TWI766091B - Wafer processing method - Google Patents

Wafer processing method Download PDF

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TWI766091B
TWI766091B TW107131245A TW107131245A TWI766091B TW I766091 B TWI766091 B TW I766091B TW 107131245 A TW107131245 A TW 107131245A TW 107131245 A TW107131245 A TW 107131245A TW I766091 B TWI766091 B TW I766091B
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wafer
sealing material
cutting groove
sealing
processing
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TW107131245A
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TW201913777A (en
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鈴木克彦
伴祐人
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日商迪思科股份有限公司
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    • H—ELECTRICITY
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    • H01L21/67005—Apparatus not specifically provided for elsewhere
    • H01L21/67011—Apparatus for manufacture or treatment
    • H01L21/67092—Apparatus for mechanical treatment
    • B—PERFORMING OPERATIONS; TRANSPORTING
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    • 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
    • B23K26/03—Observing, e.g. monitoring, the workpiece
    • B23K26/032—Observing, e.g. monitoring, the workpiece using optical means
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    • B23K26/00—Working by laser beam, e.g. welding, cutting or boring
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    • B23K26/00—Working by laser beam, e.g. welding, cutting or boring
    • B23K26/36—Removing material
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    • B23K26/60—Preliminary treatment
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    • H01L21/50—Assembly of semiconductor devices using processes or apparatus not provided for in a single one of the subgroups H01L21/06 - H01L21/326, e.g. sealing of a cap to a base of a container
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    • 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
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    • H01L23/31—Encapsulations, e.g. encapsulating layers, coatings, e.g. for protection characterised by the arrangement or shape
    • H01L23/3107—Encapsulations, e.g. encapsulating layers, coatings, e.g. for protection characterised by the arrangement or shape the device being completely enclosed
    • H01L23/3114—Encapsulations, e.g. encapsulating layers, coatings, e.g. for protection characterised by the arrangement or shape the device being completely enclosed the device being a chip scale package, e.g. CSP
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    • B23K2101/00—Articles made by soldering, welding or cutting
    • B23K2101/36—Electric or electronic devices
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    • B23K2103/00—Materials to be soldered, welded or cut
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    • B23K2103/50—Inorganic material, e.g. metals, not provided for in B23K2103/02 – B23K2103/26
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  • Container, Conveyance, Adherence, Positioning, Of Wafer (AREA)

Abstract

本發明係一種晶圓之加工方法，其課題為提供：通過含有被覆於晶圓表面之碳黑的封閉材而可實施校準工程之晶圓之加工方法者。 　　解決手段係於經由交叉所形成之複數的分割預定線所區劃之表面的各範圍，形成具有各複數的突起電極之裝置的晶圓之加工方法，其特徵為具備：自該晶圓的表面側，沿著該分割預定線，經由切削刀片而形成相當於裝置晶片之完成厚度之深度的切削溝的切削溝形成工程，和實施該切削溝形成工程之後，以封閉材而封閉包含該切削溝之該晶圓的表面之封閉工程，和實施該封閉工程之後，自該晶圓的表面側，經由可視光攝影手段，透過封閉材而查出對準標記，依據該對準標記而查出欲雷射加工之該分割預定線的校準工程，和實施該校準工程之後，自該晶圓之表面側，沿著該分割預定線，照射對於該封閉材而言，具有吸收性之波長的雷射束，經由剝蝕加工而於該切削溝中之該封閉材，形成相當於裝置晶片之完成厚度之深度的雷射加工溝之雷射加工溝形成工程，和實施該雷射加工溝形成工程之後，於該晶圓的表面，貼著保護構件之保護構件貼著工程，和實施該保護構件貼著工程之後，自該晶圓的背面側至該裝置晶片之完成厚度為止研削該晶圓而使該雷射加工溝露出，分割成經由該封閉材而圍繞有表面及4側面之各個的裝置晶片之分割工程；該校準工程係於經由該可視光攝影手段而攝影之範圍，經由斜光手段而自傾斜照射光之同時而實施者。The present invention relates to a method for processing wafers, and its object is to provide a method for processing wafers that can perform alignment processes by using a sealing material containing carbon black coated on the surface of the wafers. The means for solving the problem is a wafer processing method for forming a device having a plurality of protruding electrodes in each area of the surface defined by a plurality of predetermined dividing lines formed by intersecting, comprising: from the surface side of the wafer a cutting groove forming process of forming a cutting groove with a depth corresponding to the complete thickness of the device wafer along the dividing line along the cutting blade, and after carrying out the cutting groove forming process, sealing the area including the cutting groove with a sealing material The sealing process of the surface of the wafer, and after the sealing process is carried out, from the surface side of the wafer, through a visible light photographing method, an alignment mark is detected through a sealing material, and an intended strike is detected according to the alignment mark. The alignment process of the planned dividing line in the laser processing, and after the alignment process is performed, from the surface side of the wafer, along the planned dividing line, the sealing material is irradiated with a laser beam of a wavelength having an absorptive wavelength , the sealing material in the cutting groove is formed by ablation processing to form a laser processing groove with a depth corresponding to the completed thickness of the device wafer. After the laser processing groove forming process is carried out, in The surface of the wafer is adhered to the protective member sticking process of the protective member, and after the protective member sticking process is carried out, the wafer is ground from the back side of the wafer to the complete thickness of the device chip to make the laser light. The radiation processing groove is exposed, and it is divided into the separation process of each device wafer surrounded by the surface and 4 sides through the sealing material; the calibration process is in the range of photography by the visible light photography means, and is irradiated from an oblique light by oblique light means. The implementer at the same time of the light.

