TW202006806A - 半導體裝置製造方法 - Google Patents
半導體裝置製造方法 Download PDFInfo
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- TW202006806A TW202006806A TW108118401A TW108118401A TW202006806A TW 202006806 A TW202006806 A TW 202006806A TW 108118401 A TW108118401 A TW 108118401A TW 108118401 A TW108118401 A TW 108118401A TW 202006806 A TW202006806 A TW 202006806A
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- wafer
- semiconductor device
- adhesive layer
- manufacturing
- cleaning process
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Images
Classifications
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- 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
- H01L21/768—Applying interconnections to be used for carrying current between separate components within a device comprising conductors and dielectrics
- H01L21/76898—Applying interconnections to be used for carrying current between separate components within a device comprising conductors and dielectrics formed through a semiconductor substrate
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J183/00—Adhesives based on macromolecular compounds obtained by reactions forming in the main chain of the macromolecule a linkage containing silicon, with or without sulfur, nitrogen, oxygen, or carbon only; Adhesives based on derivatives of such polymers
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- H01L21/18—Manufacture or treatment of semiconductor devices or of parts thereof the devices having potential barriers, e.g. a PN junction, depletion layer or carrier concentration layer the devices having semiconductor bodies comprising elements of Group IV of the Periodic Table or AIIIBV compounds with or without impurities, e.g. doping materials
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Abstract
本發明係提供一種半導體裝置製造方法,該半導體裝置製造方法適於在隔著接著劑層接合而多層化之半導體元件間實現較低的配線電阻。本發明之方法如下。首先,準備晶圓積層體W,該晶圓積層體W係包含:具有電路形成面10a之晶圓10、具有主面20a及背面20b之晶圓20、及含有SiOC系聚合物之接著劑層30。其次,在晶圓積層體W,藉由隔著遮蔽晶圓20主面20a側的一部分的遮蔽圖案(mask pattern)而從晶圓20側進行的蝕刻處理,形成孔洞H,該孔洞H係貫通晶圓20與接著劑層30,且到達晶圓10之配線圖案12b。然後,在孔洞H之內面形成絕緣膜41。其次,將孔洞H之底面上的絕緣膜41除去。繼而,將晶圓積層體W附諸洗淨處理(氧電漿處理及/或Ar濺鍍處理)。然後,在孔洞H形成導電部。
Description
本發明係關於具有包含複數個半導體元件之積層構造的半導體裝置之製造方法。本案係主張在2018年5月28日於日本提出申請之日本特願2018-101929號的優先權,並在此援引其內容。
近年來,以半導體裝置之更高密度化作為主要目的,正在進行用以製造具有複數個半導體晶片乃至半導體元件於其厚度方向集成之立體構造的半導體裝置之技術的開發。如此之技術之一已知有所謂的WOW(Wafer on Wafer,晶圓堆疊)製程。在WOW製程,係依序積層分別作成內嵌有複數個半導體元件之預定數目的半導體晶圓,形成在厚度方向多段地配置多段半導體元件之構造,該晶圓積層體係經過切割(dicing)步驟而單件化成半導體裝置。如此之WOW製程的相關技術,係例如記載於下述之專利文獻1、專利文獻2。
[專利文獻1]日本特開2016-4835號
[專利文獻2]日本特開2016-178162號
在WOW製程中係形成貫通晶圓之貫通孔(via hole)(亦即,貫通電極),該貫通孔係用以使晶圓積層體中形成於不同晶圓的半導體元件之間能夠電性連接。貫通電極係能例如經由下述步驟而形成:在晶圓內藉由反應性離子蝕刻而形成貫通晶圓的厚度方向之孔洞之步驟、或於孔洞內填充導電材料之步驟。
另一方面,為經多層化之晶圓彼此間之接合考慮到利用接著劑。繼而,為了於晶圓上隔著接著劑層而積層之上段晶圓形成與下段晶圓之半導體元件導通的貫通電極,在孔洞形成步驟中,必須以貫通上段晶圓與其正下方所連的接著劑層之方式,藉由反應性離子蝕刻來形成孔洞。並於如此之孔洞中填充導電材料。
然而,若經過對接著劑層進行之反應性離子蝕刻,所形成之孔洞內容易產生蝕刻殘渣。於晶圓接合利用接著劑時,就習知形式之WOW製程而言,會有該蝕刻殘渣導致欲藉由貫通電極而電性連接之半導體元件間的配線電阻之高電阻化之情形。
本發明是在如以上所述情事下所想出者,其目的在於提供一種半導體裝置製造方法,該半導體裝置製造方法係適於在經由隔著接著 劑層之半導體晶圓的積層而使半導體元件多層化之半導體裝置製造方法中,在經多層化之半導體元件間實現低的配線電阻之手法。
由本發明所提供之半導體裝置製造方法,係經由隔著接著劑層之半導體晶圓的積層而使半導體元件多層化之方法,且至少包含下述之第1步驟至第6步驟。
在第1步驟中,係準備晶圓積層體。該晶圓積層體具有積層構造,該積層構造係包含:第1晶圓,係具有包含配線圖案之電路形成面及與該電路形成面為相反之背面;第2晶圓,係具有主面及與該主面為相反之背面;及接著劑層,係含有SiOC系聚合物且間隔存在於第1晶圓之電路形成面與第2晶圓之背面之間。所謂的SiOC系聚合物係構成元素中至少包含矽、氧及碳之聚合物,且亦包括更含有氫之SiOCH系聚合物。SiOC系聚合物中,碳比例係例如20至70質量%,氫比例係例如2至20質量%,氧比例係例如10至40質量%,及矽比例係例如3至40質量%。所謂的電路形成面,係指在晶圓中內嵌半導體元件,且在該元件上形成所謂之再配線層的側之面。所謂的主面係指設為在晶圓中作成內嵌半導體元件之側的面者。
