WO2008041539A1 - Laser processing method - Google Patents
Laser processing method Download PDFInfo
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- WO2008041539A1 WO2008041539A1 PCT/JP2007/068515 JP2007068515W WO2008041539A1 WO 2008041539 A1 WO2008041539 A1 WO 2008041539A1 JP 2007068515 W JP2007068515 W JP 2007068515W WO 2008041539 A1 WO2008041539 A1 WO 2008041539A1
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- value
- laser light
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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
-
- 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
- B23K26/36—Removing material
- B23K26/38—Removing material by boring or cutting
-
- 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
-
- 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
- B23K26/046—Automatically focusing the laser beam
-
- 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
- B23K26/046—Automatically focusing the laser beam
- B23K26/048—Automatically focusing the laser beam by controlling the distance between laser head and workpiece
-
- 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
- B23K26/36—Removing material
- B23K26/40—Removing material taking account of the properties of the material involved
-
- 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
- B23K26/36—Removing material
- B23K26/40—Removing material taking account of the properties of the material involved
- B23K26/402—Removing material taking account of the properties of the material involved involving non-metallic material, e.g. isolators
-
- 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
- B23K26/50—Working by transmitting the laser beam through or within the workpiece
- B23K26/53—Working by transmitting the laser beam through or within the workpiece for modifying or reforming the material inside the workpiece, e.g. for producing break initiation cracks
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- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
- C03B33/00—Severing cooled glass
- C03B33/02—Cutting or splitting sheet glass or ribbons; Apparatus or machines therefor
- C03B33/0222—Scoring using a focussed radiation beam, e.g. laser
-
- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
- C03B33/00—Severing cooled glass
- C03B33/09—Severing cooled glass by thermal shock
- C03B33/091—Severing cooled glass by thermal shock using at least one focussed radiation beam, e.g. laser beam
-
- 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 at least one potential-jump barrier or surface barrier, e.g. PN junction, depletion layer or carrier concentration layer
- H01L21/18—Manufacture or treatment of semiconductor devices or of parts thereof the devices having at least one potential-jump barrier or surface barrier, e.g. PN junction, depletion layer or carrier concentration layer the devices having semiconductor bodies comprising elements of Group IV of the Periodic System 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
-
- 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
- B23K2101/00—Articles made by soldering, welding or cutting
- B23K2101/36—Electric or electronic devices
- B23K2101/40—Semiconductor 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
- B23K2103/00—Materials to be soldered, welded or cut
- B23K2103/50—Inorganic material, e.g. metals, not provided for in B23K2103/02 – B23K2103/26
-
- 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
- H01L21/02367—Substrates
- H01L21/0237—Materials
- H01L21/02373—Group 14 semiconducting materials
- H01L21/02381—Silicon, silicon germanium, germanium
-
- 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
- H01L21/02656—Special treatments
- H01L21/02664—Aftertreatments
- H01L21/02667—Crystallisation or recrystallisation of non-monocrystalline semiconductor materials, e.g. regrowth
- H01L21/02675—Crystallisation or recrystallisation of non-monocrystalline semiconductor materials, e.g. regrowth using laser beams
Definitions
- the present invention relates to a laser heating method for cutting a plate-like workpiece along a planned cutting line.
- Patent Document 1 Japanese Patent Application Laid-Open No. 2004-343008
- the modified region may not be accurately formed at a desired position with respect to the laser light irradiation surface.
- an object of the present invention is to provide a laser processing method capable of accurately forming a modified region at a desired position with respect to a laser light irradiation surface of a workpiece.
- the laser processing method cuts a processing target by irradiating a processing laser beam with a focusing point inside the plate-shaped processing target.
- a modified region that is the starting point of cutting is formed inside the workpiece along the planned cutting line.
- the measurement laser light is irradiated along the planned cutting line, and the measurement laser light reflected by the laser light irradiation surface of the workpiece is reflected.
- Force to detect a detected value When the detected value has a value exceeding a predetermined threshold, a predetermined line section including a line section in which the detected value exceeds a predetermined threshold is determined, and in the predetermined line section Correct the signal value.
- a predetermined line section including a line section in which the detected value exceeds a predetermined threshold is determined, and in the predetermined line section Correct the signal value.