Description

晶圓之加工方法Wafer processing method

本發明係有關加工晶圓而形成5S模製封裝的晶圓之加工方法。The present invention relates to a processing method for processing wafers to form 5S molding package wafers.

作為實現LSI或NAND型快閃記憶體等之各種裝置的小型化及高密度安裝化之構造，例如將以晶片尺寸而封裝化裝置晶片之晶片尺寸封裝(CSP)提供於實用，廣泛使用於行動電話或智慧型手機等。更且，近年係在此CSP之中，開發有不僅晶片的表面而將全側面，以封閉材進行封閉之CSP，所謂5S模製封裝而加以實用化。As a structure for realizing miniaturization and high-density mounting of various devices such as LSI and NAND type flash memory, for example, a chip size package (CSP) in which a device chip is packaged in a chip size is provided for practical use, and is widely used in mobile phone or smartphone, etc. In addition, among these CSPs, in recent years, not only the surface of the chip but also the entire side surface of the chip is closed with a sealing material, a so-called 5S mold package has been developed and put into practical use.

以往的5S模製封裝係經由以下的工程而加以製作。 　　(1) 於半導體晶圓(以下，有略稱為晶圓之情況)之表面，形成稱為裝置(電路)及突起電極之外部連接端子。 　　(2) 自晶圓的表面側，沿著分割預定線而切削晶圓，形成相當於裝置晶片的完成厚度之深度的切削溝。 　　(3) 以摻入碳黑之封閉材而封閉晶圓的表面。 　　(4) 將晶圓的背面側，研削至裝置晶片的完成厚度而使切削溝中之封閉材露出。 　　(5) 晶圓表面係因以摻入碳黑之封閉材而加以封閉之故，除去晶圓表面的外周部分之封閉材而使標靶圖案等之對準標記露出，依據此對準標記而實施查出欲切削之分割預定線的校準。 　　(6) 依據校準，自晶圓的表面側，沿著分割預定線而切削晶圓，分割成以封閉材而封閉表面及全側面之5S模製封裝。The conventional 5S mold package is produced through the following processes. (1) External connection terminals called devices (circuits) and bump electrodes are formed on the surface of a semiconductor wafer (hereinafter, abbreviated as wafer). (2) From the front side of the wafer, the wafer is cut along the line to be divided to form a cut groove with a depth corresponding to the completed thickness of the device wafer. (3) Seal the surface of the wafer with a sealing material doped with carbon black. (4) Grind the back side of the wafer to the complete thickness of the device wafer to expose the sealing material in the cutting groove. (5) Since the wafer surface is sealed with a sealing material doped with carbon black, the sealing material of the outer peripheral portion of the wafer surface is removed to expose the alignment marks such as the target pattern. A calibration is performed to detect the dividing line to be cut. (6) According to the calibration, the wafer is cut from the surface side of the wafer along the dividing line, and divided into 5S molding packages with the surface and the whole side closed by the sealing material.

如上述，晶圓的表面係以包含碳黑之封閉材而加以封閉之故，形成於晶圓表面的裝置等係完全無法以肉眼看見。為了解決此問題而可進行校準，而如在上述(5)所記載地，本申請人係開發除去晶圓表面的封閉材之外周部分而使標靶圖案等之對準標記露出，依據此對準標記而查出欲切削之分割預定線，執行校準的技術(參照日本特開2013-074021號公報及日本特開2016-015438號公報)。 [先前技術文獻] [專利文獻]As described above, since the surface of the wafer is sealed with the sealing material containing carbon black, devices and the like formed on the surface of the wafer are completely invisible to the naked eye. In order to solve this problem, alignment can be performed, and as described in (5) above, the present applicant developed to remove the outer peripheral portion of the sealing material on the wafer surface to expose the alignment marks such as the target pattern. A technique in which a planned dividing line to be cut is detected by aligning the marks, and calibration is performed (refer to Japanese Patent Laid-Open No. 2013-074021 and Japanese Patent Laid-Open No. 2016-015438). [Prior Art Literature] [Patent Literature]