在第2步驟,於晶圓積層體中,係藉由隔著遮蔽第2晶圓之主面側的一部分之遮蔽圖案(mask pattern)而從該第2晶圓側開始之蝕刻處理,而形成貫通該第2晶圓及接著劑層且到達第1晶圓之配線圖案的孔洞。就蝕刻處理而言,較佳係進行反應性離子蝕刻。又,在配線圖案中面對孔洞之部分則構成孔洞之底面。
第3步驟中,係在包括孔洞之壁面及底面的內面形成絕緣膜。第4步驟中,係將孔洞內之絕緣膜中於配線圖案上之部分(亦即,在絕緣膜中位於孔洞底面上之部分)進行蝕刻除去。
第5步驟中,係將形成有孔洞之晶圓積層體付諸洗淨處理。此洗淨處理係包含氧電漿洗淨處理及/或氬濺鍍洗淨處理。
在第6步驟中,係藉由在經洗淨步驟之孔洞內填充導電材料而形成導電部。所形成之導電部對於第1晶圓之電路形成面的配線圖案為構造性連接且電性連接。此導電部在所製造之半導體裝置中,係成為構成用以使源自第1晶圓之半導體元件與源自第2晶圓之半導體元件之間電性連接的貫通電極。較佳係在第6步驟之前,於孔洞壁面上形成阻隔層。又,第6步驟中之導電材料填充方法較佳為電鍍法。
本發明之半導體裝置製造方法係如上述,會成為用以使半導體元件間電性連接之貫通電極的導電部,對於第1晶圓之電路形成面的配線圖案為構造性連接且電性連接。如此之無凸塊(bumpless)構造就在經多層化之半導體元件間實現短的導電路徑而言為適宜。習知形式之WOW製程中,係有著在與貫通晶圓之貫通電極為電性連接的凸塊電極形成於該晶圓表面之前提下,隔著該凸塊電極而謀求在不同晶圓之半導體元件間的電性連接之情形。相對於此,在本發明之半導體裝置製造方法中,則是會成為貫通電極之導電部直接地連接第1晶圓之配線圖案,而形成在不同晶圓的半導體元件間之電性連接之無凸塊構造。如此之無凸塊構造係如上述般,就在多層化之半導體元件間實現短的導電路徑而言為適宜。多層化之 半導體元件間的導電路徑愈短,則該元件間之導電路徑乃至配線之電阻有變得愈小之傾向。
此外,本發明之半導體裝置製造方法係如上述,屬於經由隔著接著劑層之半導體晶圓的積層而使半導體元件多層化之方法,而且接合晶圓間之接著劑層含有SiOC系聚合物。而且,在本方法中形成有貫通晶圓及接著劑層之孔洞的晶圓積層體,係在第5步驟中付諸包含氧電漿洗淨處理及/或氬濺鍍洗淨處理之洗淨處理。本發明之見識為:此等構成就在形成於孔洞內之導電部乃至貫通電極、與第1晶圓電路形成面之配線圖案之間能實現低的接觸電阻而言為適宜。例如依後述之實施例及比較例所示。孔洞內之導電部乃至貫通電極與第1晶圓電路形成面之配線圖案之間的接觸電阻愈小,則在所製造之半導體裝置中,隔著該貫通電極而電性連接之半導體元件間的導電路徑整體乃至配線整體之電阻即有變小之傾向。
如以上所述,本半導體裝置製造方法係適於在隔著接著劑層而接合並多層化之半導體元件之間實現低的配線電阻。如此之本半導體裝置製造方法在所製造之半導體裝置中,係適於抑制低消耗電力下之高速訊號傳遞,而且適於抑制高頻訊號之衰減。
本半導體裝置製造方法之第5步驟中,進行氧電漿洗淨處理時,其處理時間較佳係5至120秒,更佳係10至60秒,再更佳係15至40秒。進行氬濺鍍洗淨處理時,其處理時間較佳係0.5至5分鐘,更佳係2至4分鐘。又,第5步驟之洗淨處理較佳係包含氧電漿洗淨處理及在氧電漿洗淨處理後之氬濺鍍洗淨處理。此種情況下,該洗淨處理較佳係包含於此等處理之間的硫酸洗淨處理。此等構成就在形成於孔洞內之導電 部乃至貫通電極、與第1晶圓電路形成面之配線圖案之間能實現低的接觸電阻而言,係為較佳。
接著劑層較佳係包含矽氧烷系有機無機混成接著劑,更佳係包含含有聚合性官能基之聚有機倍半矽氧烷(含有聚合性基的聚有機倍半矽氧烷)之接著劑組成物的硬化物。所謂的矽氧烷系有機無機混成接著劑係指包含具有矽氧烷鍵且構成該矽氧烷鍵之矽係與有機基鍵結的構造單元之接著性高分子材料。如此之接著劑層係實現高的耐熱性,同時適於謀求用以形成接著劑層之硬化溫度的降低而抑制對作為被著體之晶圓內的元件之損傷。
接著劑層之厚度較佳係5μm以下。如此之構成係適於謀求在本方法中所形成之導電部乃至貫通電極的縮短化,因此適於減少隔著該貫通電極而電性連接之半導體元件間的導電路徑整體乃至配線整體之電阻。又,含有矽氧烷系有機無機混成接著劑之接著劑層係即使在薄至5μm以下之程度的情形下,亦適於充分地發揮之晶圓接合強度。
第2晶圓之厚度較佳係20μm以下,更佳係15μm以下。如此之構成係適於謀求在本方法所形成之導電部乃至貫通電極之縮短化,因此,適於減少隔著該貫通電極而電性連接之半導體元件間的導電路徑整體乃至配線整體之電阻。
10、20‧‧‧晶圓
10a‧‧‧電路形成面
10b‧‧‧背面
11‧‧‧本體部
12‧‧‧再配線層
12a‧‧‧絕緣部
12b‧‧‧配線圖案
20a‧‧‧主面
20b‧‧‧背面
21‧‧‧絕緣膜
30‧‧‧接著劑層
41‧‧‧絕緣膜
50‧‧‧導電材料
51‧‧‧導電部
H‧‧‧孔洞
W‧‧‧晶圓積層體
第1圖係表示本發明之一實施形態的半導體裝置製造方法中之一部分的步驟。
第2圖係表示本發明之一實施形態的半導體裝置製造方法中之一部分的步驟。
第3圖係表示本發明之一實施形態的半導體裝置製造方法中之一部分的步驟。
第4圖係表示實施例1及比較例1之各鏈電阻(chain resistance)測定結果之圖表。
第5圖係表示實施例2及比較例1之各鏈電阻測定結果之圖表。
第6圖係表示實施例1、3及比較例1之各鏈電阻測定結果之圖表。
第7圖係表示實施例3、4及比較例1之各鏈電阻測定結果之圖表。
第1圖至第3圖係表示本發明之一實施形態的半導體裝置製造方法。此製造方法係用以製造具有半導體元件於其厚度方向集成之立體構造的半導體裝置之方法,第1圖至第3圖係以局部剖面圖表示製造過程者。
在本半導體裝置製造方法中,係首先準備如第1(a)圖之晶圓積層體W(準備步驟)。此晶圓積層體W係具有積層構造,該積層構造包含:晶圓10、晶圓20、及此等之間的接著劑層30。
晶圓10係經過電晶體形成步驟及再配線層形成步驟之晶圓,且具備本體部11及再配線層12,具有再配線層12側之電路形成面 10a及與電路形成面10a為相反之背面10b。在晶圓10之本體部11的單面側係作成內嵌複數個半導體元件(省略圖示),且於該元件上形成再配線層12。再配線層12係具有絕緣部12a及配線圖案12b。電路形成面10a係在晶圓10中形成如此之再配線層12之側的面。再配線層12之配線圖案12b係在電路形成面10a具有面對再配線層12外之部分。亦即,在電路形成面10a係含有配線圖案12b露出區域。如此之晶圓10的厚度例如為300至800μm。晶圓10亦可在之後藉由從背面10b側開始之磨削加工而薄化。
晶圓20為經電晶體形成步驟之晶圓,係具有主面20a及與主面20a相反之背面20b。晶圓20之主面20a係晶圓20中作成內嵌複數個半導體元件(省略圖示)之側的面。晶圓20之厚度在本實施形態為30μm以下,較佳係20μm以下,更佳係15μm以下。
用以構成此等晶圓10、20之本體部的半導體材料可舉出例如:矽(Si)、鍺(Ge)、碳化矽(SiC)、砷化鎵(GaAs)、氮化鎵(GaN)及磷化銦(InP)。
接著劑層30係含有SiOC系聚合物,且間隔存在於晶圓10之電路形成面10a與晶圓20之背面20b之間。所謂SiOC系聚合物係在構成元素中至少含有矽、氧及碳之聚合物,且包括更含有氫之SiOCH系聚合物。SiOC系聚合物中,碳比例係例如為20至70質量%,氫比例係例如為2至20質量%,氧比例係例如為10至40質量%及矽比例係例如為3至40質量%。
接著劑層30較佳係含有矽氧烷系有機無機混成接著劑,更佳係含有包含聚合性基之倍半矽氧烷的接著劑組成物之硬化物。所謂矽氧烷系有機無機混成接著劑,係指包含具有矽氧烷鍵且於構成該矽氧烷鍵之矽上鍵結有機基之構造單元的接著性高分子材料。
第1(a)圖所示之晶圓積層體W例如可經由如下述之步驟而製作。首先,將經電晶體形成步驟及再配線層形成步驟之上述晶圓10之電路形成面10a側、與會成為上述之晶圓20的晶圓(追加晶圓)隔著接著劑層30而接合。其次,對追加晶圓中與晶圓10接合面為相反側之面使用磨削裝置進行磨削加工,將追加晶圓薄化至預定之厚度為止。然後,在經薄化之追加晶圓的露出面(與晶圓10接合面為相反側之面)中經由電晶體形成步驟等而形成半導體元件。例如以如上述之方式,可製作上述晶圓積層體W,係具有包含晶圓10、20及接合此等之接著劑層30的積層構造。
