WO2012014716A1 - チップの製造方法 - Google Patents
チップの製造方法 Download PDFInfo
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- WO2012014716A1 WO2012014716A1 PCT/JP2011/066344 JP2011066344W WO2012014716A1 WO 2012014716 A1 WO2012014716 A1 WO 2012014716A1 JP 2011066344 W JP2011066344 W JP 2011066344W WO 2012014716 A1 WO2012014716 A1 WO 2012014716A1
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- Prior art keywords
- modified region
- workpiece
- modified
- substrate
- functional element
- Prior art date
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- 238000004519 manufacturing process Methods 0.000 title claims abstract description 32
- 238000005530 etching Methods 0.000 claims abstract description 54
- 239000000758 substrate Substances 0.000 claims abstract description 40
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- 229910052581 Si3N4 Inorganic materials 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 2
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- HQVNEWCFYHHQES-UHFFFAOYSA-N silicon nitride Chemical compound N12[Si]34N5[Si]62N3[Si]51N64 HQVNEWCFYHHQES-UHFFFAOYSA-N 0.000 description 2
- 238000009751 slip forming Methods 0.000 description 2
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- 239000007864 aqueous solution Substances 0.000 description 1
- ONRPGGOGHKMHDT-UHFFFAOYSA-N benzene-1,2-diol;ethane-1,2-diamine Chemical compound NCCN.OC1=CC=CC=C1O ONRPGGOGHKMHDT-UHFFFAOYSA-N 0.000 description 1
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Images
Classifications
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L21/00—Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
- H01L21/02—Manufacture or treatment of semiconductor devices or of parts thereof
- H01L21/04—Manufacture or treatment of semiconductor devices or of parts thereof the devices having potential barriers, e.g. a PN junction, depletion layer or carrier concentration layer
- H01L21/18—Manufacture or treatment of semiconductor devices or of parts thereof the devices having potential barriers, e.g. a PN junction, depletion layer or carrier concentration layer the devices having semiconductor bodies comprising elements of Group IV of the Periodic Table or AIIIBV compounds with or without impurities, e.g. doping materials
- H01L21/30—Treatment of semiconductor bodies using processes or apparatus not provided for in groups H01L21/20 - H01L21/26
- H01L21/302—Treatment of semiconductor bodies using processes or apparatus not provided for in groups H01L21/20 - H01L21/26 to change their surface-physical characteristics or shape, e.g. etching, polishing, cutting
- H01L21/304—Mechanical treatment, e.g. grinding, polishing, cutting
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L21/00—Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
- H01L21/70—Manufacture or treatment of devices consisting of a plurality of solid state components formed in or on a common substrate or of parts thereof; Manufacture of integrated circuit devices or of parts thereof
- H01L21/77—Manufacture or treatment of devices consisting of a plurality of solid state components or integrated circuits formed in, or on, a common substrate
- H01L21/78—Manufacture or treatment of devices consisting of a plurality of solid state components or integrated circuits formed in, or on, a common substrate with subsequent division of the substrate into plural individual devices
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K26/00—Working by laser beam, e.g. welding, cutting or boring
- B23K26/02—Positioning or observing the workpiece, e.g. with respect to the point of impact; Aligning, aiming or focusing the laser beam
- B23K26/04—Automatically aligning, aiming or focusing the laser beam, e.g. using the back-scattered light
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L21/00—Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
- H01L21/02—Manufacture or treatment of semiconductor devices or of parts thereof
- H01L21/02104—Forming layers
- H01L21/02365—Forming inorganic semiconducting materials on a substrate
- H01L21/02612—Formation types
- H01L21/02617—Deposition types
- H01L21/02631—Physical deposition at reduced pressure, e.g. MBE, sputtering, evaporation
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L21/00—Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
- H01L21/02—Manufacture or treatment of semiconductor devices or of parts thereof
- H01L21/04—Manufacture or treatment of semiconductor devices or of parts thereof the devices having potential barriers, e.g. a PN junction, depletion layer or carrier concentration layer
- H01L21/18—Manufacture or treatment of semiconductor devices or of parts thereof the devices having potential barriers, e.g. a PN junction, depletion layer or carrier concentration layer the devices having semiconductor bodies comprising elements of Group IV of the Periodic Table or AIIIBV compounds with or without impurities, e.g. doping materials