[專利文獻1] 日本特開2013-074021號公報 　　[專利文獻2] 日本特開2016-015438號公報[Patent Document 1] Japanese Patent Application Laid-Open No. 2013-074021 [Patent Document 2] Japanese Patent Application Laid-Open No. 2016-015438

[發明欲解決之課題][The problem to be solved by the invention]

但在記載於上述公開公報之校準方法中，取代於切割用之切削刀片，而將磨邊修整用之寬度廣的切削刀片安裝於心軸，除去晶圓的外周部分之封閉材之工程則必要，而經由切削刀片的交換及磨邊修整，除去外周部分之封閉材的工時則耗費，有著生產性差的問題。However, in the calibration method described in the above-mentioned publication, instead of the cutting insert for dicing, a cutting insert with a wide width for edging is attached to the mandrel, and the process of removing the sealing material of the outer peripheral portion of the wafer is necessary. However, the man-hours for removing the sealing material of the outer peripheral portion through the exchange of the cutting inserts and the edging are long, and there is a problem that the productivity is poor.

本發明係有鑑於如此的點所作為的構成，而其目的係提供：通過包含被覆於晶圓表面的碳黑之封閉材而可實施校準工程之晶圓的加工方法者。 [為了解決課題之手段]The present invention is constituted in view of such a point, and an object thereof is to provide a wafer processing method capable of performing an alignment process by a sealing material including carbon black coated on the wafer surface. [In order to solve the problem]

根據本發明時，提供：於經由交叉所形成之複數的分割預定線所區劃之表面的各範圍，形成具有各複數的突起電極之裝置的晶圓之加工方法，其特徵為具備：自該晶圓的表面側，沿著該分割預定線，經由切削刀片而形成相當於裝置晶片之完成厚度之深度的切削溝的切削溝形成工程，和實施該切削溝形成工程之後，以封閉材而封閉包含該切削溝之該晶圓的表面之封閉工程，和實施該封閉工程之後，自該晶圓的表面側，經由可視光攝影手段，透過封閉材而查出對準標記，依據該對準標記而查出欲雷射加工之該分割預定線的校準工程，和實施該校準工程之後，自該晶圓之表面側，沿著該分割預定線，照射對於該封閉材而言，具有吸收性之波長的雷射束，經由剝蝕加工而於該切削溝中之該封閉材，形成相當於裝置晶片之完成厚度之深度的雷射加工溝之雷射加工溝形成工程，和實施該雷射加工溝形成工程之後，於該晶圓的表面，貼著保護構件之保護構件貼著工程，和實施該保護構件貼著工程之後，自該晶圓的背面側至該裝置晶片之完成厚度為止研削該晶圓而使該雷射加工溝露出，分割成經由該封閉材而圍繞有表面及4側面之各個的裝置晶片之分割工程；該校準工程係於經由該可視光攝影手段而攝影之範圍，經由斜光手段而自傾斜照射光之同時而實施之晶圓的加工方法。 [發明效果]According to the present invention, there is provided a wafer processing method for forming a device having a plurality of protruding electrodes in each area of a surface defined by a plurality of predetermined dividing lines formed by crossing, characterized by comprising: from the wafer On the surface side of the circle, along the planned dividing line, a cutting groove forming process of forming a cutting groove corresponding to the depth of the complete thickness of the device wafer through the cutting blade, and after the cutting groove forming process is carried out, it is sealed with a sealing material. The sealing process of the surface of the wafer in the cutting groove, and after the sealing process is performed, from the surface side of the wafer, an alignment mark is detected through the sealing material by a visible light imaging method, and the alignment mark is based on the alignment mark. The alignment process for detecting the planned dividing line to be laser-processed, and after performing the alignment process, from the surface side of the wafer, along the planned dividing line, the sealing material is irradiated with a wavelength that is absorptive to the sealing material A laser beam forming process of forming a laser processing groove corresponding to the depth of the completed thickness of the device wafer on the sealing material in the cutting groove through ablation processing, and carrying out the laser processing groove formation After the process, on the surface of the wafer, the protective member attaching process of the protective member is attached, and after the protective member attaching process is performed, the wafer is ground from the back side of the wafer to the complete thickness of the device chip The laser processing groove is exposed and divided into device wafers surrounded by the surface and 4 side faces through the sealing material; the calibration process is in the range of photography by the visible light photography means, through the oblique light means. A method of processing wafers while irradiating light from an oblique angle. [Inventive effect]

當根據本發明之晶圓的加工方法時，因作為呈以斜光手段而自傾斜照射光之同時，經由可視光攝影手段而透過封閉材，查出形成於晶圓之對準標記，再依據對準標記而可實施校準之故，無須如以往，除去晶圓表面之外周部分的封閉材之情況，而可簡單地實施校準工程。According to the wafer processing method of the present invention, since the light is irradiated obliquely by the oblique light method, the sealing material is transmitted through the visible light photographing method, and the alignment marks formed on the wafer are detected, and then the alignment marks formed on the wafer are detected according to the alignment mark. Since calibration can be carried out by using the standard marks, it is not necessary to remove the sealing material of the outer peripheral portion of the wafer surface as in the past, and the calibration process can be simply carried out.