用以形成上述接著劑層30之組成物,係含有會成為上述SiOC系聚合物之SiOC系材料來作為硬化性樹脂。如此之構成就實現接著劑層30之高耐熱性而言為較佳。該SiOC系材料較佳為矽氧烷系有機無機混成接著劑。矽氧烷系有機無機混成接著劑之主劑係可舉出例如:含有聚合性基的聚有機倍半矽氧烷、及苯并環丁烯(BCB)樹脂。含有聚合性基的聚有機倍半矽氧烷所具有之聚合性官能基較佳為環氧基或(甲基)丙烯醯氧基。BCB樹脂可舉出例如:1,3-二乙烯基-1,1,3,3-四甲基二矽氧烷-苯并環丁烯。BCB樹脂之市售品係可使用Dow Chemical公司製之「CYCLOTEN」。
本實施形態中,當接著劑層30形成用組成物係含有含聚合性基之聚有機倍半矽氧烷時,同組成物中之含有聚合性基的聚有機倍半矽氧烷之含有比例係例如70質量%以上,較佳係80至99.8質量%,更佳係90至99.5質量%。
於接著劑層30形成用組成物含有含聚合性基之聚有機倍半矽氧烷時,該含聚合性基之聚有機倍半矽氧烷在本實施形態中,矽氧烷構成單元係包含:至少含有下述之式(1)所示之構成單元的第1構成單元[RSiO3/2]、及至少含有下述之下述的式(2)所示之構成單元的第2構成單元[RSiO2/2(OR')](第2構成單元中之R與R'可為相同,亦可為相異)。此等構成單元係屬於矽氧烷構成單元中之所謂的T單元,在本實施形態中,係將構成單元[RSiO3/2]設為T3體,將構成單元[RSiO2/2(OR')]設為T2體。在T3體中,其矽原子係分別與其它矽氧烷構成單元中的矽原子所鍵結之三個氧原子鍵結。在T2體中,其矽原子係分別與其它矽氧烷構成單元中的矽原子所鍵結之二個氧原子鍵結,且與烷氧基之氧鍵結。如此之T3體及T2體皆如上述般屬於矽氧烷構成單元之T單元,且能夠藉由具有水解性之三個官能基的矽烷化合物之水解與水解後之縮合反應而形成,為含有聚合性基之聚有機倍半矽氧烷的部分構造。
[R1SiO3/2] (1)
[R1SiO2/2(OR2)] (2)
式(1)中之R1及式(2)中之R1分別表示含有環氧基或(甲基)丙烯醯氧基之基。式(2)中之R2係表示氫原子或碳數1至4之烷基。
式(1)及式(2)中之各R1為含有環氧基的基時,其R1可舉出例如下述之式(3)至(6)所示之基。式(3)至(6)中之R3、R4、R5、R6分別表示碳數為例如1至10之直鏈狀或分枝鏈狀的伸烷基。如此之伸烷基係可舉出例如:亞甲基、甲基亞甲基、二甲基亞甲基、伸乙基、伸丙基、三亞甲基、四亞甲基、五亞甲基、六亞甲基及十亞甲基。從所形成之接著劑層30之高耐熱性的實現和硬化時抑制收縮的觀點來看,式(1)中之R1及式(2)中之含有環氧基的基之R1分別係以式(3)所示之含有環氧基的基或式(4)所示之含有環氧基的基為較佳,以式(3)所示之基且R3為伸乙基之2-(3,4-環氧基環己基)乙基為更佳。
上述式(2)中之R2係如上述,表示氫原子或碳數1至4之烷基,因此,式(2)中之OR2係表示羥基或碳數1至4之烷氧基。碳數1至4之烷氧基可舉出例如:甲氧基、乙氧基、丙氧基、異丙氧基、丁氧基及異丁氧基。
接著劑層30形成用組成物所包含的含有聚合性基之聚有機倍半矽氧烷就上述式(1)所示之構成單元而言,係可為包含一種者,亦可為包含二種以上者。該含有聚合性基之聚有機倍半矽氧烷就上述式(2)所示之構成單元而言,係可為包含一種者,亦可為包含二種以上者。
接著劑層30形成用組成物所含之上述含有聚合性基的聚有機倍半矽氧烷就上述之T3體而言,除了包含式(1)所示之構成單元以外,亦可包含下述式(7)所示之構成單元。式(7)中之R7表示氫原子、取代或無取代之烷基、取代或無取代之烯基、取代或無取代之環烷基、取代或無取代之芳基、或是取代或無取代之芳烷基。式(7)中之R7較佳係取代或無取代之烷基、取代或無取代之烯基、或是取代或無取代之芳基,更佳係苯基。
[R7SiO3/2] (7)
關於R7的上述之烷基可舉出例如:甲基、乙基、丙基、正丁基、異丙基、異丁基、第二丁基、第三丁基及異戊基。關於R7的上述之烯基可舉出例如:乙烯基、烯丙基及異丙烯。關於R7的上述之環烷基可舉出例如:環丁基、環戊基及環己基。關於R7的上述之芳基可舉出例 如:苯基、甲苯基及萘基。關於R7的上述之芳烷基可舉出例如:苯甲基及苯乙基。
關於R7的上述之烷基、烯基、環烷基、芳基及芳烷基之取代基可舉出例如:醚基、酯基、羰基、矽氧烷基、氟原子等鹵素原子、丙烯酸基、甲基丙烯酸基、巰基、胺基及羥基。
接著劑層30形成用組成物所含之上述含有聚合性基之聚有機倍半矽氧烷就上述之T2體而言,除了含有式(2)所示之構成單元以外,亦可含有下述式(8)所示之構成單元。式(8)中之R7係表示氫原子、取代或無取代之烷基、取代或無取代之烯基、取代或無取代之環烷基、取代或無取代之芳基、或取代或無取代之芳烷基,具體而言,與上述式(7)中之R7為相同。式(8)中之R2係表示氫原子或碳數1至4之烷基,具體而言,與上述式(2)中之R2為相同。
[R7SiO2/2(OR2)] (8)
含有聚合性基之聚有機倍半矽氧烷在其矽氧烷構成單元中,除了含有作為T單元之上述第1及第2構成單元以外,亦可含有選自由所謂M單元之構成單元[RSiO1/2]、所謂D單元之構成單元[R2SiO2/2]及所謂Q單元之構成單元[SiO4/2]所組成群組中的至少一種。
含有聚合性基之聚有機倍半矽氧烷可具有籠型、不完全籠型、梯型、無規型之任一種倍半矽氧烷構造,亦可具有此等倍半矽氧烷構造之2種以上所組合成的構造。
接著劑層30形成用組成物中之含有聚合性基的聚有機倍半矽氧烷之全部矽氧烷構成單元中,T3體相對於T2體之莫耳比的值(亦即,T3體/T2體)例如為5至500,下限值較佳係10。上限值較佳係100,更佳係50。藉由將[T3體/T2體]之值調整為如此之範圍,與接著劑層30形成用組成物所含之含有聚合性基的聚有機倍半矽氧烷以外之成分的相溶性會提高,且處理性會提高。含有聚合性基之聚有機倍半矽氧烷的[T3體/T2體]之值為5至500,意指相對於T3體的T2體之存在量係相對較少,矽烷醇之水解/縮合反應會進一步進行。
含有聚合性基之聚有機倍半矽氧烷中之上述莫耳比的值(T3體/T2體)係例如可藉由29Si-NMR頻譜測定而求取。29Si-NMR頻譜中,上述第1構成單元(T3體)中之矽原子、及上述第2構成單元(T2體)中之矽原子係表示相異之化學位移(chemical shift)的譜峰乃至訊號。從此等譜峰之面積比可求出上述莫耳比之值。含有聚合性基之聚有機倍半矽氧烷的29Si-NMR頻譜例如可藉由下述之裝置及條件進行測定。
測定裝置:商品名「JNM-ECA500NMR」(日本電子股份有限公司製)
溶劑:重氯仿
累計次數:1800次
測定溫度:25℃
在接著劑層30形成用組成物所含之含有聚合性基的聚有機倍半矽氧烷之數量平均分子量(Mn)較佳係1000至50000,更佳係1500至10000,再更佳係2000至8000,特佳係2000至7000。藉由使數量平 均分子量為1000以上,所形成之硬化物的絕緣性、耐熱性、抗破裂性、接著性會提升。另一方面,藉由將數量平均分子量設為50000以下,與同組成物中之其它成分之相溶性會提高,而硬化物之絕緣性、耐熱性、抗破裂性會提升。
有關接著劑層30形成用組成物所含之含有聚合性基的聚有機倍半矽氧烷之分子量分散度(Mw/Mn),較佳係1.0至4.0,更佳係1.1至3.0,再更佳係1.2至2.7。藉由將分子量分散度設為4.0以下,所形成之硬化物的耐熱性、抗破裂性或接著性會變得更高。另一方面,藉由將分子量分散度設為1.0以上,而有相同的組成物容易變為液狀,且其處理性會提高之傾向。
含有聚合性基之聚有機倍半矽氧烷的數量平均分子量(Mn)及重量平均分子量(Mw)係藉由凝膠滲透層析法(GPC)進行測定而以聚苯乙烯換算所算出之值。含有聚合性基之聚有機倍半矽氧烷的數量平均分子量(Mn)及重量平均分子量(Mw)係例如可使用HPLC裝置(商品名「LC-20AD」,島津製作所股份有限公司製)而以下述條件進行測定。
