 and the laser beam L1 are different. As described above, the light beam L1 is used to reduce the adhesive force of the adhesive film 40.
- the wavelength of the laser beam L4 may be shorter than the wavelength of the ray L1, and may be, for example, 600 nm or less.
- the formation of the first groove 71 is performed after the formation of the protective film 20 (S202) and before the adhesion between the protective film 20 and the second substrate 30 (S204). Since the protective film 20 is formed before the formation of the first groove 71, it is possible to suppress the debris generated when the first groove 71 is formed from adhering to the device 14.
- the protective film 20 and the second substrate 30 are adhered by the adhesive film 40. Since the first substrate 10 and the second substrate 30 are adhered by the adhesive film 40, the second substrate 30 can support the first substrate 10.
- the adhesive film 40 is formed by applying an adhesive to the joint surface of the second substrate 30, after which the protective film 20 is placed. It is possible to prevent the first groove 71 on the surface of the protective film 20 from being filled with the adhesive.
- the adhesive film 40 may be supplied in the form of a sheet, and in that case, the adhesive film 40 may be attached to either the protective film 20 or the second substrate 30 first.
- the thinning of the first substrate 10 is performed after the protective film 20 and the second substrate 30 are bonded (S204).
- the thinning of the first substrate 10 includes grinding the second main surface 12 of the first substrate 10, as shown in FIG. 8 (A). After grinding, further polishing may be performed. Since the first substrate 10 is processed in a state where the first substrate 10 is reinforced by the second substrate 30, cracking of the first substrate 10 can be suppressed. Grinding of the first substrate 10 is performed by the grindstone 202. The grindstone 202 descends while rotating, and grinds the upper surface (second main surface 12) of the rotating first substrate 10. Polishing is performed in the same manner. The first groove 71 is not exposed on the second main surface 12 after thinning.
- the formation of the mask 72 is performed after the thinning of the first substrate 10 (S205).
- the mask 72 is formed by a photolithography method or the like, and has an opening 72a at the planned division line of the second main surface 12 of the first substrate 10 as shown in FIG. 8 (B).
- the planned division line of the second main surface 12 and the planned division line 16 of the first main surface 11 coincide with each other in a plan view.
- the position of the planned division line 16 is detected by capturing an image of the first main surface 11 with an infrared camera or the like and performing image processing on the captured image.
- the formation position of the opening 72a of the mask 72 is determined by the position of the detected planned division line 16.
- the material of the mask 72 is not particularly limited as long as it can withstand the etching described later.
- the second main surface 12 of the first substrate 10 is etched at the opening 72a of the mask 72 to connect to the first groove 71.
- the two grooves 73 are formed, and the first substrate 10 is divided into a plurality of chips 15.
- the plurality of chips 15 are flatly supported by the second substrate 30.
- the etching may be either wet etching or dry etching, but may be dry etching having excellent anisotropy, for example, plasma etching.
- the first substrate 10 is divided into a plurality of chips 15 by etching, it is possible to suppress distortion and scratches on the chips 15 when the chips 15 are divided, and it is possible to suppress the generation of particles when the chips 15 are divided. Further, when the second groove 73 is connected to the first groove 71, the side surface 71a of the first groove 71 is also etched, so that distortion, scratches and particles generated during the formation of the first groove 71 can be removed.
- the timing at which the mask 72 is removed may be any time after the formation of the second groove 73 (S207), before the pickup of the chip 15 (S103), or the joining of the chip 15 and the third substrate 60 (S106). It may be later. In the latter case, the pickup unit 130 holds the chip 15 from above via the mask 72.
- the substrate processing methods include preparation of the first substrate 10 (S301), formation of the protective film 20 (S302), formation of the primary groove (S303), and side etching of the primary groove (S304).
- the secondary groove 75 is formed (S305), the protective film 20 and the second substrate 30 are adhered (S306), the first substrate 10 is thinned (S307), and cleaning and etching (S308) are performed.
