Source: https://patents.google.com/patent/CN103025471B/en
Timestamp: 2020-02-19 13:12:18
Document Index: 151546494

Matched Legal Cases: ['art 102', 'art 115', 'art 24', 'arts 24', 'art 24', 'art 24', 'art 24', 'art 24', 'art 0', 'art 24', 'art 24']

CN103025471B - Laser processing method - Google Patents
CN103025471B
CN103025471B CN201180036018.1A CN201180036018A CN103025471B CN 103025471 B CN103025471 B CN 103025471B CN 201180036018 A CN201180036018 A CN 201180036018A CN 103025471 B CN103025471 B CN 103025471B
CN201180036018.1A
CN103025471A (en
下井英树
久嶋浩之
2010-07-26 Priority to JP2010-167427 priority Critical
2010-07-26 Priority to JP2010167427 priority
2011-07-19 Application filed by 浜松光子学株式会社 filed Critical 浜松光子学株式会社
2011-07-19 Priority to PCT/JP2011/066351 priority patent/WO2012014720A1/en
2013-04-03 Publication of CN103025471A publication Critical patent/CN103025471A/en
2015-05-13 Publication of CN103025471B publication Critical patent/CN103025471B/en
The disclosed laser processing method includes: a modified-region formation step in which laser light (L) is focused on a flat target object (1) formed from silicon, thereby forming a plurality of modified spots (10) inside the target object (1) along a modified-region formation plan line (5b) angled towards one side with respect to the thickness direction of the target object (1), and said modified spots (10) form a modified region (7); and an etching treatment step, after the modified-region formation step, in which the target object (1) is anisotropically etched, said etching made to selectively progress along the modified region (7) to form a void, inside the target object (1), extending at an angle to the thickness direction. In the modified-region formation step, the modified spots (10) are formed such that at least parts of adjacent modified spots (10) overlap when seen from a side direction.
The present invention relates to a kind of laser processing.
As existing laser processing, known has such method: such as patent document 1 is like that described, forming material in silicon single crystal substrate (workpiece) making laser focusing goes bad after portion (upgrading region), implement etch processes to this silicon single crystal substrate to go bad portion remove material, thus at silicon single crystal substrate formation non-through hole or through hole.
Patent document 1: Japanese Unexamined Patent Publication 2005-74663 publication
Here, as laser processing as described above, in the application for every field advances, such as in order to promote design freedom etc., and requirement can be formed in the space in the hole of thickness direction incline direction (following, to be also only called " incline direction ") the upper extension relative to workpiece etc. accurately at workpiece.
Therefore, technical problem of the present invention is, provides a kind of laser processing, and it can be formed at workpiece the space (hole) that the direction that tilts relative to the thickness direction of workpiece extends accurately.
In order to solve the problems of the technologies described above, laser processing involved by an aspect of of the present present invention, it is characterized in that, possess: upgrading region formation process, by by the workpiece of laser focusing in the tabular formed by silicon, roll oblique upgrading region along the thickness direction relative to workpiece towards a side and form preset lines, form multiple upgrading point in the inside of workpiece, form upgrading region by these multiple upgrading points; And this etch processes operation, after the formation process of upgrading region, anisotropic etching process is implemented to workpiece, be in progress with making etching selectivity along upgrading region thus, the space tilting to extend relative to thickness direction is formed at workpiece, in upgrading region formation process, in the mode overlapped each other viewed from direction, a side at least partially of adjacent upgrading point, form multiple upgrading point.
In this laser processing, owing to being carry out anisotropic etching process, therefore utilize etch-rate to depend on this feature of crystal orientation of workpiece, the progress etched can be controlled.In addition, in upgrading region, due to overlapping each other viewed from direction, a side at least partially of adjacent upgrading point, therefore can form preset lines along upgrading region, connect well by multiple upgrading point or from the be full of cracks that this upgrading point extends.Therefore, even if when the selective etch in upgrading region is along the direction progress tilted relative to thickness direction, it also can be made not interrupt and be in progress well.Consequently, the part corresponding to space in workpiece can be removed accurately, form space accurately at workpiece.
In addition, in order to play above-mentioned action effect well, specifically, upgrading region formation process can comprise following operation: observe with a part for adjacent upgrading point the mode overlapped each other from direction, a side, allows multiple upgrading point stagger in a thickness direction while form preset lines along upgrading region and formed.Now, in the formation process of upgrading region, exist workpiece, the focal point of laser is moved while irradiate the situation of this laser along another direction, side orthogonal with direction, a side.
In addition, in order to play above-mentioned action effect well, specifically, upgrading region formation process can comprise following operation: formed multiple using the upgrading point along continuously arranged more than 2 of direction, a side as upgrading point group, and in the mode that a part for a pair adjacent upgrading point group overlaps each other viewed from thickness direction, multiple upgrading point group is staggered on direction, a side while form preset lines along upgrading region and formed.Now, in the formation process of upgrading region, exist for workpiece, the focal point of laser is moved while irradiate the situation of this laser along direction, a side.
