TW201735138A - 晶圓的加工方法 - Google Patents
晶圓的加工方法 Download PDFInfo
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- TW201735138A TW201735138A TW105136690A TW105136690A TW201735138A TW 201735138 A TW201735138 A TW 201735138A TW 105136690 A TW105136690 A TW 105136690A TW 105136690 A TW105136690 A TW 105136690A TW 201735138 A TW201735138 A TW 201735138A
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- 238000012545 processing Methods 0.000 claims abstract description 107
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- 239000002184 metal Substances 0.000 claims description 45
- 229910052751 metal Inorganic materials 0.000 claims description 45
- 238000000034 method Methods 0.000 claims description 8
- 230000001678 irradiating effect Effects 0.000 claims description 7
- 238000012360 testing method Methods 0.000 claims description 5
- 239000000758 substrate Substances 0.000 claims description 3
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- 238000005259 measurement Methods 0.000 description 2
- 238000005096 rolling process Methods 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 229910009372 YVO4 Inorganic materials 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 229910052732 germanium Inorganic materials 0.000 description 1
- GNPVGFCGXDBREM-UHFFFAOYSA-N germanium atom Chemical compound [Ge] GNPVGFCGXDBREM-UHFFFAOYSA-N 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 239000011120 plywood Substances 0.000 description 1
- 229910052724 xenon Inorganic materials 0.000 description 1
- FHNFHKCVQCLJFQ-UHFFFAOYSA-N xenon atom Chemical compound [Xe] FHNFHKCVQCLJFQ-UHFFFAOYSA-N 0.000 description 1