因而，自晶圓之表面側，沿著充填於形成在相當於裝置晶片之完成厚度之深度的切削溝內之封閉材，經由剝蝕加工而可形成雷射加工溝者，之後，經由自晶圓的背面側至該裝置晶片之完成厚度為止研削晶圓而使該雷射加工溝露出之時，分割成經由封閉材而封閉有表面及4側面之各個的裝置晶片者。Therefore, from the surface side of the wafer, along the sealing material filled in the cutting groove formed in the depth corresponding to the completed thickness of the device chip, the laser processing groove can be formed by the ablation process, and then the laser processing groove can be formed from the wafer. When the back surface side of the device chip is ground to the complete thickness of the device chip to expose the laser processing groove, it is divided into device chips having each of the front surface and the four side surfaces closed by a sealing material.

以下，參照圖面而加以詳細說明本發明之實施形態。當參照圖1時，顯示適合於以本發明之加工方法而加工之半導體晶圓(以下，有單略稱為晶圓之情況)11之表面側斜視圖。Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. Referring to FIG. 1, there is shown a front side perspective view of a semiconductor wafer (hereinafter, abbreviated as wafer) 11 suitable for processing by the processing method of the present invention.

在半導體晶圓11之表面11a中，將複數之分割預定線(切割道)13形成為格子狀，而對於經由正交之分割預定線13所區劃之各範圍，係形成有IC、LSI等之裝置15。On the surface 11a of the semiconductor wafer 11, a plurality of planned dividing lines (dicing lines) 13 are formed in a lattice shape, and ICs, LSIs, etc. are formed in each area defined by the orthogonal dividing planned lines 13. device 15.

對於各裝置15之表面係具有複數的電極凸塊(以下，有單略稱為突起電極之情況)17，而晶圓11係於其表面具備形成有備有各複數之突起電極17之複數的裝置15之裝置範圍19，和圍繞裝置範圍19之外周剩餘範圍21。The surface of each device 15 has a plurality of electrode bumps (hereinafter, abbreviated as bump electrodes in some cases) 17, and the wafer 11 has a plurality of bump electrodes 17 formed on its surface with a plurality of bump electrodes 17. Device range 19 of device 15 , and remaining range 21 around the outer perimeter of device range 19 .

在本發明實施形態之晶圓的加工方法中，首先，作為第1工程，實施自晶圓11之表面側，沿著分割預定線13，經由切削刀片而形成相當於裝置晶片之完成厚度之深度的切削溝之切削溝形成工程。參照圖2而說明此切削溝形成工程。In the wafer processing method according to the embodiment of the present invention, first, as a first step, the surface side of the wafer 11 is carried out along the dividing line 13 to form a depth corresponding to the finished thickness of the device wafer through a cutting blade. The cutting groove forming process of the cutting groove. This cutting groove forming process will be described with reference to FIG. 2 .

切削單元10係具備：可拆裝於心軸12之前端部地加以安裝之切削刀片14，和具有可視光攝影手段(可視光攝影單元)18之校準單元16。可視光攝影單元18係具有以可視光攝影之顯微鏡及攝影機。The cutting unit 10 includes a cutting insert 14 that is detachably attached to the front end of the mandrel 12 , and a calibration unit 16 having a visible light photographing means (visible light photographing unit) 18 . The visible light photographing unit 18 has a microscope and a camera for photographing with visible light.

在實施切削溝形成工程之前，首先由可視光攝影單元18，以可視光而攝影晶圓11之表面，查出形成於各裝置15之標靶圖案等之對準標記，實施依據此對準標記而查出欲切削之分割預定線13的校準。Before the cutting groove forming process is performed, the surface of the wafer 11 is photographed with visible light by the visible light imaging unit 18, alignment marks such as target patterns formed in each device 15 are detected, and the alignment marks are performed according to the alignment marks. Then, the alignment of the planned dividing line 13 to be cut is detected.

校準實施後，使高速旋轉於箭頭R1方向之切削刀片14，自晶圓11的表面11a側，沿著分割預定線13而切入至相當於裝置晶片之完成厚度之深度，經由將吸引保持晶圓11之未圖示之夾盤加工傳送至箭頭X1方向之時，實施沿著分割預定線13而形成切削溝23之切削溝形成工程。After the calibration is performed, the cutting insert 14 rotating at high speed in the direction of the arrow R1 is cut from the surface 11a side of the wafer 11 along the line 13 to be divided to a depth corresponding to the completed thickness of the device wafer, and the wafer is held by suction. When the chucking process (not shown) of 11 is transferred to the direction of arrow X1, a cutting groove forming process for forming cutting grooves 23 along the dividing line 13 is performed.