In addition, upgrading region formation process can comprise: the 1st operation, the mode overlapped each other viewed from direction, a side with a part for adjacent upgrading point, allows multiple upgrading point stagger in a thickness direction while form preset lines along upgrading region and formed; And the 2nd operation, formed multiple using the upgrading point along continuously arranged more than 2 of direction, a side as upgrading point group, and in the mode that a part for a pair adjacent upgrading point group overlaps each other viewed from thickness direction, allow multiple upgrading point group stagger on direction, a side while form preset lines along upgrading region and formed.In this case, by suitably implementing the 1st and the 2nd operation in upgrading region formation process, the etching progress of etch processes operation can be controlled, adjust the aperture formed.This is because find such feature: in the etching along the upgrading region formed by the 1st operation and the etching along the upgrading region that the 2nd operation is formed, its etch-rate is different each other.
In addition, formation preset lines in upgrading region can extend along (111) face of workpiece.In this case, minute surface (mirror face) is formed with the angle of 35 ° at hole inner face relative to thickness direction.In addition, there is the situation on the surface of workpiece and the through hole of backside openings in space.
According to the present invention, can form at workpiece the space tilted relative to the thickness direction of workpiece accurately.
Fig. 1 is the summary construction diagram of the laser processing device that the formation in upgrading region uses.
Fig. 2 is the plane of the workpiece of the object of the formation becoming upgrading region.
Fig. 3 is the sectional view of the III-III line of workpiece along Fig. 2.
Fig. 4 is the plane of the workpiece after Laser Processing.
Fig. 5 is the sectional view of the V-V line of workpiece along Fig. 4.
Fig. 6 is the sectional view of the VI-VI line of workpiece along Fig. 4.
Fig. 7 (a) is used to the cross-sectional perspective view of the workpiece of the laser processing of explanation the 1st embodiment, Fig. 7 (b) is the cross-sectional perspective view of the follow-up workpiece representing Fig. 7 (a), and Fig. 7 (c) is the cross-sectional perspective view of the follow-up workpiece representing Fig. 7 (b).
Fig. 8 (a) is the sectional view of the follow-up workpiece representing Fig. 7 (c), and Fig. 8 (b) is the sectional view of the follow-up workpiece representing Fig. 8 (a).
Fig. 9 (a) is used to the cross-sectional perspective view of the workpiece of the laser processing involved by explanation the 2nd embodiment, Fig. 9 (b) is the cross-sectional perspective view of the follow-up workpiece representing Fig. 9 (a), and Fig. 9 (c) is the cross-sectional perspective view of the follow-up workpiece representing Fig. 9 (b).
Figure 10 is used to the sectional view of the workpiece of the laser processing involved by explanation the 3rd embodiment.
Figure 11 is the sectional view of the follow-up workpiece representing Figure 10.
Figure 12 is the sectional view of the follow-up workpiece representing Figure 11.
1 ... workpiece, 3 ... surface, 5b ... upgrading region forms preset lines, 7,7A, 7B, 71,72A, 72B, 73A, 73B, 74 ... upgrading region, 10 ... upgrading point group, 21 ... the back side, 24b ... the rake (space), 241 ~ 244 of through hole ... through hole (space), L ... laser, S ... upgrading point.
Below, explain preferred embodiment of the present invention with reference to accompanying drawing.Further, in the following description, give same symbol to same or suitable key element, omit repeat specification.
In the laser processing involved by present embodiment, laser focusing is formed upgrading region in the inside of workpiece.Therefore, first for the formation in upgrading region, be described following with reference to Fig. 1 ~ Fig. 6.
As shown in Figure 1, laser processing device 100 possesses: laser L carried out the LASER Light Source 101 of impulse hunting, be configured to the optical axis of laser L (light path) direction changed the spectroscope 103 of 90 ° and be used for the optically focused lens 105 of laser L optically focused.In addition, laser processing device 100 possesses: be used for supporting by by the laser L after optically focused lens 105 optically focused irradiate workpiece 1 supporting station 107, be used for making the microscope carrier 111 of supporting station 107 movement, in order to regulate the output of laser L, pulsewidth etc. control the LASER Light Source control part 102 of LASER Light Source 101 and control the microscope carrier control part 115 of movement of microscope carrier 111.
In this laser processing device 100, from the laser L that LASER Light Source 101 penetrates, after its optical axis direction being changed 90 ° via spectroscope 103, be concentrated on the inside of tabular workpiece 1 placed on supporting station 107 by optically focused lens 105.Meanwhile, allow microscope carrier 111 move, make workpiece 1 form preset lines 5 relative movement relative to laser L along upgrading region.Thus, the upgrading region forming preset lines 5 along upgrading region is made to be formed at workpiece 1.