管柱:將2根Shodex KF-801(上游側,昭和電工股份有限公司製)、Shodex KF-802(昭和電工股份有限公司製)及Shodex KF-803(下游側,昭和電工股份有限公司製)串聯連接
測定溫度:40℃
溶析液:四氫呋喃(THF)
試料濃度:0.1至0.2質量%
流量:1mL/分
標準試料:聚苯乙烯
檢測器:UV-VIS檢測器(商品名「SPD-20A」,島津製作所股份有限公司製)
如以上之含有聚合性基的聚有機倍半矽氧烷,係可藉由水解性之具有三個官能基的矽烷化合物之水解及接續水解之縮合反應而製造。使用於該製造之原料係至少包含下述之式(9)所示之化合物,並依需要而包含下述之式(10)所示之化合物。式(9)所示之化合物係用以形成上述式(1)所示之構成單元與上述式(2)所示之構成單元者。式(10)所示之化合物係用以形成上述式(7)所示之構成單元與上述式(8)所示之構成單元者。
R1SiX1 3 (9)
R7SiX2 3 (10)
式(9)中之R1係表示含有聚合性基之基,具體而言,係與上述式(1)、式(2)中之R1相同。式(9)中之X1係表示烷氧基或鹵素原子。該烷氧基可舉出例如:甲氧基、乙氧基、丙氧基、異丙氧基、丁氧基、異丁氧基等碳數1至4之烷氧基。X1之鹵素原子可舉出例如:氟原子、氯原子、溴原子及碘原子。X1較佳係烷氧基,更佳係甲氧基或乙氧基。在式(9)中,三個X1可互為相同,亦可為相異。
式(10)中之R7表示取代或無取代之芳基、取代或無取代之芳烷基、取代或無取代之環烷基、取代或無取代之烷基、或是取代或無取代之烯基,具體而言,係與上述式(7)、式(8)中之R7相同。式(10)中之X2表示烷氧基或鹵素原子,具體而言,係與上述式(9)中之X1相同。
使用於上述含有聚合性基的聚有機倍半矽氧烷之製造的原料係亦可更含有其它水解性矽烷化合物。如此之化合物可舉出例如:上述式(9)、式(10)所示之兩種化合物以外的水解性三官能矽烷化合物、會形成M單元之水解性單官能矽烷化合物、會形成D單元之水解性二官能矽烷化合物、及形成Q單元之水解性四官能矽烷化合物。
作為上述原料之水解性矽烷化合物的使用量和組成係可因應製造目的物之含有聚合性基的聚有機倍半矽氧烷的構造而適當地調整。例如相對於使用之水解性矽烷化合物總量,上述式(9)所示之化合物的使用量係例如為55至100莫耳%,較佳係65至100莫耳%。相對於使用之水解性矽烷化合物總量,上述式(10)所示之化合物的使用量係例如為0至70莫耳%。相對於使用之水解性矽烷化合物總量,式(9)所示之化合物與式(10)所示之化合物的總使用量係例如為60至100莫耳%,較佳係70至100莫耳%,更佳係80至100莫耳%。
上述之含有聚合性基的聚有機倍半矽氧烷之製造中,在使用二種以上之水解性矽烷化合物的情況下,每種水解性矽烷化合物的水解及縮合反應係可為同時進行,亦可為依序進行。
上述之水解及縮合反應較佳係能夠在一種或二種以上之溶劑的存在下進行。較佳之溶劑可舉出例如:二乙基醚、二甲氧基乙烷、四氫呋喃、二烷等醚;及丙酮、甲基乙酮、甲基異丁基酮等酮。溶劑之使用量係在每100質量份水解性矽烷化合物為例如2000質量份以下之範圍內依照反應時間等而適當地調整。
上述之水解及縮合反應較佳係在一種或二種以上之觸媒及水的存在下進行。觸媒可為酸觸媒,亦可為鹼觸媒。觸媒之使用量係在每1莫耳水解性矽烷化合物為例如0.002至0.2莫耳之範圍內適當地調整。水之使用量係在每1莫耳水解性矽烷化合物為例如0.5至20莫耳之範圍內適當地調整。
上述水解性矽烷化合物之水解及縮合反應係可以1個階段進行,亦可分成2個以上的階段來進行。製造上述莫耳比之值(T3體/T2體)為5以上之含有聚合性基的聚有機倍半矽氧烷時,例如第1階段之水解及縮合反應的反應溫度係例如為40至100℃,較佳為45至80℃。第1階段之水解及縮合反應的反應時間係例如為0.1至10小時,較佳為1.5至8小時。第2階段之水解及縮合反應的反應溫度較佳為5至200℃,更佳為30至100℃。藉由將反應溫度控制於上述範圍,有可以將上述莫耳比之值(T3體/T2體)及上述數量平均分子量更有效率地控制於所希望之範圍的傾向。又,第2階段之水解及縮合反應的反應時間並無特別限定,但較佳為0.5至1000小時,更佳為1至500小時。又,上述之水解及縮合反應係可在常壓下、加壓下、或減壓下進行。上述之水解及縮合反應較佳為在氮或氬等非活性氣體之環境下進行。
藉由如以上之水解性矽烷化合物的水解及縮合反應,可獲得上述之含有聚合性基的聚有機倍半矽氧烷。反應完成後,較佳為進行用以抑制聚合性基之開環的觸媒之中和。以如此方式所得之含有聚合性基的聚有機倍半矽氧烷能夠視需要而精製。
接著劑層30形成用組成物係例如除了包含由以上方式所製造的含有聚合性基的聚有機倍半矽氧烷以外,以還包含至少一種之硬化觸媒為較佳。
接著劑層30形成用組成物包含含有環氧基之聚有機倍半矽氧烷時,硬化觸媒可舉出例如:熱陽離子聚合起始劑。接著劑層30形成用組成物包含含有(甲基)丙烯醯氧基之聚有機倍半矽氧烷時,硬化觸媒可舉出例如:熱自由基聚合起始劑。接著劑層30形成用組成物中之硬化觸媒的含量,以每100質量份含有聚合性基之聚有機倍半矽氧烷係0.1至3.0質量份為較佳。
上述之熱陽離子聚合起始劑可舉出例如:芳基鋶鹽、鋁螯合物、三氟化硼胺錯合物等型式的熱陽離子聚合起始劑。芳基鋶鹽可舉出例如六氟銻酸鹽。鋁螯合物可舉出例如:乙醯基乙酸乙酯二異丙醇鋁及參(乙醯基乙酸乙酯)鋁。三氟化硼胺錯合物可舉出例如:三氟化硼單乙胺錯合物、三氟化硼咪唑錯合物及三氟化硼哌啶錯合物。
上述之熱自由基聚合起始劑可舉出例如偶氮化合物和過氧化物等類型之熱自由基聚合起始劑。偶氮化合物可舉出例如:2,2'-偶氮雙異丁腈、2,2'-偶氮雙(2,4-二甲基戊腈)、2,2'-偶氮雙(4-甲氧基-2,4-二甲基戊腈)、二甲基-2,2'-偶氮雙(2-甲基丙酸酯)、2,2'-偶氮雙(異丁酸)二甲酯、二乙基-2,2'-偶氮雙(2-甲基丙酸酯)及二丁基-2,2'-偶氮雙(2-甲基丙酸酯)。過氧化物可舉出例如:過氧化苯甲醯、過氧化第三丁基-2-乙基己酸酯、2,5-二甲基-2,5-二(2-乙基己醯基)過氧化己烷、過氧化第三丁基苯甲酸酯、第三丁基過氧化物、異丙苯基過氧化氫、二異丙苯基過氧化物、二 -第三丁基過氧化物、2,5-二甲基-2,5-二丁基過氧化己烷、過氧化2,4-二氯苯甲醯、1,4-二(2-過氧化第三丁基異丙基)苯、1,1-雙(過氧化第三丁基)-3,3,5-三甲基環己烷、甲基乙基酮過氧化物及1,1,3,3-過氧化四甲基丁基-2-乙基己酸酯。
接著劑層30形成用組成物除了含有上述之含有聚合性基的聚有機倍半矽氧烷以外,亦可含有一種或二種以上之其它的硬化性化合物。該硬化性化合物可舉出例如:上述之含有聚合性基的聚有機倍半矽氧烷以外的環氧化合物、含有(甲基)丙烯醯氧基之化合物、含有乙烯基之化合物、氧雜環丁烷化合物及乙烯基醚化合物。
上述之含有聚合性基的聚有機倍半矽氧烷以外之環氧化合物可舉出例如:脂環式環氧化合物(脂環式環氧樹脂)、芳香族環氧化合物(芳香族環氧樹脂)及脂肪族環氧化合物(脂肪族環氧樹脂)。脂環式環氧化合物可舉出例如:3,4,3',4'-二環氧基聯環己烷、2,2-雙(3,4-環氧基環己基)丙烷、1,2-雙(3,4-環氧基環己基)乙烷、2,3-雙(3,4-環氧基環己基)氧雜環丙烷、雙(3,4-環氧基環己基甲基)醚及2,2-雙(羥基甲基)-1-丁醇之1,2-環氧-4-(2-氧雜環丙烷基)環己烷加成物(例如大賽璐股份有限公司之商品名「EHPE3150」)。
上述芳香族環氧化合物可舉出例如:表雙式(epi-bis type)縮水甘油醚型環氧樹脂和酚醛清漆/烷基式縮水甘油醚型環氧樹脂。
上述脂肪族環氧化合物可舉出例如:不具有環狀構造之q價的醇(q為自然數)之縮水甘油醚、一元羧酸或多元羧酸之縮水甘油基酯 及具有雙鍵之油脂的環氧化物。具有雙鍵之油脂的環氧化物可舉出例如:環氧化亞麻仁油、環氧化大豆油及環氧化蓖麻油。
