WO2004070370A1 - ウエハ検査装置 - Google Patents
ウエハ検査装置 Download PDFInfo
- Publication number
- WO2004070370A1 WO2004070370A1 PCT/JP2004/001264 JP2004001264W WO2004070370A1 WO 2004070370 A1 WO2004070370 A1 WO 2004070370A1 JP 2004001264 W JP2004001264 W JP 2004001264W WO 2004070370 A1 WO2004070370 A1 WO 2004070370A1
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- WO
- WIPO (PCT)
- Prior art keywords
- wafer
- outer peripheral
- peripheral edge
- semiconductor wafer
- notch
- Prior art date
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Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/84—Systems specially adapted for particular applications
- G01N21/88—Investigating the presence of flaws or contamination
- G01N21/95—Investigating the presence of flaws or contamination characterised by the material or shape of the object to be examined
- G01N21/9501—Semiconductor wafers
- G01N21/9503—Wafer edge inspection
Definitions
- the present invention relates to a wafer inspection device, and more particularly, to a wafer inspection device that inspects a semiconductor wafer for a damage at an outer peripheral edge portion.
- an inspector irradiates the wafer with light using an illumination system, directly looks at the outer periphery of the wafer, and detects a chipped portion (a chipped portion such as a chip or a scratch). ) Is detected.
- This conventional technique is a wafer edge defect inspection apparatus for inspecting whether or not there is a crack (crack) in an outer peripheral edge portion of a wafer.
- This edge defect inspection apparatus vertically incidents parallel light on the end face of the outer peripheral edge of the wafer, and condenses and detects higher-order diffracted light among the reflected light from the end face with an elliptical mirror. Defects and properties of the end face are specified and inspected from the light intensity and / or frequency components.
- this end-face defect inspection device can detect fine scratches other than chipping at the edge of the outer peripheral edge of the wafer with high sensitivity, and as a result, detect defects that do not lead to defective products. There is.
- the end face defect inspection apparatus may not be able to find a planar chip that does not generate high-order diffraction light.
- Patent Document 1 Japanese Patent Application Laid-Open No. Hei 9-26969298 Disclosure of the Invention
- An object of the present invention is to quickly and reliably detect a chip (defect) at an outer peripheral edge of a semiconductor wafer.
- a semiconductor wafer placed on a turntable is provided.
- the inspection light from the light projecting means is projected on the outer peripheral wedge portion of the c, and the inspection light projected on the outer peripheral wedge portion is detected by the detecting means.
- the defect of the outer peripheral edge portion of the semiconductor wafer is determined from the detection signal of the detecting means by the determining means. Therefore, it is possible to quickly and reliably detect a defect in the outer edge portion of the semiconductor wafer.
- the discriminating means discriminates the reference notch of the semiconductor wafer and the notch other than the reference notch from the detection signal of the detecting means. Therefore, even if the reference notch exists, the notch in the outer peripheral edge of the semiconductor wafer can be quickly and reliably detected. .
- a detection signal is differentiated, and a discrimination between a reference notch and a notch is performed based on the differentiated value. Therefore, it is possible to determine the reference notch and the notch with high accuracy.
- the coordinates of the notch of the semiconductor wafer are obtained by the position detecting means with reference to the reference notch. Then, using the coordinates of the chipped portion of the semiconductor wafer detected by the position detecting means, the chipped portion of the semiconductor wafer is moved to a predetermined position, and the micro inspection is performed. Therefore, micro inspection can be performed easily and reliably.
- the quality of the semiconductor wafer is determined from the relative position between the reference notch and the notch of the semiconductor wafer by the determining means. Therefore, it is possible to effectively prevent the semiconductor wafer from being unusable due to the presence of the chipped portion where there is no possibility of breaking. .
- the pre-alignment unit when there is no chipped portion in the semiconductor wafer placed on the turntable, the pre-alignment unit performs the bri-alignment of the semiconductor wafer. Therefore, the semiconductor wafer can be easily and reliably aligned.
- FIG. 1 is a side view showing an embodiment of the wafer inspection apparatus of the present invention.
- FIG. 2 is a top view showing the wafer inspection apparatus of FIG.
- FIG. 3 is an explanatory diagram illustrating a detection signal detected by the detection unit in FIG.
