TWI724273B - SiC晶圓之製成方法 - Google Patents
SiC晶圓之製成方法 Download PDFInfo
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Abstract
[課題]提供一種可自單晶SiC晶棒減少浪費經濟地製成晶圓之晶圓製成方法。[解決手段]一種SiC晶圓之製成方法,其包括:端面平坦化步驟,係使晶棒2之端面平坦化;剝離層形成步驟,係使對單晶SiC具有穿透性之波長的雷射光線LB之聚光點FP位於從晶棒2的端面起算相當於應製成之SiC晶圓厚度之深度處,而將雷射光線LB照射於晶棒2來形成使SiC晶圓剝離之剝離層42;硬板配置步驟,係藉由接著劑將硬板44配置於形成有剝離層42之晶棒2的端面;剝離步驟,係將SiC晶圓58與硬板44一同自晶棒2之剝離層42剝離。
Description
本發明係關於一種從單晶SiC晶棒製成晶圓之晶圓製成方法。
IC、LSI、和LED等的元件,乃在由Si(矽)或Al2
O3
(藍寶石)等作為材料之晶圓的表面積層功能層,並藉由分割預定線劃分而形成。另外,功率元件、LED等,係在以單晶SiC(碳化矽)作為素材之晶圓的表面積層功能層,再由分割預定線劃分而形成。形成有元件之晶圓,係藉由切削裝置、雷射加工裝置對分割預定線施予加工,以分割成各個元件,所分割之各元件乃用於行動電話、個人電腦等電子設備。
形成元件之晶圓,一般係用線鋸將圓柱狀晶棒加以薄片切割所製成的。所切割出之晶圓的表面及背面,係藉由研磨而精製成鏡面的(參照專利文獻1)。可是,若用線鋸切割晶棒,對切割出之晶圓的表面及背面進行研磨,則大部分(70~80%)的晶棒會被丟棄,存在不經濟的問題。尤其是單晶SiC晶棒,其硬度較高,難以用線鋸切割,需花費許多時間,所以製造效率差,而且晶棒單價較高,要有效地製成晶圓,乃是一大課題。
有鑒於此,有人提出以下技術:將對單晶SiC具有穿透性之波長的雷射光線的聚光點定位在單晶SiC晶棒内部,朝單晶SiC晶棒照射雷射光線,於切割預定面形成改質層,再沿著形成改質層之切割預定面,將SiC晶圓從單晶SiC晶棒剝離 (參照專利文獻2)。 [習知技術文獻] [專利文獻]
[專利文獻1]日本特開2000-94221號公報 [專利文獻2]日本特開2013-49161號公報
[發明所欲解決的課題] 但是,將晶圓從晶棒剝離之際,或是於晶圓的表面形成元件之際,為了使晶圓保有強度,係將從單晶SiC晶棒剝離之SiC晶圓的厚度設定成700~800μm左右;在將SiC晶圓分割成各個元件之際,為了加強其散熱性,係將SiC晶圓的背面研削500~600μm左右,使SiC晶圓的厚度薄化成100μm前後,因此要更經濟地製成SiC晶圓乃是吾人所欲解決之課題。 所以,本發明之目的在於提供一種:可從單晶SiC晶棒經濟地製成SiC晶圓的SiC晶圓之製成方法。