上述之含有(甲基)丙烯醯氧基的化合物可舉出例如:三羥甲基丙烷三(甲基)丙烯酸酯、二(三羥甲基丙烷)四(甲基)丙烯酸酯、新戊四醇三(甲基)丙烯酸酯、新戊四醇四(甲基)丙烯酸酯、二新戊四醇五(甲基)丙烯酸酯、二新戊四醇六(甲基)丙烯酸酯、甘油三(甲基)丙烯酸酯、參(2-羥基乙基)異氰酸酯三(甲基)丙烯酸酯、乙二醇二(甲基)丙烯酸酯、1,3-丁二醇二(甲基)丙烯酸酯、1,4-丁二醇二(甲基)丙烯酸酯、1,6-己二醇二(甲基)丙烯酸酯、新戊二醇二(甲基)丙烯酸酯、二乙二醇二(甲基)丙烯酸酯、三乙二醇二(甲基)丙烯酸酯、二丙二醇二(甲基)丙烯酸酯、雙(2-羥基乙基)異氰酸酯二(甲基)丙烯酸酯、二環戊烯基二丙烯酸酯、環氧丙烯酸酯、胺酯丙烯酸酯、不飽和聚酯、聚酯丙烯酸酯、聚醚丙烯酸酯、乙烯基丙烯酸酯、聚矽氧丙烯酸酯及甲基丙烯酸聚苯乙烯基乙酯。又,上述之含有(甲基)丙烯醯氧基的化合物亦可舉出:Nagase chemtex股份有限公司製之「DA-141」、東亞合成股份有限公司製之「Aronix M-211B」及「Aronix M-208」、以及新中村化學股份有限公司製之「NK-ESTER」、「ABE-300」、「A-BPE-4」、「A-BPE-10」、「A-BPE-20」、「A-BPE-30」、「BPE-100」、「BPE-200」、「BPE-500」、「BPE-900」及「BPE-1300N」。
上述含有乙烯基之化合物可舉出例如:苯乙烯及二乙烯基苯。
上述之氧雜環丁烷化合物可舉出例如:3,3-雙(乙烯基氧甲基)氧雜環丁烷、3-乙基-3-(羥基甲基)氧雜環丁烷、3-乙基-3-(2-乙基己氧基甲基)氧雜環丁烷、3-乙基-3-(羥基甲基)氧雜環丁烷、3-乙基-3-[(苯氧基)甲基]氧雜環丁烷、3-乙基-3-(己氧基甲基)氧雜環丁烷、3-乙基-3-(氯甲基)氧雜環丁烷及3,3-雙(氯甲基)氧雜環丁烷。
上述之乙烯基醚化合物可舉出例如:2-羥基乙基乙烯基醚、3-羥基丙基乙烯基醚、2-羥基丙基乙烯基醚、2-羥基異丙基乙烯基醚、4-羥基丁基乙烯基醚、3-羥基丁基乙烯基醚、2-羥基丁基乙烯基醚、3-羥基異丁基乙烯基醚、2-羥基異丁基乙烯基醚、1-甲基-3-羥基丙基乙烯基醚、1-甲基-2-羥基丙基乙烯基醚、1-羥基甲基丙基乙烯基醚、4-羥基環己基乙烯基醚、1,6-己二醇單乙烯基醚、1,6-己二醇二乙烯基醚、1,8-辛二醇二乙烯基醚、對苯二甲醇單乙烯基醚、對苯二甲醇二乙烯基醚、間苯二甲醇單乙烯基醚、間苯二甲醇二乙烯基醚、鄰苯二甲醇單乙烯基醚、鄰苯二甲醇二乙烯基醚、二乙二醇單乙烯基醚、二乙二醇二乙烯基醚、三乙二醇單乙烯基醚及三乙二醇二乙烯基醚。
接著劑層30形成用組成物就調整其塗佈性等而言,係以含有溶劑為較佳。溶劑可舉出例如:丙二醇單甲基醚乙酸酯、甲基乙酮、甲基異丁酮、環己酮、甲苯、二甲苯、乙酸乙酯、乙酸丁酯、乙酸3-甲氧基丁酯、乙酸甲氧基丙酯、乙二醇單甲基醚乙酸酯、甲醇、乙醇、異丙醇、1-丁醇、1-甲氧基-2-丙醇、3-甲氧基丁醇、乙氧基乙醇、二異丙基醚、乙二醇二甲基醚及四氫呋喃。
接著劑層30形成用組成物可更含有矽烷偶合劑、消泡劑、抗氧化劑、抗結塊劑、調平劑、界面活性劑、增量劑、防鏽劑、抗靜電劑、塑化劑等各種添加劑。
接著劑層30或矽氧烷系有機無機混成接著劑中,碳比例較佳係20至70質量%,更佳係30至70質量%,再更佳係40至60質量%;氫比例較佳係2至20質量%,更佳係3至15質量%,再更佳係4至10質量%;氧比例較佳係10至40質量%,更佳係15至35質量%,再更佳係20至30質量%;矽比例較佳係3至40質量%,更佳係5至30質量%,再更佳係10至20質量%。如此之構成除了適於實現所形成之接著劑層30的高耐熱性及抑制硬化時收縮以外,還適於在所形成之接著劑層30中將其厚度設定為例如5μm以下時仍顯現充分之晶圓接合強度。上述各元素之比例可藉由例如CHN元素分析和Si定量分析(重量法)、ICP發光分析、X射線光電子分光分析等來進行鑑定。
使用如以上之接著劑層30形成用組成物的上述晶圓接合中,係例如首先在接合對象面之一個晶圓的表面藉由旋轉塗佈而塗佈接著劑層30形成用組成物以形成接著劑組成物層,藉由加熱而使該組成物層乾燥並固化。此時之加熱溫度係例如為50至150℃,加熱時間係例如為5至120分鐘。其次,隔著形成於一晶圓上之接著劑組成物層而將二個晶圓加壓並貼合之後,藉由對接著劑組成物層加熱而使其硬化。在貼合中,加壓力係例如為300至5000g/cm2,溫度係例如為30至200℃。硬化用之加熱溫度例如為100至300℃,加熱時間例如為5至120分鐘。接著劑層30形成用組成物係含有包含聚合性基之聚有機倍半矽氧烷來作為硬化 性樹脂時,該接著劑組成物較佳係在上述貼合前以室溫以上且80℃以下之溫度加熱,且於貼合之後以100至200℃之溫度被硬化。
如此方式所形成之接著劑層30的厚度較佳係5μm以下,更佳係4μm以下,再更佳係3μm以下。接著劑層30之厚度係例如0.5μm以上。
本半導體裝置製造方法中,繼而係如第1(b)圖所示,在晶圓20之主面20a上形成絕緣膜21。絕緣膜21係被覆晶圓20之主面20a,同時具有預定之圖案形狀的凹部。該凹部係如後述般會形成配線圖案。
絕緣膜21係例如可以下述方式形成。首先,藉由熱氧化法或CVD法,於晶圓20之主面20a上形成絕緣材料膜。絕緣材料膜可舉出矽氧化膜或矽氮化膜。然後,藉由蝕刻(lithography)技術而在該絕緣材料膜上形成預定之阻劑圖案。然後,藉由利用該阻劑圖案作為蝕刻遮罩而進行之對於該絕緣材料膜的蝕刻處理,使該絕緣材料膜圖案化。蝕刻處理係例如以溼式蝕刻進行。其後,除去阻劑圖案。例如可以如上所述方式來形成具有預定之圖案形狀凹部的絕緣膜21。
在本半導體裝置製造方法中,繼而係如第1(c)圖所示般,在晶圓積層體W中形成作為貫通孔之孔洞H(孔洞形成步驟)。具體而言,首先係於絕緣膜21上形成作為蝕刻遮罩之阻劑圖案。該阻劑圖案係在對應於晶圓積層體W中之孔洞形成處之處具有孔洞形成用之開口部者。然後,在晶圓積層體W中,藉由源自隔著蝕刻遮罩之該阻劑圖案而由晶圓20側開始之蝕刻處理,形成貫通晶圓20及接著劑層30且到達晶 圓10中之配線圖案12b的孔洞H。該蝕刻處理係進行反應性離子蝕刻。對於晶圓20之蝕刻處理較佳為以波希法(Bosch process)進行反應性離子蝕刻,該蝕刻氣體較佳係採用含有SiF6與Ar之混合氣體。之後對於接著劑層30的蝕刻處理之蝕刻氣體較佳係採用含有CHF3、CF4、O2及Ar之混合氣體。又,在配線圖案12b中面對孔洞H之部分係構成孔洞H之底面。
本半導體裝置製造方法中,繼而如第2(a)圖所示,係於晶圓積層體W之孔洞H的內面保形(conformal)地形成絕緣膜41。絕緣膜41係例如矽氧化膜,例如為藉由CVD法而形成。
繼而,如第2(b)圖所示,蝕刻除去絕緣膜41中之孔洞H底面上的部分。具體而言,係藉由例如反應性離子蝕刻而除去孔洞H內之絕緣膜41中之配線圖案12b上的部分。該反應性離子蝕刻中之蝕刻氣體較佳係採用含有CHF3、CF4及Ar之混合氣體。
在本半導體裝置製造方法中,繼而係將形成有孔洞H之晶圓積層體W付諸洗淨處理(洗淨步驟)。本步驟之洗淨處理係包含氧電漿洗淨處理及/或氬濺鍍洗淨處理。本步驟中,較佳係進行氧電漿洗淨處理,之後再進行氬濺鍍洗淨處理。又,本步驟中亦可進行硫酸洗淨處理。硫酸洗淨處理較佳係在氧電漿洗淨處理與其後之氬濺鍍洗淨處理之間進行。
在洗淨步驟中進行氧電漿洗淨處理時,其處理時間較佳係5至120秒,更佳係10至60秒,再更佳係15至40秒。洗淨步驟中進行氬濺鍍洗淨處理時,其處理時間較佳係0.5至5分鐘,更佳係2至4分 鐘。在洗淨步驟中進行硫酸洗淨處理時,其處理時間較佳係10至100秒,更佳係20至90秒。使用於硫酸洗淨處理之硫酸的濃度係例如為1至3質量%。
其次,在孔洞H之壁面保形地形成阻隔層(省略圖示)之後,如第3(a)圖所示般進行導電材料50之堆積。阻隔層形成材料可舉出例如Ta。導電材料50在本實施形態中係採用Cu。導電材料50之堆積方法係可採用電鍍法。採用電鍍法時,係在上述阻隔層形成之後,例如藉由濺鍍成膜法而在孔洞H內保形地形成電鍍用之晶種層(seed layer)。晶種層形成材料可舉出例如Cu。在電鍍法中,係使Cu在該晶種層上成長。