- FIG. 4 is a block diagram showing the wafer inspection device of FIG.
- FIG. 5 is an explanatory diagram showing a differentiated signal obtained by differentiating the detection signal of FIG.
- FIG. 6 is an explanatory diagram showing coordinates when performing a micro inspection.
- FIG. 7 is an explanatory diagram showing coordinates when performing a bri-alignment.
- FIG. 8 is an explanatory diagram showing a relative positional relationship between a reference notch and a notch where no rupture occurs even if the notch exists.
- FIG 1 and 2 show an embodiment of the wafer inspection apparatus according to the present invention.
- the wafer inspection apparatus of this embodiment has a rotary table 13 on which a semiconductor wafer substrate (hereinafter, referred to as a wafer) 11 is placed.
- the rotary table 13 is supported by a rotary unit 17 via a rotary shaft 15.
- a motor 19 for rotating the rotating shaft 15 is arranged in the rotating section 17.
- the rotating section 17 is placed on the XY table 21 and is movable in the X and Y directions as shown in FIG.
- a light projecting system 2 3 for projecting light to the outer peripheral edge of the wafer 11 placed on the rotating table 13 is provided.
- a light projecting system 2 3 for projecting light to the outer peripheral edge of the wafer 11 placed on the rotating table 13 is provided.
- the light projecting system 23 has a light source 25 and a lens 27.
- the light source 25 a light emitting diode-laser diode or the like can be used.
- the lens 27 converts the light from the light source 25 into parallel light and emits the light to the outer periphery of the wafer 11.
- a detector 2 9 for receiving the light projected on the outer periphery of the wafer 11 mounted on the rotating table 13 are arranged.
- a CCD sensor that detects the boundary between light and negative light is used as the detection unit 29. That is, the detector 29 detects the amount of transmitted light that is not shielded by the wafer 11.
- a microscope 31 for micro-inspection of the wafer 11 is arranged on the side opposite to the light projecting system 23 above the surface of the wafer 11.
- the wafer 11 is rotated by mounting the wafer 11 on the rotary table 13 and rotating the rotation shaft 15 by the motor 19 of the rotation unit 17.
- the light source 25 is turned on, the light from the light projecting system 23 is dropped on the outer peripheral edge of the wafer 11, and part of the light is emitted by the outer peripheral edge of the wafer 11.
- the shielded light is detected by the detection unit 29.
- a reference notch 11 a formed of a notch is formed in the outer edge portion of the wafer 11. Further, in addition to the reference notch 11a, there is a notch 11b which is a defect.
- the wafer 11 is placed on the turntable 13 in the state shown in FIG. 2, and is rotated from this state in the direction of arrow E in FIG.
- FIG. 3 shows an example of a detection signal S 1 detected by the detection unit 29 when the wafer 11 rotates once from the measurement start point S with the light source 25 of the light projecting system 23 turned on. I have. ⁇
- the horizontal axis indicates the rotation angle of the wafer 11, that is, the 0 coordinate value of the rotation table 13, and the vertical axis indicates the value of a detection signal from the detection unit 29 including a CCD. .
- the value of the detection signal S 1 from the detector 29 is determined by the dark part (the part shielded by the outer periphery of the wafer 11) and the bright part (the outer part of the wafer 11) projected on the CCD that is the detector 29. (Parts not shaded).
- FIG. 4 shows a block diagram of the above-described wafer inspection apparatus.
- This wafer inspection apparatus has a discrimination unit 33, a position detection unit 35, a bri-alignment unit 37, and a micro inspection unit 39.
- the discriminating unit 33 receives the detection signal S1 of the detection unit 29, and based on the detection signal S1, the reference notch 14a of the wafer 11 and the notch 1 1 other than the reference notch 11a. j is determined.
- the discriminator 33 discriminates the detection signal S1 and discriminates between the reference notch 11a and the notch 11b based on the differential value.
- FIG. 5 shows a differentiated signal obtained by differentiating the detection signal S 1 shown in FIG. 3.
- the horizontal axis indicates the angular position of the wafer 11, that is, the ⁇ coordinate value of the rotary table 13, and the vertical axis indicates Indicates the differential value.