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Abstract
基於和雷射加工裝置相關的因素造成加工位置產生誤差之情況下,亦可以對所要位置進行加工。雷射加工溝形成中,藉由攝像手段(36)針對包含對晶圓照射脈衝雷射光線而產生之射束電漿(300)的加工區域進行攝像,對脈衝雷射光線之射束電漿(300)之位置與事先設定的加工位置(36a)間之位置關係進行計測,據此而在雷射加工中,可以即時把握所要位置是否被加工,當發生加工位置偏離之情況下,可以立即修正加工位置。
Description
本發明關於針對事先設定的特定的應加工之位置與藉由雷射加工實際被加工的位置間之位置關係進行計測之同時,對晶圓進行加工的晶圓的加工方法。
半導體元件製造過程中,係在半導體晶圓等大略圓板狀之被加工材(work piece)之表面形成IC或LSI等多數電子電路,接著,研削被加工材之背面並實施加工成為特定厚度等之處理,之後,藉由照射雷射光線將形成有電子電路的元件區域沿著稱為街道(street)之分割預定劃線切斷而對被加工材進行分割,由1片被加工材獲得多數元件(例如參照專利文獻1)。
[專利文獻1]特開2012-151225號公報
但是,照射的雷射光線受到光學系產生變形等和裝置相關之因素,導致雷射光線之聚光光點之位置不位於應加工的位置,存在無法對所要之加工位置進行加工之問題。
本發明有鑑於該問題,目的在於即使基於和雷射加工裝置相關的因素造成加工位置產生誤差之情況下,亦可以對所要之加工位置實施雷射加工。
本發明提供之晶圓的加工方法,係針對在基板之表面在以格子狀形成的複數條分割預定劃線所劃分的各區域形成有元件的晶圓,藉由脈衝雷射光線照射手段照射脈衝雷射光線而對晶圓進行加工者,其特徵在於具備:對準步驟,藉由雷射加工裝置之對準手段對該晶圓之加工位置即該分割預定劃線進行檢測;雷射加工溝形成步驟,在實施該對準步驟之後,藉由該脈衝雷射光線照射手段沿著該分割預定劃線照射脈衝雷射光線,而形成雷射加工溝;及加工位置計測步驟,在該雷射加工溝形成步驟之實施中,藉由攝像手段針對包含藉由該脈衝雷射光線照射手段對該晶圓照射脈衝雷射光線而產生之射束電漿的加工區域進行攝像,對該脈衝雷射光線之該射束電漿之位置與事先設定的加工位置之間的位置關係進行計測。
在晶圓之該分割預定劃線以一定之週期形成
有測試用之金屬圖案的情況下,本發明之晶圓的加工方法中進一步具備:金屬圖案位置記憶步驟,在實施對準步驟之前,將金屬圖案之週期及位置資訊記憶於雷射加工裝置之記憶手段;加工位置計測步驟中,係依據金屬圖案位置記憶步驟中事先記憶的金屬圖案之週期及位置資訊,於金屬圖案位置以外之位置中對該位置關係進行計測。
本發明中,在雷射加工溝形成步驟之實施中,藉由攝像手段針對包含對晶圓照射脈衝雷射光線所產生之射束電漿的加工區域進行攝像,對脈衝雷射光線之射束電漿之位置與事先設定的加工位置之間的位置關係進行計測,因此在雷射加工中,可以即時把握所要之位置是否被加工。因此,發生加工位置偏離之情況下,可以立即修正加工位置。
又,對金屬圖案照射脈衝雷射光線時之射束電漿,與對未形成有金屬圖案的部分照射脈衝雷射光線時之射束電漿,在大小及亮度上均存在差異,因此容易產生錯誤辨識,但在晶圓之分割預定劃線以一定之週期形成測試用之金屬圖案的情況下,將金屬圖案之週期及位置予以記憶,避開金屬圖案進行切痕檢查(kerf check),因此可以在無錯誤辨識下進行切痕檢查,可以高的加工精度進行加工。
1‧‧‧雷射加工裝置
2‧‧‧吸盤平台
20‧‧‧吸附部
21‧‧‧框體
22‧‧‧夾板部
23‧‧‧旋轉驅動部
24‧‧‧蓋部
3‧‧‧雷射光線照射手段
30‧‧‧雷射加工溝
300‧‧‧射束電漿