As workpiece 1, can semi-conducting material, piezoelectric etc. be used, as shown in Figure 2, be set with upgrading region at workpiece 1 and form preset lines 5.Here it is imaginary lines that linearity extends that upgrading region forms preset lines 5.When the inside of workpiece 1 forms upgrading region, as shown in Figure 3, under the state of focal point P in alignment with workpiece 1 inside, laser L is made to form preset lines 5(namely along upgrading region, on the arrow A direction of Fig. 2) relatively move.Thus, as shown in Fig. 4 ~ Fig. 6, form preset lines 5 along upgrading region and form upgrading region 7 in the inside of workpiece 1, this upgrading region 7 becomes the removing region 8 realized by aftermentioned etching (etching).
Further, focal point P refers to the position of laser L institute optically focused.In addition, upgrading region forms preset lines 5 and is not limited to linearity, can be curve-like, and also can be the 3 dimension shapes that these are combined into, can also be the shape that coordinate is specified.In addition, there is situation about being formed continuously in upgrading region 7, also has interrupted situation about being formed.In addition, upgrading region 7 can be column-shaped, point-like, in a word, as long as upgrading region 7 is at least formed at the inside of workpiece 1.In addition, have with upgrading region 7 for starting point and form the situation of be full of cracks, the outer surface (surface, the back side or side) of workpiece 1 can be exposed in be full of cracks and upgrading region 7.
Incidentally, laser L is here through workpiece 1 and absorbed near the focal point of workpiece 1 inside especially, forms upgrading region 7(namely thus, the Laser Processing of absorbed inside type at workpiece 1).Generally speaking, when forming removing unit (Laser Processing of Surface absorption type) of hole, groove etc. when being melted removing from surface 3, machining area carries out towards rear side gradually from surperficial 3 sides.
Further, the upgrading region 7 of present embodiment refers to that density, refractive index, mechanical strength or other physical characteristics become the region from different states around.As upgrading region 7, such as, there are melt process region, slight crack region, insulation breakdown region, variations in refractive index region etc., also have these regions to mix the region existed.Moreover, as upgrading region 7, the region having the material Midst density of workpiece 1 to change compared with the density in non-upgrading region, the region (these being referred to as high density transport zone) being formed with lattice defect.
In addition, the density in melt process region or variations in refractive index region, upgrading region 7 changes compared with the density in non-upgrading region region, the region that is formed with lattice defect have and comprise the situation of chap (crackle, hallrcuts) in the inside in these regions or upgrading region 7 with the interface in non-upgrading region further.The be full of cracks comprised has throughout the comprehensive of upgrading region 7 or is only formed at a part or is formed at multiple part.As workpiece 1, such as, can enumerate the workpiece comprising silicon or be made up of silicon.
Here, in the present embodiment, after workpiece 1 forms upgrading region 7, etch processes is implemented to this workpiece 1, thus along upgrading region 7(namely, along upgrading region 7, be full of cracks that upgrading region 7 comprises or the be full of cracks from upgrading region 7) be in progress with making etching selectivity, and the part along upgrading region 7 of workpiece 1 to be removed.Further, this be full of cracks is also referred to as (being only called below " be full of cracks ") such as slight crack, micro-fractures, crackles.
In the etch processes of present embodiment, such as, be utilize capillarity etc., the be full of cracks that the upgrading region 7 making etchant be infiltrated on workpiece 1 comprises or the be full of cracks from this upgrading region 7, make etching be in progress along be full of cracks face.Thus, in workpiece 1, along chapping optionally and allowing etching be in progress with fast etch-rate (etching speed) and remove.Meanwhile, utilize the feature that the etch-rate in upgrading region 7 itself is so soon, optionally make along upgrading region 7 etching be in progress and remove.
As etch processes, there is the situation (impregnation method: Dipping) that such as workpiece 1 be impregnated in etchant and make workpiece 1 rotate the situation (spin etch mode: Spin Etching) being coated with etchant.
As etchant, such as, can enumerate: KOH(potassium hydroxide), TMAH(tetramethylammonium hydroxide aqueous solution), EDP(ethylene diamine pyrocatechol), NaOH(NaOH), CsOH(cesium hydroxide), NH 4oH(ammonium hydroxide), diamine etc.In addition, as etchant, can be not only liquid, also can use gel (gluey, semi-solid).Here etchant uses at the temperature about normal temperature ~ 100 DEG C, can be set to suitable temperature according to required etch-rate etc.Such as, when workpiece 1 KOH will formed by silicon carries out etch processes, preferably, about 60 DEG C are set as.