- the preparation of the first substrate 10 (S301), the formation of the protective film 20 (S302), and the formation of the primary groove (S303) are carried out in the same manner as in S201, S202, and S203 shown in FIG. .. Further, since the primary groove obtained in S303 is the same as the first groove 71 shown in FIG. 7C, the illustration is omitted.
- the side surface of the primary groove is etched.
- the etching may be either wet etching or dry etching, but may be dry etching capable of uniformly etching the side surface of the primary groove in the depth direction, and may be, for example, plasma etching. Removes distortions, scratches and particles that occur during the formation of primary grooves.
- the bottom surface of the primary groove is cut by the blade 301, the primary groove is extended in the depth direction, and the secondary groove 75 is formed.
- the depth of the secondary groove 75 is a depth that reaches the second main surface 12 of the first substrate 10 after thinning (S307) described later.
- the formation of the secondary groove 75 (S305) is carried out after the formation of the primary groove (S303), and the primary groove is formed by ablation processing with a laser beam.
- the ablation process is effective when the device 14 is brittle, for example, when the device 14 contains a porous Low-k material.
- the depth of the primary groove is deeper than the depth of the device 14, and the primary groove reaches the base substrate 13. Since the primary groove is formed in advance, cutting of the device 14 by the blade 301 can be suppressed, and distortion and scratches of the device 14 can be suppressed.
- the protective film 20 and the second substrate 30 are adhered by the adhesive film 40. Since the first substrate 10 and the second substrate 30 are adhered by the adhesive film 40, the second substrate 30 can support the first substrate 10.
- the thinning of the first substrate 10 is performed after the protective film 20 and the second substrate 30 are bonded (S306).
- the thinning of the first substrate 10 includes grinding the second main surface 12 of the first substrate 10, as shown in FIG. 10 (C). The grinding is performed by the grindstone 302. After grinding, further polishing may be performed. Due to the thinning (S307), the secondary groove 75 is exposed on the second main surface 12 of the first substrate 10, and the first substrate 10 is divided into a plurality of chips 15. The plurality of chips 15 are flatly supported by the second substrate 30.
- the secondary groove 75 is cleaned and the side surface 75a of the secondary groove 75 is etched. Since the secondary groove 75 is cleaned, grinding debris generated when the first substrate 10 is thinned and cutting debris generated when the secondary groove 75 is formed can be removed. Further, since the side surface 75a of the secondary groove 75 is etched, distortion and scratches generated during the formation of the secondary groove 75 can be removed.
- Cleaning of the secondary groove 75 is, for example, scrub cleaning, spin cleaning, spray cleaning, or the like.
- the nozzle 303 discharges the cleaning liquid L5 from above with respect to the laminated substrate 50. Not only the upper surface of the laminated substrate 50 but also the lower surface of the laminated substrate 50 may be cleaned at the same time. In scrubbing, the surface of the laminated substrate 50 is scrubbed with a brush or sponge (not shown).
- the cleaning of the secondary groove 75 and the etching of the side surface 75a of the secondary groove 75 may be performed separately or at the same time. In the latter case, wet etching is performed. On the other hand, in the former case, the etching may be either wet etching or dry etching.
- the substrate processing methods include preparation of the first substrate 10 (S401), formation of the protective film 20 (S402), formation of the first groove 71 (S403), and the side surface of the first groove 71.
- Etching (S404), adhesion of the protective film 20 and the second substrate 30 (S405), thinning of the first substrate 10 (S406), formation of the second groove 73 (S407), cleaning and etching (S408). And have.
- Preparation of the first substrate 10 (S401), formation of the protective film 20 (S402), formation of the first groove 71 (S403), and side etching of the first groove 71 (S404) are performed in S301, S302, shown in FIG. Since it is carried out in the same manner as in S303 and S304, the description thereof will be omitted.