- the line section refers to a section where the detected value exceeds a predetermined threshold in the planned cutting line section along the cutting target line of the workpiece.
- the step of acquiring the signal value when the detected value has a value exceeding a predetermined threshold, it is preferable to acquire the signal value other than the predetermined line section along the scheduled cutting line again. Good.
- the signal value may not be obtained accurately in the vicinity of a predetermined line section where the detected value is affected by the presence of particles. Therefore, by acquiring signal values other than the predetermined line section again, the converging point of the processing laser light can be made to accurately follow the laser light irradiation surface even in the vicinity of the predetermined line section.
- the signal value in the predetermined line section is changed to the signal value in the vicinity of the predetermined line section.
- the signal value may be corrected in a predetermined line section by performing smoothing. In these cases, the condensing point of the processing laser beam can smoothly follow the laser beam irradiation surface.
- the workpiece includes a semiconductor substrate, and the modified region includes a melt processing region.
- the method further includes a step of cutting the object to be processed along a scheduled cutting line using the modified region as a starting point of cutting. As a result, the workpiece can be accurately cut along the planned cutting line.
- FIG. 1 is a plan view of an object to be processed during laser processing by the laser processing apparatus according to the present embodiment.
- FIG. 2 is a cross-sectional view taken along line II-II of the workpiece shown in FIG.
- FIG. 3 is a plan view of an object to be processed after laser processing by the laser processing apparatus according to the present embodiment.
- FIG. 4 is a cross-sectional view taken along line IV-IV of the workpiece shown in FIG.
- FIG. 5 is a cross-sectional view taken along line V—V of the workpiece shown in FIG.
- FIG. 6 is a plan view of a processing object cut by the laser processing apparatus according to the present embodiment. 7] Electric field strength and crack spot size in the laser processing apparatus according to this embodiment
- FIG. 8 is a cross-sectional view of an object to be processed in a first step of the laser processing apparatus according to the present embodiment.
- FIG. 9 is a cross-sectional view of an object to be processed in a second step of the laser processing apparatus according to the present embodiment.
- FIG. 10 is a cross-sectional view of an object to be processed in a third step of the laser processing apparatus according to the present embodiment.
- FIG. 11 is a cross-sectional view of an object to be processed in a fourth step of the laser processing apparatus according to the present embodiment.
- FIG. 12 is a view showing a photograph of a cross section of a part of a silicon wafer cut by the laser processing apparatus according to the present embodiment.
- FIG. 13 is a graph showing the relationship between the wavelength of laser light and the transmittance inside the silicon substrate in the laser processing apparatus according to the present embodiment.
- FIG. 14 is a front view showing a workpiece.
- FIG. 15 is a partial sectional view taken along line XV—XV in FIG.
- FIG. 16 is a diagram for explaining an average difference in the laser processing method according to one embodiment of the present invention.
- FIG. 17 is a view for explaining particle sections in the laser processing method according to one embodiment of the present invention.
- FIG. 18 is a diagram for explaining a control signal in a particle section in the laser processing method according to one embodiment of the present invention.
- FIG. 19 is a diagram for explaining a control signal in a particle section in a conventional laser processing method.
- the energy of the photon is smaller than the absorption band gap E of the material, it is optically transparent.
- the intensity of the laser beam is determined by the peak power density (W / cm 2 ) at the condensing point of the laser beam. For example, when the peak density is l X 10 8 (W / cm 2 ) or more. Multiphoton absorption occurs.
- the peak power density is obtained by (the energy per pulse of the laser beam at the focal point) ⁇ (the laser beam beam spot cross-sectional area X the nose width).
- the intensity of the laser beam is determined by the electric field intensity (W / cm 2 ) at the condensing point of the laser beam.
- a surface 3 of a wafer-like (plate-like) workpiece 1 has a scheduled cutting line 5 for cutting the workpiece 1.
- the planned cutting line 5 is a virtual line extending straight.
- the modified region 7 is irradiated with the laser beam L with the focusing point P aligned inside the workpiece 1 under the condition that multiphoton absorption occurs.
- the condensing point P is a part where the laser beam is condensed.
- the planned cutting line 5 is not limited to a straight line but may be a curved line! /, And not only a virtual line but also a line actually drawn on the workpiece 1! /.