In addition, in the present embodiment, as etch processes, the etching based on the etch-rate of the specific direction of crystal orientation fast (or slow) and anisotropic etching process is carried out.When carrying out this anisotropic etching process, not only going for thinner workpiece, also going for thicker workpiece (such as thickness 800 μm ~ 100 μm).In addition, in this case, even if the face forming upgrading region 7 is different from orientation, face, also etching can be carried out along this upgrading region 7.That is, in anisotropic etching process here, except being etched with of the orientation, face according to crystal orientation, the etching not relying on crystal orientation can also be carried out.
Then, the laser processing for the 1st embodiment is described in detail.Fig. 7,8 are used to the flow chart that present embodiment is described.Further, in the present embodiment, laser L is pulse laser.
Present embodiment is such as the processing method doubling element, interpolater (Interposer) etc. and use in order to manufacture photoelectricity.Particularly in the present embodiment, as Fig. 7, shown in 8, by laser L is concentrated on workpiece 1, form multiple upgrading point (spot) S in the inside of workpiece 1, form upgrading region 7 by this multiple upgrading point S.Then, utilize anisotropic etching the part along upgrading region 7 of workpiece 1 to be removed, form the through hole 24 as angling hole comprising the space tilting to extend relative to the thickness direction of workpiece 1 thus at workpiece 1.
Here through hole 24, as shown in Fig. 8 (b), be configured to be included in the line part 24a that surface 3 side end of workpiece 1 and the back side 21 side end are formed, 24a and at these line parts 24a, the rake formed between 24a (space) 24b.Line part 24a extends along thickness direction.Rake 24b is continuously in line part 24a, 24a, and the mode along (111) face of workpiece 1 above extends at the direction tilted towards X-direction relative to Z-direction (hereinafter referred to as " incline direction ").Such as, rake 24b is 35 ° relative to the angle of thickness direction (Z-direction).
Incidentally, in the following description, as illustrated, the thickness direction (direction of illumination of laser L) of workpiece 1 is set to Z-direction, the direction, side that upgrading region forms the side that preset lines 5 (through hole 24) tilts relative to thickness direction is set to X-direction (direction, a side), will with X, the orthogonal direction of Z-direction is set to Y-direction (another direction, side).
As shown in Fig. 7 (a), workpiece 1 is the silicon substrate transparent relative to the wavelength (such as 1064nm) of irradiated laser L, has the surface 3 and the back side 21 that become (100) face.At this workpiece 1, corresponding to the position of through hole 24, upgrading region is formed preset lines 5 and is specified by 3 dimension coordinates and set with stylizing.Here, upgrading region forms preset lines 5 and comprises: form preset lines 5a along the upgrading region that thickness direction extends in the side, surface 3 of workpiece 1 and side, the back side 21 and between these along the upgrading region formation preset lines 5b that (111) face tilt of workpiece 1 extends.
In the present embodiment, when processing workpiece 1, first, the side, surface 3 of workpiece 1 is loaded this workpiece 1 be held in mounting table upward.Then, by the back side 21 side of the focal point (only claiming " focal point " below) of laser L in alignment with the inside of workpiece 1, while make focal point move in the Y direction, carry out ONOFF irradiation (scanning of Y-direction) of laser L from surperficial 3 sides in the mode along upgrading region formation preset lines 5a formation upgrading point S.Thus, make laser L be concentrated on the side, the back side 21 of workpiece 1, form the upgrading point S being exposed to the back side 21.
Further, define the upgrading point S that X-direction width is 10 μm here.In addition, at upgrading point S, comprise and be formed with the be full of cracks (following upgrading point S is also same) produced from this upgrading point S.In addition, carry out in the Y direction scanning (in a word in the mode of the spacing of focal point (spacing of upgrading point S) about 0.25 μm, laser irradiation is carried out with 0.25 μm of interval, correspond to and swash light-struck number of times and form multiple upgrading point S), the mode that a part of irradiating the upgrading point S formed by laser overlaps each other in the Y direction forms multiple upgrading point S.
Then, make focal point move ormal weight towards the side, surface 3 of Z-direction, implement the scanning of above-mentioned Y-direction in the mode forming preset lines 5a formation upgrading point S along upgrading region.Thus, the part that the line part 24a along the side, the back side 21 with through hole 24 is corresponding, newly forms upgrading point S in the side, surface 3 of existing upgrading point S, makes upgrading point S or form preset lines 5 from the be full of cracks of this upgrading point S along upgrading region to be connected to each other.
Then, as shown in Figure 7 (b) shows, make focal point move ormal weight towards the side, surface 3 of Z-direction, and after moving ormal weight in the X direction, implement the scanning of above-mentioned Y-direction.Specifically, based on following formula (1), make focal point move ormal weight Δ Z in z-direction and after moving ormal weight Δ X in the X direction, the mode forming upgrading point S to form preset lines 5b along upgrading region implements the scanning of above-mentioned Y-direction.Then, from workpiece 1, sequentially repeatedly implement the movement of this focal point and the scanning of Y-direction from side, the back side 21 toward surperficial 3 sides based on following formula (2), number of scans is Ns.