將此切削溝形成工程，各分割預定線13之間距算出傳送切削單元10於與加工傳送方向X1正交之方向的同時，沿著伸長於第1方向之分割預定線13而依序實施。This cutting groove forming process is performed sequentially along the planned dividing line 13 extending in the first direction while calculating the distance between each planned dividing line 13 and conveying the cutting unit 10 in a direction orthogonal to the machining conveying direction X1.

接著，90°旋轉未圖示之夾盤之後，沿著伸長於正交於第1方向之第2方向的分割預定線13，依序實施同樣之切削溝形成工程。Next, after rotating the chuck (not shown) by 90°, the same cutting groove forming process is sequentially carried out along the planned dividing line 13 extending in the second direction perpendicular to the first direction.

實施切削溝形成工程之後，如圖3所示，塗佈封閉材20於晶圓11之表面11a，實施以封閉材而封閉包含切削溝23之晶圓11的表面11a之封閉工程。封閉材20係有流動性之故，當實施封閉工程時，於切削溝23中，填充有封閉材20。After the cutting groove forming process is performed, as shown in FIG. 3 , a sealing material 20 is applied on the surface 11 a of the wafer 11 , and a sealing process of sealing the surface 11 a of the wafer 11 including the cutting groove 23 with the sealing material is performed. Since the sealing material 20 has fluidity, when the sealing process is performed, the cutting groove 23 is filled with the sealing material 20 .

作為封閉材20係作成以質量%，包含環氧樹脂或環氧樹脂+苯酚樹脂10.3%、二氧化矽填充料85.3%、碳黑0.1~0.2%、其他成分4.2~4.3%之組成。作為其他的成分係例如，包含金屬氫氧化物，三氧化二銻，二氧化矽等。As the sealing material 20, it is made into the composition which contains 10.3% of epoxy resin or epoxy resin + phenol resin, 85.3% of silica filler, 0.1-0.2% of carbon black, and 4.2-4.3% of other components by mass %. As other components, for example, metal hydroxide, antimony trioxide, silicon dioxide, etc. are contained.

由如此組成之封閉材20而被覆晶圓11的表面11a，封閉晶圓11的表面11a時，經由極少量含於封閉材20中之碳黑而封閉材20成為黑色之故，通過封閉材20而看到晶圓11的表面11a之情況係通常為困難。The surface 11a of the wafer 11 is covered with the sealing material 20 composed in this way, and when the surface 11a of the wafer 11 is sealed, the sealing material 20 becomes black through the carbon black contained in the sealing material 20 in a very small amount, and the sealing material 20 passes through the sealing material 20. It is generally difficult to see the surface 11a of the wafer 11 .

在此，使碳黑混入於封閉材20中之情況係主要為了防止裝置15之靜電破壞，而目前未有市售未含有碳黑之封閉材。Here, the case where the carbon black is mixed into the sealing material 20 is mainly to prevent the electrostatic breakdown of the device 15, and there is no sealing material that does not contain carbon black on the market at present.

封閉材20之塗佈方法係未特別加以限定，但塗佈封閉材20至突起電極17之高度為止者為佳，接著，經由蝕刻而蝕刻封閉材20，進行突起電極17之露出。The coating method of the sealing material 20 is not particularly limited, but the sealing material 20 is preferably applied to the height of the protruding electrodes 17 , and then the sealing material 20 is etched by etching to expose the protruding electrodes 17 .

實施封閉工程之後，自晶圓11的表面11a側，經由可視光攝影手段而通過封閉材20，攝影晶圓11的表面11a，查出形成於晶圓11之表面11a的至少2個之標靶圖案等之對準標記，實施依據此等之對準標記而查出欲雷射加工之分割預定線13之校準工程。After the sealing process is performed, from the surface 11a side of the wafer 11, the surface 11a of the wafer 11 is photographed through the sealing material 20 by means of visible light imaging, and at least two targets formed on the surface 11a of the wafer 11 are detected. Alignment marks such as patterns are subjected to a calibration process of finding out the planned dividing line 13 to be laser-processed based on these alignment marks.

對於此校準工程，參照圖4而詳細說明。在實施校準工程之前，在晶圓11的背面11b側，貼著於裝設外周部於環狀框體F之切割膠帶T。This calibration process will be described in detail with reference to FIG. 4 . Before performing the alignment process, the dicing tape T attached to the outer peripheral portion of the ring-shaped frame body F is attached to the back surface 11 b side of the wafer 11 .