- the laser beam L is moved along the planned cutting line 5 (ie, in the direction of arrow A in FIG. 1) to move the condensing point P along the planned cutting line 5. .
- the modified region 7 is formed inside the workpiece 1 along the planned cutting line 5, and the modified region 7 becomes the cutting start region 8.
- the cutting starting point region 8 means a region that becomes a starting point of cutting (cracking) when the workpiece 1 is cut.
- This cutting start region 8 may be formed by continuously forming the modified region 7.
- the modified region 7 may be formed intermittently.
- the surface 3 of the workpiece 1 is hardly absorbed by the surface 3 of the workpiece 1, so that the surface 3 of the workpiece 1 is not melted.
- the modified region includes the following (1) to (1) to
- the modified region is a crack region including one or more cracks
- the laser beam is irradiated under the condition that the electric field intensity at the focal point is 1 ⁇ 10 8 (W / cm 2 ) or more and the nose width is 1 ⁇ s or less.
- the size of the Knoll width is a condition in which a crack region can be formed only inside the workpiece without causing extra damage to the surface of the workpiece while causing multiphoton absorption.
- a phenomenon called optical damage due to multiphoton absorption occurs inside the workpiece. This optical damage induces thermal strain inside the workpiece, thereby forming a crack region inside the workpiece.
- the upper limit value of the electric field strength is, for example, 1 ⁇ 10 12 (W / cm 2 ).
- the pulse width is preferably lns to 200 ns.
- the present inventor obtained the relationship between the electric field strength and the size of the crack by experiment.
- the experimental conditions are as follows.
- Polarization characteristics linearly polarized light
- the laser beam quality is TEM, which is highly condensable and can be focused to the wavelength of the laser beam.
- FIG. 7 is a graph showing the results of the experiment.
- the horizontal axis is the peak power density, which is the laser power S pulse laser light, so the electric field strength is expressed by the peak power density.
- the vertical axis shows the size of the crack (crack spot) formed inside the workpiece by 1 pulse of laser light. Crack spot force S gathers to form a crack region.
- the size of the crack spot is the size of the maximum length of the crack spot shape.
- the data indicated by the black circles in the graph are for the condenser lens (C) with a magnification of 100 and a numerical aperture (NA) of 0 ⁇ 80.
- the data indicated by white circles in the graph is for the case where the magnification of the condenser lens (C) is 50 times and the numerical aperture (NA) is 0 ⁇ 55.
- the peak power density is about 10 U (W / cm 2 )
- a crack spot is generated inside the workpiece, and the crack spot increases as the peak power density increases.
- FIG. 8 Under the condition that multiphoton absorption occurs, the condensing point P is aligned inside the workpiece 1 and the laser beam L is irradiated to form a crack region 9 along the planned cutting line.
- the crack region 9 is a region including one or more cracks.
- the crack region 9 thus formed becomes a cutting start region.
- the crack grows further starting from the crack region 9 (that is, starting from the cutting start region), and as shown in FIG.
- FIG. 11 when the workpiece 1 is cracked, the workpiece 1 is cut.
- a crack that reaches the front surface 3 and the back surface 21 of the workpiece 1 may grow naturally, or may grow when a force is applied to the workpiece 1.
- the focusing point is set inside the object to be processed (for example, a semiconductor material such as silicon), and the electric field strength at the focusing point is 1 X 10 8 (W / cm 2 ) or more and the pulse width is 1 ⁇ s or less. Irradiate laser light under certain conditions. As a result, the inside of the workpiece is locally heated by multiphoton absorption. By this heating, a melt processing region is formed inside the workpiece.
- the melt treatment region is a region once solidified after melting, a region in a molten state, or a region re-solidified from a molten state, and can also be referred to as a phase-changed region or a region where the crystal structure has changed.
- the melt processing region is a single crystal structure, an amorphous structure, or a polycrystalline structure. It can also be said that a certain structure is changed to another structure. In other words, for example, a region that has changed from a single crystal structure to an amorphous structure, a region that has changed from a single crystal structure to a polycrystalline structure, and a region that has changed from a single crystal structure to a structure that includes an amorphous structure and a polycrystalline structure. means.