- H01L21/30—Treatment of semiconductor bodies using processes or apparatus not provided for in groups H01L21/20 - H01L21/26
- H01L21/302—Treatment of semiconductor bodies using processes or apparatus not provided for in groups H01L21/20 - H01L21/26 to change their surface-physical characteristics or shape, e.g. etching, polishing, cutting
- H01L21/306—Chemical or electrical treatment, e.g. electrolytic etching
- H01L21/30625—With simultaneous mechanical treatment, e.g. mechanico-chemical polishing
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L21/00—Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
- H01L21/02—Manufacture or treatment of semiconductor devices or of parts thereof
- H01L21/04—Manufacture or treatment of semiconductor devices or of parts thereof the devices having potential barriers, e.g. a PN junction, depletion layer or carrier concentration layer
- H01L21/18—Manufacture or treatment of semiconductor devices or of parts thereof the devices having potential barriers, e.g. a PN junction, depletion layer or carrier concentration layer the devices having semiconductor bodies comprising elements of Group IV of the Periodic Table or AIIIBV compounds with or without impurities, e.g. doping materials
- H01L21/30—Treatment of semiconductor bodies using processes or apparatus not provided for in groups H01L21/20 - H01L21/26
- H01L21/324—Thermal treatment for modifying the properties of semiconductor bodies, e.g. annealing, sintering
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L21/00—Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
- H01L21/02—Manufacture or treatment of semiconductor devices or of parts thereof
- H01L21/04—Manufacture or treatment of semiconductor devices or of parts thereof the devices having potential barriers, e.g. a PN junction, depletion layer or carrier concentration layer
- H01L21/48—Manufacture or treatment of parts, e.g. containers, prior to assembly of the devices, using processes not provided for in a single one of the subgroups H01L21/06 - H01L21/326
- H01L21/4814—Conductive parts
- H01L21/4885—Wire-like parts or pins
- H01L21/4896—Mechanical treatment, e.g. cutting, bending
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L21/00—Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
- H01L21/70—Manufacture or treatment of devices consisting of a plurality of solid state components formed in or on a common substrate or of parts thereof; Manufacture of integrated circuit devices or of parts thereof
- H01L21/77—Manufacture or treatment of devices consisting of a plurality of solid state components or integrated circuits formed in, or on, a common substrate
- H01L21/78—Manufacture or treatment of devices consisting of a plurality of solid state components or integrated circuits formed in, or on, a common substrate with subsequent division of the substrate into plural individual devices
- H01L21/7806—Manufacture or treatment of devices consisting of a plurality of solid state components or integrated circuits formed in, or on, a common substrate with subsequent division of the substrate into plural individual devices involving the separation of the active layers from a substrate
Definitions
- the present invention relates to a manufacturing method for manufacturing a chip in which a functional element is formed on a substrate.
- a plate-like workpiece formed of silicon is polished and thinned to a desired thickness, and a functional element is formed on one main surface of the thinned workpiece.
- a functional element is formed on one main surface of the thinned workpiece.
- the object to be processed is thinned by polishing as described above, and therefore it is extremely difficult to handle the object to be processed. Furthermore, in this case, since the processed object after polishing has flexibility due to its thinness, it is not easy to flatten the processed object when forming a functional element on the processed object. Even in this respect, it is difficult to handle the workpiece. Therefore, it is strongly desired that the above-described prior art can easily manufacture a chip having a desired thickness.
- an object of the present invention is to provide a chip manufacturing method capable of easily manufacturing a chip having a desired thickness.
- a chip manufacturing method is a manufacturing method for manufacturing a chip in which a functional element is formed on a substrate, and is a plate-like formed of silicon.
- the second modified region is formed so that the second modified region extending corresponding to the side edge of the substrate as viewed from one main surface is connected to the first modified region along the thickness direction of the workpiece.
- the first and second modified regions are formed in the workpiece, and the etching is selectively advanced along the first and second modified regions, so that the workpiece is processed. A part is cut off to form a substrate.