在校準工程中，如圖4所示，藉由切割膠帶T，以雷射加工裝置之夾盤40而吸引保持晶圓11，使封閉晶圓11的表面11a之封閉材20露出於上方。並且，以夾鉗42而夾鉗固定環狀框體F。In the calibration process, as shown in FIG. 4 , the wafer 11 is attracted and held by the chuck 40 of the laser processing apparatus by the dicing tape T, so that the sealing material 20 sealing the surface 11 a of the wafer 11 is exposed above. Then, the ring-shaped frame body F is clamped by clamps 42 .

在校準工程中，以與切削裝置之可視光攝影單元18同樣之雷射加工裝置的可視光攝影單元18A之CCD等之攝影元件，而攝影晶圓11之表面11a。但，對於封閉材20中係含有二氧化矽填充料，碳黑等之成分，而更且對於封閉材20之表面係有凹凸之故，在可視光攝影單元18A之垂直照明中，即使透過封閉材20而攝影晶圓11的表面11a，攝影畫像亦成為散焦，而查出標靶圖案等之對準標記之情況則為困難。In the calibration process, the surface 11a of the wafer 11 is photographed with a photographing element such as a CCD of the visible light photographing unit 18A of the laser processing apparatus, which is the same as the visible light photographing unit 18 of the cutting apparatus. However, since the sealing material 20 contains silica filler, carbon black, etc., and the surface of the sealing material 20 is uneven, in the vertical illumination of the visible light photographing unit 18A, even if the sealing material 20 passes through the sealing material When the surface 11a of the imaging wafer 11 is removed from the material 20, the imaging image is also out of focus, and it is difficult to detect alignment marks such as target patterns.

因此，在本實施形態之校準工程中，加上於可視光攝影單元18A之垂直照明而自斜光手段31，從傾斜照射光於攝影範圍，改善攝影畫像之散焦，作為可查出對準標記。Therefore, in the calibration process of the present embodiment, the vertical illumination of the visible light photographing unit 18A is added, and the oblique light means 31 irradiates light from the oblique light to the photographing range to improve the defocus of the photographed image as an alignment mark that can be detected. .

自斜光手段31照射的光係白色光為佳，而對於晶圓11的表面11a之入射角係30°~60°之範圍內為佳。理想係可視光攝影單元18A係具備可調整曝光時間等之曝光部。The light irradiated from the oblique light means 31 is preferably white light, and the incident angle to the surface 11 a of the wafer 11 is preferably in the range of 30°˜60°. Ideally, the visible light imaging unit 18A is provided with an exposure section capable of adjusting the exposure time and the like.

接著，連結此等之對準標記的直線則呈與加工傳送方向平行地，θ旋轉夾盤40，更且經由僅對準標記與分割預定線13之中心的距離，將圖2所示之切削單元10移動於與加工傳送方向X1正交之方向之時，查出欲切削之分割預定線13。Then, the straight line connecting these alignment marks is parallel to the processing and conveying direction, the chuck 40 is rotated by θ, and the cutting shown in FIG. 2 is cut only by the distance between the alignment marks and the center of the dividing line 13 When the unit 10 moves in the direction orthogonal to the processing conveyance direction X1, the planned dividing line 13 to be cut is detected.

實施校準工程之後，如圖5(A)所示，自晶圓11的表面11a側沿著分割預定線13，自雷射加工裝置之雷射頭(集光器)46照射對於封閉材20而言具有吸收性之波長(例如，355nm)之雷射束LB，實施經由剝蝕加工，形成如圖5(B)所示之雷射加工溝25於充填於切削溝23中之封閉材20中的雷射加工溝形成工程。After the alignment process is performed, as shown in FIG. 5(A) , the sealing material 20 is irradiated from the laser head (concentrator) 46 of the laser processing apparatus along the planned dividing line 13 from the surface 11 a side of the wafer 11 to the sealing material 20 . The laser beam LB with an absorbing wavelength (for example, 355 nm) is subjected to ablation processing to form a laser processing groove 25 as shown in FIG. 5(B) in the sealing material 20 filled in the cutting groove 23. Laser processing groove formation project.

將此雷射加工溝形成工程，沿著伸長於第1方向之分割預定線13而依序實施之後，90°旋轉夾盤40，沿著伸長於正交於第1方向之第2方向的分割預定線13而依序實施。After this laser processing groove forming process is sequentially performed along the planned dividing line 13 extending in the first direction, the chuck 40 is rotated 90° to divide along the second direction extending perpendicular to the first direction. The predetermined line 13 is executed sequentially.

實施雷射加工溝形成工程之後，自晶圓11之背面11b側至裝置晶片的完成厚度為止，研削晶圓11，使形成於封閉材20中之雷射加工溝25露出，實施將晶圓11分割成各個之裝置晶片27之分割工程。After the laser processing groove forming process is performed, the wafer 11 is ground from the back surface 11b side of the wafer 11 to the complete thickness of the device chip, and the laser processing groove 25 formed in the sealing material 20 is exposed, and the wafer 11 is subjected to The division process of the device wafer 27 divided into each.