[解決課題的技術手段] 根據本發明,提供了一種SiC晶圓製成方法,係自單晶SiC晶棒製成SiC晶圓的SiC晶圓,其包括:端面平坦化步驟,使單晶SiC晶棒之端面平坦化;剝離層形成步驟,在該端面平坦化步驟實施之後,使對單晶SiC具有穿透性之波長的雷射光線之聚光點位於從單晶SiC晶棒的端面起算相當於欲製成之SiC晶圓厚度之深度處,將雷射光線照射於單晶SiC晶棒,形成使SiC晶圓剝離之剝離層;硬板配置步驟,將硬板以接著劑配置於形成有剝離層之單晶SiC晶棒的端面;剝離步驟,在該硬板配置步驟實施後,將SiC晶圓與該硬板一同自單晶SiC晶棒之剝離層剝離;剝離面平坦化步驟,使自單晶SiC晶棒剝離之SiC晶圓的剝離面平坦化;及元件形成步驟,於平坦化的剝離面形成元件。
較佳為:單晶SiC晶棒具有:第一面;第二面,在該第一面相反側;c軸,自該第一面至該第二面相對於該第一面之垂直線傾斜;以及c面,正交於該c軸,而該c面與該第一面形成偏角;在該剝離層形成步驟中,使對單晶SiC具有穿透性之波長的雷射光線之聚光點位於從該第一面起算相當於SiC晶圓厚度之深度處,並且使單晶SiC晶棒與該聚光點在和形成該偏角的第2方向正交之第1方向上相對移動,而SiC分離成Si與C,且下個照射的雷射光線被先前形成之C所吸収,並連鎖地使SiC分離成Si與C而形成直線狀改質層及裂痕,並使單晶SiC晶棒與該聚光點在形成該偏角的方向上相對移動,來進行預定量的分度進給而形成剝離層。
[發明功效] 在本發明的SiC晶圓之製成方法中,SiC晶圓由硬板所補強,因此在將SiC晶圓從單晶SiC晶棒剝離之際、或在SiC晶圓的表面形成元件之際等情況下,無須為了防止SiC晶圓之損傷,而使SiC晶圓的厚度為相對較厚的700~800μm左右以保有SiC晶圓的強度;即使SiC晶圓的厚度為相對較薄的200μm左右,也可在將SiC晶圓從單晶SiC晶棒剝離之際、或在SiC晶圓的表面形成元件之際等情況下,防止SiC晶圓之損傷。 從而,在本發明的SiC晶圓之製成方法當中,因可使從單晶SiC晶棒剝離之SiC晶圓的厚度為相對較薄的200μm左右,所以為了加強散熱性而使SiC晶圓薄化之際所研削的(拋棄)量得以減少,而且可從單晶SiC晶棒製成的晶圓數量得以增加,可更經濟地從單晶SiC晶棒製成SiC晶圓。
以下,參照圖式,說明本發明的晶圓製成方法之實施形態。
如圖1所示之整體,呈圓柱形狀六方晶單晶SiC晶棒2(以下簡稱「晶棒2」)具有:圓形狀第一面4、在第一面4相反側之圓形狀第二面6、位於第一面4及第二面6之間的外周面8、自第一面4至第二面6之c軸(<0001>方向)、及正交於c軸之c面({0001}面)。圖示之晶棒2當中,c軸相對於第一面4之垂直線10傾斜,c面與第一面4形成了偏角(Off Angle)α(例如α=1、3、6度)。偏角α所形成之方向於圖1係以箭頭A表示。另外,於晶棒2之外周面8,形成了表示結晶方位之矩形狀第一定向平面12及第二定向平面14。第一定向平面12,平行於形成偏角α之方向A;第二定向平面14,正交於形成偏角α之方向A。如圖1(b)所示,於垂直線10之方向觀察,第二定向平面14之長度L2,比第一定向平面12之長度L1更短(L2<L1)。