然後,如第3(b)圖所示般除去導電材料50之過剩堆積部分。除去手法可舉出例如化學機械研磨(Chemical Mechanical Polishing,CMP)。藉由如此之除去,在晶圓積層體W之孔洞H內形成導電部51,且在絕緣膜21之凹部內形成配線圖案52。導電部51之直徑在本實施形態中例如為5至20μm。配線圖案52係形成於晶圓20上之再配線層的要件,且與在晶圓20之主面20a側作成內嵌之預定半導體元件為電性連接。導電部51對於晶圓10之電路形成面10a中之配線圖案12b為構造性連接且電性連接,同時對於配線圖案52為構造性連接且電性連接。如此之導電部51係在所製造之半導體裝置中,係構成為用以使源自晶圓10之半導體元件與源自晶圓20之半導體元件之間電性連接的貫通電極。
之後,依照製造目的之半導體裝置的半導體元件積層數,進行預定次數之包括「從在主面20a上隔著對形成有再配線層之晶圓20上的接著劑層30之進一步積層晶圓20開始,至導電部51之形成為止」的一連串過程。
本半導體裝置製造方法中,晶圓10亦可藉由從其背面10b側開始之磨削加工而薄化。該薄化後之晶圓10的厚度,係例如為10至400μm。又,於最後所積層之晶圓20的再配線層上,亦可形成外部連接用凸塊。或者,亦可貫通薄化後之晶圓10而形成與晶圓10之電路形成面10a側的再配線層內之預定配線圖案電性連接之貫通電極,使於晶圓10之背面10b側形成與該貫通電極電性連接之外部連接用凸塊。
以上述方式,可製造半導體裝置,該半導體裝置具有半導體元件在其厚度方向集成之立體構造。此半導體裝置係亦可藉由切割而單件化。
本半導體裝置製造方法係如上述,會成為用以電性連接半導體元件間之貫通電極的導電部51係對於晶圓10之電路形成面10a的配線圖案12b為構造性連接且電性連接。如此之無凸塊構造就在多層化之半導體元件間實現短的導電路徑而言為適宜。習知形式之WOW製程於與貫通晶圓之貫通電極電性連接之凸塊電極形成於該晶圓表面之情形下,係有能夠經由該凸塊電極而謀求半導體元件間之電性連接的情形。相對於此,於本半導體裝置製造方法中,係會成為貫通電極之導電部51係直接連接晶圓10中之配線圖案12b,在半導體元件間之電性連接中形成無凸塊構造者。如此之無凸塊構造就在經多層化之半導體元件間實現短的導電路徑 而言為適宜,經多層化之半導體元件間的導電路徑愈短,則該元件間之導電路徑乃至配線的電阻有變得愈小之傾向。
此外,本半導體裝置製造方法係經過隔著接著劑層30之半導體晶圓的積層而將半導體元件多層化之方法,且將晶圓間接合之接著劑層30係含有SiOC系聚合物作為接著劑。而且,本方法中,形成有貫通晶圓20及接著劑層30之孔洞H的晶圓積層體W,係在洗淨步驟中付諸於包含氧電漿洗淨處理及/或氬濺鍍洗淨處理之洗淨處理。本發明之見識為:此等構成就在形成於孔洞H內之導電部51乃至貫通電極、與晶圓10中之配線圖案12b之間能實現低的接觸電阻而言為適宜。例如後述之實施例及比較例所示。孔洞H內之導電部51乃至貫通電極與晶圓10中之配線圖案12b之間的接觸電阻愈小,則在所製造之半導體裝置中,隔著該貫通電極而電性連接之半導體元件間的導電路徑整體乃至配線整體之電阻係有變小之傾向。
如以上所述,本半導體裝置製造方法適於在所製造之半導體裝置中於多層化之半導體元件間實現低的配線電阻。如此之本半導體裝置製造方法在所製造之半導體裝置中,就抑制低消耗電力下之高速訊號傳遞而言係為適宜,又,就抑制高頻訊號之衰減而言為適宜。
本方法中之接著劑層30係如上述,較佳係含有具有聚合性基之聚有機倍半矽氧烷的接著劑組成物之硬化物。如此之接著劑層30係適於在實現高耐熱性的同時,謀求接著劑層30形成用之硬化溫度的降低而抑制對於作為被著體之晶圓內的元件之損傷。
本方法中之接著劑層30的厚度係如上述,較佳係5μm以下,更佳係4μm以下,又更佳係3μm以下。如此之構成適於謀求本方法中所形成之導電部51乃至貫通電極的縮短化,因此,適於減少隔著該貫通電極而電性連接之半導體元件間的導電路徑整體乃至配線整體之電阻。而且,含有矽氧烷系有機無機混成接著劑之接著劑層30即使在薄至前述程度時,亦適於充分地發揮晶圓接合強度。
此外,接著劑層30愈薄,則在參照第1(c)圖之經過上述的孔洞形成步驟和之後的洗淨步驟之各個階段中,容易降低孔洞H內之蝕刻殘渣。在孔洞H內之蝕刻殘渣的降低係有助於謀求上述接觸電阻的降低。
再者,接著劑層30愈薄,則在參照第1(c)圖的上述孔洞形成步驟中,愈容易抑制在接著劑層30之孔洞露出面產生底切(undercut)或側蝕(side etching),愈容易依照適當的形狀之孔洞H而形成導電部51。如此之構成係有助於抑制在所謂導電部51中產生漏電流。
本方法中之晶圓20的厚度係如上述般,為30μm以下,較佳係20μm以下,更佳係15μm以下。如此之構成係適於謀求本方法所形成之導電部51乃至貫通電極的縮短化,因此適於減少隔著該貫通電極而電性連接之半導體元件間的導電路徑整體乃至配線整體的電阻。
又,晶圓20或接著劑層30薄如上述一事,係有助於以本方法所製造之半導體裝置的小型化和高密度化。
以如下所述方式,在預定之晶圓積層體中形成總數71之貫通電極。
首先,準備於表面伴隨再配線層之第1矽晶圓(直徑300mm)及第2矽晶圓(直徑300mm)。第1矽晶圓之再配線層係包含Cu配線圖案,該Cu配線圖案具有露出於再配線層外之區域。其次,使用後述之接著劑組成物C將第1矽晶圓之再配線側與第2矽晶圓接合。具體而言,首先係將預定量之接著劑組成物C藉由旋轉塗佈而塗佈於一個晶圓的表面並形成接著劑組成物層,藉由加熱而使該組成物層乾燥並固化。此時,首先係在80℃進行加熱4分鐘,繼而在100℃進行加熱2分鐘。其次,隔著形成於一個晶圓上之接著劑組成物層而將二個晶圓加壓並貼合後,藉由加熱而使接著劑組成物層硬化。在貼合時,加壓力係例如為1000g/cm2,溫度為50℃。硬化時,首先係在135℃進行加熱30分鐘,繼而在170℃進行加熱30分鐘。將晶圓間接合之接著劑層的厚度係2.5μm。以如上所述方式,製作晶圓積層,該晶圓積層體具有包含第1矽晶圓及第2矽晶圓以及接合此等矽晶圓之接著劑層(厚度2.5μm)的積層構造。
其次,對晶圓積層體中之第2矽晶圓使用磨削裝置(商品名「DGP8761HC」,Disco股份有限公司製)而進行磨削加工,將第2矽晶圓薄化至厚度10μm。然後,藉由CVD法在第2矽晶圓之被磨削面上形 成矽氧化膜(絕緣膜)。繼而,在該絕緣膜中形成預定之圖案形狀的凹部。凹部係藉由對於該絕緣材料膜之蝕刻處理而形成,該蝕刻處理係在藉由蝕刻技術而於絕緣膜上形成預定之阻劑圖案後,利用該阻劑圖案作為蝕刻遮罩而進行。
其次,除去來自絕緣膜上之阻劑圖案後,在晶圓積層體形成孔洞(貫通孔)。具體而言,首先係於絕緣膜上形成作為蝕刻遮罩之阻劑圖案。該阻劑圖案係在對應於晶圓積層體中之孔洞形成處之處具有孔洞形成用之開口部者。再者,在晶圓積層體中,藉由隔著作為蝕刻遮罩之該阻劑圖案而從第2矽晶圓側開始進行之蝕刻處理,形成貫通第2矽晶圓(厚度10μm)及接著劑層(厚度2.5μm)且到達第1矽晶圓中之配線圖案的孔洞。此蝕刻處理中,首先係對第2矽晶圓進行第1蝕刻處理,之後對接著劑層進行第2蝕刻處理。在第1蝕刻處理係使用蝕刻裝置(商品名「Silivia」,Applied materials公司製),以波希法進行反應性離子蝕刻,使用SiF6與Ar之混合氣體作為蝕刻氣體。在第2蝕刻處理係使用蝕刻裝置(商品名「e-MAX」,Applied materials公司製)進行反應性離子蝕刻,並使用CHF3、CF4、O2及Ar之混合氣體作為蝕刻氣體。
其次,在晶圓積層體之孔洞的內面藉由CVD法而保形地形成矽氧化膜。然後,蝕刻除去該矽氧化膜中之孔洞底面上的部分。用於此之蝕刻處理係使用蝕刻裝置(商品名「e-MAX」,Applied materials公司製)進行反應性離子蝕刻,並使用CHF3、CF4及Ar之混合氣體作為蝕刻氣體。