30a‧‧‧射束電漿中央線
31‧‧‧脈衝雷射光線振盪手段
311‧‧‧脈衝雷射光線振盪器
312‧‧‧重複頻率設定手段
32‧‧‧聚光器
321‧‧‧聚光透鏡
33‧‧‧分色鏡
34‧‧‧閃光燈照射手段
341‧‧‧閃光燈源
342‧‧‧光圈
343‧‧‧透鏡
344‧‧‧方向變換鏡
35‧‧‧射束***器
36‧‧‧攝像手段
36a‧‧‧基準線
361‧‧‧群組透鏡
361a‧‧‧像差補正透鏡
361b‧‧‧成像透鏡
362‧‧‧攝像元件(CCD)
37‧‧‧偏離量
4‧‧‧X軸方向移動手段
40‧‧‧滾珠螺桿
41‧‧‧導軌
42‧‧‧馬達
43‧‧‧軸承部
44‧‧‧移動基台
441‧‧‧被導引溝
45‧‧‧X軸方向位置檢測手段
451‧‧‧線性定標器
452‧‧‧讀取頭
5‧‧‧Y軸方向移動手段
50‧‧‧滾珠螺桿
51‧‧‧導軌
52‧‧‧馬達
53‧‧‧軸承部
54‧‧‧移動基台
541‧‧‧被導引溝
55‧‧‧Y軸方向位置檢測手段
551‧‧‧線性定標器
552‧‧‧讀取頭
60‧‧‧靜止基台
61‧‧‧支撐構件
62‧‧‧殼體
7‧‧‧對準手段
70‧‧‧攝影機
80‧‧‧控制手段
81‧‧‧記憶手段
W‧‧‧晶圓
W1‧‧‧表面
D‧‧‧元件
L、LX1~LX5、LY1~LY3‧‧‧分割預定劃線
11~16‧‧‧區域
T‧‧‧黏帶
F‧‧‧框架
17、18‧‧‧金屬圖案
KP‧‧‧關鍵圖案
[圖1]雷射加工裝置之一例之表示用的斜視圖。
[圖2]裝配於雷射加工裝置的雷射光線照射手段之表示用的方塊構成圖。
[圖3](a)係加工對象之晶圓之例之表示用的平面圖,(b)係晶圓之一部分擴大平面圖。
[圖4]將元件中之關鍵圖案與分割預定劃線之位置關係之一部分擴大的平面圖。
[圖5]晶圓之中心及邊緣之表示用的平面圖。
[圖6](a)係1條分割預定劃線之雷射加工開始時之表示用的正面圖,(b)係1條分割預定劃線之雷射加工終了時之表示用的正面圖,(c)係形成的雷射加工溝之表示用的斷面圖。
[圖7]脈衝雷射光線之照射與切痕檢查之用的光之照射之時序之表示用的時序圖。
[圖8]攝像手段之基準線與雷射加工溝及射束電漿之間的位置關係之例之表示用的平面圖。
圖1所示雷射加工裝置1,係藉由雷射光線照射手段3對吸盤平台2所保持的晶圓照射脈衝雷射光線的進行雷射加工之裝置,吸盤平台2係藉由X軸方向移動手段4及Y軸方向移動手段5被驅動而可於X軸方向及Y
軸方向移動。
吸盤平台2具備:將晶圓吸附保持的吸附部20;圍繞吸附部20並予以保持的框體21;及固定於框體21之外周部的夾板部22。吸盤平台2之下部連結於使吸盤平台2旋轉的旋轉驅動部23。旋轉驅動部23被蓋部24由上方進行覆蓋。
X軸方向移動手段4具備:配設於靜止基台60上,朝X軸方向延伸的滾珠螺桿40;與滾珠螺桿40平行配設的一對導軌41;連結於滾珠螺桿40之一端、使滾珠螺桿40旋轉的馬達42;對滾珠螺桿40之另一端進行支撐的軸承部43;及內部之螺帽螺合於滾珠螺桿40,而且形成於其下部的被導引溝441滑接於導軌41的移動基台44;構成為藉由馬達42使滾珠螺桿40朝正逆兩方向之任一方向旋轉,而使移動基台44被導軌41導引而朝+X方向或-X方向移動。馬達42藉由具備CPU、記憶體等的控制手段80進行控制。
又,X軸方向移動手段4具備對吸盤平台2之X軸方向之位置進行檢測的X軸方向位置檢測手段45。X軸方向位置檢測手段45由以下構成:沿著導軌41配設的線性定標器451;及配設於移動基台44,和移動基台44同時沿著線性定標器451移動的讀取頭452。讀取頭452例如每隔1μm將1脈衝之脈衝信號傳送至控制手段80。控制手段80對讀取頭452傳送來的脈衝信號進行計數,據此而對吸盤平台2之X軸方向之位置進行辨識。