- the melt processing region has, for example, an amorphous silicon structure.
- the upper limit value of the electric field strength is, for example, 1 ⁇ 10 12 (W / cm 2 ).
- the pulse width is preferably lns to 200 ns.
- the present inventor has confirmed through experiments that a melt-processed region is formed inside a silicon wafer (semiconductor substrate).
- the experimental conditions are as follows.
- Polarization characteristics linearly polarized light
- FIG. 12 is a view showing a photograph of a cross section of a part of a silicon wafer cut by laser processing under the above conditions.
- a melt processing region 13 is formed inside the silicon wafer 11.
- the size in the thickness direction of the melt processing region 13 formed under the above conditions is about 100 m.
- FIG. 13 is a graph showing the relationship between the wavelength of the laser beam and the transmittance inside the silicon substrate. However, the reflection component on the front side and the back side of the silicon substrate is removed to show the transmittance only inside. The above relationship was shown for each of the silicon substrate thickness t forces of 50 mm, 100 mm, 200 ⁇ m, 500 ⁇ m, and 1000 ⁇ m.
- the thickness of a silicon substrate is 500 m or less at 1064 nm, which is the wavelength of an Nd: YAG laser
- 1064 nm which is the wavelength of an Nd: YAG laser
- the melt processing region 13 by multiphoton absorption is formed near the center of the silicon wafer 11, that is, at a portion of 175 111 from the surface.
- the transmittance is 90% or more with reference to a silicon wafer having a thickness of 200 m. Therefore, the laser beam is hardly absorbed inside the silicon wafer 11, and almost all is transmitted.
- melt processing region 13 is formed by multiphoton absorption.
- the formation of the melt processing region by multiphoton absorption is, for example, “Evaluation of silicon processing characteristics by picosecond pulse laser” on pages 72 to 73 of the 66th Annual Meeting Summary (April 2000). It is described in.
- the silicon wafer has a direction force in the cross-sectional direction starting from the cutting start region formed by the melt processing region, thus causing a crack, and the crack reaches the front surface and the back surface of the silicon wafer. As a result, it is cut.
- the cracks that reach the front and back surfaces of the silicon wafer may grow spontaneously, or they may grow when force is applied to the silicon wafer.
- the crack grows from a state where the melt processing region forming the cutting start region is melted, and the cutting start region In some cases, cracks grow when the solidified region is melted from the molten state.
- the melt processing region is formed only inside the silicon wafer, and the melt processing region is formed only inside the cut surface after cutting as shown in FIG.
- the formation of the melt-processed region may be caused not only by multiphoton absorption but also by other absorption effects.
- the focusing point inside the workpiece eg glass
- the pulse width is Ins or less.
- the norm width is made extremely short and multiphoton absorption occurs inside the workpiece, the energy due to multiphoton absorption is not converted into thermal energy, and the ionic valence change, crystal Permanent structural changes such as conversion or polarization orientation are induced to form a refractive index changing region.
- the upper limit value of the electric field strength is, for example, l X 10 12 (W / cm 2 ).
- the Norse width is preferably less than Ins, more preferably less than lps.
- the cutting origin region is formed as follows in consideration of the crystal structure of the wafer-like workpiece and its cleavage property. Then, it becomes possible to cut the workpiece with high accuracy and with a smaller force, starting from the cutting start region.
- a cutting origin region in a direction along the (111) plane (first cleavage plane) or the (110) plane (second cleavage plane) Is preferably formed.
- a substrate made of a zinc-blende-type III-V compound semiconductor such as GaAs it is preferable to form the cutting origin region in the direction along the (110) plane.
- the field of a substrate having a hexagonal crystal structure such as sapphire (Al 2 O 3).
- the cutting origin region in the direction along the (1120) plane (eight plane) or! / (1100) plane (M plane) with the (0001) plane (C plane) as the main plane. .
- the workpiece 1 includes a silicon wafer 11 and a functional element layer 16 including a plurality of functional elements 15 and formed on the surface 11a of the silicon wafer 11.
- 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. Many are formed in a matrix in a direction parallel to 6 and in a direction perpendicular to it. Such a workpiece 1 is cut along a planned cutting line 5 set in a lattice shape so as to pass between adjacent functional elements.