- the notch reference notch portion 11a Since the notch reference notch portion 11a is formed in a predetermined size and shape in advance, the size and shape of the reference notch portion 11a are almost the same for wafers 11 of the same type. Therefore, the shape of the differential signal (change in differential value) is almost the same if the wafers are of the same type.
- the change in the differential value is indicated by the width W1 and the height H1 shown in FIG.
- the value indicating the change in the differential value of the reference notch 11a is stored in the discriminator 33 in advance.
- the shape of the notch 1 lb differs depending on the situation, but in general, the width W 2 and the height H 2, which indicate the change in the differential value of the notch 1 1b, are The width W1 and the height HI, which are the values indicating the change in the differential value of the part 11a, are significantly different. Accordingly, the discriminating unit 33 calculates the width W1 and the height HI indicating the change in the differential value of the stored standard notch 11a and the width and height indicating the change in the differential value obtained from the differential signal. By comparing the value of the differential value with the value of, it is determined whether the changed portion of the differential value is the reference notch 11a or the notch 11b.
- the width W2 obtained from the differential signal is within an allowable range by comparing with the value of W1 stored in advance. Then, the height H 2 obtained from the differential signal is compared with a value of HI stored in advance to determine whether or not the height is within an allowable range. If both values are within the allowable range, that part is determined to be the reference notch 1 la. Either is acceptable If not, it is determined that the part is a defective part 11b.
- the size of the detectable chip 11b basically depends on the resolution of the CCD, which is the detector 29. It is.
- the position detection unit 35 is a reference notch 1 of the wafer 11 placed on the turntable 13.
- the coordinates of 1 a and the missing portion 1 1 b are detected.
- a signal indicating the 6 coordinates of the rotating tape gap 13 and a signal indicating the XY coordinates of the XY table 21 are input to the position detecting section 35 in accordance with the detection signal S 1 from the detecting section 29. I have.
- the signal indicating the 0 coordinate of the rotary table 13 is a signal output from the rotating unit 17, and the signal indicating the XY coordinate of the XY table 21 is a signal output from the XY table 21.
- the 0 coordinate of the rotary table 13 and the XY coordinate of the XY table 21 are stored corresponding to each signal position of the detection signal S1 in FIG.
- the position detecting portion 35 detects six coordinates and XY coordinates corresponding to the missing portion 11b. Then, the information of the ⁇ coordinates and the XY coordinates corresponding to the missing portion l i b is output to the micro-mouth inspection unit 39.
- the mixer mouth inspection unit 39 inspects the chipped portion 11b of the wafer 11 with the microscope 31. For this purpose, the notch 11b of the wafer 11 is moved to a predetermined position near the objective lens 31a of the microscope 31.
- the micro inspection unit 39 uses the coordinates of the missing portion 1 lb of the wafer 11 detected by the position detecting unit 35 to convert the notched portion 1 1b of the wafer 11 1 into the objective lens 3 1a of the microscope 31. Move to a nearby predetermined position.
- the coordinates of the notch 1 1b of the wafer 11 detected by the position detector 35 are as shown in FIG. 6 when the wafer 11 is rotated 360 degrees in the direction E from the state of FIG. , (X 2, Y 2, ⁇ 2).
- the predetermined position in the vicinity of is, for example, as shown in FIG. 6, (X3, Y3) with respect to the origin in the coordinate system of the XY table 21.
- the micro inspection unit 39 uses a predetermined program created in advance to replace the notch 11b of the wafer 11 at the current position (X2, Y2, ⁇ 2) with the position of the (X3, Y3). Then, the rotation angle of the rotary table 13 and the XY drive amount of the XY table 21 that can be moved to are calculated.
- the rotary table 13 is rotated by the calculated rotation angle and the XY drive amount, and the XY table 21 is moved in the X and Y directions.
- the notch 11b of the wafer 11 moves to a predetermined position (X3, Y3) near the objective lens of the microscope 31, and the microscopic inspection of the notch 11b by the microscope 31 is performed.
- the pre-alignment unit 37 performs briar alignment, which is a rough alignment of the wafer 11, when the discrimination unit 33 determines that the notch 11b of the wafer 11 does not exist.
- the bri-alignment unit 37 positions the wafer 11 at a predetermined position of the wafer inspection apparatus using the coordinates of the reference notch 11a of the wafer 11 detected by the position detection unit 35.