又,馬達42使用脈衝馬達之情況下,藉由對控制手段80輸出至脈衝馬達的驅動脈衝進行計數,可以對吸盤平台2之X軸方向之位置進行辨識。又,馬達42使用伺服馬達之情況下,將對伺服馬達之旋轉數進行檢測的旋轉編碼器所輸出的脈衝信號傳送至控制手段80,藉由控制手段80計數該脈衝信號,可以對吸盤平台2之X軸方向位置進行檢測。
Y軸方向移動手段5具備:朝Y軸方向延伸的滾珠螺桿50;與滾珠螺桿50平行配設的一對導軌51;連結於滾珠螺桿50之一端,使滾珠螺桿50旋轉的馬達52;將滾珠螺桿50之另一端進行支撐的軸承部53;及內部之螺帽螺合於滾珠螺桿50,而且形成於其下部的被導引溝541滑接於導軌51的移動基台54;構成為藉由馬達52使滾珠螺桿50朝正逆兩方向之任一方向旋轉,而使移動基台54被導軌51導引而沿+Y方向或-Y方向移動。馬達52被控制手段80控制。
又,Y軸方向移動手段5具備對吸盤平台2之Y軸方向之位置進行檢測的Y軸方向位置檢測手段55。Y軸方向位置檢測手段55由以下構成:沿著導軌51配設的線性定標器551;配設於移動基台54,和移動基台54同時沿著線性定標器551移動的讀取頭552。讀取頭552例如以每隔1μm傳送1脈衝之脈衝信號至控制手段80。控制手段80藉由對讀取頭552傳送來的脈衝信號進行計數,而對吸盤平台2之Y軸方向之位置進行辨識。
又,馬達52使用脈衝馬達之情況下,藉由對控制手段80輸出至脈衝馬達的驅動脈衝進行計數,可以對吸盤平台2之Y軸方向之位置進行辨識。又,馬達52使用伺服馬達之情況下,將對伺服馬達之旋轉數進行檢測的旋轉編碼器所輸出的脈衝信號傳送至控制手段80,藉由控制手段80計數該脈衝信號,可以對吸盤平台2之Y軸方向位置進行檢測的。
支撐構件61立設於靜止基台60之後部(+Y方向)側,殼體62由支撐構件61朝-Y方向側延伸。於殼體62具備雷射光線照射手段3及對準手段7。
對準手段7具備攝影機70,依據攝影機70對吸盤平台2所保持的晶圓進行攝像而取得的影像,可以檢測應進行雷射加工的位置。
如圖2所示,雷射光線照射手段3具備:脈衝雷射光線振盪手段31;將脈衝雷射光線振盪手段31振盪產生的脈衝雷射光線聚光並使其照射至吸盤平台2所保持的晶圓W之聚光器32;及配設於脈衝雷射光線振盪手段31與聚光器32之間,將脈衝雷射光線振盪手段31振盪產生的脈衝雷射光線引導至聚光器32的分色鏡33。脈衝雷射光線振盪手段31係由脈衝雷射振盪器311及附設於其的重複頻率設定手段312構成。聚光器32具備將脈衝雷射光線振盪手段31振盪產生的脈衝雷射光線LB進行聚光的聚光透鏡321。脈衝雷射光線振盪手段31與聚光器32之間所配設的分色鏡33,係具有使脈衝雷射光線
振盪手段31振盪產生的脈衝雷射光線LB反射並導引至聚光器32,而且使脈衝雷射光線LB之波長以外的波長之光透過之機能。
雷射光線照射手段3具備:將光照射至分色鏡33與聚光器32之間之路徑的閃光燈照射手段34;配設於閃光燈照射手段34與分色鏡33之間,使來自吸盤平台2所保持的晶圓W之光分歧的射束***器35;及配設於射束***器35中被分歧的路徑之攝像手段36。閃光燈照射手段34例如由以下構成:由氙氣閃光燈管構成的發出白色光的閃光燈源341;對由閃光燈源341發出的白色光之視野尺寸進行規定的光圈342;使通過光圈342的白色光聚光於吸盤平台2所保持的晶圓W之透鏡343;及使經由透鏡343聚光的白色光朝向射束***器35而進行方向變換的方向變換鏡344。閃光燈源341經由控制手段80的控制而發光。
射束***器35將經由閃光燈照射手段34之方向變換鏡344導引的白色光導入分色鏡33,而且將來自吸盤平台2所保持的晶圓W之光導引至攝像手段36。
攝像手段36係由以下構成:由像差補正透鏡361a與成像透鏡361b構成的群組透鏡361,及對群組透鏡361所抓捕的影像進行攝像的攝像元件(CCD)362;攝取之影像信號被傳送至控制手段80。