- a chip having a desired thickness is formed without thinning the object to be processed by polishing. Therefore, handling of the workpiece is facilitated, and a chip having a desired thickness can be easily manufactured.
- a part on the one main surface side of the workpiece may be cut out as a substrate.
- first and second modified region forming steps are performed after the functional element forming step, and in the first and second modified region forming steps, the other main surface opposite to the one main surface is transferred to the workpiece.
- Laser light may be incident and condensed.
- the first and second modified regions are formed, it is possible to suppress the functional element from being irradiated with laser light, and the influence of the laser light irradiation affects the functional element (in other words, the functional element). It is possible to suppress the influence of the presence of the laser beam on the laser light.
- the functional element forming step may be performed after the first and second modified region forming steps.
- the laser beam can be easily irradiated when the first and second modified regions are formed.
- the functional element forming step may be performed after the first modified region forming step, and the second modified region forming step may be performed after the functional element forming step.
- the second modified region is formed after the functional element is formed, the workpiece is unintentionally cut along the second modified region due to, for example, an external force when the functional element is formed. Can be suppressed.
- the other main surface side opposite to the one main surface in the processing target is cut along the first modified region to thin the processing target, and the thinned processing target is 2 A substrate may be formed by cutting along the modified region.
- FIG. 3 is a cross-sectional view taken along the line III-III of the workpiece in FIG. 2. It is a top view of the processing target after laser processing.
- FIG. 5 is a cross-sectional view taken along the line VV of the workpiece in FIG. 4.
- FIG. 5 is a cross-sectional view taken along line VI-VI of the workpiece in FIG. 4.
- A) is a sectional side view of the workpiece for explaining the first embodiment
- (b) is a sectional side view of the workpiece to be continued from FIG. 7 (a), and (c) is FIG. 7 (b).
- FIG. 12 (a), and (c) is a sectional view of FIG. It is a sectional side view of the processing target object which shows the continuation.
- (A) is a side sectional view of a processing object for explaining a 4th embodiment
- (b) is a side sectional view of a processing object which shows a continuation of Drawing 13 (a).
- (A) is a side sectional view of a processing object for explaining another embodiment
- (b) is a side sectional view of the processing object showing a continuation of FIG. 14 (a)
- (c) is FIG. 14 (b). It is a sectional side view of the processing target object which shows the continuation.
- the modified region is formed by condensing the laser beam inside the workpiece. First, the formation of the modified region will be described below with reference to FIGS.
- a laser processing apparatus 100 includes a laser light source 101 that oscillates a laser beam L, a dichroic mirror 103 that is arranged so as to change the direction of the optical axis (optical path) of the laser beam L, and A condensing lens 105 for condensing the laser light L. Further, the laser processing apparatus 100 includes a support base 107 for supporting the workpiece 1 irradiated with the laser light L condensed by the condensing lens 105, and a stage 111 for moving the support base 107. And a laser light source control unit 102 for controlling the laser light source 101 to adjust the output of the laser light L, the pulse width, and the like, and a stage control unit 115 for controlling the movement of the stage 111.
- the laser beam L emitted from the laser light source 101 has its optical axis changed by 90 ° by the dichroic mirror 103, and is a plate-like processing object placed on the support base 107. 1 is condensed by the condensing lens 105. At the same time, the stage 111 is moved, and the workpiece 1 is moved relative to the laser beam L along the modified region formation scheduled line 5. As a result, a modified region along the modified region formation scheduled line 5 is formed on the workpiece 1.
- a modified region formation scheduled line 5 is set as a modified region formation scheduled portion in the processing object 1.
- the modified region formation scheduled line 5 here is a virtual line extending linearly.
- the laser beam L is applied to the modified region formation planned line 5 in a state where the focused point P is aligned with the inside of the workpiece 1. (Ie, in the direction of arrow A in FIG. 2).
- the modified region 7 is formed inside the workpiece 1 along the modified region formation scheduled line 5, and this modified region 7 is etched (described later).
- the removal region 8 is formed by the step.
- the condensing point P is a location where the laser light L is condensed.
- the modified region formation scheduled line 5 is not limited to a straight line, but may be a curved line, a three-dimensional combination of these, or a coordinate designated.