在本實施形態中,首先實施端面平坦化步驟:使晶棒2的端面平坦化。端面平坦化步驟,可使用例如圖2所示其中一部分之研削裝置16來加以實施。研削裝置16具備卡盤台(Chuck Table)18及研削手段20。將工件吸附於上表面而構成之卡盤台18,係藉由旋轉手段(無圖示)以朝上下方向延伸之軸線為中心進行旋轉。研削手段20,係與馬達(無圖示)相連結,並且包含在上下方向上延伸之圓柱狀主軸22、及固定於主軸22下端之圓盤狀輪架24。在輪架24的下表面藉由螺栓26固定著環狀的研削輪28。在研削輪28的下表面之外周緣部,在周方向上間隔地固定著成環狀配置之多個研削磨粒30。如圖2所示,研削輪28的旋轉中心會相對於卡盤台18的旋轉中心進行位移,使研削磨粒30通過卡盤台18的旋轉中心。因此,卡盤台18與研削輪28相互旋轉,同時保持於卡盤台18的上表面之工件的上表面與研削磨粒30相接觸,在此情況下工件的上表面全部由研削磨粒30所研削。
參照圖2繼續說明,在端面平坦化步驟當中,首先,將應研削的晶棒2的端面(圖示實施形態中為第一面4)朝上,使晶棒2吸附於研削裝置16之卡盤台18的上表面。或是,亦可使接著劑(例如環氧樹脂系接著劑)置入應研削的晶棒2的端面之相反側端面(圖示實施形態中為第二面6)與卡盤台18的上表面之間,再將晶棒2固定於卡盤台18。接著,藉由旋轉手段使卡盤台18由俯視觀看的逆時針方向以預定旋轉速度(例如300rpm)旋轉。另外,藉由馬達使主軸22由俯視觀看的逆時針方向以預定旋轉速度(例如6000rpm)旋轉。接著,藉由研削裝置16之升降手段(無圖示)使主軸22下降,使研削磨粒30與應研削的晶棒2的端面接觸。使研削磨粒30與欲應研削的晶棒2的端面接觸之後,以預定研削進給速度(例如0.1μm/s)使主軸22下降。藉此,可使晶棒2之端面平坦化。
在實施端面平坦化步驟之後,實施剝離層形成步驟:形成使晶圓剝離的剝離層。剝離層形成步驟,可使用例如圖3所示其中一部分之雷射加工裝置32來加以實施。雷射加工裝置32具備:卡盤台34及聚光器36。將工件吸附於上表面之卡盤台34,係藉由旋轉手段以將在上下方向上延伸之軸線作為中心進行旋轉,並且藉由X方向移動手段於X方向前進後退,藉由Y方向移動手段於Y方向前進後退(未圖示)。聚光器36包含一聚光鏡(未圖示),用以將雷射加工裝置32之脈衝雷射光線震盪器所震盪出的脈衝雷射光線LB予以聚光來照射工件。此外,X方向係圖3中以箭頭X所示之方向,Y方向係圖3中以箭頭Y所示之方向,即正交於X方向之方向。X方向及Y方向所界定之平面係實質上是水平的。
參照圖3繼續說明,在剝離面形成步驟當中,首先,將晶棒2的平坦化端面(圖示實施形態中為第一面4)朝上,使晶棒2吸附於雷射加工裝置32之卡盤台34的上表面。或是,亦可使接著劑(例如環氧樹脂系接著劑)置入晶棒2的平坦化端面之相反側端面(圖示實施形態中為第二面6)與卡盤台34的上表面之間,再將晶棒2固定於卡盤台34。接著,由雷射加工裝置32的攝像手段(無圖示),自晶棒2的平坦化端面之上方對晶棒2進行攝像。接著,依據攝像手段所攝像之晶棒2的影像,藉由雷射加工裝置32之X方向移動手段、Y方向移動手段及旋轉手段使卡盤台34移動及旋轉,藉以將晶棒2之方位調整至預定方位,並且調整晶棒2與聚光器36在XY平面之位置。在將晶棒2之方位調整至預定方位之際,如圖3(a)所示,使第一定向平面12對準Y方向,並且使第二定向平面14對準X方向,藉此使形成偏角α的方向A對準Y方向,並且使形成偏角α的方向A之正交方向對準X方向。接著,藉由雷射加工裝置32之聚光點位置調整手段(無圖示)使聚光器36升降,如圖3(b)所示,使聚光點FP位於從晶棒2的平坦化端面起算相當於應製成之晶圓厚度(例如200μm左右)之深度位置。