ΔZ=ΔX/tanθ …（1）
Ns=T/ΔZ …（2）
Wherein, Δ X=setting (such as 3 μm)
θ=upgrading region forms the angle of preset lines 5 relative to Z-direction
The Z-direction thickness of T=rake 24b
Thus, the mode overlapped each other viewed from X-direction with a part of adjacent upgrading point S forms multiple upgrading point S continuously.Specifically, while the mode overlapped each other viewed from X-direction with a part of adjacent upgrading point S staggers in a thickness direction, while form line 5b along workpiece to form multiple upgrading point S stepwise, and make upgrading point S or form preset lines 5 from the be full of cracks of this upgrading point S along upgrading region to be connected to each other.
Then, as shown in Fig. 7 (c), focal point is moved ormal weight towards the side, surface 3 of Z-direction, implement the scanning of above-mentioned Y-direction in the mode forming preset lines 5a formation upgrading point S along upgrading region.Thus, along the part that the line part 24a of the side, surface 3 with through hole 24 is corresponding, newly form in the side, surface 3 of existing upgrading point S the upgrading point S exposing this surface 3 continuously, make upgrading point S or form preset lines 5 from the be full of cracks of this upgrading point S along upgrading region to be connected to each other.Thus, in the part corresponding with through hole 24 of workpiece 1, form multiple continuous print upgrading point S and form upgrading region 7A.
Then, to workpiece 1, such as, the KOH of 85 DEG C is used to use as etchant and implement anisotropic etching process.Thus, as shown in Figure 8 (a), etchant is entered from surface 3 and the back side 21 and is infiltrated on upgrading region 7 in workpiece 1, then, from surperficial 3 sides and side, the back side 21 inwardly, make along upgrading region 7 etching selectivity be in progress (carrying out).Its result, as shown in Figure 8 (b) shows, the part along upgrading region 7 of workpiece 1 is removed, and completes the formation of through hole 24.
Now, in the anisotropic etching that workpiece 1 is implemented, utilize etch-rate to depend on this feature of crystal orientation of workpiece 1, the progress of the selective etch along upgrading region 7 can be controlled well.That is, in (111) face of workpiece 1, its etch-rate is slack-off and etch self-stopping technology (etch stop) compared with other parts.Therefore, at the upgrading region 7(along (111) face namely, the upgrading region 7 corresponding to rake 24b), etch specific selection along its bearing of trend and be in progress at high speed, and the inner face of the rake 24b formed, its bight is removed and becomes level and smooth, can form minute surface at this inner face.
In addition, now, the upgrading region 7 of preset lines 5b is being formed along upgrading region, as described above, due to adjacent upgrading point S, S overlaps each other at least partially viewed from X-direction, and therefore upgrading point S or the be full of cracks from this upgrading point S can connect well along upgrading region formation preset lines 5b.Therefore, make the selective etch in upgrading region 7, even if also can not interrupt when being in progress towards incline direction and be in progress well.
Particularly present embodiment along upgrading region formed preset lines 5b upgrading region 7 in, as described above, formed because the mode overlapped each other viewed from X-direction with a part of adjacent upgrading point S allows multiple upgrading point S stagger in a thickness direction, therefore such as upgrading point S or the be full of cracks from this upgrading point S closely connect along upgrading region formation preset lines 5b, at upgrading point S, the unlikely stop of etchant between S and infiltrating is carried out, and etching in an inclined direction can not be interrupted and really and be in progress at high speed.
Therefore, according to the present embodiment, part corresponding with through hole 24 in workpiece 1 can be removed accurately, through hole 24 can be formed accurately at workpiece 1.In addition, easily can form the angle of expectation and the through hole 24 of length, the design freedom that workpiece 1 adds man-hour can be promoted.
In addition, as described above, upgrading region forms preset lines 5b and extends along (111) face of workpiece, at the upgrading point S that the part that the rake 24b of the through hole 24 with workpiece 1 is corresponding is formed, along workpiece (111) face and formed.Therefore, the cross sectional shape of rake 24b at the inner face of rake 24b, concavo-convex few even surface and minute surface can be formed, further, can be formed as rectangle (rhombus) shape.
Further, in the present embodiment, though upgrading point S exposing surface 3 and the back side 21, upgrading point S also can not be made to expose and the be full of cracks from upgrading point S is exposed.If make upgrading point S exposing surface 3 and the back side 21, then can increase the aperture opening ratio of formed through hole 24, such as, when present embodiment being applied to photoelectricity and doubling element, the capture rate of electronics can be improved.On the other hand, if do not make upgrading point S expose and make be full of cracks expose, then can suppress the expansion of the open side of through hole 24, the aperture of through hole 24 open side can be made identical with inner pore size.