- the coordinates of the reference notch 11a of the wafer 11 detected by the position detection unit 35 are as shown in FIG. 7 when the wafer 11 is rotated 360 degrees in the direction E from the state of FIG. , (XI, Y1, ⁇ 1).
- the predetermined position where the reference notch 11a of the wafer 11 should be located is, for example, (X5, Y5) with respect to the origin in the coordinate system of the XY table 21, as shown in FIG. .
- the pre-alignment unit 37 sets the reference notch 11a of the wafer 11 at the current position (X1, Y1, ⁇ 1) to (X5, Y5 ) Calculate the rotation angle of the rotary table 13 and the XY drive amount of the XY table 21 that can be moved to the position (1).
- the rotary table 13 is rotated by the calculated rotation angle and the XY drive amount, and the XY table 21 is moved in the X and Y directions.
- the reference notch 11a of the wafer 11 moves to (X5, Y5), which is the alignment position. Then, it is moved to the next step from this position by a transport device (not shown).
- the bri-alignment unit 37 determines the rotation center of the wafer 11 from the shape of the outer peripheral edge of the wafer 11 detected by the position detection unit 35, as shown in FIG. It has a function of performing pre-alignment while correcting the deviation between the rotation center of the wafer 11 and the center of the rotation axis. Using this function enables more accurate pre-alignment.
- the wafer inspection apparatus In the above-described wafer inspection apparatus, light is projected on the outer peripheral edge of the wafer 11 placed on the rotary table 13, and the light projected on the outer peripheral edge of the wafer 11 is detected by the detector 29. Since the reference notch 11a of the wafer 11 and the notch 11b other than the reference notch 11a are determined from the detection signal S1 of the detection unit 29, the wafer 11 The chipped portion 1 1b of the outer peripheral edge portion can be detected quickly and reliably. Therefore, in the processing step of the semiconductor process, for example, it is possible to prevent the wafer 11 from being broken by heat treatment such as baking (prevention of breakage caused by the chipped portion 11b).
- the detection signal S1 is differentiated, and the reference notch 11a and the notch 11b are determined based on the differential value. It is possible to determine the portion 11a and the missing portion 11b.
- the notch lib of the wafer 11 was moved to a predetermined position near the microscope 31 using the coordinates of the notch 1 lb of the wafer 11 detected by the position detection unit 35, so that Micro inspection can be performed easily and reliably.
- the pre-alignment of the wafer 11 is performed by the pre-alignment unit 37 when there is no chipped portion 1 b in the wafer 11 placed on the turntable 13. Therefore, the preparation of the wafer 11 can be performed easily and reliably.
- the reference notch 11 a and the reference notch 11 a of the wafer 11 are determined based on the value of the differential signal of the notch 11 b of the wafer 11 (ie, the shape of the notch 11 b).
- the notch 1 1b other than the notch 1 1a is determined
- the present invention is not limited to such an embodiment, and the quality of the wafer 11 can be determined from the relative position of the reference notch 11 a and the notch 11 b of the wafer 11. That is, in general, the wafer 11 has a crystal structure, and even if the wafer 11 has a chip P 1 1b, the chip 11 1b may not be formed depending on the relative positional relationship with the reference notch 11a. There are locations where blasting does not occur.
- the position detecting unit 35 detects the coordinates of the reference notch 11 a of the wafer 11 placed on the turntable 13 and the coordinates of the notch lib, and the discriminating unit 33 detects the notch. It is possible to determine whether the wafer 11 is good or not by determining whether or not the coordinate position of 1 1b exists in the range of an angle 07 to ⁇ 8 with respect to the reference notch 11a of the wafer 11. It becomes possible.
- the present invention is not limited to this embodiment.
- the orientation flat formed in 1 may be used as the reference notch 11a.
- the light projecting system 23 is disposed above the outer periphery of the wafer 11, and the light emitted from the outer periphery of the wafer 11 is detected by the detecting unit 2 disposed below the outer periphery of the wafer 11.
- the present invention is not limited to such an embodiment.
- the detection unit 29 may detect light reflected on the outer periphery of the wafer 11 by the detection unit 29. good.