圖1所示控制手段80,係連接於具有記憶體等記憶元件的記憶手段81,參照記憶於記憶手段81的資
訊對各部位進行控制。
接著,說明使用上述構成的雷射加工裝置1,在圖3(a)所示晶圓W之表面W1形成雷射加工溝,針對雷射加工溝是否形成於特定位置進行檢查的方法。
在該晶圓W之表面W1,在以格子狀形成的分割預定劃線(以下標記為「劃線」)L所劃分的各區域形成元件D。該晶圓W之背面貼附有黏帶T。在黏帶T之外周部貼附有環狀之框架F,晶圓W透過黏帶T被框架F支撐。在圖1所示吸盤平台2之吸附部20中透過黏帶T使晶圓W被吸附保持,框架F藉由夾板部22被固定。
構成晶圓W的各元件D,係在半導體製造過程中被形成於矽等基板之表面上者,各元件D內之電路圖案係在曝光機(Stepper)中透過標線片(reticle)進行投影曝光而形成。標線片上形成有各元件D之電路圖案,製作1片晶圓W時使用複數個標線片。
晶圓W係由和使用的標線片對應被分割的區域構成,圖3(a)所示晶圓W係具備區域11~16。如圖3(b)所示,例如在各區域11~16形成朝X軸方向延伸的劃線LX1~LX5及朝Y軸方向延伸的劃線LY1~LY3。依據各標線片之每一個決定X軸方向之劃線數及Y軸方向之劃線數。
如圖3(b)所示,在區域11~16之劃線LX1及LX3,形成由銅等金屬構成的稱為TEG(Test Element Group)之金屬圖案17。又,在劃線LY3亦形成金屬圖案18。金屬圖案17、18以一定之週期形成於區域11~16之每一區域。因此,在任一區域中在同一處形成金屬圖案17、18。圖3(b)之例中,係在劃線LX1及LX3以及劃線LY3形成金屬圖案17、18,但形成有金屬圖案的劃線不限定於彼等劃線。金屬圖案17、18作為測試用元件之機能,係為了找出發生於各元件D之設計上或製造上之問題者。金屬圖案17、18亦透過標線片藉由濺鍍器、CVD等形成,因此在標線片形成和金屬圖案17、18對應的遮罩。
如上述說明,作為標線片之規格,設定有X軸方向之劃線數、Y軸方向之劃線數、形成有金屬圖案之劃線、金屬圖案之週期及位置資訊等資訊。彼等資訊例如由作業員使用雷射加工裝置1所具備的未圖示的輸入手段(例如鍵盤、觸控面板等)進行輸入,記憶於圖1所示記憶手段81。又,彼等資訊亦可以作為來自前工程之資訊,通過任一媒體被讀入記憶手段81而予以記憶。
作業員係依據和標線片之規格相關的資訊,而將欲實施雷射加工溝是否被形成於所要位置之檢査(切痕檢查)的劃線,設定為未形成有金屬圖案17、18的劃線並予以輸入,記憶於記憶手段81。例如圖3(b)之例中,劃線LX4被設為切痕檢查之對象。
作業員係將晶圓W之最外劃線中和標線片之那一劃線相當者之資訊輸入至記憶手段81。例如圖3(b)所示區域15之劃線LX1為晶圓W之最外劃線,因此記憶手段81記憶著標線片之劃線LX1為最外劃線之資訊。
另外,作業員亦將雷射加工後對雷射加工溝進行檢查時X軸方向之檢查開始位置XS記憶於記憶手段81。檢查開始位置XS位於從晶圓W之中心O起朝X軸方向僅位移X1之位置,該X1之值被記憶於記憶手段81。作業員藉由圖1所示攝影機70對晶圓W進行攝像,觀看顯示在未圖示的監控器之影像,並選擇未形成有金屬圖案17、18的位置來決定X1之值。
彼等之外,晶圓W之尺寸(直徑)及鄰接的劃線間之距離亦即分度尺寸(index size)(某一劃線之中央至其鄰接之劃線之中央之間之距離)等資訊亦被記憶於記憶手段81。
又,作業員針對之後之對準步驟中檢測應加工的劃線時的圖案匹配所使用的關鍵圖案進行規定,並將包含該關鍵圖案的影像記憶於記憶手段81。例如事先選定元件D中具有特徵形狀的特定電路圖案、例如圖4所示關鍵圖案KP作為圖案匹配用之關鍵圖案,將包含該關鍵圖案KP的影像記憶於記憶手段81。又,在記憶手段81亦記憶著從