再者,將晶圓積層體付諸洗淨處理。具體而言,係對於形成有孔洞之晶圓積層體進行氧電漿洗淨處理,其後進行硫酸洗淨處理。氧電漿洗淨處理係使用電漿裝置(商品名「e-MAX」,Applied materials公司製),並使用氧氣,且將溫度條件設為120℃,將電漿灰化(plasma ashing)(洗淨處理)時間設為15秒。硫酸洗淨處理係使用洗淨裝置(商品名「GPTC-1」),並使用2質量%硫酸,將洗淨處理時間設為43秒。
其次,藉由CVD法而將Ta阻隔層(厚度80nm)保形地形成於經洗淨處理之孔洞的壁面,繼而藉由濺鍍成膜法而保形地形成電鍍用之Cu晶種層(厚度1μm)。然後,藉由電鍍法而使Cu堆積於涵蓋晶圓積層體中之孔洞內與第2矽晶圓上之絕緣膜所具有的凹部內。繼而,藉由CMP法除去第2矽晶圓上之Cu的過剩堆積部分。藉此,於晶圓積層體之孔洞內形成貫通電極,且於晶圓積層體之第2矽晶圓上的絕緣膜之凹部內形成配線圖案。
將以如後述方式所得之含有環氧基的聚有機倍半矽氧烷100質量份、丙二醇單甲基醚乙酸酯115質量份、銻系鋶鹽(商品名「SI-150L」,三新化學工業股份有限公司製)0.45質量份(固體成分)、(4-羥基苯基)二甲基鋶甲基硫醚(商品名「SAN-AID SI助劑」,三新化學工業股份有限公司製)0.05質量份混合,獲得接著劑組成物C。
在具備回流冷卻器、氮氣導入管、攪拌裝置及溫度計之300mL燒瓶內導入氮氣,同時將2-(3,4-環氧環己基)乙基三甲氧基矽烷161.5mmol(39.79g)、苯基三甲氧基矽烷9mmol(1.69g)、作為溶劑之丙酮165.9g進行混合並升溫至50℃。然後,於該混合物中以5分鐘滴入5%碳酸鉀水溶液4.7g(碳酸鉀1.7mmol),繼而以20分鐘滴入水1700mmol(30.6g)。滴入操作期間,混合物並未產生明顯的溫度上昇。該滴入操作之後,於燒瓶內導入氮氣,同時在50℃進行聚縮合反應4小時。分析聚縮合反應後之反應溶液中的生成物,數量平均分子量為1900,分子量分散度為1.5。繼而,對於經靜置而冷卻之反應溶液重複進行水洗,直到因相分離而產生之下層液(水相)變成中性後,分取上層液,在1mmHg及40℃之條件下從上層液餾去溶劑,直到溶劑量成為25質量%為止,獲得無色透明的液狀之生成物(含有環氧基之聚有機倍半矽氧烷)。
除了在洗淨步驟中係不進行氧電漿洗淨處理,及在硫酸洗淨處理後係進行氬濺鍍洗淨處理以外,其餘係與實施例1之製程相同的方式,對於上述之晶圓積層體進行實施例2之製程。實施例2中之氬濺鍍洗淨處理係使用濺鍍裝置(商品名「Producer」,Applied materials公司製),並將Ar濺鍍(洗淨處理)時間設為3分鐘。
除了在洗淨步驟中,在硫酸洗淨處理後係進行氬濺鍍洗淨處理以外,其餘係與實施例1之製程相同的方式,對上述之晶圓積層體進行實施例3之製程。實施例3中之氬濺鍍洗淨處理係使用濺鍍裝置(商品名「Producer」,Applied materials公司製),並將Ar濺鍍(洗淨處理)時間設為3分鐘。
除了在洗淨步驟中,係將硫酸洗淨處理時間設為43秒至86秒,以及在硫酸洗淨處理後係進行氬濺鍍洗淨處理以外,其餘係與實施例1之製程相同的方式,對於上述之晶圓積層體進行實施例4之製程。實施例4中之氬濺鍍洗淨處理係使用濺鍍裝置(商品名「Producer」,Applied materials公司製),並將Ar濺鍍(洗淨處理)時間設為3分鐘。
除了在洗淨步驟中,係不進行氧電漿洗淨處理以外,其餘係與實施例1之製程相同的方式,對於上述之晶圓積層體進行比較例1之製程。
對於實施例1至4及比較例1之各晶圓積層體,測定所形成之總數為71的貫通電極之鏈電阻(菊鏈(daisy chain)電阻)的值。將其測定結果表示於第4圖至第7圖。第4圖係表示實施例1及比較例1之各鏈電阻測定結果的圖表。第5圖係表示實施例2及比較例1之各鏈電阻測定結果的圖 表。第6圖係表示實施例1、實施例3及比較例1之各鏈電阻測定結果的圖表。第7圖係表示實施例3、實施例4及比較例1之各鏈電阻測定結果的圖表。在各圖表中,橫軸係表示電阻之值(Ω),縱軸係表示累計機率(%)。又,圖表中之各作圖係表示預定之一貫通電極的接觸電阻(第1矽晶圓之配線圖案與其上之貫通電極的接觸電阻)者。
在上述之電阻值測定中,藉由實施例1至4之方法所形成之貫通電極的99%之測定點的接觸電阻係700Ω以下(實施例1)、450Ω以下(實施例2)、150Ω以下(實施例3)及250Ω以下(實施例4)。從第4圖至第7圖所示之圖表可判斷:實施例1至4之方法所形成之貫通電極的接觸電阻值係較比較例1之方法所形成之貫通電極的接觸電阻值更為大幅地降低,或是不均勻被大幅地抑制。
作為以上之彙整,本發明之構成及其變形係記載於以下。
[1]一種半導體裝置製造方法,係包含下述步驟:第1步驟,準備具有積層構造之晶圓積層體,該積層構造係包含:第1晶圓,係具有包含配線圖案之電路形成面;第2晶圓,係具有主面及與主面相反之背面;及接著劑層,係含有SiOC系聚合物,且間隔存在於前述第1晶圓之前述電路形成面與前述第2晶圓之前述背面之間;第2步驟,係在前述晶圓積層體中,藉由隔著遮蔽前述第2晶圓之前述主面側的一部分之遮蔽圖案而從該第2晶圓側開始進行之蝕刻處理,使 形成貫通該第2晶圓及前述接著劑層且到達前述第1晶圓之前述配線圖案的孔洞;第3步驟,係在前述孔洞之內面形成絕緣膜;第4步驟,係將前述孔洞內之前述絕緣膜的前述配線圖案上之部分進行蝕刻除去;第5步驟,係將經過前述第4步驟之前述晶圓積層體付諸包含氧電漿洗淨處理及/或氬濺鍍洗淨處理之洗淨處理;第6步驟,係藉由於經過前述洗淨步驟之前述孔洞內填充導電材料而形成導電部。
[2]如[1]項所述之半導體裝置製造方法,其中,前述SiOC系聚合物中之碳比例為20至70質量%、30至70質量%、或40至60質量%,氫比例為2至20質量%、3至15質量%、或4至10質量%,氧比例為10至40質量%、15至35質量%、或20至30質量%,矽比例為3至40質量%、5至30質量%、或10至20質量%。
[3]如[1]或[2]項所述之半導體裝置製造方法,其中,蝕刻處理為反應性離子蝕刻。
[4]如[1]至[3]項中任一項所述之半導體裝置製造方法,其中,前述洗淨處理係包含氧電漿洗淨處理及在氧電漿洗淨處理後之氬濺鍍洗淨處理。
[5]如[1]或[4]項所述之半導體裝置製造方法,其中,前述氧電漿洗淨處理之處理時間為5至120秒、10至60秒、或15至40秒。
[6]如[1]至[5]項中任一項所述之半導體裝置製造方法,其中,前述氬濺鍍洗淨處理之處理時間為0.5至5分鐘、或2至4分鐘。
[7]如[1]至[6]項中任一項所述之半導體裝置製造方法,其中,前述洗淨處理包含硫酸洗淨處理,該硫酸洗淨處理係於氧電漿洗淨處理及氬濺鍍洗淨處理之間。
[8]如[7]項所述之半導體裝置製造方法,其中,前述硫酸洗淨處理之處理時間為10至100秒或20至90秒。
[9]如[1]至[8]項中任一項所述之半導體裝置製造方法,其中,第6步驟中之導電材料的填充方法為電鍍法。
[10]如[1]至[9]項中任一項所述之半導體裝置製造方法,其中,前述接著劑層係接著劑組成物的硬化物,該接著劑組成物包含矽氧烷系有機無機混成接著劑。
[11]如[1]至[10]項中任一項所述之半導體裝置製造方法,其中,前述接著劑層係接著劑組成物之硬化物,該接著劑組成物包含具有聚合性基之聚有機倍半矽氧烷。
[12]如[11]項所述之半導體裝置製造方法,其中,前述接著劑組成物中之含有前述聚合性基的聚有機倍半矽氧烷的含有比例為70質量%以上、80至99.8質量%、或90至99.5質量%。
[13]如[11]或[12]項所述之半導體裝置製造方法,其中,前述含有聚合性基之聚有機倍半矽氧烷係就矽氧烷構成單元而言,包含:至少含有下述式(1)所示之構成單元的第1構成單元[RSiO3/2]、及至少含有下述式(2) 所示之構成單元的第2構成單元[RSiO2/2(OR')](第2構成單元中之R與R'係可為相同,亦可為相異)。
[R1SiO3/2] (1)
