WO2020130165A1 - 취성재료의 레이저 절단 가공방법 - Google Patents
취성재료의 레이저 절단 가공방법 Download PDFInfo
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- WO2020130165A1 WO2020130165A1 PCT/KR2018/016062 KR2018016062W WO2020130165A1 WO 2020130165 A1 WO2020130165 A1 WO 2020130165A1 KR 2018016062 W KR2018016062 W KR 2018016062W WO 2020130165 A1 WO2020130165 A1 WO 2020130165A1
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- Prior art keywords
- laser beam
- brittle material
- processing method
- laser
- processed
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- 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
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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
- H01L21/67—Apparatus specially adapted for handling semiconductor or electric solid state devices during manufacture or treatment thereof; Apparatus specially adapted for handling wafers during manufacture or treatment of semiconductor or electric solid state devices or components ; Apparatus not specifically provided for elsewhere
-
- 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
- H01L21/71—Manufacture of specific parts of devices defined in group H01L21/70
- H01L21/76—Making of isolation regions between components
-
- 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
Definitions
- the present invention relates to a laser cutting processing method for brittle materials, and heats the inside of a non-metallic brittle material such as sapphire, silicon, or SiC wafer with a high-power laser beam, and immediately cools to melt, crack or micropores inside the non-metallic brittle material. It relates to a laser cutting processing method of a brittle material so that the object to be processed can be cut in any desired direction as well as in the crystal direction by generating a thermal shock without generating.
- a silicon wafer is formed by using a wavelength around 1 ⁇ m through which silicon is transmitted and condensing inside the wafer to continuously form a modified layer.
- it is necessary to apply a force in the direction of bending the wafer and propagate internal cracks. Therefore, if the tape attached to the back surface of the silicon wafer is separated and cut in parallel with the silicon wafer (expand method), yield is deteriorated.
- This conventional technique is called stealth cutting.
- This technique is a method of cutting the inside of the object to be cut by giving it melting and heat damage, which involves cracks and damage to the cut surface and requires additional post-treatment such as polishing. The case arises.
- the laser cutting processing method of the brittle material of the present invention devised to solve the problems of the prior art as described above is to be cut without generating cracks and damages inside by heating and cooling without melting the non-metallic brittle material to be processed. There is a purpose.
- the present invention has an object to cut a workpiece in a desired direction irrespective of the crystal orientation of the object to be processed, unlike mechanical cutting that is influenced by the crystal direction of the semiconductor wafer or LED material.
- the object of the present invention includes a step of laser cutting a brittle material, irradiating a laser beam in the cutting direction inside a non-metallic brittle material to be processed, and spraying a refrigerant to cool the laser irradiation area. It is achieved by a laser cutting processing method of a non-metallic material, characterized in that.
- the laser cutting processing method of the brittle material of the present invention has an effect that can be cut without generating thermal damage or thermal melting inside the non-metallic brittle material to be processed.
- the present invention has another effect capable of cutting the object to be processed in a desired direction regardless of the crystal direction of the brittle material that is the object to be processed.
- FIG. 2 is an exemplary configuration for forming a laser beam irradiation area and a cooling area according to a first embodiment of the present invention
- Figure 3 is a surface, cross-section and internal temperature distribution of the object to be processed according to the first embodiment of the present invention
- FIG. 4 is an exemplary configuration for forming a laser beam irradiation area and a cooling area according to a second embodiment of the present invention
- FIG. 5 is a surface, cross-sectional and internal temperature distribution diagram of a workpiece according to a second embodiment of the present invention.
- FIG 2 is an exemplary view for configuring a laser beam irradiation area and a cooling area according to a first embodiment of the present invention.
- the present invention is due to the reduction of the strength of the cutting material due to cracks, impurity particles, etc. generated when cutting a brittle material by conventional techniques such as sapphire, silicon, SiC wafer, etc.
- irradiating a laser beam in the cutting processing direction inside the object to be processed which is a brittle material such as sapphire, silicon, or SiC wafer, and spraying a refrigerant to cool the laser beam irradiation area.
- the laser beam irradiated in the cutting direction of the object to be processed is a pulse laser or a continuous wave laser, with a wavelength of more than 0.2 to less than 11 ⁇ m and 1 ⁇ 10 2 (mW/ It is irradiated with an energy density of 3 mm or more, and the laser beam irradiated to the object to be processed is a laser beam of a wavelength that allows a certain amount of absorption under the surface of the object to be processed.