- the thickness direction of the workpiece 1 is described as the Z-axis direction.
- the surface 3 of the workpiece 1 is imaged through, for example, a condensing lens with a CCD camera, and the mounting table is set so that the contrast of the projected reticle pattern is maximized. Move relative to Z axis. The position in the Z direction of the surface 3 at this time is the focus position (the displacement of the surface 3 is 0 H m).
- the laser beam for measurement is irradiated toward the workpiece 1 through the condensing lens, and the reflected light reflected by the surface 3 is received by, for example, a four-division photodiode.
- This reflected light is an example
- astigmatism is added by a shaping optical system composed of a cylindrical lens and a plano-convex lens, and the light is condensed on the light receiving surface of the quadrant photodiode to form a condensed image on the light receiving surface. Therefore, the shape of the condensed image changes according to the displacement of the surface 3 of the workpiece 1 (the position of the condensing point of the measurement laser beam with respect to the surface 3). Therefore, when the reflected light is received by the four-division photodiode, the displacement of the surface 3 is detected as an astigmatism signal, and a total light amount signal corresponding to the total light amount value of the reflected light is detected.
- a controller obtains a displacement sensor signal from the astigmatism signal and the total light amount signal, and stores this displacement sensor signal as a feedback reference value (predetermined value) VO. That is, the displacement sensor signal at the focus position is stored as the feedback target signal VO.
- the displacement sensor signal is obtained by dividing the astigmatism signal by the total light quantity signal, and is a relative value of the astigmatism signal with respect to the total received light quantity. Thereby, even when the amount of light changes, the displacement of the surface 3 is stably detected.
- a measurement laser beam is irradiated while relatively moving the mounting table at a speed of 300 mm / s, a displacement sensor signal is calculated, and the displacement sensor signal is calculated.
- VO the feedback reference value
- the position of the collecting lens in the Z-axis direction is adjusted by a piezo element.
- a control signal (signal value) of the control is recorded in, for example, a controller (trace recording).
- the position control is feedback control with a sampling period of 0.05 ms.
- a section along the planned cutting line 5 of the workpiece 1 is referred to as a planned cutting line section.
- the displacement sensor signal ⁇ is monitored, and, for example, the moving average 0, which is an average value for 8 samplings, is calculated. And the displacement sensor signal In order to clarify the part where the signal waveform is disturbed due to the presence of particles in the signal ⁇ , and to suppress minute signal changes (noise) in other parts other than the part, the displacement sensor signal ⁇ And the average difference ⁇ which is the difference between the moving average 13 and the moving average 13.
- the predetermined line including the line section S in which the average difference ⁇ exceeds the predetermined threshold in the scheduled cutting line section.
- the section is the particle section ⁇ .
- the scheduled cutting section is the particle section ⁇ .
- the measurement table is irradiated with laser light for measurement while moving the mounting table again along the scheduled cutting line 5, and the displacement sensor signal is calculated.
- the displacement sensor signal is the feedback reference value V0.
- the position of the focusing lens in the Z-axis direction is controlled by the piezo element, and the control signal of the control is re-recorded.
- the piezo element is fixed. In other words, at the time of retrace recording, the Z-axis direction position of the condensing lens in the particle section Z is fixed.
- control signal in the particle section Z is smoothing the control signal in the vicinity of the particle section Z (broken line in Fig. 18 (c)), the control signal is complemented in the particle section Z, and the particle section Z Repeat trace recording other than.
- the cutting lines in the front and rear lines continue smoothly.
- the control signal in the particle section z is supplemented with a curve.
- irradiate the measurement laser beam while moving the mounting table relative to the planned cutting line 5 again calculate the displacement sensor signal, and keep the displacement sensor signal at the feedback reference value V0.
- the position of the condenser lens in the Z-axis direction is controlled by the piezo element, and the control signal for the control is re-recorded.
- the piezo element is driven by a control signal with a curve complement.
- the Z-axis direction position of the condensing lens in the particle section Z is set to the position by the control signal with curve interpolation.