該關鍵圖案KP至朝鄰接的X軸方向延伸的劃線(例如劃線LX2)之中央LO之間之距離DY之值。又,作為關鍵圖案可以不使用元件D之電路圖案,而使用圖案匹配用之設於晶圓W之元件D以外之部分者。
吸盤平台2所保持的晶圓W,其位置藉由吸盤平台2沿著-X方向移動而被定位於攝影機70之下方。接著,圖4所示2個關鍵圖案KP,例如位於X軸方向之兩端部的2個關鍵圖案KP係藉由圖案匹配進行檢測。
控制手段80分別進行與特定劃線隣接的2個關鍵圖案KP間之圖案匹配,求出檢測的2個圖案之位置之Y座標。如圖4所示,當求出的2個圖案之Y座標一致時,控制手段80判斷各劃線平行朝向X軸方向。另外,2個圖案之Y座標不一致之情況下,控制手段80算出連結2個圖案的線與X軸所形成的角度,對圖1所示旋轉驅動部23進行驅動使吸盤平台2旋轉該角度分,使X軸與連結2個圖案的線成為平行。接著,控制手段80對劃線LX2之中央線LO之Y座標進行辨識。
接著,使吸盤平台2旋轉之同時,對晶圓W之周緣例如3處,例如對圖5所示周緣區域E1、E2、E3進行攝
像取得各別之影像,藉由邊緣檢測,控制手段80分別求出晶圓W之周緣上之3點之X-Y座標。具體而言,在周緣區域E1、E2、E3之各別之影像中,進行影像處理而將畫素值在某一臨限值以上變化的部分辨識為邊緣,據此而求出3點之X-Y座標。控制手段80依據該3點之座標求出晶圓W之中心O之X-Y座標。
接著,控制手段80依據事先記憶於記憶手段81的晶圓W之尺寸(直徑),將中心O起朝外周側分離半徑距離的位置設為晶圓W之邊緣E,算出該邊緣之Y座標。依據邊緣之Y座標及記憶於記憶手段81的晶圓W之分度尺寸及X軸方向之劃線數,求出最初進行雷射加工的最外劃線之Y座標並將其記憶於記憶手段81。該最外劃線係區域14、15、16之劃線LX1。如上述說明,藉由以晶圓W之中心O為基準求出最外劃線LX1,假設晶圓W搬入吸盤平台2時,吸盤平台2之中心與晶圓W之中心不一致時,亦可以正確求出最外劃線LX1之位置。
又,作為最外劃線之檢測用,而在晶圓W之元件以外之區域形成特別的目標圖案,依據與該目標圖案間之位置關係,求出最外劃線之位置亦可。此情況下,即使吸盤平台2之中心與晶圓W之中心不一致時,亦可以正確求出最外劃線LX1之位置。
如上述說明,雷射加工及藉由雷射加工而形成的雷射加工溝之檢查所必要的資訊被記憶於記憶手段81之後,沿著各劃線進行實際之雷射加工之同時,針對經由雷射加工所形成的雷射加工溝是否被形成於所要位置進行檢査(切痕檢查)。
首先,使聚光器32位於對準步驟中檢測出的最外劃線亦即劃線LX1之一端之正上方。接著,如圖6(a)所示,使雷射光線照射手段3之聚光器32所照射的脈衝雷射光線之聚光點P之位置位於晶圓W之表面W1附近。接著,由聚光器32對晶圓W照射具有吸收性的波長(例如355nm)之脈衝雷射光線之同時,藉由圖1所示X軸方向移動手段4使吸盤平台2朝-X方向以特定移動速度進行移動加工前進。
接著,如圖6(b)所示,在劃線LX1之另一端(圖6(b)中右端)到達聚光器32之正下方位置時,停止脈衝雷射光線之照射之同時,停止吸盤平台2之移動。結果,如圖6(b)及圖6(c)所示,在半導體晶圓W之表面W1沿著劃線LX1形成雷射加工溝30。
雷射加工依據例如以下之加工條件進行。
雷射光線之光源:YVO4雷射或YAG雷射
波長:355nm
重複頻率:50kHz
平均輸出:3W
聚光光點直徑:φ10μm
加工前進速度:100mm/秒
如後述說明,切痕檢查係藉由對雷射光線之照射產生的射束電漿進行攝像而進行,但如圖3(b)所示,在劃線LX1形成有金屬圖案17,因此對經由劃線LX1之加工而形成的雷射加工溝30進行攝像來進行切痕檢查時,在形成有金屬圖案17之處與未形成有金屬圖案17之處,射束電漿之大小或亮度呈現完全不同,在和通常之射束電漿不同的位置有可能發生錯誤辨識。因此,對劃線LX1不進行切痕檢查,而移行至次一劃線LX2之加工。