Subsidiary one carries, the quantity of the upgrading point S that workpiece 1 is formed, the i.e. irradiation number of times (irradiation (shot) number of times) of laser L, be not limited to present embodiment, suitably can set according to the shape of through hole 24 (aperture, length and the angle etc. relative to Z-direction).
Then, the 2nd embodiment is described.Further, in description of the present embodiment, be described mainly for the difference with above-mentioned 1st embodiment.In addition, in the same manner as above-mentioned 1st embodiment, laser L is pulse laser.
Fig. 9 is used to the flow chart that present embodiment is described.The laser processing of present embodiment, as shown in Fig. 9 (a), first, focal point is made to aim at the side, the back side 21 of workpiece 1, while make this focal point move in the X direction, the ONOFF carrying out laser L from surperficial 3 sides to form mode preset lines 5a being formed upgrading point S in upgrading region irradiates (X-direction scanning).Thus, the upgrading point S of continuously arranged more than 2 is along the X direction allowed to be exposed to this back side 21 as upgrading point group 10 in the side, the back side 21 of workpiece 1 and to be formed.
In upgrading point group 10 here, the upgrading point S be set up in parallel is spaced apart 0.25 μm, overlaps each other (following identical) in a part of the upgrading point S of X-direction.Specifically, carry out scanning (in a word in the X direction with the spacing of focal point (spacing of upgrading point S) about 0.25 μm, laser irradiation is carried out with 0.25 μm of interval, correspond to and swash light-struck number of times and form multiple upgrading point S), form upgrading point group 10 with the part that 1 laser irradiates the upgrading point S formed in the mode that X-direction overlaps each other.
Then, allow focal point move ormal weight in Z-direction towards surperficial 3 sides, implement the scanning of above-mentioned X-direction in the mode forming preset lines 5a formation upgrading point group 10 along upgrading region.Thus, along the part that the line part 24a of the side, the back side 21 with through hole 24 is corresponding, form new upgrading point group 10 in the side, surface 3 of existing upgrading point group 10, make upgrading point S or form preset lines 5 from the be full of cracks of this upgrading point S along upgrading region to be connected to each other.
Then, as shown in Figure 9 (b), focal point is moved towards the side, surface 3 of Z-direction, implement the scanning of above-mentioned X-direction in the mode forming preset lines 5b formation upgrading point group 10 along upgrading region.Then, the Z-direction sequentially repeatedly implementing this focal point in workpiece 1 from side, the back side 21 toward surperficial 3 sides move and X-direction scanning repeatedly.Thus, along the part that the rake 24b with through hole 24 is corresponding, in workpiece 1, form multiple upgrading point group 10.Specifically, by multiple upgrading point group 10, while with a pair adjacent upgrading point group 10, the mode that a part of 10 overlaps each other viewed from Z-direction staggers in the X direction, formed while form preset lines 5b along upgrading region, make upgrading point S or form preset lines 5 from the be full of cracks of this upgrading point S along upgrading region to be connected to each other.
Now, in order to implement the anisotropic etching of back segment well, adjacent upgrading point group 10, from the overlap viewed from Z-direction, forms preset lines 5b based on the aperture of the rake 24b that will be formed and rake 24b(upgrading region) set relative to the angle of Z-direction.Here, adjacent upgrading point group 10 is formed in the mode of overlapping about 8 ~ 10 μm in the X direction.
Then, as shown in Figure 9 (c), focal point is moved towards the side, surface 3 of Z-direction, implement the scanning of above-mentioned X-direction in the mode forming preset lines 5a formation upgrading point S along upgrading region.Thus, along the part that the line part 24a of the side, surface 3 with through hole 24 is corresponding, form the upgrading point group 10 of new exposing surface 3 in the face side of existing upgrading point group 10, make upgrading point S or form preset lines 5 from the be full of cracks of this upgrading point S along upgrading region to be connected to each other.By more than, correspond to the part of through hole 24 at workpiece 1, form the upgrading point group 10 be made up of multiple upgrading point S continuously, and form upgrading region 7B.
Above, in the present embodiment, also can play the effect same with above-mentioned effect, the part corresponding to through hole 24 can be removed accurately, form through hole 24 accurately at workpiece 1 in workpiece 1.
In addition, in the present embodiment, as described above, by multiple upgrading point group 10, stagger in the X direction in the mode that a part for a pair adjacent upgrading point group 10 overlaps each other viewed from Z-direction, while form preset lines 5b along upgrading region and formed.Therefore, such as, in the upgrading region 7 forming preset lines 5b along upgrading region, upgrading point S and be full of cracks form preset lines 5b and closely connect along upgrading region, even if selective etch is in progress towards incline direction, also can makes the unlikely stop of etchant and infiltrate progress.Therefore, make this selective etch can not interruptedly in an inclined direction conscientiously and be in progress at high speed.Consequently, part that can be corresponding by the rake 24b with through hole 24 removes accurately, can form through hole 24 accurately.