- the modified region 7 may be formed continuously or intermittently. Further, the modified region 7 may be in the form of a line or a dot. In short, the modified region 7 only needs to be formed at least inside the workpiece 1.
- a crack may be formed starting from the modified region 7, and the crack and modified region 7 may be exposed on the outer surface (front surface, back surface, or side surface) of the workpiece 1.
- the laser beam L passes through the workpiece 1 and is particularly absorbed in the vicinity of the condensing point inside the workpiece 1, whereby a modified region 7 is formed in the workpiece 1.
- a modified region 7 is formed in the workpiece 1.
- surface absorption laser processing when a removed portion such as a hole or a groove is formed by being melted and removed from the front surface 3 (surface absorption laser processing), the processing region gradually proceeds from the front surface 3 side to the back surface side.
- the modified region 7 refers to a region in which the density, refractive index, mechanical strength, and other physical characteristics are different from the surroundings.
- the modified region 7 include a melt processing region, a crack region, a dielectric breakdown region, a refractive index change region, and the like, and there is a region where these are mixed.
- the modified region 7 includes a region where the density of the material of the workpiece 1 is changed compared to the density of the non-modified region, and a region where lattice defects are formed (collectively, a high-density transition region). Also called).
- the melt-processed region, the refractive index changing region, the region where the density of the modified region 7 is changed compared with the density of the non-modified region, and the region where lattice defects are formed are In some cases, cracks (cracks, microcracks) are included in the interface between the non-modified region 7 and the non-modified region.
- the cracks included may be formed over the entire surface of the modified region 7, or may be formed in only a part or a plurality of parts.
- Examples of the processing object 1 include those containing silicon or made of silicon.
- the modified workpiece 7 is etched along the modified region 7 (that is, the modified region 7, Etching is selectively advanced (along a crack included in the modified region 7 or a crack from the modified region 7), and a portion along the modified region 7 in the workpiece 1 is removed.
- This crack is also referred to as a crack, a microcrack, a crack or the like (hereinafter simply referred to as “crack”).
- an etching agent is infiltrated into a crack included in or from the modified region 7 of the workpiece 1 and along the crack surface.
- the etching progresses (progresses).
- the etching progresses and is removed at a selective and fast etching rate (etching rate) along the crack.
- etching rate etching rate
- Etching treatment includes, for example, a case where the workpiece 1 is immersed in an etchant (dipping method: Dipping) and a case where the etchant is applied while rotating the workpiece 1 (spin etching method: SpinEtching). Further, the etching here includes isotropic etching and anisotropic etching.
- etching agent for example, KOH (potassium hydroxide), TMAH (tetramethylammonium hydroxide aqueous solution), EDP (ethylenediamine pyrocatechol), NaOH (sodium hydroxide), CsOH (cesium hydroxide), NH 4 OH (water) Ammonium oxide), hydrazine and the like.
- KOH potassium hydroxide
- TMAH tetramethylammonium hydroxide aqueous solution
- EDP ethylenediamine pyrocatechol
- NaOH sodium hydroxide
- CsOH cesium hydroxide
- NH 4 OH water Ammonium oxide
- hydrazine hydrazine and the like.
- etching agent not only a liquid form but a gel form (jelly form, semi-solid form) can be used.
- the etching agent here is used at a temperature from room temperature to around 100 ° C., and is set to an appropriate temperature according to the required etching rate.
- isotropic etching it can be applied to a relatively thin workpiece (for example, 10 ⁇ m to 100 ⁇ m in thickness), and the etching can proceed in the same direction without depending on the crystal orientation and the modified region. Can do. Also, in this case, if a crack is exposed on the surface, the etching solution is transmitted through the crack and infiltrated inside, and the entire surface in the thickness direction in the modified region is the starting point of the modified region. It is possible to take out the chip etched so that the surface is recessed in a semicircular shape. On the other hand, anisotropic etching can be applied not only to a relatively thin workpiece but also to a thick one (for example, a thickness of 800 ⁇ m to 100 ⁇ m).
- the etching can proceed along the modified region even when the surface on which the modified region is formed is different from the plane orientation. That is, in the anisotropic etching here, in addition to the etching of the plane orientation following the crystal orientation, the etching independent of the crystal orientation is also possible.