- the recorded control signal is reproduced by a piezo element to operate the condensing lens in the Z-axis direction, and the processing laser beam is processed by aligning the condensing point inside the silicon wafer 11. Irradiate object 1. At this time, in the particle section Z, the processing laser light is turned off. In other words, when the laser beam for processing is irradiated, the laser beam for processing in the particle section Z is not irradiated. As a result, a modified region serving as a starting point for cutting is formed inside the silicon wafer 11.
- the difference between the displacement sensor signal ⁇ and the moving average (the difference between and the average difference ⁇ is set as the average difference ⁇ , and the average difference ⁇ is provided with a threshold value and exists in the scheduled cutting line section.
- the force to detect the particle The difference between the displacement sensor signal ⁇ and the feedback reference value VO may be used as an average difference, and a threshold value may be set for the average difference.
- a threshold value is provided to detect particles existing in the line segment to be cut, which corresponds to providing a predetermined threshold value for the detected value.
- the particle section ⁇ including the line section S in which the absolute value of the average difference ⁇ exceeds 0.2 V is determined, and the control signal is transmitted in the particle section. to correct.
- the section where the partisle exists in the planned cutting line section is detected as the line section S, and there is a particle on the planned cutting line 5, and it can be determined that the measurement laser beam is irregularly reflected by this particle. it can.
- the focusing point of the processing laser beam can be made to accurately follow the surface 3 of the workpiece 1. Therefore, the focal point can be adjusted to a desired position with respect to the surface 3, and the modified region can be accurately formed at the desired position with respect to the surface 3.
- the particles are irradiated with the processing laser light to prevent the particles from being pulverized and scattered around, and as a result, the entire processing target 1 is damaged by force and pulverization. It is prevented.
- control signal is made constant in the particle section ⁇ , or the control signal is smoothed by the control signal in the vicinity of the particle section ⁇ . Is corrected. As a result, the tracking of the condensing point of the processing laser beam to the surface 3 becomes smooth.
- the retrace recording is performed.
- the retrace may not be performed.
- the moving average 0 is an average value for eight samplings of the displacement sensor signal ⁇ , and an average straightness for ten samplings. Well, you can set as appropriate.
- control signal of the particle section may be complemented only with the control signal in the line section scheduled to be cut at either the forward or rear side of the particle section Z. Further, there is a case where straight line interpolation is performed instead of curve interpolation.
- the irradiation condition of the additional laser beam is not limited by the pulse pitch width, the output, or the like, and can be various irradiation conditions.
- the modified region can be accurately formed at a desired position from the laser light irradiation surface of the workpiece.
Description
Claims
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CN2007800372144A CN101522363B (zh) | 2006-10-03 | 2007-09-25 | 激光加工方法 |
EP07828332.2A EP2070635B1 (en) | 2006-10-03 | 2007-09-25 | Laser processing method |
KR1020097003671A KR101449771B1 (ko) | 2006-10-03 | 2007-09-25 | 레이저 가공방법 |
US12/443,755 US8933368B2 (en) | 2006-10-03 | 2007-09-25 | Laser processing method for cutting planar object |
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JP2006271986A JP5132911B2 (ja) | 2006-10-03 | 2006-10-03 | レーザ加工方法 |
JP2006-271986 | 2006-10-03 |
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US (1) | US8933368B2 (ja) |
EP (1) | EP2070635B1 (ja) |
JP (1) | JP5132911B2 (ja) |
KR (1) | KR101449771B1 (ja) |
CN (1) | CN101522363B (ja) |
TW (1) | TWI454329B (ja) |
WO (1) | WO2008041539A1 (ja) |
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Publication number | Publication date |
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CN101522363B (zh) | 2013-01-02 |
US8933368B2 (en) | 2015-01-13 |
EP2070635A1 (en) | 2009-06-17 |
US20100012633A1 (en) | 2010-01-21 |
CN101522363A (zh) | 2009-09-02 |
JP2008087054A (ja) | 2008-04-17 |
TWI454329B (zh) | 2014-10-01 |
JP5132911B2 (ja) | 2013-01-30 |
KR101449771B1 (ko) | 2014-10-14 |
TW200902205A (en) | 2009-01-16 |
EP2070635B1 (en) | 2015-02-18 |
KR20090073088A (ko) | 2009-07-02 |
EP2070635A4 (en) | 2014-02-12 |
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