接著,使晶棒2與聚光點FP在對準形成偏角α的方向A之正交方向之X方向相對移動,將對單晶SiC具有穿透性之波長的脈衝雷射光線LB自聚光器36照射於晶棒2,以進行改質層形成加工。在本實施形態中如圖3所示,在改質層形成加工當中,在不移動聚光點FP之情況下藉由X方向移動手段使卡盤台34相對於聚光點FP以預定加工進給速度於X方向加工進給,同時將脈衝雷射光線LB自聚光器36朝晶棒2照射。
進行改質層形成加工時,如圖4所示,形成:直線狀改質層38及裂痕40,該直線狀改質層38係藉由脈衝雷射光線LB之照射使SiC分離成Si(矽)與C(碳),而下個照射的脈衝雷射光線LB被先前形成之C所吸収,並連鎖地使SiC分離成Si與C而形成直線狀改質層38,該裂痕40係自改質層38沿c面往改質層38兩側傳播之裂痕40。此外,在改質層形成加工當中,使晶棒2與聚光點FP相對的於X方向加工進給,來使改質層38的形成深度中相鄰之脈衝雷射光線LB的光點相互重疊,同時將脈衝雷射光線LB照射於晶棒2,再使脈衝雷射光線LB再次照射分離成Si與C之改質層38。要使相鄰的光點相互重疊,必須使由脈衝雷射光線LB之重複頻率F、晶棒2與聚光點FP之相對速度V以及光點之直徑D所界定之G=(V/F)-D為G<0。另外,相鄰光點之重複率係以|G|/D界定。
參照圖3及圖4繼續說明,在剝離層形成步驟當中,接著改質層形成加工之後,使晶棒2與聚光點FP相對的以預定分度進給量於對準形成偏角α的方向A之Y方向分度進給。在本實施形態中,在不移動聚光點FP之情況下藉由Y方向移動手段使卡盤台34相對於聚光點FP僅以預定分度進給量Li於Y方向分度進給。於是在剝離層形成步驟當中交互重複進行改質層形成加工與分度進給,如圖4所示,在從晶棒2的平坦化端面起算相當於應製成之晶圓厚度之深度處,可形成剝離層42,由多個改質層38及裂痕40所構成,用以將晶圓自晶棒2剝離。剝離層42當中,在形成偏角α的方向A中相鄰之改質層38彼此由裂痕40所相連結。這種剝離層形成步驟,可由例如以下的加工條件來實施。 脈衝雷射光線之波長: 1064nm 重複頻率 : 80kHz 平均輸出: 3.2W 脈衝寬度: 4ns 聚光點直徑: 3μm 聚光鏡的數值孔徑(NA): 0.43 分度進給量: 250~400μm 加工進給速度: 120~260mm/s
參照圖5進行說明。剝離層形成步驟實施之後,實施硬板(Hard Plate)配置步驟:將硬板44以接著劑配置在有剝離層42形成之晶棒2的平坦化端面(在本實施形態中第一面4)。硬板配置步驟中所使用之硬板44,可使用例如厚度5mm左右之圓盤狀玻璃板、陶瓷板、合成樹脂板(聚對苯二甲酸乙二酯(PET)或丙烯酸等),硬板44之材質可對應實施本硬板配置步驟之後所進行的各種步驟來做適當選擇。與晶棒2的平坦化端面接觸之硬板44的面,可與晶棒2的平坦化端面為相同形狀,或是比晶棒2的平坦化端面更大的形狀為較佳者。另外,硬板配置步驟中所使用之接著劑,可為氰基丙烯酸酯系接著劑(例如東亞合成股份有限公司的Aron Alpha(註冊商標))。