[R1SiO2/2(OR2)] (2)(式(1)中之R1及式(2)中之R1係分別表示含有環氧基或(甲基)丙烯醯氧基之基。式(2)中之R2係表示氫原子或碳數1至4之烷基)。
[14]如[11]至[13]項中任一項所述之半導體裝置製造方法,其中,前述含有聚合性基之聚有機倍半矽氧烷的數量平均分子量(Mn)係1000至50000、1500至10000、2000至8000或2000至7000。
[15]如[11]至[14]項中任一項所述之半導體裝置製造方法,其中,對於前述含有聚合性基之聚有機倍半矽氧烷的分子量分散度(Mw/Mn)為1.0至4.0、1.1至3.0、或1.2至2.7。
[16]如[1]至[15]項中任一項所述之半導體裝置製造方法,其中,前述接著劑層之厚度為5μm以下、4μm以下、或3μm以下,且為0.5m以上。
[17]如[1]至[16]項中任一項所述之半導體裝置製造方法,其中,前述第2晶圓具有20μm以下或15μm以下之厚度。
若依據本發明之方法,可在隔著接著劑層而接合並多層化之半導體元件間實現低的配線電阻。
10、20‧‧‧晶圓
11‧‧‧本體部
12‧‧‧再配線層
12a‧‧‧絕緣部
12b‧‧‧配線圖案
21‧‧‧絕緣膜
30‧‧‧接著劑層
41‧‧‧絕緣膜
H‧‧‧孔洞
W‧‧‧晶圓積層體
Claims (8)
- 一種半導體裝置製造方法,係包含:第1步驟,係準備具有積層構造之晶圓積層體,該積層構造包含:第1晶圓,係具有包含配線圖案之電路形成面;第2晶圓,係具有主面及與主面相反之背面;及接著劑層,係含有SiOC系聚合物,且間隔存在於前述第1晶圓之前述電路形成面與前述第2晶圓之前述背面之間;第2步驟,係在前述晶圓積層體中,藉由隔著遮蔽前述第2晶圓之前述主面側的一部分之遮蔽圖案而從該第2晶圓側進行之蝕刻處理,以形成貫通該第2晶圓及前述接著劑層且到達前述第1晶圓之前述配線圖案的孔洞;第3步驟,係在前述孔洞之內面形成絕緣膜;第4步驟,係將前述孔洞內之前述絕緣膜的前述配線圖案上之部分進行蝕刻除去;第5步驟,係將經前述第4步驟之前述晶圓積層體付諸包含氧電漿洗淨處理及/或氬濺鍍洗淨處理之洗淨處理;第6步驟,藉由對經前述洗淨步驟之前述孔洞內填充導電材料而形成導電部。
- 如申請專利範圍第1項所述之半導體裝置製造方法,其中,前述洗淨處理係包含氧電漿洗淨處理及在氧電漿洗淨處理後之氬濺鍍洗淨處理。
- 如申請專利範圍第1或2項所述之半導體裝置製造方法,其中,前述氧電漿洗淨處理之處理時間為5至120秒。
- 如申請專利範圍第1至3項中任一項所述之半導體裝置製造方法,其中,前述氬濺鍍洗淨處理之處理時間為0.5至5分鐘。
- 如申請專利範圍第1至4項中任一項所述之半導體裝置製造方法,其中,前述洗淨處理係包含氧電漿洗淨處理及氬濺鍍洗淨處理之間的硫酸洗淨處理。
- 如申請專利範圍第1至5項中任一項所述之半導體裝置製造方法,其中,前述接著劑層係接著劑組成物之硬化物,該接著劑組成物包含含有聚合性基之聚有機倍半矽氧烷。
- 如申請專利範圍第1至6項中任一項所述之半導體裝置製造方法,其中,前述接著劑層具有5μm以下之厚度。
- 如申請專利範圍第1至7項中任一項所述之半導體裝置製造方法,其中,前述第2晶圓具有20μm以下之厚度。
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JP3200475B2 (ja) * | 1992-10-05 | 2001-08-20 | 三菱電機株式会社 | 半導体装置の製造方法 |
JPH10135328A (ja) * | 1996-10-30 | 1998-05-22 | Kawasaki Steel Corp | 半導体装置の配線形成方法 |
JPH1074891A (ja) * | 1997-08-07 | 1998-03-17 | Nec Corp | 半導体装置 |
US6399512B1 (en) * | 2000-06-15 | 2002-06-04 | Cypress Semiconductor Corporation | Method of making metallization and contact structures in an integrated circuit comprising an etch stop layer |
US6355563B1 (en) * | 2001-03-05 | 2002-03-12 | Chartered Semiconductor Manufacturing Ltd. | Versatile copper-wiring layout design with low-k dielectric integration |
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US6713402B2 (en) * | 2002-05-31 | 2004-03-30 | Texas Instruments Incorporated | Methods for polymer removal following etch-stop layer etch |
US7244683B2 (en) * | 2003-01-07 | 2007-07-17 | Applied Materials, Inc. | Integration of ALD/CVD barriers with porous low k materials |
US7207339B2 (en) * | 2003-12-17 | 2007-04-24 | Taiwan Semiconductor Manufacturing Co., Ltd. | Method for cleaning a plasma enhanced CVD chamber |
US7453150B1 (en) * | 2004-04-01 | 2008-11-18 | Rensselaer Polytechnic Institute | Three-dimensional face-to-face integration assembly |
JP2009194017A (ja) * | 2008-02-12 | 2009-08-27 | Elpida Memory Inc | 半導体装置の製造方法 |
TWI405321B (zh) * | 2009-09-08 | 2013-08-11 | Ind Tech Res Inst | 三維多層堆疊半導體結構及其製造方法 |
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WO2013184880A1 (en) * | 2012-06-07 | 2013-12-12 | Rensselaer Polytechnic Institute | Use of conformal coating elastic cushion to reduce through silicon vias (tsv) stress in 3-dimensional integration |
US9269562B2 (en) | 2013-01-17 | 2016-02-23 | Applied Materials, Inc. | In situ chamber clean with inert hydrogen helium mixture during wafer process |
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US9299640B2 (en) | 2013-07-16 | 2016-03-29 | Taiwan Semiconductor Manufacturing Co., Ltd. | Front-to-back bonding with through-substrate via (TSV) |
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