- this laser beam is a high-power laser beam
- a heat shock is generated by heating the inside of the cutting direction of the object to be processed, so that the object to be processed can be cut in any desired direction, not only in the crystal direction, but also in the continuous laser beam.
- the cooling zone is formed by the cooling means so that the thermal shock caused by irradiation does not propagate in a direction other than the cutting processing direction.
- the cutting direction is determined irrespective of the crystal direction of the brittle material, compared to the general cutting process processed along the crystal direction, and is cut by thermal shock inside the brittle material.
- the laser beam is irradiated to the surface of the object to be processed.
- a cooling area is formed to cool the entire laser beam irradiation area.
- FIG. 3 is a surface, cross-sectional and internal temperature distribution diagram of the object to be processed according to the first embodiment of the present invention.
- FIG. 3(a) shows a laser beam irradiation area and a cooling area formed on the surface of the object to be processed
- FIG. 3(b) is a cross-section of the object to be cut
- FIG. 3(c) Shows the distribution of the internal temperature of the object to be processed by irradiation of the laser beam and cooling of the cooling means.
- the object to be processed which is the brittle material shown in FIG. 3(b), has a thickness H, and in FIG. 3(a), the laser beam irradiation area irradiated to the surface of the object to be processed is perpendicular to the horizontal length L and the cutting direction L in the cutting direction. It has been shown to have the shape of an ellipse created by the vertical length W of.
- the shape of the laser beam irradiation region can be changed according to the shape of use, such as a rectangle, as well as an ellipse.
- the laser beam is irradiated so that the surface of the object to be processed has an elliptical laser beam irradiation area S, and the laser beam is absorbed in the thickness H direction of the object to be processed and the total absorbed laser beam has a volume V. .
- the cooling region can be formed in various directions, but more preferably, the L of the laser beam irradiation region is more preferably formed in an elliptical or rectangular shape having a length of 2 to 200 times W.
- the cooling region is more preferably formed to be more biased toward the local region at the end of the cutting direction of the object to be processed, even when forming a cooling region for cooling the entire laser beam irradiation region.
- FIG. 3(b) is an exaggerated illustration of the cooling region formed on the surface in order to highlight the features of the present invention.
- FIG. 4 is an exemplary view for forming a laser beam irradiation area and a cooling area according to a second embodiment of the present invention
- FIG. 5 is a surface, cross-sectional and internal temperature distribution diagram of a processing object according to the second embodiment of the present invention .
- the cooling area for the laser beam irradiation area of the object to be processed transmits the laser beam and is formed locally at the end of the laser beam irradiation area in the cutting direction of the laser beam irradiation area.
- cooling region of the type shown in FIG. 3, but it is necessary to form a partial cooling region rather than the entire laser beam irradiation region according to the properties of the object to be processed, which is the internal temperature of the object to be processed. It goes without saying that the size of the cooling zone can be changed according to the characteristics of the distribution diagram.
- FIG. 5(b) exaggerates the cooling region formed on the surface in order to highlight the features of the present invention.
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Condensed Matter Physics & Semiconductors (AREA)
- General Physics & Mathematics (AREA)
- Manufacturing & Machinery (AREA)
- Computer Hardware Design (AREA)
- Power Engineering (AREA)
- Plasma & Fusion (AREA)
- Mechanical Engineering (AREA)
- Optics & Photonics (AREA)
- Processing Of Stones Or Stones Resemblance Materials (AREA)
- Laser Beam Processing (AREA)
Abstract
Description
Claims (10)
- 취성재료의 레이저 절단 가공방법에 있어서,취성재료인 가공대상물 내부에 절단가공방향으로 레이저 빔을 조사하며, 상기 레이저 빔 조사영역을 냉각할 수 있도록 냉매를 분사하는 단계를 포함하는 것을 특징으로 하는 취성재료의 레이저 절단 가공방법.
- 제1항에 있어서,상기 레이저 빔은 0.2 초과 내지 11㎛ 미만의 파장 및 상기 가공대상물 내부에 1×102(mW/mm3) 이상의 에너지 밀도로 조사되는 것을 특징으로 하는 취성재료의 레이저 절단 가공방법.