接著,使聚光器32朝+Y方向移動記憶於記憶手段81的分度尺寸量,使劃線LX2之位置位於聚光器32之正下方。接著,和劃線LX1之加工時同樣地,使雷射光線照射手段3之聚光器32所照射的脈衝雷射光線之聚光點P之位置位於晶圓W之表面W1附近,由聚光器32對晶圓W照射具有吸收性的波長之脈衝雷射光線之同時,使吸盤平台2朝和劃線LX1之加工時之相反方向(+X方向)移動,沿著劃線LX2形成雷射加工溝30。
接著,使聚光器32朝+Y方向移動記憶於記憶手段81的分度尺寸量,使劃線LX3之位置位於聚光器32之正下方。之後之劃線LX3之加工係和劃線LX1同樣地進行。
接著,使聚光器32朝+Y方向移動記憶於記
憶手段81的分度尺寸量,使劃線LX4之位置位於聚光器32之正下方。接著,和劃線LX2之加工時同樣地,使雷射光線照射手段3之聚光器32所照射的脈衝雷射光線之聚光點P之位置位於晶圓W之表面W1附近,由聚光器32對晶圓W照射具有吸收性的波長之脈衝雷射光線之同時,使吸盤平台2朝劃線LX3之加工時之相反方向(+X方向)移動而形成雷射加工溝30。
金屬圖案位置記憶步驟中係以劃線LX4作為切痕檢查對象並記憶於記憶手段81,因此本步驟中,控制手段80將該資訊由記憶手段81讀出,在劃線LX4中形成有金屬圖案17、18的位置以外之位置中,對經由劃線LX4之加工被形成的雷射加工溝進行切痕檢查。
雷射光線照射手段3之脈衝雷射光線振盪手段31振盪產生的脈衝雷射光線之重複頻率為50kHz,因此如圖7所示,吸盤平台2所保持的半導體晶圓W係每隔20μs實施1脈衝之脈衝雷射光線LB之照射。
切痕檢查用之影像取得,係依據每隔一定時間間隔進行。例如圖7所示例中,在第2個脈衝雷射光線照射之後,控制手段80作動閃光燈照射手段34之閃光燈源341,而且於時序t1開放攝像手段36之快門。因此取得時序t1間所照射的脈衝雷射光線LB之射束電漿且取得攝像手段36對加工區域進行攝像的時序t1間之影像。
又,閃光燈源341之發光起經過100μs之後,再度開啟閃光燈源341之發光,藉由攝像手段36進行同樣之攝像。
圖7之例中設定成為,自脈衝雷射光線之振盪開始起50μs之時點發出白色光WL,以後每經過100μs發射白色光WL而對吸盤平台2所保持的晶圓W進行照射。
對晶圓W照射脈衝雷射光線時,係如圖8所示,產生射束電漿300。圖8所示影像係藉由攝像手段36攝取加工區域之影像者,該射束電漿300,係在白色光WL發光之時序,透過聚光透鏡321、分色鏡33及射束***器35被導入攝像手段36。被導入攝像手段36的光,係透過由像差補正透鏡361a與成像透鏡361b構成的群組透鏡361而成像於攝像元件(CCD)362。攝像元件(CCD)362將成像的影像信號傳送至控制手段80。控制手段80係將由攝像元件(CCD)362每隔100μs傳送來的影像信號記憶於記憶手段81。射束電漿300產生於雷射加工溝30之寬度方向中央部分,因此藉由檢測射束電漿300之位置,可以檢測雷射加工溝30之位置。切痕檢查,係當聚光器32之位置在劃線LX4上如圖3所示位於從晶圓W之中心O起朝-X方向僅位移X1之位置時開始進行。該切痕檢查之開始時係設為圖7中的時間0。
如圖8所示,在攝像手段36之中央形成有朝X軸方向延伸的基準線36a。另外,於圖8之例中,通過射束電漿300之中心朝X軸方向延伸的射束電漿中央線
30a,亦為雷射加工溝30之中央線。因此,當射束電漿中央線30a與基準線36a重疊時,控制手段80判斷對準步驟中事先設定的加工位置被進行雷射加工。又,即使射束電漿中央線30a不與基準線36a重疊,但彼等在Y軸方向之偏離量37小於特定臨限值之情況下,亦判斷事先設定的加工位置被進行雷射加工。該臨限值事先記憶於記憶手段81。另外,當偏離量37在該臨限值以上之情況下,控制手段80判斷雷射加工溝30與劃線LX4之中央線之間存在不容許之偏離,無法對劃線LX4之所要之位置進行加工。如上述說明,藉由對射束電漿300之位置與設定的加工位置之間的位置關係進行計測,可以判斷能否對所要之位置實施雷射加工。