硬板配置步驟實施之後,實施剝離步驟:將晶圓與硬板44一同自晶棒2之剝離層42剝離。剝離步驟,可使用例如圖6(a)中所示一部分的剝離裝置46來實施。剝離裝置46具備卡盤台48及剝離手段50。卡盤台48係將工件吸附於上表面。剝離手段50包含實質上水平延伸之臂部52、附設於臂部52前端之馬達54。馬達54之下表面,與以朝上下方向延伸之軸線為中心可任意旋轉之圓盤狀吸附片56相連結。將工件吸附於下表面之吸附片56,內建有對吸附片56的下表面賦予超音波振動之超音波振動賦予手段(無圖示)。
參照圖6繼續說明,在剝離步驟當中,首先,將配置有硬板44的晶棒2端面側(圖示實施形態中為第一面4側)朝上,使晶棒2吸附於剝離裝置46之卡盤台48的上表面。或是,亦可使接著劑(例如環氧樹脂系接著劑)夾在配置有硬板44的晶棒2端面之相反側端面(在本實施形態中為第二面6)與卡盤台48的上表面之間,再將晶棒2固定於卡盤台48。接著,藉由剝離裝置46之升降手段(無圖示)使臂部52下降,如圖6(a)所示,使吸附片56之下表面吸附於硬板44之單面。接著,使超音波振動賦予手段作動,對吸附片56之下表面賦予超音波振動,並且使馬達54作動,使吸附片56旋轉。因此,可將晶圓58與硬板44一同自晶棒2之剝離層42剝離。圖6(b)表示:與硬板44一同自晶棒2之剝離層42剝離之晶圓58的剝離面58a朝上狀態的晶圓58之立體圖。
參照圖7進行說明。剝離步驟實施之後,實施剝離面平坦化步驟:使自晶棒2剝離之晶圓58的剝離面58a平坦化。可利用上述研削裝置16來實施之剝離面平坦化步驟,係在硬板44接著於晶圓58之狀態下實施。研削步驟當中,首先,將自晶棒2剝離之晶圓58的剝離面58a朝上(也就是硬板44側朝下),使晶圓58及硬板44吸附於研削裝置16之卡盤台18的上表面。或是,亦可使接著劑(例如環氧樹脂系接著劑)夾在硬板44的單面與卡盤台18之上表面之間,再將晶圓58及硬板44固定於卡盤台18。接著,藉由旋轉手段使卡盤台18由俯視觀看的逆時針方向以預定旋轉速度(例如300rpm)旋轉。另外,藉由馬達使主軸22由俯視觀看的逆時針方向以預定旋轉速度(例如6000rpm)旋轉。接著,藉由研削裝置16之升降手段(無圖示)使主軸22下降,使研削磨粒30與晶圓58的剝離面58a接觸。在使研削磨粒30與晶圓58的剝離面58a接觸之後,以預定研削進給速度(例如0.1μm/s)使主軸22下降。因此,可使自晶棒2剝離之晶圓58的剝離面58a平坦化。
參照圖8進行說明。剝離面平坦化步驟實施之後,實施元件形成步驟:在晶圓58的平坦化剝離面58a形成功率元件及LED等元件60。元件形成步驟係在硬板44接著於晶圓58之狀態下實施。圖示實施形態中如圖8所示,在晶圓58的平坦化剝離面58a形成的矩形狀元件60由格子狀分割預定線62所劃分。
參照圖9進行說明。在本實施形態中剝離面平坦化步驟實施之後,實施分割步驟:將晶圓58分割成各個元件60。可利用上述雷射加工裝置32來實施之分割步驟,係在硬板44接著於晶圓58之狀態下實施。在分割步驟當中,首先,將有元件60形成之晶圓58的剝離面58a朝上(也就是硬板44側朝下),使晶圓58及硬板44吸附於雷射加工裝置32之卡盤台34的上表面。或是,亦可使接著劑(例如環氧樹脂系接著劑)夾在硬板44的單面與卡盤台34的上表面之間,再將晶圓58及硬板44固定於卡盤台34。