- the side surface etching (S404) of the first groove 71 is performed after the formation of the first groove 71 (S403) and before the adhesion between the protective film 20 and the second substrate 30 (S405). Distortions, scratches and particles generated during the formation of the first groove 71 can be removed.
- Adhesion (S405) between the protective film 20 and the second substrate 30 is carried out in the same manner as in S204 shown in FIG. 6, so the description thereof will be omitted.
- the laminated substrate 50 obtained in S405 is the same as the laminated substrate 50 shown in FIG. 7 (D) except that the side surface 71a of the first groove 71 has been etched, and thus the illustration is omitted.
- the laminated substrate 50 obtained in S406 is the same as the laminated substrate 50 shown in FIG. 8 (A) except that the side surface 71a of the first groove 71 has been etched, and thus the illustration is omitted.
- the formation of the second groove 73 is performed after the thinning of the first substrate 10 (S406).
- the second groove 73 is formed by cutting with a blade 401 as shown in FIG. 12, instead of etching, unlike the first example shown in FIGS. 6, 7, and 8.
- the blade 401 grinds the planned division line of the second main surface 12 of the first substrate 10.
- the second groove 73 is connected to the first groove 71, and the first substrate 10 is divided into a plurality of chips 15. Since the first groove 71 is formed in advance, the blade 401 does not cut the device 14, so that distortion and scratches on the device 14 can be suppressed.
- S408 Cleaning and etching (S408) are carried out in the same manner as in S308 shown in FIG.
- the second groove 73 is cleaned and the side surface 73a of the second groove 73 is etched. Since the second groove 73 is cleaned, grinding debris generated when the first substrate 10 is thinned and cutting debris generated when the second groove 73 is formed can be removed. Further, since the side surface 73a of the second groove 73 is etched, distortion and scratches generated during the formation of the second groove 73 can be removed.
- the cleaning of the second groove 73 is carried out in the same manner as the cleaning of the secondary groove 75 (FIG. 10 (D)). Further, the etching of the side surface 73a of the second groove 73 is carried out in the same manner as the etching of the side surface 75a of the secondary groove 75. Since both the second groove 73 and the secondary groove 75 are common in that they are formed by cutting with a blade, the same post-treatment is performed.
- the substrate processing methods include preparation of the first substrate 10 (S501), formation of the protective film 20 (S502), adhesion of the protective film 20 and the second substrate 30 (S503), and first. It has thinning of the substrate 10 (S504), formation of a groove 76 (S505), and cleaning and etching (S506).
- the preparation of the first substrate 10 (S501) and the formation of the protective film 20 (S502) are carried out in the same manner as in S201 and S202 shown in FIG. 6, so the description thereof will be omitted.
- Adhesion (S503) between the protective film 20 and the second substrate 30 is carried out in the same manner as in S204 shown in FIG. 6, except that the first substrate 10 is not grooved.
- the laminated substrate 50 obtained in S503 is shown in FIG. 14 (A).
- the thinning of the first substrate 10 is carried out in the same manner as in S205 shown in FIG. 6, except that the first substrate 10 is not grooved.
- the laminated substrate 50 obtained in S504 is shown in FIG. 14 (B).
- the formation of the groove 76 (S505) is performed after the first substrate 10 is thinned (S504).
- the groove 76 is formed on the planned division line of the second main surface 12 of the first substrate 10, penetrates the first substrate 10 and the protective film 20, and reaches the adhesive film 40.
- the first substrate 10 is divided into a plurality of chips 15, and the protective film 20 is divided for each chip 15.
- the groove 76 may be formed by cutting with a blade, but in the present embodiment, it is formed by ablation with a laser beam L6.
- the ablation process is effective when the device 14 is brittle, for example, when the device 14 contains a porous Low-k material.