- the modified region 7 is formed by condensing the laser beam L inside the workpiece 1, and the surface (one main surface) 3 of the workpiece 1 is formed.
- the etching is selectively advanced along the modified region 7, and a part of the workpiece 1 is cut out as the substrate 11 to form a plurality of chips 10 having a desired thickness. To do.
- the chip 10 is an IC chip used for an IC tag or the like, for example.
- the substrate 11 has a rectangular plate-like outer shape having a predetermined thickness H.
- the length is 5 mm ⁇ 5 mm ⁇ 150 ⁇ m in thickness.
- the functional element 15 is, for example, a semiconductor operation layer formed by crystal growth, a light receiving element such as a photodiode, a light emitting element such as a laser diode, or a circuit element formed as a circuit.
- the protective film 16 is an etching resistant film such as a SiN (silicon nitride) film having resistance to etching.
- the workpiece 1 is a silicon substrate that is transparent to the wavelength of the laser beam L to be irradiated (for example, 1064 nm), and has a thickness of, for example, 300 ⁇ m. Further, the workpiece 1 has a surface 3 to be a (100) surface and a back surface (other main surface) 21 opposite to the surface 3.
- a modified region formation scheduled portion is set in a programmable manner by three-dimensional coordinate designation so as to correspond to the outer shape of the substrate 11.
- the thickness direction of the workpiece 1 (irradiation direction of the laser beam L) is the Z direction, and one direction along the surface 3 of the workpiece 1 is the X direction.
- a direction orthogonal to the X and Z directions will be described as the Y direction.
- the processing object 1 is placed on the mounting table and held with the surface 3 side of the processing object 1 facing upward. Then, a laser beam L is focused on the object to be processed at a position having a predetermined thickness H from the surface 3 (hereinafter, simply referred to as “focus point”), and the laser beam L is moved while moving the focus point in the X direction. Is irradiated from the surface 3 and is irradiated with ON / OFF (scanning). This scan is repeated by changing the position of the condensing point in the Y direction.
- the modified region (first modified region) 7a is continuously formed along the surface 3 at a predetermined depth position corresponding to the predetermined thickness H from the surface 3 of the workpiece 1.
- the modified region 7a extending in a planar shape along the surface 3 in the workpiece 1 is formed with a predetermined thickness H from the surface 3 as corresponding to the back surface 11b (see FIG. 9) of the substrate 11. Form at the position.
- the above scan is repeated by changing the position of the condensing point in the Y direction and the Z direction.
- the surface 3 on the inside of the workpiece 1 extends corresponding to the side edge of the substrate 11 when viewed from the surface 3 and on the surface 3.
- the exposed modified region (second modified region) 7b is continuously formed so as to be connected to the modified region 7a along the Z direction.
- the modified region 7b extending in a lattice shape in the surface 3 view is formed in the Z direction from the surface 3 to the position of the predetermined thickness H as corresponding to the side surface 11c of the substrate 11 (see FIG. 9). Form along.
- the formed modified regions 7a and 7b are formed of modified spots. Further, the modified regions 7a and 7b and the modified spot are formed by enclosing cracks generated from the modified regions 7a and 7b and the modified spot (hereinafter the same).
- a plurality of functional elements 15 are formed on the surface 3 of the workpiece 1, and a plurality of protective films 16 are formed so as to cover these functional elements 15.
- each of the plurality of functional elements 15 is formed in a matrix on the surface 3 so as to be surrounded by the lattice-shaped modified region 7b when viewed from the surface 3.
- the plurality of protective films 16 are covered on the functional element 15 while leaving a gap so that the modified region 7 b is exposed to the surface 3 between the adjacent protective films 16.
- an etching process is performed on the workpiece 1. Specifically, as shown in FIG. 9, for example, 85 ° C. KOH is used as the etching agent 17, and the workpiece 1 is immersed in the etching agent 17 for about 60 minutes (so-called wet etching). As a result, the etchant enters the modified region 7b from the surface 3 side to infiltrate, and the etching is selectively advanced along the modified region 7b toward the inside. Then, an etchant is allowed to enter and infiltrate into the modified region 7a, and etching is selectively advanced along the modified region 7a.