接著,由雷射加工裝置32的攝像手段,自上方對晶圓58進行攝像。接著,依據攝像手段所攝像之晶圓58的影像,藉由雷射加工裝置32之X方向移動手段、Y方向移動手段及旋轉手段使卡盤台34移動及旋轉,藉此使格子狀分割預定線62對準X方向及Y方向,並且使對準X方向之位置的分割預定線62之片端部位於聚光器36的正下方。接著,藉由雷射加工裝置32之聚光點位置調整手段使聚光器36升降,使聚光點FP位於晶圓58的分割預定線62。接著,使晶圓58與聚光點FP在X方向相對移動,將對單晶SiC具吸收性的脈衝雷射光線LB,自聚光器36照射於晶圓58的分割預定線62的片端部至他端部,以施行燒蝕加工等分割加工。 在本實施形態中的分割加工中,在不移動聚光點FP之情況下藉由X方向移動手段使卡盤台34相對於聚光點FP以預定加工進給速度於X方向加工進給,同時將脈衝雷射光線LB自聚光器36照射於晶圓58。接著,以分割預定線62的間隔量使晶圓58與聚光點FP相對的於Y方向分度進給。在本實施形態中,在不移動聚光點FP之情況下,藉由Y方向移動手段使卡盤台34相對於聚光點FP於Y方向分度進給分割預定線62的間隔量。於是燒蝕加工等分割加工與分度進給交互重複進行,藉此對所有對準X方向之分割預定線62施以分割加工。另外,藉由旋轉手段使卡盤台34進行90度旋轉,並且交互重複進行燒蝕加工等分割加工與分度進給,藉此對先前施有分割加工的分割預定線62之所有正交的分割預定線62亦施以分割加工。因此,可將晶圓58分割成各個元件60。晶圓58之沿分割預定線62施以分割加工而成格子狀之部分(加工線)以符號64表示。
參照圖10進行說明。在本實施形態中分割步驟實施之後,實施拾取步驟:拾取各個元件60。在拾取步驟當中,例如,使硬板44側朝下,將晶圓58及硬板44搭載於加熱片(無圖示)來予以加熱。因此,夾在晶圓58與硬板44之間的接著劑會溶解使接著力降低,所以可藉由適當的拾取手段(無圖示)自硬板44拾取各個元件60。
如上所述,本發明之晶圓製成方法中,晶圓58由硬板44所補強,所以在將晶圓58自晶棒2剝離之際或在晶圓58的表面形成元件60之際等情況下,無須為了防止晶圓58損傷,而使晶圓58的厚度為相對較厚的700~800μm左右來保有晶圓58的強度;即使晶圓58的厚度為相對較薄的200μm左右,也可在將晶圓58從晶棒2剝離之際、或在晶圓58的表面形成元件60之際等情況下,防止晶圓58之損傷。從而,在本發明的晶圓之製成方法當中,可使從晶棒2剝離之晶圓58的厚度為相對較薄的200μm左右,所以為了加強散熱性而使晶圓58進行薄化之際要所研削的(拋棄)量得以減少,而且可從晶棒2製成的晶圓數量得以增加,可更經濟地從晶棒2製成晶圓58。
此外,在本實施形態中,在剝離層形成步驟之改質層形成加工中,使晶棒2與聚光點FP於偏角α的形成方向A之正交方向相對移動,且在剝離層形成步驟之分度進給中,使晶棒2與聚光點FP於形成偏角α的方向A相對移動,雖說明了此例,但剝離層形成步驟之改質層形成加工當中晶棒2與聚光點FP之相對的移動方向亦可為非偏角α的形成方向A之正交方向,且剝離層形成步驟之分度進給當中晶棒2與聚光點FP之相對的移動方向亦可為非偏角α的形成方向A。另外,在本實施形態中,c軸相對於第一面4之垂直線10傾斜而c面與第一面4形成偏角α一例的晶棒2已有說明,但c軸相對於第一面的垂直線不傾斜,c面與第一面之偏角為0度(即第一面的垂直線與c軸一致)之單晶SiC晶棒的情況下,亦可實施本發明之晶圓製成方法。