參照圖6而說明此分割工程。於實施分割工程之前，實施貼著表面保護膠帶等之保護構件22於晶圓11的表面11a之保護構件貼著工程。並且，藉由保護構件22，以研削裝置之夾盤24而吸引保持晶圓11。This division process will be described with reference to FIG. 6 . Before carrying out the division process, the protective member sticking process of sticking the protective member 22, such as a surface protection tape, to the surface 11a of the wafer 11 is carried out. Then, the wafer 11 is sucked and held by the chuck 24 of the grinding apparatus by the protective member 22 .

研削單元26係包含：經由可旋轉於主軸套28中地加以收容而未圖示之馬達，進行旋轉驅動之心軸30，和固定於心軸30之前端的盤座32，和可拆裝於盤座32地加以裝設之研削砂輪34。研削砂輪34係由環狀之轉輪基台36，和固定安裝於轉輪基台36之下端外周之複數的研磨石38而加以構成。The grinding unit 26 includes: a motor rotatably accommodated in the main shaft sleeve 28 but not shown, a mandrel 30 for rotational driving, a disc base 32 fixed to the front end of the mandrel 30, and a disc detachable and detachable from the disc. A grinding wheel 34 is installed on the seat 32 . The grinding wheel 34 is composed of a ring-shaped wheel base 36 and a plurality of grinding stones 38 fixedly mounted on the outer periphery of the lower end of the wheel base 36 .

在分割工程中，將夾盤24，於以箭頭a所示之方向，例如以300rpm進行旋轉同時，使研削砂輪34，於以箭頭b所示之方向，例如以6000rpm進行旋轉同時，驅動未圖示之研削單元傳送機構，使研削砂輪34之研磨石38接觸於晶圓11之背面11b。In the dividing process, the chuck 24 is rotated in the direction indicated by the arrow a, for example, at 300 rpm, while the grinding wheel 34 is rotated in the direction indicated by the arrow b, for example, at 6000 rpm, and the drive is not shown. The shown grinding unit conveying mechanism makes the grinding stone 38 of the grinding wheel 34 contact the back surface 11 b of the wafer 11 .

並且，將研削砂輪34，以特定的研削傳送速度，於下方進行特定量研削傳送之同時，研削晶圓11之背面11b。以接觸式或非接觸式之厚度測定計而測定晶圓11的厚度同時，將晶圓11研削為特定的厚度，例如100μm，如圖6(B)所示，將晶圓11，分割成經由封閉材而封閉表面及4側面之各個之裝置晶片27。Then, the grinding wheel 34 grinds the back surface 11 b of the wafer 11 while carrying out a predetermined amount of grinding and conveying downward at a specific grinding conveying speed. The thickness of the wafer 11 is measured with a contact or non-contact thickness meter, and the wafer 11 is ground to a specific thickness, for example, 100 μm, as shown in FIG. 6(B), the wafer 11 is divided into The sealing material closes the device wafer 27 of each of the surface and 4 sides.

如此所製造之裝置晶片27係經由反轉裝置晶片27之表背而將突起電極17連接於母板的導電墊片之倒裝晶片接合，而可安裝於母板者。The device chip 27 thus produced is one that can be mounted on the motherboard by flip-chip bonding of the bump electrodes 17 to the conductive pads of the motherboard by inverting the front and back of the device chip 27 .

10‧‧‧切削單元11‧‧‧半導體晶圓13‧‧‧分割預定線14‧‧‧切削刀片15‧‧‧裝置16‧‧‧校準單元17‧‧‧電極凸塊18，18A‧‧‧攝影單元20‧‧‧封閉材23‧‧‧切削溝25‧‧‧雷射加工溝26‧‧‧研削單元27‧‧‧裝置晶片31‧‧‧斜光手段34‧‧‧研削砂輪38‧‧‧研磨石46‧‧‧雷射頭(集光器)10‧‧‧Cutting unit 11‧‧‧Semiconductor wafer 13‧‧‧Planning line for dividing 14‧‧‧Cutting insert 15‧‧‧Device 16‧‧‧Alignment unit 17‧‧‧Electrode bumps 18, 18A‧‧‧ Photography unit 20‧‧‧Closing material 23‧‧‧Cutting groove 25‧‧‧Laser processing groove 26‧‧‧Grinding unit 27‧‧‧Device wafer 31‧‧‧Oblique light means 34‧‧‧grinding wheel 38‧‧‧ Grinding stone46‧‧‧laser head (concentrator)