- portions along the modified regions 7a and 7b of the workpiece 1 are removed, and the surface 3 side of the workpiece 1 is cut and separated as a plurality of substrates 11.
- the plurality of chips 10 are manufactured as individual pieces.
- the modified regions 7a and 7b are formed in the workpiece 1, and the etching is selectively advanced along the modified regions 7a and 7b. Only the portion is cut out as the substrate 11 of the chip 10, and as a result, the chip 10 having a desired thickness is formed. Accordingly, in the present embodiment, it is possible to reduce the necessity of thinning the workpiece 1 by polishing or the like, to facilitate the handling of the workpiece 1, and to easily manufacture the chip 10 having a desired thickness. .
- the shape and thickness of the chip 10 can be easily controlled by controlling the formation position of the modified region 7, the chip 10 can be easily made thinner and lighter. Can also be manufactured easily. Moreover, since the chip
- the modified regions 7a and 7b are formed before the functional element 15 is formed. Therefore, the laser beam L can be easily irradiated when the modified regions 7a and 7b are formed. .
- the functional element 15 is formed after the modified regions 7a and 7b are formed, when the modified regions 7a and 7b are formed, the functional element 15 is adversely affected by the irradiation with the laser light L (in other words, the functional element 15). It is possible to suppress adverse effects and restrictions due to the presence of the laser beam 15 on the laser beam L).
- one modified region 7a is formed at a depth position of a predetermined thickness H from the surface 3, and the modified region 7b is formed along the Z direction so as to be connected to the modified region 7a.
- the present invention is not limited to this, and the modified regions 7a and 7b may be formed as follows, for example.
- a plurality of modified regions 7 a are formed at a predetermined depth H in the workpiece 1 and spaced apart from each other.
- the plurality of modified regions 7a are each formed in a rectangular shape corresponding to the back surface 11b of the substrate 11 when viewed from the front surface 3.
- a plurality of modified regions 7b are formed so as to connect to the edge of each modified region 7a and to reach the surface 3 along the thickness direction.
- the plurality of modified regions 7 b are each formed in a rectangular frame shape corresponding to the outer edge of the substrate 11 when viewed from the front surface 3.
- the plurality of chips 10 having a certain thickness are manufactured so as to be simultaneously cut out from the workpiece 1.
- the present invention is not limited to this, and a plurality of chips 10 having different thicknesses are processed. You may manufacture so that it may cut out from the target object 1 simultaneously. For example, by forming the modified region 7a so that the depth position from the surface 3 varies stepwise corresponding to each chip 10, a plurality of chips 10 having different desired thicknesses can be processed into one piece. It is possible to manufacture from the object 1.
- FIG. 11 is a flowchart for explaining the present embodiment.
- a plurality of functional elements 15 are formed on the surface 3 of the workpiece 1, and a plurality of protective films 16 are formed so as to cover these functional elements 15.
- FIG.11 (b) while moving a condensing point, the laser beam L is incident on the process target object 1 from the back surface 21, and is condensed, and the modification area
- the laser light L is incident from the back surface 21 and is condensed, so that the modified regions 7a and 7b are formed after the functional element 15 is formed. Even in the case of forming, it is possible to prevent the functional element 15 from being irradiated with the laser light L, and the adverse effect of the laser light L irradiation on the functional element 15 (in other words, adverse effects due to the presence of the functional element 15 or It is possible to suppress the restriction of the laser beam L).
- FIG. 12 is a flowchart for explaining the present embodiment.
- the laser beam L is condensed on the workpiece 1 while moving the condensing point to form the modified region 7a.
- a plurality of functional elements 15 are formed on the surface 3 of the workpiece 1, and a plurality of protective films 16 are formed so as to cover these functional elements 15.
- the laser beam L is condensed on the workpiece 1 while moving the condensing point, thereby forming the modified region 7b.
- the modified region 7b is formed after the functional element 15 is formed. Therefore, when the functional element 15 is formed, the workpiece 1 is transformed into the modified region 7b by an external force or the like, for example. It is possible to suppress unintentional cutting along the line. Similarly, since the modified region 7b is formed after the modified region 7a is formed, the workpiece 1 is unintentionally cut along the modified region 7b when the modified region 7a is formed. Can be suppressed.