- the depth of the groove 76 is deeper than the depth of the first groove 71 shown in FIG. 7 (C), and the intensity of the laser beam L6 is shown in FIG. 7 (C). It is higher than the intensity of the indicated laser beam L4. Therefore, distortion and scratches are likely to occur. Therefore, after the groove 76 is formed (S505), cleaning and etching (S506) are performed.
- S506 are carried out in the same manner as in S308 shown in FIG.
- the groove 76 is cleaned and the side surface 76a of the groove 76 is etched. Since the groove 76 is cleaned, grinding debris generated when the first substrate 10 is thinned and debris generated when the groove 76 is formed can be removed. Further, since the side surface 76a of the groove 76 is etched, the strain and scratches generated when the groove 76 is formed can be removed.
- the groove 76 may be formed by cutting depending on the structure of the device 14. In this case as well, cleaning and etching (S506) may be performed after the formation of the groove 76 (S505). In this case as well, the same effect can be obtained.
- the second main surface 12 of the first substrate 10 is ground to thin the first substrate 10, but the technique of the present disclosure is: Not limited to this.
- a part of the first substrate 10 may be removed from the second main surface 12 side so that the second main surface 12 comes closer to the first main surface 11.
- a laser beam is focused and irradiated on a divided surface that divides the first substrate 10 in the plate thickness direction, a plurality of modified layers are formed on the divided surface at intervals, and then the first substrate starts from the modified layer. 10 may be divided by the divided surface to remove a part of the first substrate 10.
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Abstract
Description
複数のチップに分割された第1基板と、前記チップごとに分割済みであって前記チップを保護する保護膜と、前記第1基板を支持する第2基板と、前記保護膜と前記第2基板とを接着する接着膜とを含む積層基板を準備することと、
前記第2基板を透過する光線で前記接着膜の接着力を低下させることと、
前記接着膜との接着力を低下させた前記保護膜と前記チップとを、ピックアップ部で前記接着膜からピックアップすることと、
を有する。
11 第1主表面
12 第2主表面
14 デバイス
15 チップ
20 保護膜
30 第2基板
40 接着膜
50 積層基板
60 第3基板
61 主表面
64 デバイス
100 基板処理装置
110 第1保持台
120 照射器
130 ピックアップ部
140 貯留部
150 活性化部
160 第2保持台
Claims (14)
- 複数のチップに分割された第1基板と、前記チップごとに分割済みであって前記チップを保護する保護膜と、前記第1基板を支持する第2基板と、前記保護膜と前記第2基板とを接着する接着膜とを含む積層基板を準備することと、