2‧‧‧單晶SiC晶棒4‧‧‧第一面(端面)6‧‧‧第二面38‧‧‧改質層40‧‧‧裂痕42‧‧‧剝離層44‧‧‧硬板58‧‧‧晶圓58a‧‧‧剝離面60‧‧‧元件α‧‧‧偏角A‧‧‧形成偏角的方向FP‧‧‧聚光點LB‧‧‧脈衝雷射光線
圖1係單晶SiC晶棒之前視圖(a)、俯視圖(b)及立體圖(c)。 圖2係表示端面平坦化步驟的實施狀態之立體圖。 圖3係表示剝離層形成步驟的實施狀態之立體圖(a)及前視圖(b)。 圖4係形成有剝離層之單晶SiC晶棒的俯視圖(a)、B-B線剖面圖(b)及D部位放大圖(c)。 圖5係表示硬板配置步驟的實施狀態之立體圖。 圖6係表示剝離步驟的實施狀態之立體圖(a),及與硬板一同剝離之晶圓的立體圖(b)。 圖7係表示剝離面平坦化步驟的實施狀態之立體圖。 圖8係形成有元件之晶圓的立體圖。 圖9係表示分割步驟的實施狀態之立體圖。 圖10係分割成各個元件的晶圓之立體圖。
2‧‧‧單晶SiC晶棒
4‧‧‧第一面(端面)
6‧‧‧第二面
12‧‧‧第一定向平面
14‧‧‧第二定向平面
42‧‧‧剝離層
44‧‧‧硬板
46‧‧‧剝離裝置
48‧‧‧卡盤台
50‧‧‧剝離手段
52‧‧‧臂部
54‧‧‧馬達
56‧‧‧吸附片
58‧‧‧晶圓
58a‧‧‧剝離面
Claims (2)
- 一種SiC晶圓之製成方法,係自單晶SiC晶棒製成SiC晶圓,其包括以下步驟: 端面平坦化步驟,使單晶SiC晶棒之端面平坦化; 剝離層形成步驟,在該端面平坦化步驟實施之後,使對單晶SiC具有穿透性之波長的雷射光線之聚光點定位於從單晶SiC晶棒的端面起算相當於應製成之SiC晶圓厚度之深度處,將雷射光線照射於單晶SiC晶棒,形成使SiC晶圓剝離之剝離層; 硬板配置步驟,將硬板以接著劑配置於形成有剝離層之單晶SiC晶棒的端面; 剝離步驟,在該硬板配置步驟實施後,將SiC晶圓與該硬板一同自單晶SiC晶棒之剝離層剝離; 剝離面平坦化步驟,使自單晶SiC晶棒剝離之SiC晶圓的剝離面平坦化;及 元件形成步驟,於平坦化的剝離面形成元件。
- 如申請專利範圍第1項所述之SiC晶圓製成方法,其中, 單晶SiC晶棒具有:第一面;第二面,在該第一面相反側;c軸,自該第一面至該第二面相對於該第一面之垂直線傾斜;及c面,正交於該c軸,而該c面與該第一面形成偏角; 在該剝離層形成步驟中, 使對單晶SiC具有穿透性之波長的雷射光線之聚光點定位於從該第一面起算相當於SiC晶圓厚度之深度處,並且使單晶SiC晶棒與該聚光點在和形成該偏角的第2方向正交之第1方向上相對移動,使SiC分離成Si與C,且下個照射的雷射光線被先前形成之C所吸収,並連鎖地使SiC分離成Si與C而形成直線狀改質層及裂痕,並使單晶SiC晶棒與該聚光點在形成該偏角的方向上相對移動,而進行預定量的分度進給並形成剝離層。
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