圖1係半導體晶圓之斜視圖。 　　圖2係顯示切削溝形成工程之斜視圖。 　　圖3係顯示封閉工程之斜視圖。 　　圖4係顯示校準工程之剖面圖。 　　圖5(A)係顯示雷射加工溝形成工程的一部分剖面側面圖，圖5(B)係雷射加工溝形成工程實施後之晶圓的一部分擴大剖面圖。 　　圖6(A)係顯示研削晶圓的背面而將晶圓分割為各個之裝置晶片之分割工程的一部分剖面側面圖，圖6(B)係經由封閉材而封閉表面及4側面之裝置晶片的擴大剖面圖。FIG. 1 is an oblique view of a semiconductor wafer. Fig. 2 is an oblique view showing the cutting groove forming process. Figure 3 is an oblique view showing the closure works. Figure 4 is a sectional view showing the calibration process. Fig. 5(A) is a cross-sectional side view showing a part of the laser processing groove forming process, and Fig. 5(B) is a part of the enlarged cross-sectional view of the wafer after the laser processing groove forming process is carried out. FIG. 6(A) is a partial cross-sectional side view showing a process of dividing the wafer into individual device chips by grinding the back surface of the wafer, and FIG. 6(B) is a side view of the device chip in which the front and four sides are closed by a sealing material. Enlarged sectional view.

11‧‧‧半導體晶圓 11‧‧‧Semiconductor Wafers

11a‧‧‧表面 11a‧‧‧Surface

18‧‧‧攝影單元 18‧‧‧Photography

20‧‧‧封閉材 20‧‧‧Closing material

31‧‧‧斜光手段 31‧‧‧Oblique light means

40‧‧‧夾盤 40‧‧‧Chuck

42‧‧‧夾鉗 42‧‧‧Clamp

F‧‧‧環狀框體 F‧‧‧Ring Frame

T‧‧‧切割膠帶 T‧‧‧Cutting Tape

Claims (1)

一種晶圓之加工方法，係於經由交叉而形成之複數的分割預定線所區劃之表面的各範圍，分別形成具有複數的突起電極之裝置的晶圓之加工方法，其特徵為具備：自該晶圓的表面側，沿著該分割預定線，經由切削刀片而形成相當於裝置晶片之完成厚度之深度的切削溝的切削溝形成工程，和實施該切削溝形成工程之後，以封閉材而封閉包含該切削溝之該晶圓的表面之封閉工程，和實施該封閉工程之後，不除去設於該晶圓之表面之外周部分之該封閉材，自該晶圓的表面側，經由可視光攝影手段，透過該封閉材而查出對準標記，依據該對準標記而查出應雷射加工之該分割預定線的校準工程，實施該校準工程之後，自該晶圓之表面側，沿著該分割預定線，照射對於該封閉材而言具有吸收性之波長的雷射束，經由剝蝕加工而於該切削溝中之該封閉材，形成相當於裝置晶片之完成厚度之深度的雷射加工溝之雷射加工溝形成工程，和實施該雷射加工溝形成工程之後，於該晶圓的表面，貼著保護構件之保護構件貼著工程，和實施該保護構件貼著工程之後，自該晶圓的背面側至該裝置晶片之完成厚度為止研削該晶圓而使該雷射加工溝露出，分割成經由該封閉材圍繞有表面及4側面之各個 的裝置晶片之分割工程；該校準工程係於經由該可視光攝影手段而攝影之範圍，經由斜光手段而自斜向照射光之同時而實施者。 A method for processing a wafer, wherein devices having a plurality of protruding electrodes are formed in each area of a surface demarcated by a plurality of predetermined dividing lines formed by crossing, respectively, characterized by comprising: On the surface side of the wafer, along the planned dividing line, a cutting groove is formed through a cutting blade to a depth corresponding to the complete thickness of the device wafer, and after the cutting groove forming process is performed, it is closed with a sealing material The sealing process of the surface of the wafer including the cutting groove, and after the sealing process is performed, the sealing material provided on the outer peripheral portion of the surface of the wafer is not removed, and the surface side of the wafer is photographed by visible light means to detect an alignment mark through the sealing material, to detect the alignment process of the planned dividing line to be laser-processed based on the alignment mark, and after the alignment process is performed, from the surface side of the wafer, along the The predetermined dividing line is irradiated with a laser beam having a wavelength that is absorbing to the sealing material, and the sealing material in the cutting groove is subjected to laser processing to a depth corresponding to the complete thickness of the device wafer by ablation processing. The laser processing groove forming process of the groove, and after the laser processing groove forming process is performed, the protective member sticking process of adhering the protective member on the surface of the wafer, and the protective member sticking process after the implementation of the protective member sticking process, from the The back side of the wafer is ground to the complete thickness of the device chip to expose the laser processing groove, and is divided into each of the front and four sides surrounded by the sealing material. The division process of the device wafer; the calibration process is carried out while irradiating light from an oblique direction through the oblique light means in the range photographed by the visible light photographing means.
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