In addition, in the present embodiment, as described above, owing to being that the X-direction of carrying out on one side allowing the focal point of laser L move along the X direction and irradiate this laser L on one side scans and forms upgrading region 7B, therefore can suppress the unhelpful movement (number of scans) of the focal point of laser L and process rapidly, can promote and produce apart from (tact time).In addition, no matter the length of through hole 24 or the angle relative to thickness direction, upgrading region 7B can both be formed with identical number of scans.
Further, upgrading point group 10 each the width of X-direction and the number (that is, the irradiation number of times of laser L) of upgrading point S, be not particularly limited, suitably can set according to the shape of through hole 24.About this point, be also same at following embodiment.
Secondly, the 3rd embodiment is described.Further, in description of the present embodiment, be described mainly for the difference with above-mentioned 1st embodiment.In addition, in the same manner as above-mentioned 1st embodiment, laser L is pulse laser.
Figure 10 ~ 12 figure is used to the flow chart that present embodiment is described.In the present embodiment, as shown in figure 12, the multiple through holes (space) 241 ~ 244 tilting to extend relative to Z-direction are formed at workpiece 1.Through hole 241 ~ 244, relative to Z-direction, it tilts to become large successively, and development length is also elongated successively.
In the present embodiment, as shown in Figure 10, based on through hole 241 ~ 244 development length and as following, suitably implement the scanning of the scanning of the above-mentioned Y-direction of above-mentioned 1st embodiment and the above-mentioned X-direction of above-mentioned 2nd embodiment, form upgrading region 7.Namely, as shown in Figure 10,12, the Z-direction repeatedly implementing focal point move and above-mentioned Y-direction scanning repeatedly, form the upgrading region 72A along the upgrading region 71 of the part corresponding with through hole 241, along part corresponding to surface 3 side end and the back side 21 side end with through hole 242 thus, 72A, along with near the side, surface 3 of through hole 243 and the upgrading region 73A of part corresponding near side, the back side 21,73A.
In upgrading region 71,72A, 73A, the mode overlapped each other viewed from X-direction with a part of adjacent upgrading point S, allows multiple upgrading point S stagger in a thickness direction and to be formed.Here, the development length of upgrading region 72A is longer than the development length of upgrading region 73A.
Meanwhile, the Z-direction repeatedly implementing focal point move and above-mentioned X-direction scanning repeatedly, formed thus: along the upgrading region 72B of part corresponding to the Z-direction central portion with through hole 242, in through hole 243 and near surperficial 3 sides with side, the back side 21 near between the corresponding upgrading region 73B of part and the upgrading region 74 along the part corresponding with through hole 244.
At upgrading region 72B, 73B, in 74, the mode overlapped each other viewed from Z-direction with a part for adjacent a pair upgrading point group 10,10, allows multiple upgrading point group 10 stagger in the X direction and to be formed.Here, the development length of upgrading region 73B is longer than the development length of upgrading region 72B.
Then, as shown in Figure 11,12, anisotropic etching process is implemented to workpiece 1, etchant entered from surface 3 and the back side 21 and is infiltrated on upgrading region 7 in workpiece 1, being in progress with making etching selectivity along upgrading region 7.
Here, such feature can be found: the upgrading region 71,72A formed along the scanning by above-mentioned Y-direction, the etching of 73A and along the upgrading region 72B that the scanning by above-mentioned X-direction is formed, 73B, in the etching of 74, its etch-rate is different from each other.Specifically, can find such feature: the connected mode etc. such as depending on upgrading point S or be full of cracks, along upgrading region 72B, 73B, the etching of 74, its etch-rate is faster than the etch-rate along the etching in upgrading region 71,72A, 73A.
Therefore, in the anisotropic etching process of present embodiment, as shown in figure 11, along upgrading region 72B, 73B, the etching of 74 is in progress quickly than the etching along upgrading region 71,72A, 73A.That is, etching progress is controlled to, to make in the middle of through hole 241 ~ 244 development length more elder formed with faster etch-rate.Consequently, as shown in figure 12, adjustment etching completes the time required for (through hole 241 ~ 244 through), allows the formation of through hole 241 ~ 244 complete in the mode that aperture is consistent with each other roughly simultaneously.
Above, in the present embodiment, also can play the effect same with above-mentioned effect, the part corresponding to through hole 241 ~ 244 by workpiece 1 is removed accurately, and forms through hole 241 ~ 244 accurately at workpiece 1.
But in multiple through holes 241 ~ 244 that development length is different, usually different each other owing to having etched the required time, it is difficult that its aperture therefore will be made equal.For this point, in the present embodiment, as described above, implement the Laser Processing that combined by the scanning of X-direction and the scanning of Y-direction, for each of through hole 241 ~ 244, suitably form the fast upgrading region 72B of etch-rate, 73B, 74 and the slow upgrading region 71,72A, 73A of etch-rate.Thus, the etching of adjustment through hole 241 ~ 244 completes the required time, the size desired by its pore size control can being become.