- the gettering effect by the modified region 7a that is, the effect of capturing and fixing the impurities of the workpiece 1 by the modified region 7a.
- FIG. 13 is a flowchart for explaining the present embodiment.
- the laser light L is condensed on the workpiece 1 while moving the condensing point to form the modified regions 7a ′ and 7b ′.
- the modified region (first modified region) 7 a ′ is formed on the surface 3 so as to be exposed from the side surface 23 of the workpiece 1 at a predetermined depth position corresponding to the predetermined thickness H from the surface 3 in the workpiece 1. It is formed continuously along.
- the modified region 7 a ′ extends from the surface 3 in the workpiece 1 to a side surface 23 in a planar shape along the surface 3 at a position of a predetermined thickness H.
- the modified region (second modified region) 7 b ′ extends corresponding to the side edge of the substrate 11 when viewed from the surface 3.
- the modified region 7b ′ here extends in a lattice shape when viewed from the surface 3.
- the modified region 7b ′ is exposed along the front surface 3 and the back surface 21, and is formed along the Z direction so as to be connected to the modified region 7a ′.
- a plurality of functional elements 15 are formed on the surface 3 of the workpiece 1, and a protective film 16 ′ is formed so as to cover the functional elements 15.
- the protective film 16 ′ is an etching resistant film having resistance to etching, and is formed over the entire surface 3 of the workpiece 1. Then, the processing object 1 is placed and held on a tape material 19 such as an expanded tape with the back surface 21 side of the processing object 1 facing upward.
- the processing object 1 is etched.
- the etching agent enters the modified region 7a ′ from the side surface 23 side, and the etching agent enters the modified region 7b ′ from the back surface 21 side, and etching is performed along the modified regions 7a ′ and 7b ′.
- the portion along the modified region 7a ′ of the workpiece 1 is removed, and the back surface 21 side of the workpiece 1 is cut out (cut out) and thinned.
- the thinned workpiece 1 is removed along the modified region 7 b ′, and the workpiece 1 is cut into a plurality of substrates 11. Thereafter, for example, by expanding the tape material 19, the protective film 16 ′ is cut so that the plurality of chips 10 are singulated, and the plurality of chips 10 are manufactured.
- the chip 10 can be manufactured by cutting and thinning the back surface 21 side of the workpiece 1 only by etching.
- the laser light incident surface when forming the modified region 7 is not limited to the front surface 3 of the workpiece 1 but may be the back surface 21 of the workpiece 1.
- any of the modified regions 7a and 7b may be formed first, and the modified regions 7a and 7b are formed in any order.
- the ON / OFF irradiation of the laser beam L in the above embodiment controls the ON / OFF of the emission of the laser beam L, opens and closes a shutter provided on the optical path of the laser beam L,
- the surface 3 of the object 1 may be masked or the like.
- the intensity of the laser beam L may be controlled between an intensity that is equal to or higher than a threshold (processing threshold) at which the modified region is formed and an intensity that is less than the processing threshold.
- the above embodiment can also be applied to processing a desired shape on the substrate.
- the wiring layer 53 is mounted in the recesses 52 a and 52 b of the substrate 51. It is also possible to adapt to the manufacture of the mounting substrate 50.
- the laser beam L is focused on the workpiece 1 while moving the focusing point.
- the modified regions 7 d and 7 e are formed along the surface 3 at positions having a predetermined depth corresponding to the depths of the recesses 52 a and 52 b from the surface 3 of the workpiece 1.
- the modified regions 7f extending on the surface 3 side of the workpiece 1 corresponding to the side edges of the recesses 52a and 52b when viewed from the surface 3 are formed into modified regions 7d and 7e along the Z direction. Form to connect.
- an etching process is performed on the workpiece 1 and etching is selectively advanced along the modified regions 7d to 7f, so that a part of the workpiece 1 is formed.
- the recesses 52a and 52b are formed in the workpiece 1 after cutting, and then the wiring layer 53 is mounted in the recesses 52a and 52b. This makes it possible to easily form the mounting substrate 50 in which the wiring layer 53 is formed in the recesses 52a and 52b having a desired depth and shape.