- the inspection light from the light projecting means is emitted to the outer peripheral edge of the semiconductor wafer mounted on the rotary table, and the inspection light emitted to the outer peripheral edge is detected by the detecting means. You. Then, the defect of the outer peripheral edge portion of the semiconductor wafer is determined from the detection signal of the detecting means by the determining means. This makes it possible to quickly and reliably detect a defect at the outer edge portion of the semiconductor wafer.
- the discriminating means discriminates the reference notch of the semiconductor wafer and the notch other than the reference notch from the detection signal of the detecting means. As a result, even if the reference notch exists, the notch at the outer peripheral edge of the semiconductor wafer can be quickly and reliably detected.
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- General Health & Medical Sciences (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Testing Or Measuring Of Semiconductors Or The Like (AREA)
- Investigating Materials By The Use Of Optical Means Adapted For Particular Applications (AREA)
- Container, Conveyance, Adherence, Positioning, Of Wafer (AREA)
Abstract
Description
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Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
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JP2003-030579 | 2003-02-07 | ||
JP2003030579 | 2003-02-07 |
Publications (1)
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WO2004070370A1 true WO2004070370A1 (ja) | 2004-08-19 |
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Application Number | Title | Priority Date | Filing Date |
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PCT/JP2004/001264 WO2004070370A1 (ja) | 2003-02-07 | 2004-02-06 | ウエハ検査装置 |
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TW (1) | TW200416390A (ja) |
WO (1) | WO2004070370A1 (ja) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN113523591A (zh) * | 2021-06-25 | 2021-10-22 | 大族激光科技产业集团股份有限公司 | 一种可变载台及激光切割设备 |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
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JP6380582B1 (ja) * | 2017-03-08 | 2018-08-29 | 株式会社Sumco | エピタキシャルウェーハの裏面検査方法、エピタキシャルウェーハ裏面検査装置、エピタキシャル成長装置のリフトピン管理方法およびエピタキシャルウェーハの製造方法 |
CN110823915B (zh) * | 2018-08-08 | 2021-02-19 | 合肥晶合集成电路股份有限公司 | 一种晶元破片分析装置及其晶元破片分析方法 |
CN114324365B (zh) * | 2022-01-10 | 2023-06-23 | 合肥御微半导体技术有限公司 | 一种曲面检测装置 |
Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS57161642A (en) * | 1981-03-31 | 1982-10-05 | Olympus Optical Co Ltd | Inspecting device for defect of surface |
JPH04177851A (ja) * | 1990-11-13 | 1992-06-25 | Nec Kyushu Ltd | ウェーハ外観検査装置 |
JPH05187830A (ja) * | 1992-01-13 | 1993-07-27 | Nikon Corp | 円形基板の外形測定装置 |
JPH06160063A (ja) * | 1992-11-19 | 1994-06-07 | Sumitomo Metal Ind Ltd | 表面検査方法 |
JPH11326229A (ja) * | 1998-05-21 | 1999-11-26 | Hitachi Electron Eng Co Ltd | 異物検査装置 |
-
2004
- 2004-02-06 TW TW93102711A patent/TW200416390A/zh not_active IP Right Cessation
- 2004-02-06 WO PCT/JP2004/001264 patent/WO2004070370A1/ja not_active Application Discontinuation
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS57161642A (en) * | 1981-03-31 | 1982-10-05 | Olympus Optical Co Ltd | Inspecting device for defect of surface |
JPH04177851A (ja) * | 1990-11-13 | 1992-06-25 | Nec Kyushu Ltd | ウェーハ外観検査装置 |
JPH05187830A (ja) * | 1992-01-13 | 1993-07-27 | Nikon Corp | 円形基板の外形測定装置 |
JPH06160063A (ja) * | 1992-11-19 | 1994-06-07 | Sumitomo Metal Ind Ltd | 表面検査方法 |
JPH11326229A (ja) * | 1998-05-21 | 1999-11-26 | Hitachi Electron Eng Co Ltd | 異物検査装置 |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN113523591A (zh) * | 2021-06-25 | 2021-10-22 | 大族激光科技产业集团股份有限公司 | 一种可变载台及激光切割设备 |
Also Published As
Publication number | Publication date |
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TWI315398B (ja) | 2009-10-01 |
TW200416390A (en) | 2004-09-01 |
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