Especially, in the present embodiment, as described above, in the middle of through hole 241 ~ 244, length gets over elder, the upgrading region 7 making etch-rate fast in the part corresponding with it is increased (reduce etch-rate slow upgrading region 7) and formed, and makes etching complete the required time equal.Thus, the aperture of through hole 241 ~ 244 can be made to become mutually the same.
Above, be illustrated for preferred embodiment, but the present invention is not limited to above-mentioned embodiment, can be out of shape or be applicable to other modes in the scope not changing the purport described in each claim.
Such as, form laser entrance face during upgrading region 7, being not limited to the surface 3 of workpiece 1, also can be the back side 21 of workpiece 1.In addition, in the above-described embodiment, define through hole 24 at workpiece 1, replace, also can form the non-through hole only on surface 3 or the back side 21 opening, groove (channel) or slit can be formed in addition.In a word, as long as form the space extended towards incline direction relative to Z-direction.In addition, in the above-described embodiment, can the through hole 24 of round-shaped, the various cross sectional shape such as cross section elliptical shape or section polygon shape of Formation cross-section.
In addition, in the above-described embodiment, the rake 24b of through hole is tilt with 35 ° (orientation angles in (111) face) relative to Z-direction, but angle of inclination is not limited thereto, also can relative to Z-direction with 10 ° or 45 ° of inclinations.In this case, multiple stage rank (terrace structure) can be formed at the inner face of rake 24b.
Have again, owing to passing through to add the etch-rate that additive can change specific crystal orientation in etchant, therefore in order to carry out anisotropic etching process with the etch-rate expected, the additive corresponding with the crystal orientation in workpiece 1 can be added into etchant.
1. a laser processing, is characterized in that,
Upgrading region formation process, by by the workpiece of laser focusing in the tabular formed by silicon, roll oblique upgrading region along the thickness direction relative to described workpiece towards a side and form preset lines, form multiple upgrading point in the inside of described workpiece, form upgrading region by these multiple described upgrading points; And
Etch processes operation, after the formation process of described upgrading region, anisotropic etching process is implemented to described workpiece, is in progress with making etching selectivity along described upgrading region thus, the space tilting to extend relative to described thickness direction is formed at described workpiece
In the formation process of described upgrading region, in the mode overlapped each other viewed from direction, a described side at least partially of adjacent described upgrading point, form multiple described upgrading point,
Described upgrading region formation process comprises following operation: the mode overlapped each other viewed from direction, a described side with a part for adjacent described upgrading point, allow multiple described upgrading point while stagger on described thickness direction while form preset lines along described upgrading region and formed
In the formation process of described upgrading region, to described workpiece, the focal point of described laser is moved while irradiate this laser along another direction, side orthogonal with direction, a described side.
2. laser processing as claimed in claim 1, is characterized in that,
Described upgrading region formation preset lines extends along (111) face of described workpiece.
3. laser processing as claimed in claim 1 or 2, is characterized in that,
4. a laser processing, is characterized in that,
Described upgrading region formation process comprises following operation: form multiple upgrading point group using the described upgrading point along continuously arranged more than 2 of direction, a described side as upgrading point group, and in the mode that a part for upgrading point group described in adjacent a pair overlaps each other viewed from described thickness direction, multiple described upgrading point group is staggered on direction, a described side while form preset lines along described upgrading region and formed.
5. laser processing as claimed in claim 4, is characterized in that,
In the formation process of described upgrading region, to described workpiece, the focal point of described laser is moved while irradiate this laser along direction, a described side.
6. laser processing as claimed in claim 4, is characterized in that,
7. laser processing as claimed in claim 5, is characterized in that,
8. the laser processing as described in any one in claim 4 to 7, is characterized in that,
Described space is the through hole of surface at described workpiece and backside openings.
9. a laser processing, is characterized in that,
Described upgrading region formation process comprises:
1st operation, the mode overlapped each other viewed from direction, a described side with a part for adjacent described upgrading point, allows multiple described upgrading point stagger on described thickness direction while form preset lines along described upgrading region and formed; And
2nd operation, multiple upgrading point group is formed as upgrading point group using the described upgrading point along continuously arranged more than 2 of direction, a described side, and in the mode that a part for upgrading point group described in adjacent a pair overlaps each other viewed from described thickness direction, allow multiple described upgrading point group stagger on direction, a described side while form preset lines along described upgrading region and formed.
10. laser processing as claimed in claim 9, is characterized in that,
11. laser processings as described in claim 9 or 10, is characterized in that,
CN201180036018.1A 2010-07-26 2011-07-19 Laser processing method CN103025471B (en)
JP2010-167427 2010-07-26
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