圖8之例中,雷射加工溝30相較於基準線36a更偏離-Y方向,因此控制手段80判斷偏離量37在臨限值以上,並立即、亦即在劃線LX4之加工中,對圖1所示Y軸方向移動手段5之馬達52進行驅動以使吸盤平台2朝+Y方向偏移偏離量37,而對晶圓W之Y軸方向之位置進行補正。如此則,基準線36a成為位於雷射加工溝30之中央,而可以對劃線LX4之中心進行加工。
又,加工位置之補正可以在劃線LX4之加工終了後進行。又,聚光器32構成為可以朝Y軸方向移動之情況下,不進行吸盤平台2之移動,而藉由使聚光器32之Y軸方向之位置偏移來補正雷射加工溝之形成位置亦可。
如上述說明,藉由對射束電漿300進行攝像,在射束電漿300之位置偏離所要位置之情況下,以使雷射加工溝30成為所要位置的方式進行補正,因此可以正確對所要位置進行雷射加工。而且,藉由雷射光線照射手段3所具備的攝像手段36對射束電漿進行攝像,可以在脈衝雷射光線照射之間隔對射束電漿進行攝像,因此可以和雷射加工並行地檢測射束電漿之位置,亦可以立即依據該檢測結果進行雷射照射位置之補正。
上述實施形態中,係對未形成有金屬圖案17、18的劃線LX4進行切痕檢查,對於形成有金屬圖案之劃線,亦可以避開形成有金屬圖案之部分進行切痕檢查。
上述實施形態中說明針對在分割預定劃線形成有金屬圖案的晶圓進行加工進行切痕檢查之情況,但本發明亦適用對無金屬圖案之晶圓進行加工之情況。此情況下,無需將金屬圖案之位置記憶於記憶手段31,因此在對準步驟之前,將最外劃線之位置、晶圓W之尺寸、分度尺寸記憶於記憶手段81即可。又,加工位置計測步驟中對任一劃線進行切痕檢查均可。
雷射加工裝置亦可以是具備2個聚光器,由2個聚光器同時將2個脈衝雷射光線照射至1條分割預定劃線而形成雷射加工溝之型態。使用該型態之雷射加工裝置之情況下,對2個射束電漿進行攝像,求出連結2個射束電漿之中心間之線之中點與基準線36a間之偏離量,在該
偏離量不在特定臨限值範圍內時,和上述同樣地進行補正。據此,可以在所要位置形成雷射加工溝。
30‧‧‧雷射加工溝
30a‧‧‧射束電漿中央線
36‧‧‧攝像手段
36a‧‧‧基準線
37‧‧‧偏離量
300‧‧‧射束電漿
Claims (2)
- 一種晶圓的加工方法,係針對在基板之表面在以格子狀形成的複數條分割預定劃線所劃分的各區域形成有元件的晶圓,藉由脈衝雷射光線照射手段照射脈衝雷射光線而對晶圓進行加工者,其特徵在於具備:對準步驟,藉由雷射加工裝置之對準手段對該晶圓之加工位置亦即該分割預定劃線進行檢測;雷射加工溝形成步驟,在實施該對準步驟之後,藉由該脈衝雷射光線照射手段沿著該分割預定劃線照射脈衝雷射光線而形成雷射加工溝;及加工位置計測步驟,在該雷射加工溝形成步驟之實施中,藉由攝像手段針對包含藉由該脈衝雷射光線照射手段對該晶圓照射脈衝雷射光線而產生之射束電漿的加工區域進行攝像,對該脈衝雷射光線之該射束電漿之位置與事先設定的加工位置之間的位置關係進行計測。
- 如申請專利範圍第1項之晶圓的加工方法,其中在該晶圓之該分割預定劃線以一定之週期形成測試用之金屬圖案,進一步具備:金屬圖案位置記憶步驟,在實施該對準步驟之前,將該金屬圖案之週期及位置資訊記憶於雷射加工裝置之記憶手段;在該加工位置計測步驟中,係依據該金屬圖案位置記憶步驟中事先記憶的該金屬圖案之週期及位置資訊,於該金屬圖案位置以外之位置中對該位置關係進行計測。
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