- DESCRIPTION OF SYMBOLS 1 ... Processing object, 3 ... Surface (one main surface), 7 ... Modified area
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Abstract
Description
次に、第1実施形態に係るチップの製造方法ついて説明する。図7~9は、本実施形態を説明するためのフロー図である。図7~9に示すように、本実施形態では、加工対象物1の内部にレーザ光Lを集光させて改質領域7を形成し、加工対象物1の表面(一主面)3上に機能素子15及び保護膜16を形成した後、改質領域7に沿ってエッチングを選択的に進展させて加工対象物1の一部を基板11として切り抜き、所望厚さのチップ10を複数形成する。
次に、第2実施形態について説明する。なお、本実施形態の説明においては、上記第1実施形態と異なる点について主に説明する。
次に、第3実施形態について説明する。なお、本実施形態の説明においては、上記第1実施形態と異なる点について主に説明する。
次に、第4実施形態について説明する。なお、本実施形態の説明においては、上記第1実施形態と異なる点について主に説明する。
Claims (6)
- 基板上に機能素子が形成されて成るチップを製造するための製造方法であって、
シリコンで形成された板状の加工対象物の一主面に前記機能素子を形成する機能素子形成工程と、
前記加工対象物にレーザ光を集光させることにより、前記加工対象物における前記一主面から前記基板の厚さに対応する所定深さの位置に、第1改質領域を前記一主面に沿って形成する第1改質領域形成工程と、
前記加工対象物にレーザ光を集光させることにより、前記加工対象物における前記一主面側に、前記一主面から見て前記基板の側縁に対応して延在する第2改質領域を、前記加工対象物の厚さ方向に沿って前記第1改質領域に繋がるように形成する第2改質領域形成工程と、
前記第1及び第2改質領域形成工程の後、前記第1及び第2改質領域に沿ってエッチングを選択的に進展させることにより、前記加工対象物の一部を切り取って前記基板を形成するエッチング工程と、を含むチップの製造方法。 - 前記エッチング工程では、前記加工対象物における前記一主面側の一部を前記基板として切り取る請求項1記載のチップの製造方法。
- 前記第1及び第2改質領域形成工程は、前記機能素子形成工程の後に実施され、
前記第1及び第2改質領域形成工程では、前記一主面の反対側の他主面から前記加工対象物にレーザ光を入射して集光させる請求項1又は2記載のチップの製造方法。 - 前記機能素子形成工程は、前記第1及び第2改質領域形成工程の後に実施される請求項1又は2記載のチップの製造方法。
- 前記機能素子形成工程は、前記第1改質領域形成工程の後に実施され、
前記第2改質領域形成工程は、前記機能素子形成工程の後に実施される請求項1又は2記載のチップの製造方法。 - 前記エッチング工程では、前記加工対象物における前記一主面と反対側の他主面側を前記第1改質領域に沿って切り取って前記加工対象物を薄化すると共に、薄化された前記加工対象物を前記第2改質領域に沿って切断し、前記基板を形成する請求項1記載のチップの製造方法。
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EP11812308.2A EP2600390B1 (en) | 2010-07-26 | 2011-07-19 | Chip manufacturing method |
US13/389,053 US8802544B2 (en) | 2010-07-26 | 2011-07-19 | Method for manufacturing chip including a functional device formed on a substrate |
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KR101914146B1 (ko) | 2018-11-02 |
EP2600390B1 (en) | 2019-08-21 |
JP5653110B2 (ja) | 2015-01-14 |
JP2012028646A (ja) | 2012-02-09 |
TW201220378A (en) | 2012-05-16 |
TWI527101B (zh) | 2016-03-21 |
CN103026468A (zh) | 2013-04-03 |
EP2600390A4 (en) | 2016-05-18 |
US20120135585A1 (en) | 2012-05-31 |
US8802544B2 (en) | 2014-08-12 |
KR20130088746A (ko) | 2013-08-08 |
CN103026468B (zh) | 2015-11-25 |
EP2600390A1 (en) | 2013-06-05 |
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