- 제1항에 있어서,상기 가공대상물은 두께 H를 가지며, 상기 가공대상물 표면에 조사되는 영역은 절단방향의 가로 길이 L 및 절단방향 L에 대하여 수직 방향의 세로 길이 W에 의해서 만들어지는 타원 또는 직사각형의 레이저 빔에 의해서 상기 가공대상물 표면에 S의 조사 면적으로 상기 레이저 빔이 조사되고, 상기 레이저 빔이 상기 가공대상물 두께 H 방향으로 흡수되며 가공대상물의 총 흡수되는 레이저 빔은 부피 V를 가지는 것을 특징으로 하는 취성재료의 레이저 절단 가공방법.
- 제3항에 있어서,상기 레이저 빔이 흡수되는 부피인 V에 흡수되는 열량과 비례하도록 냉각영역에 대하여 상기 냉매의 분사에 의한 냉각량을 증가시키는 것을 특징으로 하는 취성재료의 레이저 절단 가공방법.
- 제4항에 있어서,상기 냉각영역은 상기 레이저 빔 조사영역의 L은 W의 2 내지 200배의 길이를 가지는 타원 또는 직사각형 영역인 것을 특징으로 하는 취성재료의 레이저 절단 가공방법.
- 제4항에 있어서,상기 냉각영역은 상기 레이저 빔을 투과하고, 상기 레이저 빔 조사영역 전체를 냉각시키거나 절단 방향의 상기 레이저 빔 조사영역의 끝 국부영역으로 조금 더 치우치도록 형성되는 것을 특징으로 하는 취성재료의 레이저 절단 가공방법.
- 제1항에 있어서,상기 레이저 빔은 펄스 또는 연속파인 것을 특징으로 하는 취성재료의 레이저 절단 가공방법.
- 제1항에 있어서,상기 레이저 빔은 상기 가공대상물 표면 밑으로 일정량이 흡수되는 파장의 레이저인 것을 특징으로 하는 취성재료의 레이저 절단 가공방법.
- 제1항에 있어서,상기 절단가공방향은 상기 취성재료의 결정방향과 무관하게 결정되며, 상기 취성재료 내부의 열충격으로 절단가공되는 것을 특징으로 하는 취성재료의 레이저 절단 가공방법.
- 제1항에 있어서,상기 취성재료의 절단가공 시작부분에서 상기 취성재료 내부의 열충격 생성을 용이하기 위하여 기계식 휠 또는 레이저로 미리 미세한 크랙을 발생시키는 것을 특징으로 하는 취성재료의 레이저 절단 가공방법.
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Citations (5)
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KR100302825B1 (ko) * | 1992-04-02 | 2001-12-01 | 주르겐 브렌델 | 취성비금속재료의절단방법 |
KR100794284B1 (ko) * | 2001-09-29 | 2008-01-11 | 삼성전자주식회사 | 비금속 기판 절단 방법 |
JP2009066613A (ja) * | 2007-09-11 | 2009-04-02 | Mitsuboshi Diamond Industrial Co Ltd | 脆性材料基板の分断装置および分断方法 |
KR100958745B1 (ko) * | 2009-11-30 | 2010-05-19 | 방형배 | 레이저를 이용한 스크라이빙 장치, 방법 및 스크라이빙 헤드 |
KR101119289B1 (ko) * | 2003-07-18 | 2012-03-15 | 하마마츠 포토닉스 가부시키가이샤 | 절단방법 |
-
2018
- 2018-12-18 WO PCT/KR2018/016062 patent/WO2020130165A1/ko active Application Filing
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
KR100302825B1 (ko) * | 1992-04-02 | 2001-12-01 | 주르겐 브렌델 | 취성비금속재료의절단방법 |
KR100794284B1 (ko) * | 2001-09-29 | 2008-01-11 | 삼성전자주식회사 | 비금속 기판 절단 방법 |
KR101119289B1 (ko) * | 2003-07-18 | 2012-03-15 | 하마마츠 포토닉스 가부시키가이샤 | 절단방법 |
JP2009066613A (ja) * | 2007-09-11 | 2009-04-02 | Mitsuboshi Diamond Industrial Co Ltd | 脆性材料基板の分断装置および分断方法 |
KR100958745B1 (ko) * | 2009-11-30 | 2010-05-19 | 방형배 | 레이저를 이용한 스크라이빙 장치, 방법 및 스크라이빙 헤드 |
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