前記第2基板を透過する光線で前記接着膜の接着力を低下させることと、
前記接着膜との接着力を低下させた前記保護膜と前記チップとを、ピックアップ部で前記接着膜からピックアップすることと、
を有する、基板処理方法。 - 前記ピックアップ部によって前記チップを保持した状態で、前記保護膜を溶解する液体に前記保護膜を浸漬し、前記保護膜を除去することを有する、請求項1に記載の基板処理方法。
- 前記ピックアップ部によって前記チップを保持した状態で、前記チップの前記保護膜を除去した表面を活性化することと、
前記ピックアップ部によって前記チップを保持した状態で、前記チップの活性化した表面を、第3基板のデバイスが形成された主表面と向い合せ、接合することと、
を有する、請求項2に記載の基板処理方法。 - 前記第1基板の第1主表面に前記保護膜を形成することと、
前記保護膜の形成後に、前記保護膜と前記第2基板とを前記接着膜で接着することと、
前記保護膜と前記第2基板との接着後に、前記第1基板の前記第1主表面とは反対向きの第2主表面を前記第1主表面に近付けるように前記第1基板の一部を除去し、前記第1基板を薄化することと、
を有する、請求項1~3のいずれか1項に記載の基板処理方法。 - 前記保護膜の形成後、前記保護膜と前記第2基板との接着前に、前記保護膜の表面の分割予定線に前記チップのデバイスよりも深い第1溝を形成することと、
前記第1基板の薄化後、前記チップのピックアップ前に、前記第1基板の前記第2主表面の分割予定線に開口部を有するマスクを形成し、前記マスクの前記開口部にて前記第2主表面をエッチングし、前記第1溝につながる第2溝を形成し、前記第1基板を複数の前記チップに分割することと、
を有する、請求項4に基板処理方法。 - 前記保護膜の形成後、前記保護膜と前記第2基板との接着前に、前記保護膜の表面の分割予定線に、薄化後の前記第1基板の前記第2主表面に達する深さの溝を形成することと、
前記保護膜と前記第2基板との接着後に、前記第1基板の薄化によって前記第1基板の前記第2主表面に前記溝を露出させ、前記第1基板を複数の前記チップに分割することと、
前記第1基板の薄化後、前記チップのピックアップ前に、前記溝を洗浄し、且つ前記溝の側面をエッチングすることと、
を有する、請求項4に記載の基板処理方法。 - 前記保護膜の表面の分割予定線に前記溝を形成することは、前記チップのデバイスよりも深い一次溝をレーザー光線で形成し、前記一次溝の側面をエッチングし、次いで、前記一次溝の底面をブレードで切削し、薄化後の前記第1基板の前記第2主表面に達する深さの二次溝を形成することを含む、請求項6に記載の基板処理方法。
- 前記保護膜の形成後、前記保護膜と前記第2基板との接着前に、前記保護膜の表面の分割予定線に前記チップのデバイスよりも深い第1溝を形成することと、
前記第1基板の薄化後、前記チップのピックアップの前に、前記第1基板の前記第2主表面の分割予定線をブレードで切削し、前記第1溝につながる第2溝を形成し、前記第1基板を複数の前記チップに分割することと、
前記第1基板の薄化後、前記チップのピックアップ前に、前記第1溝及び前記第2溝を洗浄し、且つ前記第1溝及び前記第2溝の側面をエッチングすることと、
を有する、請求項4に記載の基板処理方法。 - 前記第1溝の形成後、前記保護膜と前記第2基板との接着前に、前記第1溝の側面をエッチングすることを有する、請求項8に記載の基板処理方法。
- 前記第1基板の薄化後、前記チップのピックアップ前に、前記第1基板の前記第2主表面の分割予定線に、前記接着膜に達する深さの溝を形成し、前記第1基板を複数の前記チップに分割し、且つ前記チップごとに前記保護膜を分割することと、
前記溝の形成後、前記チップのピックアップ前に、前記溝を洗浄し、且つ前記溝の側面をエッチングすることと、
を有する、請求項4に記載の基板処理方法。 - 前記第1基板の前記第2主表面から前記接着膜に達する深さの前記溝は、レーザー光線で形成する、請求項10に記載の基板処理方法。
- 複数のチップに分割された第1基板と、前記チップごとに分割済みであって前記チップを保護する保護膜と、前記第1基板を支持する第2基板と、前記保護膜と前記第2基板とを接着する接着膜とを含む積層基板を保持する第1保持台と、
前記第2基板を透過し前記接着膜の接着力を低下させる光線を前記第2基板に照射する照射器と、
前記接着膜との接着力を低下させた前記保護膜と前記チップとをピックアップするピックアップ部と、
を有する、基板処理装置。 - 前記保護膜を溶解する液体を貯留する貯留部と、
前記ピックアップ部で保持された前記チップを前記第1保持台から前記貯留部に移動させるべく、前記ピックアップ部を移動させる移動部とを有する、請求項12に記載の基板処理装置。 - 前記チップの前記保護膜を除去した表面を活性化する活性化部と、
前記チップの活性化した表面と接合される第3基板を保持する第2保持台とを有し、
前記移動部は、前記ピックアップ部で保持された前記チップを前記第1保持台から前記貯留部及び前記活性化部を経て前記第2保持台に移動させるべく、前記ピックアップ部を移動させる、請求項13に記載の基板処理装置。
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